Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 UID: 0 PID: 5988 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:process_timer_func+0xe5/0x290 kernel/bpf/verifier.c:8558 Code: 1f 4c 8d 63 38 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 8a 38 46 00 4d 8b 24 24 49 83 c4 10 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 47 01 00 00 41 8b 0c 24 4c 89 f7 89 ee RSP: 0018:ffffc90003b66f80 EFLAGS: 00010202 RAX: 0000000000000002 RBX: ffff88802701d400 RCX: 0000000000000078 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 0000000000000001 R08: ffff888106b53980 R09: 000000000000000e R10: 0000000000000017 R11: 0000000000000000 R12: 0000000000000010 R13: dffffc0000000000 R14: ffff8880247e0000 R15: ffff888027b90080 FS: 0000555581212500(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30e63fff CR3: 000000010664a000 CR4: 00000000000006f0 Call Trace: check_func_arg kernel/bpf/verifier.c:9885 [inline] check_helper_call+0x20de/0x6a90 kernel/bpf/verifier.c:11526 do_check_insn kernel/bpf/verifier.c:20042 [inline] do_check+0x8b35/0xe520 kernel/bpf/verifier.c:20211 do_check_common+0x1949/0x24f0 kernel/bpf/verifier.c:23378 do_check_main kernel/bpf/verifier.c:23461 [inline] bpf_check+0x1746a/0x1d2d0 kernel/bpf/verifier.c:24821 bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2993 __sys_bpf+0x528/0x870 kernel/bpf/syscall.c:6043 __do_sys_bpf kernel/bpf/syscall.c:6153 [inline] __se_sys_bpf kernel/bpf/syscall.c:6151 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6151 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f00c358eba9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdb3c1bfd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f00c37d5fa0 RCX: 00007f00c358eba9 RDX: 0000000000000094 RSI: 0000200000000400 RDI: 0000000000000005 RBP: 00007f00c3611e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f00c37d5fa0 R14: 00007f00c37d5fa0 R15: 0000000000000003 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:process_timer_func+0xe5/0x290 kernel/bpf/verifier.c:8558 Code: 1f 4c 8d 63 38 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 8a 38 46 00 4d 8b 24 24 49 83 c4 10 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 47 01 00 00 41 8b 0c 24 4c 89 f7 89 ee RSP: 0018:ffffc90003b66f80 EFLAGS: 00010202 RAX: 0000000000000002 RBX: ffff88802701d400 RCX: 0000000000000078 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 0000000000000001 R08: ffff888106b53980 R09: 000000000000000e R10: 0000000000000017 R11: 0000000000000000 R12: 0000000000000010 R13: dffffc0000000000 R14: ffff8880247e0000 R15: ffff888027b90080 FS: 0000555581212500(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30e63fff CR3: 000000010664a000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 4c 8d 63 38 lea 0x38(%rbx),%r12 4: 4c 89 e0 mov %r12,%rax 7: 48 c1 e8 03 shr $0x3,%rax b: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 10: 74 08 je 0x1a 12: 4c 89 e7 mov %r12,%rdi 15: e8 8a 38 46 00 call 0x4638a4 1a: 4d 8b 24 24 mov (%r12),%r12 1e: 49 83 c4 10 add $0x10,%r12 22: 4c 89 e0 mov %r12,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 47 01 00 00 jne 0x17d 36: 41 8b 0c 24 mov (%r12),%ecx 3a: 4c 89 f7 mov %r14,%rdi 3d: 89 ee mov %ebp,%esi