syzbot


KCSAN: data-race in do_nanosleep / do_signal_stop (4)

Status: auto-closed as invalid on 2021/03/19 19:09
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+6d31bb7ecfb11f3746b6@syzkaller.appspotmail.com
First crash: 1203d, last: 1130d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in do_nanosleep / do_signal_stop (3) kernel 2 1273d 1280d 0/26 auto-closed as invalid on 2020/10/28 06:21
upstream KCSAN: data-race in do_nanosleep / do_signal_stop (2) kernel 1 1319d 1319d 0/26 auto-closed as invalid on 2020/09/12 00:48
upstream KCSAN: data-race in do_nanosleep / do_signal_stop (5) kernel 5 1024d 1085d 0/26 auto-closed as invalid on 2021/07/04 06:35
upstream KCSAN: data-race in do_nanosleep / do_signal_stop kernel 1 1368d 1368d 0/26 auto-closed as invalid on 2020/07/25 10:53

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

write to 0xffff88810a9f302c of 4 bytes by task 14025 on cpu 0:
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 freezable_schedule include/linux/freezer.h:171 [inline]
 do_nanosleep+0xff/0x3d0 kernel/time/hrtimer.c:1878
 hrtimer_nanosleep_restart+0x57/0x80 kernel/time/hrtimer.c:1912
 __do_sys_restart_syscall+0x2a/0x30 kernel/signal.c:2913
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810a9f302c of 4 bytes by task 14077 on cpu 1:
 task_set_jobctl_pending kernel/signal.c:291 [inline]
 do_signal_stop+0x33e/0x6e0 kernel/signal.c:2355
 get_signal+0x65d/0x14e0 kernel/signal.c:2733
 arch_do_signal_or_restart+0x2a/0x270 arch/x86/kernel/signal.c:811
 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+0x11a/0x1b0 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:294
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14077 Comm: syz-executor.2 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/02/12 19:08 upstream dcc0b49040c7 98682e5e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_nanosleep / do_signal_stop
2021/02/01 02:27 upstream 1048ba83fb1c fc9fd31e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_nanosleep / do_signal_stop
2020/12/28 21:00 upstream c76e02c59e13 8259d56c .config console log report info ci2-upstream-kcsan-gce
2020/12/14 06:50 upstream 2c85ebc57b3e b22a7ec3 .config console log report info ci2-upstream-kcsan-gce
2020/12/01 23:41 upstream b65054597872 c42a35e9 .config console log report info ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.