AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies how page table entries are formatted and printed in error messages (e.g., `print_bad_page_map`). It does not alter the functional execution flow of the kernel, as it only affects logging/diagnostic output.",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit c03d60f22a02c5729520e0132ba4b6d9ab2aeae5\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Jul 9 18:57:36 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/mm/memory.c b/mm/memory.c\nindex ff338c2abe9231..c8fe2f373fd272 100644\n--- a/mm/memory.c\n+++ b/mm/memory.c\n@@ -519,9 +519,52 @@ static bool is_bad_page_map_ratelimited(void)\n \treturn false;\n }\n \n+static void ptval_bytes_to_hex_str(char *buf, size_t buf_size, const void *entry, size_t entry_size)\n+{\n+\tif (WARN_ON_ONCE(buf_size \u003c entry_size * 2 + 1)) {\n+\t\tsnprintf(buf, buf_size, \"overflow\");\n+\t\treturn;\n+\t}\n+\n+\tswitch (entry_size) {\n+\tcase sizeof(u32):\n+\t\tsnprintf(buf, buf_size, \"%08x\", *(const u32 *)entry);\n+\t\tbreak;\n+\tcase sizeof(u64):\n+\t\tsnprintf(buf, buf_size, \"%016llx\", *(const u64 *)entry);\n+\t\tbreak;\n+#if defined(__SIZEOF_INT128__)\n+\tcase sizeof(u128):\n+\t\tsnprintf(buf, buf_size, \"%016llx%016llx\",\n+\t\t\t (unsigned long long)(*(const u128 *)entry \u003e\u003e 64),\n+\t\t\t (unsigned long long)*(const u128 *)entry);\n+\t\tbreak;\n+#endif\n+\tdefault:\n+\t\tsnprintf(buf, buf_size, \"unsupported\");\n+\t\tbreak;\n+\t}\n+}\n+\n+#define ptval_to_str(buf, val)\t\t\t\t\t\t\t\t\\\n+\tdo {\t\t\t\t\t\t\t\t\t\t\\\n+\t\tauto __val = (val);\t\t\t\t\t\t\t\\\n+\t\t\t\t\t\t\t\t\t\t\t\\\n+\t\tptval_bytes_to_hex_str((buf), sizeof(buf), \u0026__val, sizeof(__val));\t\\\n+\t} while (0)\n+\n+#if defined(__SIZEOF_INT128__)\n+#define PTVAL_STR_MAX\t(32 + 1) /* Max 128-bit value in hex + NUL */\n+#else\n+#define PTVAL_STR_MAX\t(16 + 1) /* Max 64-bit value in hex + NUL */\n+#endif\n+\n static void __print_bad_page_map_pgtable(struct mm_struct *mm, unsigned long addr)\n {\n-\tunsigned long long pgdv, p4dv, pudv, pmdv;\n+\tchar pgd_str[PTVAL_STR_MAX];\n+\tchar p4d_str[PTVAL_STR_MAX];\n+\tchar pud_str[PTVAL_STR_MAX];\n+\tchar pmd_str[PTVAL_STR_MAX];\n \tp4d_t p4d, *p4dp;\n \tpud_t pud, *pudp;\n \tpmd_t pmd, *pmdp;\n@@ -532,34 +575,34 @@ static void __print_bad_page_map_pgtable(struct mm_struct *mm, unsigned long add\n \t * see locking requirements for print_bad_page_map().\n \t */\n \tpgdp = pgd_offset(mm, addr);\n-\tpgdv = pgd_val(*pgdp);\n+\tptval_to_str(pgd_str, pgd_val(*pgdp));\n \n \tif (!pgd_present(*pgdp) || pgd_leaf(*pgdp)) {\n-\t\tpr_alert(\"pgd:%08llx\\n\", pgdv);\n+\t\tpr_alert(\"pgd:%s\\n\", pgd_str);\n \t\treturn;\n \t}\n \n \tp4dp = p4d_offset(pgdp, addr);\n \tp4d = p4dp_get(p4dp);\n-\tp4dv = p4d_val(p4d);\n+\tptval_to_str(p4d_str, p4d_val(p4d));\n \n \tif (!p4d_present(p4d) || p4d_leaf(p4d)) {\n-\t\tpr_alert(\"pgd:%08llx p4d:%08llx\\n\", pgdv, p4dv);\n+\t\tpr_alert(\"pgd:%s