AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/07/15 13:30	flow	patch-triage	0m Args: null Results: { "EnableConfigs": [ "BPF_JIT", "BPF_SYSCALL" ], "FocusSymbols": [ "bpf_jit_emit_insn", "bpf_jit_supports_timed_may_goto", "arch_bpf_timed_may_goto" ], "Reasoning": "The patch adds support for the `bpf_timed_may_goto` instruction in the RISC-V 64-bit BPF JIT compiler. It modifies the JIT instruction emitter and adds a new assembly trampoline, which are functional changes that can be reached by loading specific BPF programs.", "WorthFuzzing": true }
1/1	2026/07/15 13:30	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit a69d4334958a7afe53c22aac0a23b91b64e6fa7e\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Wed Jul 15 13:30:28 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/arch/riscv/net/Makefile b/arch/riscv/net/Makefile\nindex 9a1e5f0a94e559..6458d4d51990a7 100644\n--- a/arch/riscv/net/Makefile\n+++ b/arch/riscv/net/Makefile\n@@ -3,7 +3,7 @@\n obj-$(CONFIG_BPF_JIT) += bpf_jit_core.o\n \n ifeq ($(CONFIG_ARCH_RV64I),y)\n-\tobj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o\n+\tobj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o bpf_timed_may_goto.o\n else\n \tobj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o\n endif\ndiff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c\nindex c03c1de16b79ac..4f88a446278ae8 100644\n--- a/arch/riscv/net/bpf_jit_comp64.c\n+++ b/arch/riscv/net/bpf_jit_comp64.c\n@@ -1841,7 +1841,13 @@ int bpf_jit_emit_insn(const struct bpf_insn insn, struct rv_jit_context ctx,\n \t\tif (ret)\n \t\t\treturn ret;\n \n-\t\tif (insn-\u003esrc_reg != BPF_PSEUDO_CALL)\n+\t\t/\n+\t\t arch_bpf_timed_may_goto() is emitted by the verifier and\n+\t\t * returns its result in BPF_REG_AX instead of BPF_REG_0, so\n+\t\t * skip the normal \"move return register into R0\".\n+\t\t /\n+\t\tif (insn-\u003esrc_reg != BPF_PSEUDO_CALL \u0026\u0026\n+\t\t addr != (u64)arch_bpf_timed_may_goto)\n \t\t\temit_mv(bpf_to_rv_reg(BPF_REG_0, ctx), RV_REG_A0, ctx);\n \t\tbreak;\n \t}\n@@ -2157,3 +2163,8 @@ bool bpf_jit_supports_fsession(void)\n {\n \treturn true;\n }\n+\n+bool bpf_jit_supports_timed_may_goto(void)\n+{\n+\treturn true;\n+}\ndiff --git a/arch/riscv/net/bpf_timed_may_goto.S b/arch/riscv/net/bpf_timed_may_goto.S\nnew file mode 100644\nindex 00000000000000..f4bf2cd105866b\n--- /dev/null\n+++ b/arch/riscv/net/bpf_timed_may_goto.S\n@@ -0,0 +1,47 @@\n+/ SPDX-License-Identifier: GPL-2.0 /\n+/ Copyright (c) 2026 Feng Jiang \u003cjiangfeng@kylinos.cn\u003e /\n+\n+#include \u003clinux/linkage.h\u003e\n+#include \u003casm/asm.h\u003e\n+\n+/\n+ * Trampoline for the BPF timed may_goto loop bound. Custom calling convention:\n+ \t- input: stack offset in BPF_REG_AX (t0)\n+ \t- output: updated count in BPF_REG_AX (t0)\n+ \n+ Calls bpf_check_timed_may_goto(ptr) with the standard RISC-V ABI, where\n+ * ptr = BPF_REG_FP (s5) + BPF_REG_AX (t0). BPF R0-R5 (a5, a0-a4) are saved\n+ * across the call; BPF_REG_FP (s5) is callee-saved and needs no saving.\n+ /\n+\n+SYM_FUNC_START(arch_bpf_timed_may_goto)\n+\taddi\tsp, sp, -64\n+\tsd\tra, 56(sp)\n+\tsd\ts0, 48(sp)\n+\taddi\ts0, sp, 64\n+\n+\t/ Save BPF registers R0-R5 (a5, a0-a4) /\n+\tsd\ta5, 40(sp)\n+\tsd\ta0, 32(sp)\n+\tsd\ta1, 24(sp)\n+\tsd\ta2, 16(sp)\n+\tsd\ta3, 8(sp)\n+\tsd\ta4, 0(sp)\n+\n+\tadd\ta0, t0, s5\n+\tcall\tbpf_check_timed_may_goto\n+\tmv\tt0, a0\n+\n+\t/ Restore BPF registers R0-R5 /\n+\tld\ta4, 0(sp)\n+\tld\ta3, 8(sp)\n+\tld\ta2, 16(sp)\n+\tld\ta1, 24(sp)\n+\tld\ta0, 32(sp)\n+\tld\ta5, 40(sp)\n+\n+\tld\ts0, 48(sp)\n+\tld\tra, 56(sp)\n+\taddi\tsp, sp, 64\n+\tret\n+SYM_FUNC_END(arch_bpf_timed_may_goto)\ndiff --git a/tools/testing/selftests/bpf/progs/stream.c b/tools/testing/selftests/bpf/progs/stream.c\nindex 92ba1d72e0ece4..8d8e53d37266cd 100644\n--- a/tools/testing/selftests/bpf/progs/stream.c\n+++ b/tools/testing/selftests/bpf/progs/stream.c\n@@ -64,6 +64,7 @@ SEC(\"syscall\")\n __arch_x86_64\n __arch_arm64\n __arch_s390x\n+__arch_riscv64\n __success __retval(0)\n __stderr(\"ERROR: Timeout detected for may_goto instruction\")\n __stderr(\"CPU: {{[0-9]+}} UID: 0 PID: {{[0-9]+}} Comm: {{.