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KCSAN: data-race in do_wait / watchdog

Status: closed as invalid on 2020/06/18 14:24
Subsystems: kasan
[Documentation on labels]
First crash: 1638d, last: 1420d

Sample crash report:
==================================================================
BUG: KCSAN: data-race in do_wait / watchdog

write to 0xffff8880b1c0b090 of 8 bytes by task 9391 on cpu 1:
 do_wait+0x1f7/0x4c0 kernel/exit.c:1462
 kernel_wait4+0x146/0x230 kernel/exit.c:1611
 __do_sys_wait4+0xea/0x100 kernel/exit.c:1623
 __se_sys_wait4 kernel/exit.c:1619 [inline]
 __x64_sys_wait4+0x59/0x70 kernel/exit.c:1619
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b1c0b090 of 8 bytes by task 1925 on cpu 0:
 check_hung_uninterruptible_tasks kernel/hung_task.c:197 [inline]
 watchdog+0x2b8/0x960 kernel/hung_task.c:289
 kthread+0x203/0x230 kernel/kthread.c:268
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1925 Comm: khungtaskd Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 1925 Comm: khungtaskd Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x11d/0x187 lib/dump_stack.c:118
 panic+0x210/0x640 kernel/panic.c:221
 kcsan_report.cold+0xc/0x1a kernel/kcsan/report.c:626
 kcsan_setup_watchpoint+0x3fb/0x440 kernel/kcsan/core.c:519
 check_hung_uninterruptible_tasks kernel/hung_task.c:197 [inline]
 watchdog+0x2b8/0x960 kernel/hung_task.c:289
 kthread+0x203/0x230 kernel/kthread.c:268
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (26):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/05/29 07:53 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 d19ed305 .config console log report ci2-upstream-kcsan-gce
2020/03/28 11:59 https://github.com/google/ktsan.git kcsan 40959e34d670 f1ebdfba .config console log report ci2-upstream-kcsan-gce
2020/02/02 12:51 https://github.com/google/ktsan.git kcsan 245a43005292 93e5e335 .config console log report ci2-upstream-kcsan-gce
2020/01/29 22:56 https://github.com/google/ktsan.git kcsan 245a43005292 5ed23f9a .config console log report ci2-upstream-kcsan-gce
2020/01/21 13:00 https://github.com/google/ktsan.git kcsan 245a43005292 8eda0b95 .config console log report ci2-upstream-kcsan-gce
2020/01/15 20:23 https://github.com/google/ktsan.git kcsan 245a43005292 f9b69507 .config console log report ci2-upstream-kcsan-gce
2020/01/10 00:24 https://github.com/google/ktsan.git kcsan 245a43005292 4de4e9f0 .config console log report ci2-upstream-kcsan-gce
2020/01/08 19:51 https://github.com/google/ktsan.git kcsan 245a43005292 ddc3e859 .config console log report ci2-upstream-kcsan-gce
2020/01/07 04:26 https://github.com/google/ktsan.git kcsan 245a43005292 53430d97 .config console log report ci2-upstream-kcsan-gce
2020/01/03 20:12 https://github.com/google/ktsan.git kcsan 245a43005292 9dcc1191 .config console log report ci2-upstream-kcsan-gce
2019/12/31 03:37 https://github.com/google/ktsan.git kcsan 245a43005292 6b36d338 .config console log report ci2-upstream-kcsan-gce
2019/12/29 14:37 https://github.com/google/ktsan.git kcsan 245a43005292 af6b8ef8 .config console log report ci2-upstream-kcsan-gce
2019/12/22 20:10 https://github.com/google/ktsan.git kcsan 245a43005292 8b967267 .config console log report ci2-upstream-kcsan-gce
2019/12/21 20:42 https://github.com/google/ktsan.git kcsan 245a43005292 bc586918 .config console log report ci2-upstream-kcsan-gce
2019/12/20 03:41 https://github.com/google/ktsan.git kcsan 245a43005292 36650b4b .config console log report ci2-upstream-kcsan-gce
2019/12/02 20:20 https://github.com/google/ktsan.git kcsan ef798c30ba4e ab342da3 .config console log report ci2-upstream-kcsan-gce
2019/12/01 12:20 https://github.com/google/ktsan.git kcsan ef798c30ba4e a76bf83f .config console log report ci2-upstream-kcsan-gce
2019/11/30 02:08 https://github.com/google/ktsan.git kcsan ef798c30ba4e 3a75be00 .config console log report ci2-upstream-kcsan-gce
2019/11/26 22:53 https://github.com/google/ktsan.git kcsan ef798c30ba4e 1048481f .config console log report ci2-upstream-kcsan-gce
2019/11/20 17:13 https://github.com/google/ktsan.git kcsan 5863cc791e4c 432c7650 .config console log report ci2-upstream-kcsan-gce
2019/11/16 06:51 https://github.com/google/ktsan.git kcsan 5863cc791e4c cdac920b .config console log report ci2-upstream-kcsan-gce
2019/11/14 16:30 https://github.com/google/ktsan.git kcsan 7f2955e0d056 048f2d49 .config console log report ci2-upstream-kcsan-gce
2019/11/09 22:55 https://github.com/google/ktsan.git kcsan 94c006602e13 dc438b91 .config console log report ci2-upstream-kcsan-gce
2019/11/01 21:56 https://github.com/google/ktsan.git kcsan 05f2236801fe 997ccc67 .config console log report ci2-upstream-kcsan-gce
2019/10/28 16:47 https://github.com/google/ktsan.git kcsan 05f2236801fe 439d7b14 .config console log report ci2-upstream-kcsan-gce
2019/10/23 16:46 https://github.com/google/ktsan.git kcsan 05f2236801fe b602d64b .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.