syzbot


WARNING: locking bug in find_lock_lowest_rq

Status: upstream: reported C repro on 2024/04/25 01:07
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+9a3a26ce3bf119f0190b@syzkaller.appspotmail.com
First crash: 341d, last: 10d
Cause bisection: failed (error log, bisect log)
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ext4?] WARNING: locking bug in find_lock_lowest_rq 2 (3) 2024/05/29 15:50
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: unable to handle kernel paging request in find_lock_lowest_rq kernel 21 57d 239d 0/28 upstream: reported on 2024/07/31 23:30
Last patch testing requests (6)
Created Duration User Patch Repo Result
2025/03/02 00:09 24m retest repro upstream OK log
2025/03/02 00:09 26m retest repro upstream report log
2025/03/02 00:09 29m retest repro upstream OK log
2025/03/02 00:09 24m retest repro upstream OK log
2024/09/07 00:05 23m retest repro upstream report log
2024/05/18 13:23 23m retest repro upstream report log

Sample crash report:
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 0 PID: 11 at kernel/locking/lockdep.c:232 hlock_class kernel/locking/lockdep.c:232 [inline]
WARNING: CPU: 0 PID: 11 at kernel/locking/lockdep.c:232 check_wait_context kernel/locking/lockdep.c:4773 [inline]
WARNING: CPU: 0 PID: 11 at kernel/locking/lockdep.c:232 __lock_acquire+0x573/0x1fd0 kernel/locking/lockdep.c:5087
Modules linked in:
CPU: 0 PID: 11 Comm: kworker/u8:1 Not tainted 6.9.0-rc4-syzkaller-00266-g977b1ef51866 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
RIP: 0010:hlock_class kernel/locking/lockdep.c:232 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4773 [inline]
RIP: 0010:__lock_acquire+0x573/0x1fd0 kernel/locking/lockdep.c:5087
Code: 00 00 83 3d ee 8f 36 0e 00 75 23 90 48 c7 c7 40 b7 ca 8b 48 c7 c6 e0 b9 ca 8b e8 f8 f6 e5 ff 48 ba 00 00 00 00 00 fc ff df 90 <0f> 0b 90 90 90 31 db 48 81 c3 c4 00 00 00 48 89 d8 48 c1 e8 03 0f
RSP: 0018:ffffc900001070d0 EFLAGS: 00010046
RAX: 006b76d8e1927600 RBX: 0000000000001b80 RCX: ffff8880172abc00
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000000001e R08: ffffffff81588072 R09: 1ffff1101728519a
R10: dffffc0000000000 R11: ffffed101728519b R12: 0000000000000001
R13: ffff8880172abc00 R14: 000000000000001e R15: ffff8880172ac7e8
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdb8988bb8 CR3: 000000002e4fc000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
 _double_lock_balance kernel/sched/sched.h:2714 [inline]
 double_lock_balance kernel/sched/sched.h:2759 [inline]
 find_lock_lowest_rq+0x1e1/0x670 kernel/sched/rt.c:1942
 push_rt_task+0x13f/0x7f0 kernel/sched/rt.c:2075
 push_rt_tasks kernel/sched/rt.c:2125 [inline]
 task_woken_rt+0x14c/0x220 kernel/sched/rt.c:2425
 ttwu_do_activate+0x338/0x7e0 kernel/sched/core.c:3805
 ttwu_queue kernel/sched/core.c:4057 [inline]
 try_to_wake_up+0x88b/0x1470 kernel/sched/core.c:4378
 autoremove_wake_function+0x16/0x110 kernel/sched/wait.c:384
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock+0x132/0x1e0 kernel/sched/wait.c:106
 sub_reserved_credits fs/jbd2/transaction.c:213 [inline]
 start_this_handle+0x1db0/0x22a0 fs/jbd2/transaction.c:442
 jbd2_journal_start_reserved+0xe8/0x300 fs/jbd2/transaction.c:624
 __ext4_journal_start_reserved+0x237/0x460 fs/ext4/ext4_jbd2.c:161
 ext4_convert_unwritten_io_end_vec+0x34/0x170 fs/ext4/extents.c:4877
 ext4_end_io_end fs/ext4/page-io.c:186 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:259 [inline]
 ext4_end_io_rsv_work+0x36c/0x6f0 fs/ext4/page-io.c:273
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa12/0x17c0 kernel/workqueue.c:3335
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
 kthread+0x2f2/0x390 kernel/kthread.c:388
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Crashes (100):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/21 03:01 upstream 977b1ef51866 af24b050 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/03/17 16:45 upstream 4701f33a1070 948c34e4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/03/15 21:55 upstream 3571e8b091f4 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/03/15 16:34 upstream a29967be967e e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/03/11 08:16 upstream 4d872d51bc9d 16256247 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/02/15 22:15 upstream 7ff71e6d9239 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/02/11 04:23 upstream febbc555cf0f 43f51a00 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/02/10 20:25 upstream a64dcfb451e2 43f51a00 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/02/09 18:37 upstream 9946eaf552b1 