}}\")\ndiff --git a/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c b/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c\nindex 8d7ff38e4c0697..e6671c54e53ada 100644\n--- a/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c\n+++ b/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c\n@@ -660,6 +660,7 @@ __naked void may_goto_interaction_x86_64(void)\n \n SEC(\"raw_tp\")\n __arch_arm64\n+__arch_riscv64\n __log_level(4) __msg(\"stack depth 24\")\n /* may_goto counter at -24 /\n __xlated(\"0: (u64 )(r10 -24) =\")\ndiff --git a/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c b/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c\nindex 4bdf4256a41e51..f47b9d540a1759 100644\n--- a/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c\n+++ b/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c\n@@ -11,6 +11,7 @@ __description(\"may_goto 0\")\n __arch_x86_64\n __arch_s390x\n __arch_arm64\n+__arch_riscv64\n __xlated(\"0: r0 = 1\")\n __xlated(\"1: exit\")\n __success\n@@ -31,6 +32,7 @@ __description(\"batch 2 of may_goto 0\")\n __arch_x86_64\n __arch_s390x\n __arch_arm64\n+__arch_riscv64\n __xlated(\"0: r0 = 1\")\n __xlated(\"1: exit\")\n __success\n@@ -53,6 +55,7 @@ __description(\"may_goto batch with offsets 2/1/0\")\n __arch_x86_64\n __arch_s390x\n __arch_arm64\n+__arch_riscv64\n __xlated(\"0: r0 = 1\")\n __xlated(\"1: exit\")\n __success\n@@ -79,6 +82,7 @@ __description(\"may_goto batch with offsets 2/0\")\n __arch_x86_64\n __arch_s390x\n __arch_arm64\n+__arch_riscv64\n __xlated(\"0: (u64 )(r10 -16) = 65535\")\n __xlated(\"1: (u64 )(r10 -8) = 0\")\n __xlated(\"2: r12 = (u64 *)(r10 -16)\")\n" }
2/1	2026/07/15 13:30	agent	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: { "EnableConfigs": [ "BPF_JIT", "BPF_SYSCALL" ], "FocusSymbols": [ "bpf_jit_emit_insn", "bpf_jit_supports_timed_may_goto", "arch_bpf_timed_may_goto" ], "Reasoning": "The patch adds support for the `bpf_timed_may_goto` instruction in the RISC-V 64-bit BPF JIT compiler. It modifies the JIT instruction emitter and adds a new assembly trampoline, which are functional changes that can be reached by loading specific BPF programs.", "WorthFuzzing": true } Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Do not list too generic configs (we already have them enabled). Only list those that specifically cover the modified code. List them in the EnableConfigs output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: For your convenience, here is the diff of the changes: commit a69d4334958a7afe53c22aac0a23b91b64e6fa7e Author: syz-cluster <triage@syzkaller.com> Date: Wed Jul 15 13:30:28 2026 +0000 syz-cluster: applied patch under review diff --git a/arch/riscv/net/Makefile b/arch/riscv/net/Makefile index 9a1e5f0a94e559..6458d4d51990a7 100644 --- a/arch/riscv/net/Makefile +++ b/arch/riscv/net/Makefile @@ -3,7 +3,7 @@ obj-$(CONFIG_BPF_JIT) += bpf_jit_core.o ifeq ($(CONFIG_ARCH_RV64I),y) - obj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o + obj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o bpf_timed_may_goto.o else obj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o endif diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c index c03c1de16b79ac..4f88a446278ae8 100644 --- a/arch/riscv/net/bpf_jit_comp64.c +++ b/arch/riscv/net/bpf_jit_comp64.c @@ -1841,7 +1841,13 @@ int bpf_jit_emit_insn(const struct bpf_insn insn, struct rv_jit_context ctx, if (ret) return ret; - if (insn->src_reg != BPF_PSEUDO_CALL) + /* + * arch_bpf_timed_may_goto() is emitted by the verifier and + * returns its result in BPF_REG_AX instead of BPF_REG_0, so + * skip the normal "move return register into R0". + / + if (insn->src_reg != BPF_PSEUDO_CALL && + addr != (u64)arch_bpf_timed_may_goto) emit_mv(bpf_to_rv_reg(BPF_REG_0, ctx), RV_REG_A0, ctx); break; } @@ -2157,3 +2163,8 @@ bool bpf_jit_supports_fsession(void) { return true; } + +bool bpf_jit_supports_timed_may_goto(void) +{ + return true; +} diff --git a/arch/riscv/net/bpf_timed_may_goto.S b/arch/riscv/net/bpf_timed_may_goto.S new file mode 100644 index 00000000000000..f4bf2cd105866b --- /dev/null +++ b/arch/riscv/net/bpf_timed_may_goto.S @@ -0,0 +1,47 @@ +/ SPDX-License-Identifier: GPL-2.0 / +/ Copyright (c) 2026 Feng Jiang <jiangfeng@kylinos.cn> / + +#include <linux/linkage.h> +#include <asm/asm.h> + +/ + * Trampoline for the BPF timed may_goto loop bound. Custom calling convention: + * - input: stack offset in BPF_REG_AX (t0) + * - output: updated count in BPF_REG_AX (t0) + * + * Calls bpf_check_timed_may_goto(ptr) with the standard RISC-V ABI, where + * ptr = BPF_REG_FP (s5) + BPF_REG_AX (t0). BPF R0-R5 (a5, a0-a4) are saved + * across the call; BPF_REG_FP (s5) is callee-saved and needs no saving. + / + +SYM_FUNC_START(arch_bpf_timed_may_goto) + addi sp, sp, -64 + sd ra, 56(sp) + sd s0, 48(sp) + addi s0, sp, 64 + + / Save BPF registers R0-R5 (a5, a0-a4) / + sd a5, 40(sp) + sd a0, 32(sp) + sd a1, 24(sp) + sd a2, 16(sp) + sd a3, 8(sp) + sd a4, 0(sp) + + add a0, t0, s5 + call bpf_check_timed_may_goto + mv t0, a0 + + / Restore BPF registers R0-R5 / + ld a4, 0(sp) + ld a3, 8(sp) + ld a2, 16(sp) + ld a1, 24(sp) + ld a0, 32(sp) + ld a5, 40(sp) + + ld s0, 48(sp) + ld ra, 56(sp) + addi sp, sp, 64 + ret +SYM_FUNC_END(arch_bpf_timed_may_goto) diff --git a/tools/testing/selftests/bpf/progs/stream.c b/tools/testing/selftests/bpf/progs/stream.c index 92ba1d72e0ece4..8d8e53d37266cd 100644 --- a/tools/testing/selftests/bpf/progs/stream.c +++ b/tools/testing/selftests/bpf/progs/stream.c @@ -64,6 +64,7 @@ SEC("syscall") __arch_x86_64 __arch_arm64 __arch_s390x +__arch_riscv64 __success __retval(0) __stderr("ERROR: Timeout detected for may_goto instruction") __stderr("CPU: {{[0-9]+}} UID: 0 PID: {{[0-9]+}} Comm: {{.