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KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread (2)

Status: auto-closed as invalid on 2021/05/17 11:36
Subsystems: nilfs
[Documentation on labels]
First crash: 1223d, last: 1100d
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread nilfs 1 1266d 1266d 0/26 auto-closed as invalid on 2020/12/01 14:00

Sample crash report:
==================================================================
BUG: KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread

write to 0xffff88802bb5b7e8 of 8 bytes by task 16426 on cpu 0:
 nilfs_segctor_thread+0x6b1/0x710 fs/nilfs2/segment.c:2606
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88802bb5b7e8 of 8 bytes by task 8414 on cpu 1:
 nilfs_segctor_kill_thread fs/nilfs2/segment.c:2636 [inline]
 nilfs_segctor_destroy fs/nilfs2/segment.c:2718 [inline]
 nilfs_detach_log_writer+0x169/0x5a0 fs/nilfs2/segment.c:2807
 nilfs_put_super+0x2f/0xf0 fs/nilfs2/super.c:467
 generic_shutdown_super+0xde/0x210 fs/super.c:464
 kill_block_super+0x4a/0x90 fs/super.c:1394
 deactivate_locked_super+0x6a/0xb0 fs/super.c:335
 deactivate_super+0x85/0x90 fs/super.c:366
 cleanup_mnt+0x277/0x2e0 fs/namespace.c:1136
 __cleanup_mnt+0x15/0x20 fs/namespace.c:1143
 task_work_run+0x8e/0x110 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x17c/0x1b0 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8414 Comm: syz-executor.3 Not tainted 5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (21):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/04/11 22:20 upstream 7d900724913c 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/04/11 06:02 upstream 52e44129fba5 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/04/10 11:58 upstream 4e04e7513b0f 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/04/06 22:21 upstream 2d743660786e 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/03/26 13:24 upstream db24726bfefa a8529b82 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/03/18 11:18 upstream 6417f03132a6 7216542e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/03/17 14:46 upstream 1df27313f50a fdb2bb2c .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/03/15 07:36 upstream 75013c6c52d8 cc1cff8f .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/03/14 00:12 upstream 88fe49249c99 4a003785 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/03/11 19:48 upstream 28806e4d9b97 c2ca1f2a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/02/18 01:38 upstream f40ddce88593 14052202 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/02/15 04:00 upstream f40ddce88593 98682e5e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/02/14 14:51 upstream 358feceebbf6 98682e5e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/02/05 07:05 upstream 5c279c4cf206 23a562df .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/02/02 23:58 upstream 3aaf0a27ffc2 624dad51 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/02/01 16:18 upstream 1048ba83fb1c e6b95f32 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/01/21 23:18 upstream 9791581c049c d4f4eca5 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in nilfs_detach_log_writer / nilfs_segctor_thread
2021/01/03 05:46 upstream 3516bd729358 79264ae3 .config console log report info ci2-upstream-kcsan-gce
2020/12/31 00:19 upstream f6e1ea196492 ecb8c012 .config console log report info ci2-upstream-kcsan-gce
2020/12/22 11:53 upstream 8653b778e454 04201c06 .config console log report info ci2-upstream-kcsan-gce
2020/12/09 18:25 upstream a68a0262abda 99917735 .config console log report info ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.