p4d:%s\\n\", pgd_str, p4d_str);\n \t\treturn;\n \t}\n \n \tpudp = pud_offset(p4dp, addr);\n \tpud = pudp_get(pudp);\n-\tpudv = pud_val(pud);\n+\tptval_to_str(pud_str, pud_val(pud));\n \n \tif (!pud_present(pud) || pud_leaf(pud)) {\n-\t\tpr_alert(\"pgd:%08llx p4d:%08llx pud:%08llx\\n\", pgdv, p4dv, pudv);\n+\t\tpr_alert(\"pgd:%s p4d:%s pud:%s\\n\", pgd_str, p4d_str, pud_str);\n \t\treturn;\n \t}\n \n \tpmdp = pmd_offset(pudp, addr);\n \tpmd = pmdp_get(pmdp);\n-\tpmdv = pmd_val(pmd);\n+\tptval_to_str(pmd_str, pmd_val(pmd));\n \n \t/*\n \t * Dumping the PTE would be nice, but it's tricky with CONFIG_HIGHPTE,\n@@ -567,8 +610,7 @@ static void __print_bad_page_map_pgtable(struct mm_struct *mm, unsigned long add\n \t * doing another map would be bad. print_bad_page_map() should\n \t * already take care of printing the PTE.\n \t */\n-\tpr_alert(\"pgd:%08llx p4d:%08llx pud:%08llx pmd:%08llx\\n\", pgdv,\n-\t\t p4dv, pudv, pmdv);\n+\tpr_alert(\"pgd:%s p4d:%s pud:%s pmd:%s\\n\", pgd_str, p4d_str, pud_str, pmd_str);\n }\n \n /*\n@@ -584,10 +626,11 @@ static void __print_bad_page_map_pgtable(struct mm_struct *mm, unsigned long add\n  * page table lock.\n  */\n static void print_bad_page_map(struct vm_area_struct *vma,\n-\t\tunsigned long addr, unsigned long long entry, struct page *page,\n-\t\tenum pgtable_level level)\n+\t\tunsigned long addr, const void *entry, size_t entry_size,\n+\t\tstruct page *page, enum pgtable_level level)\n {\n \tstruct address_space *mapping;\n+\tchar entry_str[PTVAL_STR_MAX];\n \tpgoff_t index;\n \n \tif (is_bad_page_map_ratelimited())\n@@ -596,8 +639,9 @@ static void print_bad_page_map(struct vm_area_struct *vma,\n \tmapping = vma-\u003evm_file ? vma-\u003evm_file-\u003ef_mapping : NULL;\n \tindex = linear_page_index(vma, addr);\n \n-\tpr_alert(\"BUG: Bad page map in process %s  %s:%08llx\", current-\u003ecomm,\n-\t\t pgtable_level_to_str(level), entry);\n+\tptval_bytes_to_hex_str(entry_str, sizeof(entry_str), entry, entry_size);\n+\tpr_alert(\"BUG: Bad page map in process %s  %s:%s\", current-\u003ecomm,\n+\t\t pgtable_level_to_str(level), entry_str);\n \t__print_bad_page_map_pgtable(vma-\u003evm_mm, addr);\n \tif (page)\n \t\tdump_page(page, \"bad page map\");\n@@ -627,8 +671,13 @@ static inline bool pgtable_level_has_pxx_special(enum pgtable_level level)\n \t}\n }\n \n-#define print_bad_pte(vma, addr, pte, page) \\\n-\tprint_bad_page_map(vma, addr, pte_val(pte), page, PGTABLE_LEVEL_PTE)\n+static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,\n+\t\t\t  pte_t pte, struct page *page)\n+{\n+\tauto entry = pte_val(pte);\n+\n+\tprint_bad_page_map(vma, addr, \u0026entry, sizeof(entry), page, PGTABLE_LEVEL_PTE);\n+}\n \n /**\n  * __vm_normal_page() - Get the \"struct page\" associated with a page table entry.\n@@ -636,8 +685,9 @@ static inline bool pgtable_level_has_pxx_special(enum pgtable_level level)\n  * @addr: The address where the page table entry is mapped.