}}") diff --git a/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c b/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c index 8d7ff38e4c0697..e6671c54e53ada 100644 --- a/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c +++ b/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c @@ -660,6 +660,7 @@ __naked void may_goto_interaction_x86_64(void) SEC("raw_tp") __arch_arm64 +__arch_riscv64 __log_level(4) __msg("stack depth 24") /* may_goto counter at -24 / __xlated("0: (u64 )(r10 -24) =") diff --git a/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c b/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c index 4bdf4256a41e51..f47b9d540a1759 100644 --- a/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c +++ b/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c @@ -11,6 +11,7 @@ __description("may_goto 0") __arch_x86_64 __arch_s390x __arch_arm64 +__arch_riscv64 __xlated("0: r0 = 1") __xlated("1: exit") __success @@ -31,6 +32,7 @@ __description("batch 2 of may_goto 0") __arch_x86_64 __arch_s390x __arch_arm64 +__arch_riscv64 __xlated("0: r0 = 1") __xlated("1: exit") __success @@ -53,6 +55,7 @@ __description("may_goto batch with offsets 2/1/0") __arch_x86_64 __arch_s390x __arch_arm64 +__arch_riscv64 __xlated("0: r0 = 1") __xlated("1: exit") __success @@ -79,6 +82,7 @@ __description("may_goto batch with offsets 2/0") __arch_x86_64 __arch_s390x __arch_arm64 +__arch_riscv64 __xlated("0: (u64 )(r10 -16) = 65535") __xlated("1: (u64 )(r10 -8) = 0") __xlated("2: r12 = (u64 *)(r10 -16)")
3/2	2026/07/15 13:30	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 4027 output: 46 thoughts: 697 Thoughts: Fuzzing Feasibility: RISC-V 64-bit BPF JIT `bpf_timed_may_goto` Patch Okay, so I have a patch here that adds support for `bpf_timed_may_goto` to the RISC-V 64-bit BPF JIT compiler. My initial thought is, "Is this worth fuzzing?" Let's break it down. It definitely adds new functionality, which is the prime target. RISC-V 64-bit is supported by syzkaller, which is great – that's a check. Functionally, yes, the patch provides the necessary trampoline and JIT compiler modification. Now, config options... I need to figure out the relevant ones to ensure syzkaller can build with this enabled. Looking at the changes, it seems to reside in `arch/riscv/net/`. So, `CONFIG_BPF_JIT` is going to be essential, and because it's a 64-bit addition, `CONFIG_ARCH_RV64I` or its implicit equivalent, should also be important. Okay, checking the Makefile confirms this: ```makefile ifeq ($(CONFIG_ARCH_RV64I),y) obj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o bpf_timed_may_goto.o else obj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o endif ``` `CONFIG_BPF_JIT` and the 64-bit architecture is the key; `CONFIG_ARCH_RV64I` is a given for 64-bit RISC-V systems. This is an important piece of information to ensure that fuzzing configurations are correct. Now, which functions are the focal point for potential fuzzing? * `bpf_jit_emit_insn` in `arch/riscv/net/bpf_jit_comp64.c` * `bpf_jit_supports_timed_may_goto` in `arch/riscv/net/bpf_jit_comp64.c` * `arch_bpf_timed_may_goto` in `arch/riscv/net/bpf_timed_may_goto.S` The `bpf_jit_emit_insn` function is particularly interesting. It's used within the BPF JIT compilation process, so it will be called a lot during the JIT process. It's not a data path function per se, but because of its complexity, it's a good place to start the analysis. It is likely a hot path, though probably not in the "normal" data path sense; it is a hot control path. I will check the context of `bpf_jit_emit_insn` to gain a better understanding.
4/2	2026/07/15 13:30	tool	grepper	0m Args: { "Expression": "bpf_jit_emit_insn", "PathPrefix": "arch/riscv/net/bpf_jit_comp64.c" } Results: { "Output": "arch/riscv/net/bpf_jit_comp64.c=1332=int arch_prepare_bpf_trampoline(struct bpf_tramp_image im, void ro_image,\n--\narch/riscv/net/bpf_jit_comp64.c-1368-\narch/riscv/net/bpf_jit_comp64.c:1369:int bpf_jit_emit_insn(const struct bpf_insn insn, struct rv_jit_context ctx,\narch/riscv/net/bpf_jit_comp64.c-1370-\t\t bool extra_pass)\n" }
