KCSAN: data-race in ep_poll_callback / ep_try_send

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
8054189f-1179-42cc-a2b5-4f8899fc0b76	assessment-kcsan	Benign: ✅ Confident: ✅	❓	KCSAN: data-race in ep_poll_callback / ep_try_send_events (2)	2026/02/24 19:52	2026/02/24 19:52	2026/02/24 19:55	305c0ec5cd886e2d13738e28e1b2df9b0ec20fc9
c1b6516c-de9c-405d-bde0-80a07a7363cf	assessment-kcsan		💥	KCSAN: data-race in ep_poll_callback / ep_try_send_events (2)	2026/01/10 02:16	2026/01/10 02:16	2026/01/10 02:16	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" } } } }]]

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ep_poll_callback / ep_try_send_events fs	6				1	283d	283d	0/29	auto-obsoleted due to no activity on 2025/07/21 19:13

Kernel

Title

Rank 🛈

upstream

KCSAN: data-race in ep_poll_callback / ep_try_send_events fs

283d

0/29

auto-obsoleted due to no activity on 2025/07/21 19:13

================================================================== BUG: KCSAN: data-race in ep_poll_callback / ep_try_send_events write to 0xffff8881262813e8 of 4 bytes by task 11821 on cpu 0: ep_send_events fs/eventpoll.c:1832 [inline] ep_try_send_events+0x510/0x730 fs/eventpoll.c:1905 ep_poll fs/eventpoll.c:1970 [inline] do_epoll_wait+0x371/0x950 fs/eventpoll.c:2461 do_epoll_pwait+0x54/0x150 fs/eventpoll.c:2491 __do_sys_epoll_pwait fs/eventpoll.c:2504 [inline] __se_sys_epoll_pwait fs/eventpoll.c:2498 [inline] __x64_sys_epoll_pwait+0x194/0x1c0 fs/eventpoll.c:2498 x64_sys_call+0x153d/0x3000 arch/x86/include/generated/asm/syscalls_64.h:282 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff8881262813e8 of 4 bytes by task 11824 on cpu 1: ep_poll_callback+0x4a7/0x580 fs/eventpoll.c:1332 __wake_up_common kernel/sched/wait.c:108 [inline] __wake_up_common_lock kernel/sched/wait.c:125 [inline] __wake_up_sync_key+0x52/0x80 kernel/sched/wait.c:192 unix_write_space+0xcf/0x140 net/unix/af_unix.c:605 sock_wfree+0x149/0x3a0 net/core/sock.c:2693 unix_destruct_scm+0xcd/0x100 net/unix/af_unix.c:1980 skb_release_head_state+0x261/0x270 net/core/skbuff.c:1160 skb_release_all net/core/skbuff.c:1180 [inline] __kfree_skb+0x18/0x150 net/core/skbuff.c:1196 sk_skb_reason_drop+0xbd/0x260 net/core/skbuff.c:1234 kfree_skb_reason include/linux/skbuff.h:1322 [inline] unix_release_sock+0x62e/0x750 net/unix/af_unix.c:726 unix_release+0x58/0x80 net/unix/af_unix.c:1184 __sock_release net/socket.c:662 [inline] sock_close+0x6b/0x150 net/socket.c:1455 __fput+0x29b/0x650 fs/file_table.c:468 fput_close_sync+0xad/0x190 fs/file_table.c:573 __do_sys_close fs/open.c:1573 [inline] __se_sys_close fs/open.c:1558 [inline] __x64_sys_close+0x55/0xf0 fs/open.c:1558 x64_sys_call+0x2c25/0x3000 arch/x86/include/generated/asm/syscalls_64.h:4 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0xe000201d -> 0xe0000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 11824 Comm: syz.0.1858 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 ==================================================================

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/02/08 08:55	upstream	e7aa57247700	4c131dc4	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in ep_poll_callback / ep_try_send_events
2026/01/09 19:50	upstream	372800cb95a3	d6526ea3	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in ep_poll_callback / ep_try_send_events

Crashes (2):

Assets (help?)