\n  * @pfn: The PFN stored in the page table entry.\n  * @special: Whether the page table entry is marked \"special\".\n- * @level: The page table level for error reporting purposes only.\n  * @entry: The page table entry value for error reporting purposes only.\n+ * @entry_size: The size of @entry.\n+ * @level: The page table level for error reporting purposes only.\n  *\n  * \"Special\" mappings do not wish to be associated with a \"struct page\" (either\n  * it doesn't exist, or it exists but they don't want to touch it). In this\n@@ -697,7 +747,7 @@ static inline bool pgtable_level_has_pxx_special(enum pgtable_level level)\n  */\n static inline struct page *__vm_normal_page(struct vm_area_struct *vma,\n \t\tunsigned long addr, unsigned long pfn, bool special,\n-\t\tunsigned long long entry, enum pgtable_level level)\n+\t\tconst void *entry, size_t entry_size, enum pgtable_level level)\n {\n \tif (pgtable_level_has_pxx_special(level)) {\n \t\tif (unlikely(special)) {\n@@ -710,7 +760,7 @@ static inline struct page *__vm_normal_page(struct vm_area_struct *vma,\n \t\t\tif (is_zero_pfn(pfn) || is_huge_zero_pfn(pfn))\n \t\t\t\treturn NULL;\n \n-\t\t\tprint_bad_page_map(vma, addr, entry, NULL, level);\n+\t\t\tprint_bad_page_map(vma, addr, entry, entry_size, NULL, level);\n \t\t\treturn NULL;\n \t\t}\n \t\t/*\n@@ -741,7 +791,7 @@ static inline struct page *__vm_normal_page(struct vm_area_struct *vma,\n \n \tif (unlikely(pfn \u003e highest_memmap_pfn)) {\n \t\t/* Corrupted page table entry. */\n-\t\tprint_bad_page_map(vma, addr, entry, NULL, level);\n+\t\tprint_bad_page_map(vma, addr, entry, entry_size, NULL, level);\n \t\treturn NULL;\n \t}\n \t/*\n@@ -767,8 +817,10 @@ static inline struct page *__vm_normal_page(struct vm_area_struct *vma,\n struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,\n \t\t\t    pte_t pte)\n {\n+\tauto entry = pte_val(pte);\n+\n \treturn __vm_normal_page(vma, addr, pte_pfn(pte), pte_special(pte),\n-\t\t\t\tpte_val(pte), PGTABLE_LEVEL_PTE);\n+\t\t\t\t\u0026entry, sizeof(entry), PGTABLE_LEVEL_PTE);\n }\n \n /**\n@@ -809,8 +861,10 @@ struct folio *vm_normal_folio(struct vm_area_struct *vma, unsigned long addr,\n struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,\n \t\t\t\tpmd_t pmd)\n {\n+\tauto entry = pmd_val(pmd);\n+\n \treturn __vm_normal_page(vma, addr, pmd_pfn(pmd), pmd_special(pmd),\n-\t\t\t\tpmd_val(pmd), PGTABLE_LEVEL_PMD);\n+\t\t\t\t\u0026entry, sizeof(entry), PGTABLE_LEVEL_PMD);\n }\n \n /**\n@@ -850,8 +904,10 @@ struct folio *vm_normal_folio_pmd(struct vm_area_struct *vma,\n struct page *vm_normal_page_pud(struct vm_area_struct *vma,\n \t\tunsigned long addr, pud_t pud)\n {\n+\tauto entry = pud_val(pud);\n+\n \treturn __vm_normal_page(vma, addr, pud_pfn(pud), pud_special(pud),\n-\t\t\t\tpud_val(pud), PGTABLE_LEVEL_PUD);\n+\t\t\t\t\u0026entry, sizeof(entry), PGTABLE_LEVEL_PUD);\n }\n #endif\n \n"
}