5/2	2026/07/15 13:30	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 5583 output: 49 thoughts: 158 Thoughts: My Assessment of BPF JIT Support Okay, so I'm focusing on the instruction emission process within the BPF JIT, and it looks like `bpf_jit_emit_insn` is the core function. I'll definitely want to include that. Now, let's also bring in `bpf_jit_supports_timed_may_goto` and `arch_bpf_timed_may_goto`. Hmm, hold on... `arch_bpf_timed_may_goto` is assembly code, isn't it? That could be a problem for fuzzers like syzkaller, especially when combined with KCOV, as they generally have a hard time instrumenting assembly directly unless it's specially annotated or invoked from instrumented C code. I can still list it, or maybe I should just stick to the C functions in this particular scenario. To be sure, I should probably check `arch/riscv/net/bpf_jit_comp64.c` just to be certain about the implementation and usage of `bpf_jit_supports_timed_may_goto` on that architecture.
6/2	2026/07/15 13:30	tool	grepper	0m Args: { "Expression": "bpf_jit_supports_timed_may_goto", "PathPrefix": "arch/riscv/net/bpf_jit_comp64.c" } Results: { "Output": "arch/riscv/net/bpf_jit_comp64.c=2162=bool bpf_jit_supports_fsession(void)\n--\narch/riscv/net/bpf_jit_comp64.c-2166-\narch/riscv/net/bpf_jit_comp64.c:2167:bool bpf_jit_supports_timed_may_goto(void)\narch/riscv/net/bpf_jit_comp64.c-2168-{\n" }
7/2	2026/07/15 13:30	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 6174 output: 33 thoughts: 110 Thoughts: My Analysis of Recent Code Changes Okay, let's take a look at these modifications. First, I need to make sure I haven't missed any other impacted functions. A quick scan... no, it looks like only `bpf_jit_emit_insn`, `bpf_jit_supports_timed_may_goto`, and `arch_bpf_timed_may_goto` are touched. That's a reasonable scope. Now, let's nail down the dependencies. The change obviously requires `BPF_JIT`. That's a given. But to ensure things function as expected, the ability to load these BPF programs is essential; therefore, I’ll need to make certain `BPF_SYSCALL` is enabled, too. To double-check everything, I'll need to go over the `arch/riscv/net/Makefile` to confirm there isn't anything I've overlooked. I need to make certain that the module is being built appropriately.
8/2	2026/07/15 13:30	tool	grepper	0m Args: { "Expression": "BPF_JIT", "PathPrefix": "arch/riscv/net/Makefile" } Results: { "Output": "arch/riscv/net/Makefile-2-\narch/riscv/net/Makefile:3:obj-$(CONFIG_BPF_JIT) += bpf_jit_core.o\narch/riscv/net/Makefile-4-\narch/riscv/net/Makefile=5=ifeq ($(CONFIG_ARCH_RV64I),y)\narch/riscv/net/Makefile:6:\tobj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o bpf_timed_may_goto.o\narch/riscv/net/Makefile-7-else\narch/riscv/net/Makefile:8:\tobj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o\narch/riscv/net/Makefile-9-endif\n" }
9/2	2026/07/15 13:30	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 6735 output: 149 thoughts: 94 Thoughts: Okay, here's my assessment of this patch, formatted as requested: RISC-V BPF JIT Feature and Fuzzing Considerations Alright, so the core of this patch seems to hinge on `BPF_JIT` as the controlling configuration option. That's the key to enabling the RISC-V BPF JIT compiler's new functionality. The patch itself is functional, which is good, but now that we're adding new code, it's immediately apparent this needs serious fuzzing attention. Specifically, I need to focus on a few key symbols to get started. The `bpf_jit_emit_insn` function is critical, obviously, as it's the instruction emitter for the JIT. We'll also need to carefully examine `bpf_jit_supports_timed_may_goto`, and `arch_bpf_timed_may_goto` and understand how these are interacting within the new JIT context. These timed gotos often introduce more complex control flows so must be tested thoroughly. Let's set up the fuzzing environment with those in mind, and get the results in place.
10/2	2026/07/15 13:30	tool	set-results	0m Args: { "EnableConfigs": [ "BPF_JIT", "BPF_SYSCALL" ], "FocusSymbols": [ "bpf_jit_emit_insn", "bpf_jit_supports_timed_may_goto", "arch_bpf_timed_may_goto" ], "Reasoning": "The patch adds support for the `bpf_timed_may_goto` instruction in the RISC-V 64-bit BPF JIT compiler. It modifies the JIT instruction emitter and adds a new assembly trampoline, which are functional changes that can be reached by loading specific BPF programs.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "BPF_JIT", "BPF_SYSCALL" ], "FocusSymbols": [ "bpf_jit_emit_insn", "bpf_jit_supports_timed_may_goto", "arch_bpf_timed_may_goto" ], "Reasoning": "The patch adds support for the `bpf_timed_may_goto` instruction in the RISC-V 64-bit BPF JIT compiler. It modifies the JIT instruction emitter and adds a new assembly trampoline, which are functional changes that can be reached by loading specific BPF programs.", "WorthFuzzing": true }

