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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/mm/debug.c
....@@ -13,10 +13,12 @@
1313 #include <trace/events/mmflags.h>
1414 #include <linux/migrate.h>
1515 #include <linux/page_owner.h>
16
+#include <linux/page_pinner.h>
17
+#include <linux/ctype.h>
1618 
1719 #include "internal.h"
1820 
19
-char *migrate_reason_names[MR_TYPES] = {
21
+const char *migrate_reason_names[MR_TYPES] = {
2022 	"compaction",
2123 	"memory_failure",
2224 	"memory_hotplug",
....@@ -43,8 +45,19 @@
4345 
4446 void __dump_page(struct page *page, const char *reason)
4547 {
48
+	struct page *head = compound_head(page);
49
+	struct address_space *mapping;
4650 	bool page_poisoned = PagePoisoned(page);
51
+	bool compound = PageCompound(page);
52
+	/*
53
+	 * Accessing the pageblock without the zone lock. It could change to
54
+	 * "isolate" again in the meantime, but since we are just dumping the
55
+	 * state for debugging, it should be fine to accept a bit of
56
+	 * inaccuracy here due to racing.
57
+	 */
58
+	bool page_cma = is_migrate_cma_page(page);
4759 	int mapcount;
60
+	char *type = "";
4861 
4962 	/*
5063 	 * If struct page is poisoned don't access Page*() functions as that
....@@ -52,8 +65,28 @@
5265 	 * dump_page() when detected.
5366 	 */
5467 	if (page_poisoned) {
55
-		pr_emerg("page:%px is uninitialized and poisoned", page);
68
+		pr_warn("page:%px is uninitialized and poisoned", page);
5669 		goto hex_only;
70
+	}
71
+
72
+	if (page < head || (page >= head + MAX_ORDER_NR_PAGES)) {
73
+		/*
74
+		 * Corrupt page, so we cannot call page_mapping. Instead, do a
75
+		 * safe subset of the steps that page_mapping() does. Caution:
76
+		 * this will be misleading for tail pages, PageSwapCache pages,
77
+		 * and potentially other situations. (See the page_mapping()
78
+		 * implementation for what's missing here.)
79
+		 */
80
+		unsigned long tmp = (unsigned long)page->mapping;
81
+
82
+		if (tmp & PAGE_MAPPING_ANON)
83
+			mapping = NULL;
84
+		else
85
+			mapping = (void *)(tmp & ~PAGE_MAPPING_FLAGS);
86
+		head = page;
87
+		compound = false;
88
+	} else {
89
+		mapping = page_mapping(page);
5790 	}
5891 
5992 	/*
....@@ -61,29 +94,97 @@
6194 	 * page->_mapcount space in struct page is used by sl[aou]b pages to
6295 	 * encode own info.
6396 	 */
64
-	mapcount = PageSlab(page) ? 0 : page_mapcount(page);
97
+	mapcount = PageSlab(head) ? 0 : page_mapcount(page);
6598 
66
-	pr_emerg("page:%px count:%d mapcount:%d mapping:%px index:%#lx",
67
-		  page, page_ref_count(page), mapcount,
68
-		  page->mapping, page_to_pgoff(page));
69
-	if (PageCompound(page))
70
-		pr_cont(" compound_mapcount: %d", compound_mapcount(page));
71
-	pr_cont("\n");
99
+	pr_warn("page:%p refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n",
100
+			page, page_ref_count(head), mapcount, mapping,
101
+			page_to_pgoff(page), page_to_pfn(page));
102
+	if (compound) {
103
+		if (hpage_pincount_available(page)) {
104
+			pr_warn("head:%p order:%u compound_mapcount:%d compound_pincount:%d\n",
105
+					head, compound_order(head),
106
+					head_compound_mapcount(head),
107
+					head_compound_pincount(head));
108
+		} else {
109
+			pr_warn("head:%p order:%u compound_mapcount:%d\n",
110
+					head, compound_order(head),
111
+					head_compound_mapcount(head));
112
+		}
113
+	}
114
+	if (PageKsm(page))
115
+		type = "ksm ";
116
+	else if (PageAnon(page))
117
+		type = "anon ";
118
+	else if (mapping) {
119
+		struct inode *host;
120
+		const struct address_space_operations *a_ops;
121
+		struct hlist_node *dentry_first;
122
+		struct dentry *dentry_ptr;
123
+		struct dentry dentry;
124
+		unsigned long ino;
125
+
126
+		/*
127
+		 * mapping can be invalid pointer and we don't want to crash
128
+		 * accessing it, so probe everything depending on it carefully
129
+		 */
130
+		if (get_kernel_nofault(host, &mapping->host) ||
131
+		    get_kernel_nofault(a_ops, &mapping->a_ops)) {
132
+			pr_warn("failed to read mapping contents, not a valid kernel address?\n");
133
+			goto out_mapping;
134
+		}
135
+
136
+		if (!host) {
137
+			pr_warn("aops:%ps\n", a_ops);
138
+			goto out_mapping;
139
+		}
140
+
141
+		if (get_kernel_nofault(dentry_first, &host->i_dentry.first) ||
142
+		    get_kernel_nofault(ino, &host->i_ino)) {
143
+			pr_warn("aops:%ps with invalid host inode %px\n",
144
+					a_ops, host);
145
+			goto out_mapping;
146
+		}
147
+
148
+		if (!dentry_first) {
149
+			pr_warn("aops:%ps ino:%lx\n", a_ops, ino);
150
+			goto out_mapping;
151
+		}
152
+
153