gemini-3.1-pro-preview

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies how page table entries are formatted and printed in error messages (e.g., `print_bad_page_map`). It does not alter the functional execution flow of the kernel, as it only affects logging/diagnostic output.",
  "WorthFuzzing": false
}

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 c03d60f22a02c5729520e0132ba4b6d9ab2aeae5
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Jul 9 18:57:36 2026 +0000

    syz-cluster: applied patch under review

diff --git a/mm/memory.c b/mm/memory.c
index ff338c2abe9231..c8fe2f373fd272 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -519,9 +519,52 @@ static bool is_bad_page_map_ratelimited(void)
 	return false;
 }
 
+static void ptval_bytes_to_hex_str(char *buf, size_t buf_size, const void *entry, size_t entry_size)
+{
+	if (WARN_ON_ONCE(buf_size < entry_size * 2 + 1)) {
+		snprintf(buf, buf_size, "overflow");
+		return;
+	}
+
+	switch (entry_size) {
+	case sizeof(u32):
+		snprintf(buf, buf_size, "%08x", *(const u32 *)entry);
+		break;
+	case sizeof(u64):
+		snprintf(buf, buf_size, "%016llx", *(const u64 *)entry);
+		break;
+#if defined(__SIZEOF_INT128__)
+	case sizeof(u128):
+		snprintf(buf, buf_size, "%016llx%016llx",
+			 (unsigned long long)(*(const u128 *)entry >> 64),
+			 (unsigned long long)*(const u128 *)entry);
+		break;
+#endif
+	default:
+		snprintf(buf, buf_size, "unsupported");
+		break;
+	}
+}
+
+#define ptval_to_str(buf, val)								\
+	do {										\
+		auto __val = (val);							\
+											\
+		ptval_bytes_to_hex_str((buf), sizeof(buf), &__val, sizeof(__val));	\
+	} while (0)
+
+#if defined(__SIZEOF_INT128__)
+#define PTVAL_STR_MAX	(32 + 1) /* Max 128-bit value in hex + NUL */
+#else
+#define PTVAL_STR_MAX	(16 + 1) /* Max 64-bit value in hex + NUL */
+#endif
+
 static void __print_bad_page_map_pgtable(struct mm_struct *mm, unsigned long addr)
 {
-	unsigned long long pgdv, p4dv, pudv, pmdv;
+	char pgd_str[PTVAL_STR_MAX];
+	char p4d_str[PTVAL_STR_MAX];
+	char pud_str[PTVAL_STR_MAX];
+	char pmd_str[PTVAL_STR_MAX];
 	p4d_t p4d, *p4dp;
 	pud_t pud, *pudp;
 	pmd_t pmd, *pmdp;
@@ -532,34 +575,34 @@ static void __print_bad_page_map_pgtable(struct mm_struct *mm, unsigned long add
 	 * see locking requirements for print_bad_page_map().
 	 */
 	pgdp = pgd_offset(mm, addr);
-	pgdv = pgd_val(*pgdp);
+	ptval_to_str(pgd_str, pgd_val(*pgdp));
 
 	if (!pgd_present(*pgdp) || pgd_leaf(*pgdp)) {
-		pr_alert("pgd:%08llx\n", pgdv);
+		pr_alert("pgd:%s\n", pgd_str);
 		return;
 	}
 
 	p4dp = p4d_offset(pgdp, addr);
 	p4d = p4dp_get(p4dp);
-	p4dv = p4d_val(p4d);
+	ptval_to_str(p4d_str, p4d_val(p4d));
 
 	if (!p4d_present(p4d) || p4d_leaf(p4d)) {
-		pr_alert("pgd:%08llx p4d:%08llx\n", pgdv, p4dv);
+		pr_alert("pgd:%s p4d:%s\n", pgd_str, p4d_str);
 		return;
 	}
 
 	pudp = pud_offset(p4dp, addr);
 	pud = pudp_get(pudp);
-	pudv = pud_val(pud);
+	ptval_to_str(pud_str, pud_val(pud));
 
 	if (!pud_present(pud) || pud_leaf(pud)) {
-		pr_alert("pgd:%08llx p4d:%08llx pud:%08llx\n", pgdv, p4dv, pudv);
+		pr_alert("pgd:%s p4d:%s pud:%s\n", pgd_str, p4d_str, pud_str);
 		return;
 	}
 
 	pmdp = pmd_offset(pudp, addr);
 	pmd = pmdp_get(pmdp);
-	pmdv = pmd_val(pmd);
+	ptval_to_str(pmd_str, pmd_val(pmd));
 
 	/*
 	 * Dumping the PTE would be nice, but it's tricky with CONFIG_HIGHPTE,
@@ -567,8 +610,7 @@ static void __print_bad_page_map_pgtable(struct mm_struct *mm, unsigned long add
 	 * doing another map would be bad. print_bad_page_map() should
 	 * already take care of printing the PTE.
 	 */
-	pr_alert("pgd:%08llx p4d:%08llx pud:%08llx pmd:%08llx\n", pgdv,
-		 p4dv, pudv, pmdv);
+	pr_alert("pgd:%s p4d:%s pud:%s pmd:%s\n", pgd_str, p4d_str, pud_str, pmd_str);
 }
 