{
  "EnableConfigs": [
    "BPF_JIT",
    "BPF_SYSCALL"
  ],
  "FocusSymbols": [
    "bpf_jit_emit_insn",
    "bpf_jit_supports_timed_may_goto",
    "arch_bpf_timed_may_goto"
  ],
  "Reasoning": "The patch adds support for the `bpf_timed_may_goto` instruction in the RISC-V 64-bit BPF JIT compiler. It modifies the JIT instruction emitter and adds a new assembly trampoline, which are functional changes that can be reached by loading specific BPF programs.",
  "WorthFuzzing": true
}

{
  "PatchDiff": "commit a69d4334958a7afe53c22aac0a23b91b64e6fa7e\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Jul 15 13:30:28 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/arch/riscv/net/Makefile b/arch/riscv/net/Makefile\nindex 9a1e5f0a94e559..6458d4d51990a7 100644\n--- a/arch/riscv/net/Makefile\n+++ b/arch/riscv/net/Makefile\n@@ -3,7 +3,7 @@\n obj-$(CONFIG_BPF_JIT) += bpf_jit_core.o\n \n ifeq ($(CONFIG_ARCH_RV64I),y)\n-\tobj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o\n+\tobj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o bpf_timed_may_goto.o\n else\n \tobj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o\n endif\ndiff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c\nindex c03c1de16b79ac..4f88a446278ae8 100644\n--- a/arch/riscv/net/bpf_jit_comp64.c\n+++ b/arch/riscv/net/bpf_jit_comp64.c\n@@ -1841,7 +1841,13 @@ int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,\n \t\tif (ret)\n \t\t\treturn ret;\n \n-\t\tif (insn-\u003esrc_reg != BPF_PSEUDO_CALL)\n+\t\t/*\n+\t\t * arch_bpf_timed_may_goto() is emitted by the verifier and\n+\t\t * returns its result in BPF_REG_AX instead of BPF_REG_0, so\n+\t\t * skip the normal \"move return register into R0\".\n+\t\t */\n+\t\tif (insn-\u003esrc_reg != BPF_PSEUDO_CALL \u0026\u0026\n+\t\t    addr != (u64)arch_bpf_timed_may_goto)\n \t\t\temit_mv(bpf_to_rv_reg(BPF_REG_0, ctx), RV_REG_A0, ctx);\n \t\tbreak;\n \t}\n@@ -2157,3 +2163,8 @@ bool bpf_jit_supports_fsession(void)\n {\n \treturn true;\n }\n+\n+bool bpf_jit_supports_timed_may_goto(void)\n+{\n+\treturn true;\n+}\ndiff --git a/arch/riscv/net/bpf_timed_may_goto.S b/arch/riscv/net/bpf_timed_may_goto.S\nnew file mode 100644\nindex 00000000000000..f4bf2cd105866b\n--- /dev/null\n+++ b/arch/riscv/net/bpf_timed_may_goto.S\n@@ -0,0 +1,47 @@\n+/* SPDX-License-Identifier: GPL-2.0 */\n+/* Copyright (c) 2026 Feng Jiang \u003cjiangfeng@kylinos.cn\u003e */\n+\n+#include \u003clinux/linkage.h\u003e\n+#include \u003casm/asm.h\u003e\n+\n+/*\n+ * Trampoline for the BPF timed may_goto loop bound. Custom calling convention:\n+ *\t- input:  stack offset in BPF_REG_AX (t0)\n+ *\t- output: updated count in BPF_REG_AX (t0)\n+ *\n+ * Calls bpf_check_timed_may_goto(ptr) with the standard RISC-V ABI, where\n+ * ptr = BPF_REG_FP (s5) + BPF_REG_AX (t0). BPF R0-R5 (a5, a0-a4) are saved\n+ * across the call; BPF_REG_FP (s5) is callee-saved and needs no saving.\n+ */\n+\n+SYM_FUNC_START(arch_bpf_timed_may_goto)\n+\taddi\tsp, sp, -64\n+\tsd\tra, 56(sp)\n+\tsd\ts0, 48(sp)\n+\taddi\ts0, sp, 64\n+\n+\t/* Save BPF registers R0-R5 (a5, a0-a4) */\n+\tsd\ta5, 40(sp)\n+\tsd\ta0, 32(sp)\n+\tsd\ta1, 24(sp)\n+\tsd\ta2, 16(sp)\n+\tsd\ta3, 8(sp)\n+\tsd\ta4, 0(sp)\n+\n+\tadd\ta0, t0, s5\n+\tcall\tbpf_check_timed_may_goto\n+\tmv\tt0, a0\n+\n+\t/* Restore BPF registers R0-R5 */\n+\tld\ta4, 0(sp)\n+\tld\ta3, 8(sp)\n+\tld\ta2, 16(sp)\n+\tld\ta1, 24(sp)\n+\tld\ta0, 32(sp)\n+\tld\ta5, 40(sp)\n+\n+\tld\ts0, 48(sp)\n+\tld\tra, 56(sp)\n+\taddi\tsp, sp, 64\n+\tret\n+SYM_FUNC_END(arch_bpf_timed_may_goto)\ndiff --git a/tools/testing/selftests/bpf/progs/stream.c b/tools/testing/selftests/bpf/progs/stream.c\nindex 92ba1d72e0ece4..8d8e53d37266cd 100644\n--- a/tools/testing/selftests/bpf/progs/stream.c\n+++ b/tools/testing/selftests/bpf/progs/stream.c\n@@ -64,6 +64,7 @@ SEC(\"syscall\")\n __arch_x86_64\n __arch_arm64\n __arch_s390x\n+__arch_riscv64\n __success __retval(0)\n __stderr(\"ERROR: Timeout detected for may_goto instruction\")\n __stderr(\"CPU: {{[0-9]+}} UID: 0 PID: {{[0-9]+}} Comm: {{.*}}\")\ndiff --git a/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c b/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c\nindex 8d7ff38e4c0697..e6671c54e53ada 100644\n--- a/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c\n+++ b/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c\n@@ -660,6 +660,7 @@ __naked void may_goto_interaction_x86_64(void)\n \n SEC(\"raw_tp\")\n __arch_arm64\n+__arch_riscv64\n __log_level(4) __msg(\"stack depth 24\")\n /* may_goto counter at -24 */\n __xlated(\"0: *(u64 *)(r10 -24) =\")\ndiff --git a/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c b/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c\nindex 4bdf4256a41e51..f47b9d540a1759 100644\n--- a/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c\n+++ b/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c\n@@ -11,6 +11,7 @@ __description(\"may_goto 0\")\n __arch_x86_64\n __arch_s390x\n __arch_arm64\n+__arch_riscv64\n __xlated(\"0: r0 = 1\")\n __xlated(\"1: exit\")\n __success\n@@ -31,6 +32,7 @@ __description(\"batch 2 of may_goto 0\")\n __arch_x86_64\n __arch_s390x\n __arch_arm64\n+__arch_riscv64\n __xlated(\"0: r0 = 1\")\n __xlated(\"1: exit\")\n __success\n@@ -53,6 +55,7 @@ __description(\"may_goto batch with offsets 2/1/0\")\n __arch_x86_64\n __arch_s390x\n __arch_arm64\n+__arch_riscv64\n __xlated(\"0: r0 = 1\")\n __xlated(\"1: exit\")\n __success\n@@ -79,6 +82,7 @@ __description(\"may_goto batch with offsets 2/0\")\n __arch_x86_64\n __arch_s390x\n __arch_arm64\n+__arch_riscv64\n __xlated(\"0: *(u64 *)(r10 -16) = 65535\")\n __xlated(\"1: *(u64 *)(r10 -8) = 0\")\n __xlated(\"2: r12 = *(u64 *)(r10 -16)\")\n"
}

