KCSAN: data-race in schedule_hrtimeout_range_clock / watchdog (2)

Status: closed as invalid on 2020/06/18 14:24
Subsystems: kernel
[Documentation on labels]
First crash: 2436d, last: 2272d
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in schedule_hrtimeout_range_clock / watchdog kernel 6 1 2486d 2486d 0/29 closed as invalid on 2019/11/19 13:44

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

write to 0xffff888124894090 of 8 bytes by task 8899 on cpu 1:
 schedule_hrtimeout_range_clock+0x14f/0x1f0 kernel/time/hrtimer.c:2142
 schedule_hrtimeout_range+0x30/0x50 kernel/time/hrtimer.c:2182
 poll_schedule_timeout.constprop.0+0x71/0xc0 fs/select.c:243
 do_select+0xd7e/0x1020 fs/select.c:603
 core_sys_select+0x2c7/0x5f0 fs/select.c:677
 do_pselect.constprop.0+0x125/0x160 fs/select.c:759
 __do_sys_pselect6 fs/select.c:784 [inline]
 __se_sys_pselect6 fs/select.c:769 [inline]
 __x64_sys_pselect6+0x12a/0x160 fs/select.c:769
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888124894090 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
==================================================================

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/05/26 23:32 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 9072c126 .config console log report ci2-upstream-kcsan-gce
2020/05/14 14:38 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2d572622 .config console log report ci2-upstream-kcsan-gce
2020/05/12 09:35 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 a497a5b4 .config console log report ci2-upstream-kcsan-gce
2020/03/10 15:54 https://github.com/google/ktsan.git kcsan 941e0d917bbf 35f53e45 .config console log report ci2-upstream-kcsan-gce
2020/03/04 15:09 https://github.com/google/ktsan.git kcsan 766d004d1b85 712198ac .config console log report ci2-upstream-kcsan-gce
2020/02/11 22:24 https://github.com/google/ktsan.git kcsan f60f0f543333 4d1ab643 .config console log report ci2-upstream-kcsan-gce
2020/02/01 13:34 https://github.com/google/ktsan.git kcsan 245a43005292 326d4c78 .config console log report ci2-upstream-kcsan-gce
2020/01/08 01:50 https://github.com/google/ktsan.git kcsan 245a43005292 6738e0b3 .config console log report ci2-upstream-kcsan-gce
2019/12/14 18:10 https://github.com/google/ktsan.git kcsan 245a43005292 eef6e580 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.