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/02/08 17:57 upstream 8f6629c004b1 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/02/02 06:18 upstream 69e858e0b8b2 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/27 13:48 upstream 9c5968db9e62 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/21 08:40 upstream 3d3a9c8b89d4 6e87cfa2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/20 22:23 upstream ffd294d346d1 6e87cfa2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/17 16:30 upstream 9bffa1ad25b8 953d1c45 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/16 12:18 upstream 619f0b6fad52 968edaf4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/13 14:38 upstream 5bc55a333a2f 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/11 23:31 upstream 77a903cd8e5a 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/10 15:05 upstream 2144da25584e 67d7ec0a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/08 23:36 upstream 0b7958fa05d5 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/08 17:21 upstream 09a0fa92e5b4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/08 08:55 upstream 09a0fa92e5b4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/07 18:35 upstream fbfd64d25c7a f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/02 22:21 upstream 0bc21e701a6f d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/02 01:22 upstream 56e6a3499e14 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2025/01/01 06:54 upstream ccb98ccef0e5 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/28 01:51 upstream 8379578b11d5 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/27 18:59 upstream d6ef8b40d075 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/26 00:40 upstream 9b2ffa6148b1 444551c4 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/24 17:21 upstream f07044dd0df0 444551c4 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/21 17:46 upstream 499551201b5f d7f584ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/21 14:04 upstream 499551201b5f d7f584ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/21 08:36 upstream 499551201b5f d7f584ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/14 16:03 upstream a446e965a188 7cbfbb3a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/12 04:59 upstream 231825b2e1ff ff949d25 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/11 15:24 upstream f92f4749861b ff949d25 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/10 11:47 upstream 7cb1b4663150 cfc402b4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/09 07:54 upstream 62b5a46999c7 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/12/05 03:26 upstream feffde684ac2 29f61fce .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/29 10:59 upstream 7af08b57bcb9 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/29 07:23 upstream 7af08b57bcb9 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/28 07:15 upstream aaf20f870da0 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/26 17:11 upstream 2c22dc1ee3a1 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/26 12:18 upstream 2c22dc1ee3a1 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/26 10:21 upstream 2c22dc1ee3a1 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/25 18:36 upstream 9f16d5e6f220 a84878fc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/24 13:14 upstream 9f16d5e6f220 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/22 00:48 upstream fcc79e1714e8 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/19 21:46 upstream 158f238aa69d 571351cb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/19 13:25 upstream c6d64479d609 571351cb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/18 01:46 upstream f66d6acccbc0 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/17 13:05 upstream 4a5df3796467 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/17 12:03 upstream 4a5df3796467 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/17 02:10 upstream e8bdb3c8be08 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/11/08 18:03 upstream 906bd684e4b1 179b040e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/05/31 00:25 upstream 4a4be1ad3a6e 34889ee3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/05/22 19:16 upstream 8f6a15f095a6 4d098039 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/05/04 12:32 upstream 3d25a941ea50 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
2024/04/21 01:02 upstream 977b1ef51866 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: locking bug in find_lock_lowest_rq
* Struck through repros no longer work on HEAD.