gemini-3.1-pro-preview

{
  "EnableConfigs": [
    "BPF_JIT",
    "BPF_SYSCALL"
  ],
  "FocusSymbols": [
    "bpf_jit_emit_insn",
    "bpf_jit_supports_timed_may_goto",
    "arch_bpf_timed_may_goto"
  ],
  "Reasoning": "The patch adds support for the `bpf_timed_may_goto` instruction in the RISC-V 64-bit BPF JIT compiler. It modifies the JIT instruction emitter and adds a new assembly trampoline, which are functional changes that can be reached by loading specific BPF programs.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. List them in the EnableConfigs output array,
   and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

For your convenience, here is the diff of the changes:
commit a69d4334958a7afe53c22aac0a23b91b64e6fa7e
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Jul 15 13:30:28 2026 +0000

    syz-cluster: applied patch under review

diff --git a/arch/riscv/net/Makefile b/arch/riscv/net/Makefile
index 9a1e5f0a94e559..6458d4d51990a7 100644
--- a/arch/riscv/net/Makefile
+++ b/arch/riscv/net/Makefile
@@ -3,7 +3,7 @@
 obj-$(CONFIG_BPF_JIT) += bpf_jit_core.o
 
 ifeq ($(CONFIG_ARCH_RV64I),y)
-	obj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o
+	obj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o bpf_timed_may_goto.o
 else
 	obj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o
 endif
diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index c03c1de16b79ac..4f88a446278ae8 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -1841,7 +1841,13 @@ int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,
 		if (ret)
 			return ret;
 
-		if (insn->src_reg != BPF_PSEUDO_CALL)
+		/*
+		 * arch_bpf_timed_may_goto() is emitted by the verifier and
+		 * returns its result in BPF_REG_AX instead of BPF_REG_0, so
+		 * skip the normal "move return register into R0".
+		 */
+		if (insn->src_reg != BPF_PSEUDO_CALL &&
+		    addr != (u64)arch_bpf_timed_may_goto)
 			emit_mv(bpf_to_rv_reg(BPF_REG_0, ctx), RV_REG_A0, ctx);
 		break;
 	}
@@ -2157,3 +2163,8 @@ bool bpf_jit_supports_fsession(void)
 {
 	return true;
 }
+
+bool bpf_jit_supports_timed_may_goto(void)
+{
+	return true;
+}
diff --git a/arch/riscv/net/bpf_timed_may_goto.S b/arch/riscv/net/bpf_timed_may_goto.S
new file mode 100644
index 00000000000000..f4bf2cd105866b
--- /dev/null
+++ b/arch/riscv/net/bpf_timed_may_goto.S
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2026 Feng Jiang <jiangfeng@kylinos.cn> */
+
+#include <linux/linkage.h>
+#include <asm/asm.h>
+
+/*
+ * Trampoline for the BPF timed may_goto loop bound. Custom calling convention:
+ *	- input:  stack offset in BPF_REG_AX (t0)
+ *	- output: updated count in BPF_REG_AX (t0)
+ *
+ * Calls bpf_check_timed_may_goto(ptr) with the standard RISC-V ABI, where
+ * ptr = BPF_REG_FP (s5) + BPF_REG_AX (t0). BPF R0-R5 (a5, a0-a4) are saved
+ * across the call; BPF_REG_FP (s5) is callee-saved and needs no saving.
+ */
+
+SYM_FUNC_START(arch_bpf_timed_may_goto)
+	addi	sp, sp, -64
+	sd	ra, 56(sp)
+	sd	s0, 48(sp)
+	addi	s0, sp, 64
+
+	/* Save BPF registers R0-R5 (a5, a0-a4) */
+	sd	a5, 40(sp)
+	sd	a0, 32(sp)
+	sd	a1, 24(sp)
+	sd	a2, 16(sp)
+	sd	a3, 8(sp)
+	sd	a4, 0(sp)
+
+	add	a0, t0, s5
+	call	bpf_check_timed_may_goto
+	mv	t0, a0
+
+	/* Restore BPF registers R0-R5 */
+	ld	a4, 0(sp)
+	ld	a3, 8(sp)
+	ld	a2, 16(sp)
+	ld	a1, 24(sp)
+	ld	a0, 32(sp)
+	ld	a5, 40(sp)
+
+	ld	s0, 48(sp)
+	ld	ra, 56(sp)
+	addi	sp, sp, 64
+	ret
+SYM_FUNC_END(arch_bpf_timed_may_goto)
diff --git a/tools/testing/selftests/bpf/progs/stream.c b/tools/testing/selftests/bpf/progs/stream.c
index 92ba1d72e0ece4..8d8e53d37266cd 100644
--- a/tools/testing/selftests/bpf/progs/stream.c
+++ b/tools/testing/selftests/bpf/progs/stream.c
@@ -64,6 +64,7 @@ SEC("syscall")
 __arch_x86_64
 __arch_arm64
 __arch_s390x
+__arch_riscv64
 __success __retval(0)
 __stderr("ERROR: Timeout detected for may_goto instruction")
 __stderr("CPU: {{[0-9]+}} UID: 0 PID: {{[0-9]+}} Comm: {{.*}}")
diff --git a/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c b/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c
index 8d7ff38e4c0697..e6671c54e53ada 100644
--- a/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c
+++ b/tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c
@@ -660,6 +660,7 @@ __naked void may_goto_interaction_x86_64(void)
 