 /*
@@ -584,10 +626,11 @@ static void __print_bad_page_map_pgtable(struct mm_struct *mm, unsigned long add
  * page table lock.
  */
 static void print_bad_page_map(struct vm_area_struct *vma,
-		unsigned long addr, unsigned long long entry, struct page *page,
-		enum pgtable_level level)
+		unsigned long addr, const void *entry, size_t entry_size,
+		struct page *page, enum pgtable_level level)
 {
 	struct address_space *mapping;
+	char entry_str[PTVAL_STR_MAX];
 	pgoff_t index;
 
 	if (is_bad_page_map_ratelimited())
@@ -596,8 +639,9 @@ static void print_bad_page_map(struct vm_area_struct *vma,
 	mapping = vma->vm_file ? vma->vm_file->f_mapping : NULL;
 	index = linear_page_index(vma, addr);
 
-	pr_alert("BUG: Bad page map in process %s  %s:%08llx", current->comm,
-		 pgtable_level_to_str(level), entry);
+	ptval_bytes_to_hex_str(entry_str, sizeof(entry_str), entry, entry_size);
+	pr_alert("BUG: Bad page map in process %s  %s:%s", current->comm,
+		 pgtable_level_to_str(level), entry_str);
 	__print_bad_page_map_pgtable(vma->vm_mm, addr);
 	if (page)
 		dump_page(page, "bad page map");
@@ -627,8 +671,13 @@ static inline bool pgtable_level_has_pxx_special(enum pgtable_level level)
 	}
 }
 
-#define print_bad_pte(vma, addr, pte, page) \
-	print_bad_page_map(vma, addr, pte_val(pte), page, PGTABLE_LEVEL_PTE)
+static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
+			  pte_t pte, struct page *page)
+{
+	auto entry = pte_val(pte);
+
+	print_bad_page_map(vma, addr, &entry, sizeof(entry), page, PGTABLE_LEVEL_PTE);
+}
 
 /**
  * __vm_normal_page() - Get the "struct page" associated with a page table entry.
@@ -636,8 +685,9 @@ static inline bool pgtable_level_has_pxx_special(enum pgtable_level level)
  * @addr: The address where the page table entry is mapped.
  * @pfn: The PFN stored in the page table entry.
  * @special: Whether the page table entry is marked "special".
- * @level: The page table level for error reporting purposes only.
  * @entry: The page table entry value for error reporting purposes only.
+ * @entry_size: The size of @entry.
+ * @level: The page table level for error reporting purposes only.
  *
  * "Special" mappings do not wish to be associated with a "struct page" (either
  * it doesn't exist, or it exists but they don't want to touch it). In this
@@ -697,7 +747,7 @@ static inline bool pgtable_level_has_pxx_special(enum pgtable_level level)
  */
 static inline struct page *__vm_normal_page(struct vm_area_struct *vma,
 		unsigned long addr, unsigned long pfn, bool special,
-		unsigned long long entry, enum pgtable_level level)
+		const void *entry, size_t entry_size, enum pgtable_level level)
 {
 	if (pgtable_level_has_pxx_special(level)) {
 		if (unlikely(special)) {
@@ -710,7 +760,7 @@ static inline struct page *__vm_normal_page(struct vm_area_struct *vma,
 			if (is_zero_pfn(pfn) || is_huge_zero_pfn(pfn))
 				return NULL;
 
-			print_bad_page_map(vma, addr, entry, NULL, level);
+			print_bad_page_map(vma, addr, entry, entry_size, NULL, level);
 			return NULL;
 		}
 		/*
@@ -741,7 +791,7 @@ static inline struct page *__vm_normal_page(struct vm_area_struct *vma,
 
 	if (unlikely(pfn > highest_memmap_pfn)) {
 		/* Corrupted page table entry. */
-		print_bad_page_map(vma, addr, entry, NULL, level);
+		print_bad_page_map(vma, addr, entry, entry_size, NULL, level);
 		return NULL;
 	}
 	/*
@@ -767,8 +817,10 @@ static inline struct page *__vm_normal_page(struct vm_area_struct *vma,
 struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 			    pte_t pte)
 {
+	auto entry = pte_val(pte);
+
 	return __vm_normal_page(vma, addr, pte_pfn(pte), pte_special(pte),
-				pte_val(pte), PGTABLE_LEVEL_PTE);
+				&entry, sizeof(entry), PGTABLE_LEVEL_PTE);
 }
 
