syzbot


KCSAN: data-race in do_signal_stop / prepare_signal

Status: auto-closed as invalid on 2021/06/25 01:29
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+60abfb3e5fb112d5a211@syzkaller.appspotmail.com
First crash: 1607d, last: 1033d

Sample crash report:
==================================================================
BUG: KCSAN: data-race in do_signal_stop / prepare_signal

write to 0xffff888140ea606c of 4 bytes by task 8008 on cpu 1:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 do_signal_stop+0x591/0x710 kernel/signal.c:2432
 get_signal+0xa16/0x1610 kernel/signal.c:2770
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888140ea606c of 4 bytes by interrupt on cpu 0:
 sig_task_ignored kernel/signal.c:93 [inline]
 sig_ignored kernel/signal.c:118 [inline]
 prepare_signal+0x952/0xeb0 kernel/signal.c:1001
 send_sigqueue+0xea/0x3e0 kernel/signal.c:1897
 posix_timer_event kernel/time/posix-timers.c:354 [inline]
 posix_timer_fn+0xe8/0x210 kernel/time/posix-timers.c:380
 __run_hrtimer+0x160/0x480 kernel/time/hrtimer.c:1537
 __hrtimer_run_queues kernel/time/hrtimer.c:1601 [inline]
 hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x1c0 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x64/0x80 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
 __init_waitqueue_head+0x0/0x20
 ep_alloc fs/eventpoll.c:943 [inline]
 do_epoll_create+0x11a/0x250 fs/eventpoll.c:1971
 __do_sys_epoll_create1 fs/eventpoll.c:2002 [inline]
 __se_sys_epoll_create1 fs/eventpoll.c:2000 [inline]
 __x64_sys_epoll_create1+0x1a/0x20 fs/eventpoll.c:2000
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8073 Comm: systemd-udevd Not tainted 5.13.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (334):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/05/21 01:28 upstream ba816d3c265c 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/05/17 21:26 upstream d07f6ca923ea a343ba6b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/05/17 08:58 upstream d07f6ca923ea a2eb125d .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/05/15 10:34 upstream 25a1298726e9 93f844de .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/05/14 02:54 upstream 315d99318179 8bdd5343 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/05/08 23:48 upstream b741596468b0 bc5434be .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/05/08 10:36 upstream dd860052c99b bc5434be .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/05/07 04:26 upstream e48661230cc3 06585184 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/04/29 11:30 upstream d72cd4ad4174 77e2b668 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/04/27 10:24 upstream 4a0225c3d208 805b5003 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/04/24 18:15 upstream 2a1d7946fa53 17f0b706 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/04/22 12:47 upstream 16fc44d6387e 33c28d03 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/04/17 07:24 upstream 9cdbf6467424 7e2b734b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/04/12 22:59 upstream 89698becf06d 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/04/11 19:49 upstream 7d900724913c 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/04/10 15:02 upstream d4961772226d 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/04/02 08:26 upstream 1678e493d530 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/04/01 18:39 upstream ffd9fb546d49 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/03/31 19:41 upstream d19cc4bfbff1 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/03/31 06:59 upstream 5e46d1b78a03 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/03/29 21:24 upstream 1e43c377a79f 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/03/23 15:59 upstream 84196390620a e613994b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/03/22 18:45 upstream 0d02ec6b3136 8092f30d .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/03/19 21:17 upstream 8b12a62a4e3e 3d01c4de .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/03/18 03:36 upstream 6417f03132a6 fdb2bb2c .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/03/12 10:28 upstream f78d76e72a46 429d8a6b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/03/09 17:28 upstream 144c79ef3353 26967e35 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/03/04 07:40 upstream f69d02e37a85 d7e4e604 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/03/03 23:51 upstream f69d02e37a85 06ed56cd .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/02/14 00:40 upstream ac30d8ce28d6 98682e5e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/02/10 14:06 upstream e0756cfc7d7c 9c8b8541 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/02/08 13:09 upstream 92bf22614b21 2ce644fc .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/02/06 12:12 upstream 1e0d27fce010 0655e081 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/02/06 03:56 upstream 1e0d27fce010 23a562df .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/02/02 23:59 upstream 3aaf0a27ffc2 624dad51 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/02/01 14:06 upstream 1048ba83fb1c e6b95f32 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/01/30 22:33 upstream 8c947645151c fc9fd31e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/01/19 00:16 upstream 1e2a199f6ccd 63631df1 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/01/18 04:28 upstream 19c329f68089 fd103621 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_signal_stop / prepare_signal
2021/01/15 20:09 upstream 5ee88057889b 65a7a854 .config console log report info ci2-upstream-kcsan-gce
2021/01/15 00:51 upstream 146620506274 468dbb55 .config console log report info ci2-upstream-kcsan-gce
2021/01/14 18:59 upstream 65f0d2414b70 468dbb55 .config console log report info ci2-upstream-kcsan-gce
2021/01/13 21:39 upstream 65f0d2414b70 a945f0a3 .config console log report info ci2-upstream-kcsan-gce
2021/01/13 11:24 upstream e609571b5ffa a945f0a3 .config console log report info ci2-upstream-kcsan-gce
2021/01/12 19:14 upstream e609571b5ffa 0cdd6185 .config console log report info ci2-upstream-kcsan-gce
2020/01/23 15:07 https://github.com/google/ktsan.git kcsan 245a43005292 11ebf937 .config console log report ci2-upstream-kcsan-gce
2020/01/20 11:17 https://github.com/google/ktsan.git kcsan 245a43005292 c40da18c .config console log report ci2-upstream-kcsan-gce
2019/10/24 19:31 https://github.com/google/ktsan.git kcsan 05f2236801fe d01bb02a .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.