 SEC("raw_tp")
 __arch_arm64
+__arch_riscv64
 __log_level(4) __msg("stack depth 24")
 /* may_goto counter at -24 */
 __xlated("0: *(u64 *)(r10 -24) =")
diff --git a/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c b/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c
index 4bdf4256a41e51..f47b9d540a1759 100644
--- a/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c
+++ b/tools/testing/selftests/bpf/progs/verifier_may_goto_1.c
@@ -11,6 +11,7 @@ __description("may_goto 0")
 __arch_x86_64
 __arch_s390x
 __arch_arm64
+__arch_riscv64
 __xlated("0: r0 = 1")
 __xlated("1: exit")
 __success
@@ -31,6 +32,7 @@ __description("batch 2 of may_goto 0")
 __arch_x86_64
 __arch_s390x
 __arch_arm64
+__arch_riscv64
 __xlated("0: r0 = 1")
 __xlated("1: exit")
 __success
@@ -53,6 +55,7 @@ __description("may_goto batch with offsets 2/1/0")
 __arch_x86_64
 __arch_s390x
 __arch_arm64
+__arch_riscv64
 __xlated("0: r0 = 1")
 __xlated("1: exit")
 __success
@@ -79,6 +82,7 @@ __description("may_goto batch with offsets 2/0")
 __arch_x86_64
 __arch_s390x
 __arch_arm64
+__arch_riscv64
 __xlated("0: *(u64 *)(r10 -16) = 65535")
 __xlated("1: *(u64 *)(r10 -8) = 0")
 __xlated("2: r12 = *(u64 *)(r10 -16)")

gemini-3.1-pro-preview

							input: 4027
							output: 46
							thoughts: 697

**Fuzzing Feasibility: RISC-V 64-bit BPF JIT `bpf_timed_may_goto` Patch**

Okay, so I have a patch here that adds support for `bpf_timed_may_goto` to the RISC-V 64-bit BPF JIT compiler. My initial thought is, "Is this worth fuzzing?" Let's break it down. It definitely adds new functionality, which is the prime target. RISC-V 64-bit is supported by syzkaller, which is great – that's a check. Functionally, yes, the patch provides the necessary trampoline and JIT compiler modification.

Now, config options... I need to figure out the relevant ones to ensure syzkaller can build with this enabled. Looking at the changes, it seems to reside in `arch/riscv/net/`. So, `CONFIG_BPF_JIT` is going to be essential, and because it's a 64-bit addition, `CONFIG_ARCH_RV64I` or its implicit equivalent, should also be important. Okay, checking the Makefile confirms this:
```makefile
ifeq ($(CONFIG_ARCH_RV64I),y)
	obj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o bpf_timed_may_goto.o
else
	obj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o
endif
```
`CONFIG_BPF_JIT` and the 64-bit architecture is the key; `CONFIG_ARCH_RV64I` is a given for 64-bit RISC-V systems. This is an important piece of information to ensure that fuzzing configurations are correct.

Now, which functions are the focal point for potential fuzzing?
*   `bpf_jit_emit_insn` in `arch/riscv/net/bpf_jit_comp64.c`
*   `bpf_jit_supports_timed_may_goto` in `arch/riscv/net/bpf_jit_comp64.c`
*   `arch_bpf_timed_may_goto` in `arch/riscv/net/bpf_timed_may_goto.S`

The `bpf_jit_emit_insn` function is particularly interesting. It's used within the BPF JIT compilation process, so it will be called a lot during the JIT process. It's not a data path function per se, but because of its complexity, it's a good place to start the analysis. It is likely a hot path, though probably not in the "normal" data path sense; it is a hot *control* path. I will check the context of `bpf_jit_emit_insn` to gain a better understanding.

