KCSAN: data-race in exit_signals / mm_update_next_owner (3)

Status: closed as invalid on 2020/06/18 14:24
Subsystems: kernel
[Documentation on labels]
First crash: 2436d, last: 2299d
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in exit_signals / mm_update_next_owner (4) kernel 6 133 1930d 2132d 0/29 auto-closed as invalid on 2021/07/07 06:50
upstream KCSAN: data-race in exit_signals / mm_update_next_owner kasan 6 2 2511d 2516d 0/29 closed as invalid on 2019/11/19 13:24
upstream KCSAN: data-race in exit_signals / mm_update_next_owner (2) kernel 6 4 2460d 2486d 0/29 closed as invalid on 2020/01/09 14:13

Sample crash report:
==================================================================
BUG: KCSAN: data-race in exit_signals / mm_update_next_owner

write to 0xffff8880954510a4 of 4 bytes by task 23260 on cpu 1:
 exit_signals+0x135/0x4c0 kernel/signal.c:2827
 do_exit+0x17b/0x11e0 kernel/exit.c:744
 do_group_exit+0xae/0x1a0 kernel/exit.c:893
 __do_sys_exit_group kernel/exit.c:904 [inline]
 __se_sys_exit_group kernel/exit.c:902 [inline]
 __x64_sys_exit_group+0x2b/0x30 kernel/exit.c:902
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880954510a4 of 4 bytes by task 23262 on cpu 0:
 mm_update_next_owner+0x376/0x5a0 kernel/exit.c:383
 exit_mm kernel/exit.c:478 [inline]
 do_exit+0x63c/0x11e0 kernel/exit.c:782
 do_group_exit+0xae/0x1a0 kernel/exit.c:893
 __do_sys_exit_group kernel/exit.c:904 [inline]
 __se_sys_exit_group kernel/exit.c:902 [inline]
 __x64_sys_exit_group+0x2b/0x30 kernel/exit.c:902
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23262 Comm: syz-executor.3 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/05/29 19:52 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 bed08304 .config console log report ci2-upstream-kcsan-gce
2020/05/27 20:39 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 9072c126 .config console log report ci2-upstream-kcsan-gce
2020/05/19 04:26 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 684d3606 .config console log report ci2-upstream-kcsan-gce
2020/05/11 09:15 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 f8f57555 .config console log report ci2-upstream-kcsan-gce
2020/05/04 07:36 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 58ae5e18 .config console log report ci2-upstream-kcsan-gce
2020/04/24 07:47 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 03d97a1b .config console log report ci2-upstream-kcsan-gce
2020/04/22 21:49 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2e44d63e .config console log report ci2-upstream-kcsan-gce
2020/04/19 09:45 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 6dfd45e1 .config console log report ci2-upstream-kcsan-gce
2020/03/26 09:16 https://github.com/google/ktsan.git kcsan 40959e34d670 e8e6c7d2 .config console log report ci2-upstream-kcsan-gce
2020/03/25 18:55 https://github.com/google/ktsan.git kcsan 40959e34d670 e8e6c7d2 .config console log report ci2-upstream-kcsan-gce
2020/03/02 15:45 https://github.com/google/ktsan.git kcsan 766d004d1b85 4a4e0509 .config console log report ci2-upstream-kcsan-gce
2020/02/21 08:43 https://github.com/google/ktsan.git kcsan b12d66a6c34f bd2a74a3 .config console log report ci2-upstream-kcsan-gce
2020/02/17 07:55 https://github.com/google/ktsan.git kcsan b12d66a6c34f 1f448cd6 .config console log report ci2-upstream-kcsan-gce
2020/01/19 17:39 https://github.com/google/ktsan.git kcsan 245a43005292 0342f8c7 .config console log report ci2-upstream-kcsan-gce
2020/01/14 01:12 https://github.com/google/ktsan.git kcsan 245a43005292 32881205 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.