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KCSAN: data-race in pipe_lock / pipe_release

Status: auto-closed as invalid on 2020/08/09 18:16
Subsystems: fs
[Documentation on labels]
First crash: 1436d, last: 1419d
Similar bugs (12)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in pipe_lock / pipe_release (5) fs 1 892d 892d 0/26 auto-closed as invalid on 2022/01/18 04:35
upstream KCSAN: data-race in pipe_lock / pipe_release (8) fs 1 640d 640d 0/26 auto-closed as invalid on 2022/09/27 07:59
upstream KCSAN: data-race in pipe_lock / pipe_release (13) fs 1 95d 95d 0/26 auto-obsoleted due to no activity on 2024/03/25 04:35
upstream KCSAN: data-race in pipe_lock / pipe_release (4) fs 1 1153d 1153d 0/26 auto-closed as invalid on 2021/05/02 03:19
upstream KCSAN: data-race in pipe_lock / pipe_release (11) fs 1 241d 241d 0/26 auto-obsoleted due to no activity on 2023/10/31 07:05
upstream KCSAN: data-race in pipe_lock / pipe_release (6) fs 2 819d 821d 0/26 auto-closed as invalid on 2022/04/01 19:16
upstream KCSAN: data-race in pipe_lock / pipe_release (9) fs 6 385d 515d 0/26 auto-obsoleted due to no activity on 2023/06/09 03:35
upstream KCSAN: data-race in pipe_lock / pipe_release (3) fs 1 1311d 1311d 0/26 auto-closed as invalid on 2020/11/25 12:55
upstream KCSAN: data-race in pipe_lock / pipe_release (12) fs 1 149d 149d 0/26 auto-obsoleted due to no activity on 2024/01/31 07:04
upstream KCSAN: data-race in pipe_lock / pipe_release (7) fs 2 751d 779d 0/26 auto-closed as invalid on 2022/06/08 19:34
upstream KCSAN: data-race in pipe_lock / pipe_release (10) fs 2 322d 343d 0/26 auto-obsoleted due to no activity on 2023/08/10 23:17
upstream KCSAN: data-race in pipe_lock / pipe_release (2) fs 1 1361d 1361d 0/26 auto-closed as invalid on 2020/10/06 00:08

Sample crash report:
==================================================================
BUG: KCSAN: data-race in pipe_lock / pipe_release

write to 0xffff8880b6b467ec of 4 bytes by task 16474 on cpu 0:
 put_pipe_info fs/pipe.c:707 [inline]
 pipe_release+0x186/0x1e0 fs/pipe.c:737
 __fput+0x1df/0x460 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:135
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:216 [inline]
 __prepare_exit_to_usermode+0x1c6/0x230 arch/x86/entry/common.c:246
 __syscall_return_slowpath+0x47/0x60 arch/x86/entry/common.c:329
 do_syscall_64+0x5d/0xb0 arch/x86/entry/common.c:368
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b6b467ec of 4 bytes by task 16484 on cpu 1:
 pipe_lock_nested fs/pipe.c:65 [inline]
 pipe_lock+0x13/0x40 fs/pipe.c:74
 do_splice+0xc95/0x10c0 fs/splice.c:1170
 __do_sys_splice fs/splice.c:1419 [inline]
 __se_sys_splice fs/splice.c:1401 [inline]
 __x64_sys_splice+0xf2/0x190 fs/splice.c:1401
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16484 Comm: syz-executor.3 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/07/05 18:16 upstream 45a5ac7a5cc3 22f87567 .config console log report ci2-upstream-kcsan-gce
2020/06/18 16:31 upstream 1b5044021070 3ea11d3f .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.