KCSAN: data-race in do_nanosleep / get_task_mm (2)

Status: auto-closed as invalid on 2020/05/15 17:56
Subsystems: kernel
[Documentation on labels]
First crash: 2452d, last: 2354d
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in do_nanosleep / get_task_mm kernel 6 3 2475d 2479d 0/29 closed as invalid on 2019/11/19 13:54
upstream KCSAN: data-race in do_nanosleep / get_task_mm (4) kernel 6 2 2131d 2147d 0/29 auto-closed as invalid on 2020/11/19 20:31
upstream KCSAN: data-race in do_nanosleep / get_task_mm (3) kernel 6 1 2238d 2238d 0/29 auto-closed as invalid on 2020/08/04 14:55

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

write to 0xffff888101dd0064 of 4 bytes by task 7799 on cpu 0:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 do_nanosleep+0x14d/0x320 kernel/time/hrtimer.c:1874
 hrtimer_nanosleep+0x136/0x230 kernel/time/hrtimer.c:1927
 __do_sys_nanosleep kernel/time/hrtimer.c:1961 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1948 [inline]
 __x64_sys_nanosleep+0x14b/0x190 kernel/time/hrtimer.c:1948
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888101dd0064 of 4 bytes by task 32454 on cpu 1:
 get_task_mm+0x4b/0x90 kernel/fork.c:1218
 get_task_cmdline fs/proc/base.c:348 [inline]
 proc_pid_cmdline_read+0x98/0x700 fs/proc/base.c:368
 __vfs_read+0x58/0xb0 fs/read_write.c:425
 vfs_read fs/read_write.c:461 [inline]
 vfs_read+0x13e/0x2b0 fs/read_write.c:446
 ksys_read+0xc5/0x1a0 fs/read_write.c:587
 __do_sys_read fs/read_write.c:597 [inline]
 __se_sys_read fs/read_write.c:595 [inline]
 __x64_sys_read+0x49/0x60 fs/read_write.c:595
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 32454 Comm: ps Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/03/06 17:51 https://github.com/google/ktsan.git kcsan 941e0d917bbf 7fb694ef .config console log report ci2-upstream-kcsan-gce
2020/03/03 08:27 https://github.com/google/ktsan.git kcsan 766d004d1b85 350a7a26 .config console log report ci2-upstream-kcsan-gce
2020/02/09 10:51 https://github.com/google/ktsan.git kcsan f60f0f543333 6ece2ea5 .config console log report ci2-upstream-kcsan-gce
2020/02/06 23:59 https://github.com/google/ktsan.git kcsan 245a43005292 06150bf1 .config console log report ci2-upstream-kcsan-gce
2020/02/02 12:53 https://github.com/google/ktsan.git kcsan 245a43005292 93e5e335 .config console log report ci2-upstream-kcsan-gce
2020/01/22 18:14 https://github.com/google/ktsan.git kcsan 245a43005292 3334d684 .config console log report ci2-upstream-kcsan-gce
2020/01/03 21:53 https://github.com/google/ktsan.git kcsan 245a43005292 68256974 .config console log report ci2-upstream-kcsan-gce
2019/12/13 07:43 https://github.com/google/ktsan.git kcsan 245a43005292 2a752b7c .config console log report ci2-upstream-kcsan-gce
2019/12/12 05:46 https://github.com/google/ktsan.git kcsan ef798c30ba4e d973f528 .config console log report ci2-upstream-kcsan-gce
2019/11/30 03:57 https://github.com/google/ktsan.git kcsan ef798c30ba4e 3a75be00 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.