+		dentry_ptr = container_of(dentry_first, struct dentry, d_u.d_alias);
154
+		if (get_kernel_nofault(dentry, dentry_ptr)) {
155
+			pr_warn("aops:%ps ino:%lx with invalid dentry %px\n",
156
+					a_ops, ino, dentry_ptr);
157
+		} else {
158
+			/*
159
+			 * if dentry is corrupted, the %pd handler may still
160
+			 * crash, but it's unlikely that we reach here with a
161
+			 * corrupted struct page
162
+			 */
163
+			pr_warn("aops:%ps ino:%lx dentry name:\"%pd\"\n",
164
+					a_ops, ino, &dentry);
165
+		}
166
+	}
167
+out_mapping:
72168 	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
73169 
74
-	pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
170
+	pr_warn("%sflags: %#lx(%pGp)%s\n", type, head->flags, &head->flags,
171
+		page_cma ? " CMA" : "");
75172 
76173 hex_only:
77
-	print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32,
174
+	print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32,
78175 			sizeof(unsigned long), page,
176
+			sizeof(struct page), false);
177
+	if (head != page)
178
+		print_hex_dump(KERN_WARNING, "head: ", DUMP_PREFIX_NONE, 32,
179
+			sizeof(unsigned long), head,
79180 			sizeof(struct page), false);
80181 
81182 	if (reason)
82
-		pr_alert("page dumped because: %s\n", reason);
183
+		pr_warn("page dumped because: %s\n", reason);
83184 
84185 #ifdef CONFIG_MEMCG
85186 	if (!page_poisoned && page->mem_cgroup)
86
-		pr_alert("page->mem_cgroup:%px\n", page->mem_cgroup);
187
+		pr_warn("page->mem_cgroup:%px\n", page->mem_cgroup);
87188 #endif
88189 }
89190 
....@@ -91,6 +192,7 @@
91192 {
92193 	__dump_page(page, reason);
93194 	dump_page_owner(page);
195
+	dump_page_pinner(page);
94196 }
95197 EXPORT_SYMBOL(dump_page);
96198 
....@@ -121,7 +223,7 @@
121223 		"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
122224 		"pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
123225 		"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
124
-		"pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
226
+		"pinned_vm %llx data_vm %lx exec_vm %lx stack_vm %lx\n"
125227 		"start_code %lx end_code %lx start_data %lx end_data %lx\n"
126228 		"start_brk %lx brk %lx start_stack %lx\n"
127229 		"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
....@@ -134,7 +236,7 @@
134236 #endif
135237 		"exe_file %px\n"
136238 #ifdef CONFIG_MMU_NOTIFIER
137
-		"mmu_notifier_mm %px\n"
239
+		"notifier_subscriptions %px\n"
138240 #endif
139241 #ifdef CONFIG_NUMA_BALANCING
140242 		"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
....@@ -152,7 +254,8 @@
152254 		mm_pgtables_bytes(mm),
153255 		mm->map_count,
154256 		mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
155
-		mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
257
+		(u64)atomic64_read(&mm->pinned_vm),
258
+		mm->data_vm, mm->exec_vm, mm->stack_vm,
156259 		mm->start_code, mm->end_code, mm->start_data, mm->end_data,
157260 		mm->start_brk, mm->brk, mm->start_stack,
158261 		mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
....@@ -165,7 +268,7 @@
165268 #endif
166269 		mm->exe_file,
167270 #ifdef CONFIG_MMU_NOTIFIER
168
-		mm->mmu_notifier_mm,
271
+		mm->notifier_subscriptions,
169272 #endif
170273 #ifdef CONFIG_NUMA_BALANCING
171274 		mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
....@@ -175,4 +278,49 @@
175278 	);
176279 }
177280 
281
+static bool page_init_poisoning __read_mostly = true;
282
+
283
+static int __init setup_vm_debug(char *str)
284
+{
285
+	bool __page_init_poisoning = true;
286
+
287
+	/*
288
+	 * Calling vm_debug with no arguments is equivalent to requesting
289
+	 * to enable all debugging options we can control.
290
+	 */
291
+	if (*str++ != '=' || !*str)
292
+		goto out;
293
+
294
+	__page_init_poisoning = false;
295
+	if (*str == '-')
296
+		goto out;
297
+
298
+	while (*str) {
299
+		switch (tolower(*str)) {
300
+		case'p':
301
+			__page_init_poisoning = true;
302
+			break;
303
+		default:
304
+			pr_err("vm_debug option '%c' unknown. skipped\n",
305
+			       *str);
306
+		}
307
+
308
+		str++;
309
+	}
310
+out:
311
+	if (page_init_poisoning && !__page_init_poisoning)
312
+		pr_warn("Page struct poisoning disabled by kernel command line option 'vm_debug'\n");
313
+
314
+	page_init_poisoning = __page_init_poisoning;
315
+
316
+	return 1;
317
+}
318
+__setup("vm_debug", setup_vm_debug);
319
+
320
+void page_init_poison(struct page *page, size_t size)
321
+{
322
+	if (page_init_poisoning)
323
+		memset(page, PAGE_POISON_PATTERN, size);
324
+}
325
+EXPORT_SYMBOL_GPL(page_init_poison);
178326 #endif		/* CONFIG_DEBUG_VM */