syzbot


KCSAN: data-race in complete_signal / futex_wait_queue_me (3)

Status: auto-closed as invalid on 2021/07/07 04:16
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+be5052a878945fd5a0a0@syzkaller.appspotmail.com
First crash: 1369d, last: 1020d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in complete_signal / futex_wait_queue_me kernel 2 1589d 1594d 0/26 closed as invalid on 2019/11/19 14:54
upstream KCSAN: data-race in complete_signal / futex_wait_queue_me (2) kernel 18 1370d 1502d 0/26 closed as invalid on 2020/06/18 14:24

Sample crash report:
==================================================================
BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me

write to 0xffff888100bdf02c of 4 bytes by task 1751 on cpu 0:
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 freezable_schedule include/linux/freezer.h:171 [inline]
 futex_wait_queue_me+0x198/0x260 kernel/futex.c:2606
 futex_wait+0x143/0x430 kernel/futex.c:2708
 do_futex+0x9d8/0x1ee0 kernel/futex.c:3732
 __do_sys_futex kernel/futex.c:3805 [inline]
 __se_sys_futex+0x21c/0x380 kernel/futex.c:3786
 __x64_sys_futex+0x74/0x80 kernel/futex.c:3786
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888100bdf02c of 4 bytes by task 1757 on cpu 1:
 wants_signal kernel/signal.c:1017 [inline]
 complete_signal+0x7c/0x600 kernel/signal.c:1040
 __send_signal+0x680/0x760 kernel/signal.c:1221
 send_signal+0x281/0x390 kernel/signal.c:1284
 do_send_sig_info kernel/signal.c:1333 [inline]
 do_send_specific+0x13d/0x1c0 kernel/signal.c:3881
 do_tkill kernel/signal.c:3907 [inline]
 __do_sys_tgkill kernel/signal.c:3926 [inline]
 __se_sys_tgkill kernel/signal.c:3920 [inline]
 __x64_sys_tgkill+0x108/0x140 kernel/signal.c:3920
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00404040 -> 0x40404040

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1757 Comm: syz-fuzzer Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (373):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/06/02 04:15 upstream 231bc5390667 032639db .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/28 19:12 upstream 5ff2756afde0 858ea628 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/25 02:57 upstream 1434a3127887 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/23 23:17 upstream 6ebb6814a1ef 3c7fef33 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/15 07:43 upstream 25a1298726e9 8bdd5343 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/12 18:13 upstream dbb5afad100a 86294427 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/11 20:04 upstream 88b06399c9c7 b3c3bb8e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/10 12:37 upstream 6efb943b8616 ca873091 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/09 21:32 upstream 9819f682e48c bc5434be .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/07 04:18 upstream e48661230cc3 06585184 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/06 10:38 upstream 8404c9fbc84b 06c27ff5 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/04 13:50 upstream 5e321ded302d 06c27ff5 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/03 13:25 upstream 9ccce092fc64 ad61f371 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/05/01 09:48 upstream 9f67672a817e 77e2b668 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/29 23:49 upstream 8ca5297e7e38 77e2b668 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/28 21:09 upstream 68a32ba14177 77e2b668 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/26 23:38 upstream 9f4ad9e425a1 8ee2dea6 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/26 09:42 upstream 9f4ad9e425a1 805b5003 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/25 17:36 upstream d2d09fbe33f8 36c88236 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/25 08:19 upstream 2a1d7946fa53 36c88236 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/23 12:39 upstream 18a3c5f7abfd 17f0b706 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/21 08:33 upstream 1fe5501ba1ab 95777977 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/20 08:01 upstream 7af08140979a c0ced557 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/19 22:30 upstream 7af08140979a 4285c989 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/17 20:37 upstream 194cf4825638 7e2b734b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/16 12:24 upstream 7e25f40eab52 7e2b734b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/15 16:40 upstream 7f75285ca572 c59079a6 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/14 23:38 upstream 7f75285ca572 fcdb12ba .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/14 10:26 upstream 50987beca096 3134b37f .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/13 20:20 upstream 89698becf06d a184b83e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/12 23:13 upstream 89698becf06d 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/05 18:28 upstream 0a50438c8436 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/03 13:56 upstream d93a0d43e3d0 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/02 09:01 upstream 1678e493d530 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/04/01 18:39 upstream ffd9fb546d49 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/03/31 06:41 upstream 5e46d1b78a03 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/03/29 20:14 upstream 1e43c377a79f 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/03/28 20:53 upstream 36a14638f7c0 a8529b82 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/03/26 11:49 upstream db24726bfefa a8529b82 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/03/25 21:56 upstream 002322402daf 6a383ecf .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/03/23 16:03 upstream 84196390620a e613994b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/03/22 03:27 upstream 5ee96fa9dd78 bea32f74 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/03/21 23:25 upstream 5ee96fa9dd78 4c9a64da .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/03/21 14:33 upstream 812da4d39463 4c9a64da .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in complete_signal / futex_wait_queue_me
2021/01/16 20:35 upstream 54c6247d06f1 65a7a854 .config console log report info ci2-upstream-kcsan-gce
2020/07/03 12:02 upstream cdd3bb54332f 6e569755 .config console log report ci2-upstream-kcsan-gce
2020/06/30 18:59 upstream 7c30b859a947 917afeaa .config console log report ci2-upstream-kcsan-gce
2020/06/19 03:27 upstream 5e857ce6eae7 bc258b50 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.