 /**
@@ -809,8 +861,10 @@ struct folio *vm_normal_folio(struct vm_area_struct *vma, unsigned long addr,
 struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
 				pmd_t pmd)
 {
+	auto entry = pmd_val(pmd);
+
 	return __vm_normal_page(vma, addr, pmd_pfn(pmd), pmd_special(pmd),
-				pmd_val(pmd), PGTABLE_LEVEL_PMD);
+				&entry, sizeof(entry), PGTABLE_LEVEL_PMD);
 }
 
 /**
@@ -850,8 +904,10 @@ struct folio *vm_normal_folio_pmd(struct vm_area_struct *vma,
 struct page *vm_normal_page_pud(struct vm_area_struct *vma,
 		unsigned long addr, pud_t pud)
 {
+	auto entry = pud_val(pud);
+
 	return __vm_normal_page(vma, addr, pud_pfn(pud), pud_special(pud),
-				pud_val(pud), PGTABLE_LEVEL_PUD);
+				&entry, sizeof(entry), PGTABLE_LEVEL_PUD);
 }
 #endif
 

gemini-3.1-pro-preview

null

null

							input: 4954
							output: 81
							thoughts: 1100
						

**Analysis of the Memory Management Patch**

Okay, so this patch is touching `mm/memory.c`. My initial scan shows additions of `ptval_bytes_to_hex_str` and `ptval_to_str`, which look like stringification functions or macros. They're being used in `__print_bad_page_map_pgtable` instead of the old `pr_alert` calls with hex formatting. Hmm, `print_bad_page_map` is also modified, now taking `const void *entry, size_t entry_size` rather than a direct `unsigned long long`. The same change is reflected in `print_bad_pte`. And it looks like `__vm_normal_page` and its callers, `vm_normal_page`, `vm_normal_page_pmd`, `vm_normal_page_pud` are also being updated to pass the entry and its size.

Aha! It seems that all these modifications are solely related to how page table entry values are *printed* in error messages, like the ones that trigger `BUG: Bad page map`. The aim is to handle different entry sizes (e.g., 128-bit values) more cleanly and perhaps improve formatting consistency for 32/64 bit entries. The logic within functions like `__vm_normal_page` remains untouched, except for the change in how it passes the entry to `print_bad_page_map`.

Let's do a quick double-check for any functional changes. `ptval_bytes_to_hex_str` is indeed a new function, and `ptval_to_str` is a macro. `__print_bad_page_map_pgtable` uses the formatting functions with `pr_alert`. `print_bad_page_map` also uses them. Interestingly, `print_bad_pte` has changed from a macro to a static void function. The signature of `__vm_normal_page` is changed. The signatures of `vm_normal_page`, `vm_normal_page_pmd`, and `vm_normal_page_pud` remain the same, but their bodies are changed to pass `&entry, sizeof(entry)`.

Okay, but are there any changes to the core kernel execution flow? Nope, this is purely about how error reports are formatted. This part of the code is only ever executed in error cases. The primary purpose is to print an error message, and return NULL or dump page. `__vm_normal_page` returns NULL, this part is unchanged. So no functional change here.

Let me confirm. The prompt says that "Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints" should result in `WorthFuzzing=false`. This patch clearly falls under that category. It's just improving the formatting of how page table entries are displayed in `pr_alert`.

I'll quickly review the diff one last time. `ptval_bytes_to_hex_str` is formatting. `ptval_to_str` is formatting. `__print_bad_page_map_pgtable` is formatting. `print_bad_page_map` is formatting. `print_bad_pte` is formatting, though it also changed to a function. `__vm_normal_page`, `vm_normal_page`, `vm_normal_page_pmd`, `vm_normal_page_pud` are all just updating the arguments for the print.

Yep, it's just decorative changes. I'll set-results with `WorthFuzzing=false`.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies how page table entries are formatted and printed in error messages (e.g., `print_bad_page_map`). It does not alter the functional execution flow of the kernel, as it only affects logging/diagnostic output.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies how page table entries are formatted and printed in error messages (e.g., `print_bad_page_map`). It does not alter the functional execution flow of the kernel, as it only affects logging/diagnostic output.",
  "WorthFuzzing": false
}