KCSAN: data-race in file_update_time_flags / inode_update

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
aa8100c8-8541-4938-8e7c-558e819b861b	assessment-kcsan	Benign: ✅ Confident: ✅	❓	KCSAN: data-race in file_update_time_flags / inode_update_timestamps	2026/02/24 19:18	2026/02/24 19:18	2026/02/24 19:28	305c0ec5cd886e2d13738e28e1b2df9b0ec20fc9
86318e49-9b1d-4b58-9f4e-f7b307671ef8	assessment-kcsan		💥	KCSAN: data-race in file_update_time_flags / inode_update_timestamps	2026/01/10 00:03	2026/01/10 00:03	2026/01/10 00:22	7519916073b761ced56a7b15fdeeb4674e8dc125	Error 429, Message: You exceeded your current quota, please check your plan and billing details. For more information on this error, head to: https://ai.google.dev/gemini-api/docs/rate-limits. To monitor your current usage, head to: https://ai.dev/rate-limit. * Quota exceeded for metric: generativelanguage.googleapis.com/generate_requests_per_model_per_day, limit: 0, Status: RESOURCE_EXHAUSTED, Details: [map[@type:type.googleapis.com/google.rpc.Help links:[map[description:Learn more about Gemini API quotas url:https://ai.google.dev/gemini-api/docs/rate-limits]]] map[@type:type.googleapis.com/google.rpc.QuotaFailure violations:[map[quotaId:GenerateRequestsPerDayPerProjectPerModel quotaMetric:generativelanguage.googleapis.com/generate_requests_per_model_per_day]]] map[@type:type.googleapis.com/google.rpc.DebugInfo detail:[ORIGINAL ERROR] generic::resource_exhausted: You exceeded your current quota, please check your plan and billing details. For more information on this error, head to: https://ai.google.dev/gemini-api/docs/rate-limits. To monitor your current usage, head to: https://ai.dev/rate-limit. * Quota exceeded for metric: generativelanguage.googleapis.com/generate_requests_per_model_per_day, limit: 0 [google.rpc.error_details_ext] { message: "You exceeded your current quota, please check your plan and billing details. For more information on this error, head to: https://ai.google.dev/gemini-api/docs/rate-limits. To monitor your current usage, head to: https://ai.dev/rate-limit. \n* Quota exceeded for metric: generativelanguage.googleapis.com/generate_requests_per_model_per_day, limit: 0" details { type_url: "type.googleapis.com/language_labs.genai.debug.GeminiApiDebugInfo" value: "RM\nK\nEgenerativelanguage.googleapis.com/generate_requests_per_model_per_day\030\000\"\000" } details { [type.googleapis.com/google.rpc.Help] { links { description: "Learn more about Gemini API quotas" url: "https://ai.google.dev/gemini-api/docs/rate-limits" } } } details { [type.googleapis.com/google.rpc.QuotaFailure] { violations { quota_metric: "generativelanguage.googleapis.com/generate_requests_per_model_per_day" quota_id: "GenerateRequestsPerDayPerProjectPerModel" } } } }]]

================================================================== BUG: KCSAN: data-race in file_update_time_flags / inode_update_timestamps write to 0xffff888100405884 of 4 bytes by task 15577 on cpu 1: inode_set_mtime_to_ts include/linux/fs.h:1658 [inline] inode_update_timestamps+0x147/0x270 fs/inode.c:2113 generic_update_time fs/inode.c:2148 [inline] inode_update_time fs/inode.c:2168 [inline] file_update_time_flags+0x26c/0x310 fs/inode.c:2395 file_update_time+0x17/0x20 fs/inode.c:2416 fault_dirty_shared_page+0xd9/0x390 mm/memory.c:3570 do_shared_fault mm/memory.c:5847 [inline] do_fault mm/memory.c:5893 [inline] do_pte_missing mm/memory.c:4401 [inline] handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x1690/0x2c60 mm/memory.c:6580 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1024/0x1ed0 mm/gup.c:1428 __get_user_pages_locked mm/gup.c:1692 [inline] __gup_longterm_locked+0x8ef/0xe60 mm/gup.c:2476 pin_user_pages_remote+0x7e/0xb0 mm/gup.c:3363 process_vm_rw_single_vec mm/process_vm_access.c:106 [inline] process_vm_rw_core mm/process_vm_access.c:216 [inline] process_vm_rw+0x484/0x960 mm/process_vm_access.c:284 __do_sys_process_vm_writev mm/process_vm_access.c:304 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:299 [inline] __x64_sys_process_vm_writev+0x78/0x90 mm/process_vm_access.c:299 x64_sys_call+0x27ef/0x3000 arch/x86/include/generated/asm/syscalls_64.h:312 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888100405884 of 4 bytes by task 15589 on cpu 0: inode_get_mtime_nsec include/linux/fs.h:1644 [inline] inode_get_mtime include/linux/fs.h:1650 [inline] file_update_time_flags+0xad/0x310 fs/inode.c:2378 file_update_time+0x17/0x20 fs/inode.c:2416 fault_dirty_shared_page+0xd9/0x390 mm/memory.c:3570 do_shared_fault mm/memory.c:5847 [inline] do_fault mm/memory.c:5893 [inline] do_pte_missing mm/memory.c:4401 [inline] handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x1690/0x2c60 mm/memory.c:6580 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1024/0x1ed0 mm/gup.c:1428 __get_user_pages_locked mm/gup.c:1692 [inline] faultin_page_range+0x107/0x4e0 mm/gup.c:1912 madvise_populate mm/madvise.c:976 [inline] madvise_do_behavior+0x1a0/0xa20 mm/madvise.c:1935 do_madvise+0x10e/0x190 mm/madvise.c:2030 __do_sys_madvise mm/madvise.c:2039 [inline] __se_sys_madvise mm/madvise.c:2037 [inline] __x64_sys_madvise+0x64/0x80 mm/madvise.c:2037 x64_sys_call+0x1c6b/0x3000 arch/x86/include/generated/asm/syscalls_64.h:29 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x17292c2c -> 0x17c1c2ac Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 15589 Comm: syz.4.9709 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ==================================================================

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/01/03 07:23	upstream	9b0436804460	d6526ea3	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in file_update_time_flags / inode_update_timestamps
2025/12/14 15:42	upstream	8f0b4cce4481	d6526ea3	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in file_update_time_flags / inode_update_timestamps

Crashes (2):

Assets (help?)