{
  "Expression": "bpf_jit_emit_insn",
  "PathPrefix": "arch/riscv/net/bpf_jit_comp64.c"
}

{
  "Output": "arch/riscv/net/bpf_jit_comp64.c=1332=int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *ro_image,\n--\narch/riscv/net/bpf_jit_comp64.c-1368-\narch/riscv/net/bpf_jit_comp64.c:1369:int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,\narch/riscv/net/bpf_jit_comp64.c-1370-\t\t      bool extra_pass)\n"
}

gemini-3.1-pro-preview

							input: 5583
							output: 49
							thoughts: 158

**My Assessment of BPF JIT Support**

Okay, so I'm focusing on the instruction emission process within the BPF JIT, and it looks like `bpf_jit_emit_insn` is the core function. I'll definitely want to include that.

Now, let's also bring in `bpf_jit_supports_timed_may_goto` and `arch_bpf_timed_may_goto`. Hmm, hold on... `arch_bpf_timed_may_goto` is assembly code, isn't it? That could be a problem for fuzzers like syzkaller, especially when combined with KCOV, as they generally have a hard time instrumenting assembly directly unless it's specially annotated or invoked from instrumented C code.

I can still list it, or maybe I should just stick to the C functions in this particular scenario. To be sure, I should probably check `arch/riscv/net/bpf_jit_comp64.c` just to be certain about the implementation and usage of `bpf_jit_supports_timed_may_goto` on that architecture.

{
  "Expression": "bpf_jit_supports_timed_may_goto",
  "PathPrefix": "arch/riscv/net/bpf_jit_comp64.c"
}

{
  "Output": "arch/riscv/net/bpf_jit_comp64.c=2162=bool bpf_jit_supports_fsession(void)\n--\narch/riscv/net/bpf_jit_comp64.c-2166-\narch/riscv/net/bpf_jit_comp64.c:2167:bool bpf_jit_supports_timed_may_goto(void)\narch/riscv/net/bpf_jit_comp64.c-2168-{\n"
}

gemini-3.1-pro-preview

							input: 6174
							output: 33
							thoughts: 110

**My Analysis of Recent Code Changes**

Okay, let's take a look at these modifications. First, I need to make sure I haven't missed any other impacted functions. A quick scan... no, it looks like only `bpf_jit_emit_insn`, `bpf_jit_supports_timed_may_goto`, and `arch_bpf_timed_may_goto` are touched. That's a reasonable scope.

Now, let's nail down the dependencies. The change *obviously* requires `BPF_JIT`. That's a given. But to ensure things function as expected, the ability to load these BPF programs is essential; therefore, I’ll need to make certain `BPF_SYSCALL` is enabled, too.

To double-check everything, I'll need to go over the `arch/riscv/net/Makefile` to confirm there isn't anything I've overlooked. I need to make certain that the module is being built appropriately.

{
  "Expression": "BPF_JIT",
  "PathPrefix": "arch/riscv/net/Makefile"
}

{
  "Output": "arch/riscv/net/Makefile-2-\narch/riscv/net/Makefile:3:obj-$(CONFIG_BPF_JIT) += bpf_jit_core.o\narch/riscv/net/Makefile-4-\narch/riscv/net/Makefile=5=ifeq ($(CONFIG_ARCH_RV64I),y)\narch/riscv/net/Makefile:6:\tobj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o bpf_timed_may_goto.o\narch/riscv/net/Makefile-7-else\narch/riscv/net/Makefile:8:\tobj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o\narch/riscv/net/Makefile-9-endif\n"
}

gemini-3.1-pro-preview

							input: 6735
							output: 149
							thoughts: 94

Okay, here's my assessment of this patch, formatted as requested:

**RISC-V BPF JIT Feature and Fuzzing Considerations**

Alright, so the core of this patch seems to hinge on `BPF_JIT` as the controlling configuration option. That's the key to enabling the RISC-V BPF JIT compiler's new functionality. The patch itself is functional, which is good, but now that we're adding new code, it's immediately apparent this needs serious fuzzing attention.

Specifically, I need to focus on a few key symbols to get started. The `bpf_jit_emit_insn` function is critical, obviously, as it's the instruction emitter for the JIT. We'll also need to carefully examine `bpf_jit_supports_timed_may_goto`, and `arch_bpf_timed_may_goto` and understand how these are interacting within the new JIT context. These timed gotos often introduce more complex control flows so must be tested thoroughly.

Let's set up the fuzzing environment with those in mind, and get the results in place.

{
  "EnableConfigs": [
    "BPF_JIT",
    "BPF_SYSCALL"
  ],
  "FocusSymbols": [
    "bpf_jit_emit_insn",
    "bpf_jit_supports_timed_may_goto",
    "arch_bpf_timed_may_goto"
  ],
  "Reasoning": "The patch adds support for the `bpf_timed_may_goto` instruction in the RISC-V 64-bit BPF JIT compiler. It modifies the JIT instruction emitter and adds a new assembly trampoline, which are functional changes that can be reached by loading specific BPF programs.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "BPF_JIT",
    "BPF_SYSCALL"
  ],
  "FocusSymbols": [
    "bpf_jit_emit_insn",
    "bpf_jit_supports_timed_may_goto",
    "arch_bpf_timed_may_goto"
  ],
  "Reasoning": "The patch adds support for the `bpf_timed_may_goto` instruction in the RISC-V 64-bit BPF JIT compiler. It modifies the JIT instruction emitter and adds a new assembly trampoline, which are functional changes that can be reached by loading specific BPF programs.",
  "WorthFuzzing": true
}

LLM Calls Summary:
Total Calls	Total Tokens	Avg Tokens	Total Duration (Seconds)	Avg Duration (Seconds)

Tool Calls Summary:
Total Calls	Total Duration (Seconds)	Avg Duration (Seconds)