syzbot


WARNING in rcu_sync_dtor (2)

Status: upstream: reported C repro on 2024/11/16 09:33
Subsystems: exfat
[Documentation on labels]
Reported-by: syzbot+823cd0d24881f21ab9f1@syzkaller.appspotmail.com
First crash: 406d, last: 5h16m
Cause bisection: introduced by (bisect log) :
commit f761fcdd289d07e8547fef7ac76c3760fc7803f2
Author: Dongliang Cui <dongliang.cui@unisoc.com>
Date: Tue Sep 17 22:40:05 2024 +0000

  exfat: Implement sops->shutdown and ioctl

Crash: WARNING in rcu_sync_dtor (log)
Repro: C syz .config
  
Discussions (5)
Title Replies (including bot) Last reply
[syzbot] Monthly exfat report (Dec 2025) 0 (1) 2025/12/01 10:41
[syzbot] Monthly exfat report (Sep 2025) 0 (1) 2025/09/26 18:13
[syzbot] Monthly exfat report (Aug 2025) 0 (1) 2025/08/26 07:14
[syzbot] Monthly exfat report (Jul 2025) 0 (1) 2025/07/26 08:56
[syzbot] [fs?] WARNING in rcu_sync_dtor (2) 2 (5) 2024/11/17 00:46
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in rcu_sync_dtor origin:upstream -1 C done 157 433d 515d 3/3 fixed on 2024/11/26 10:25
upstream WARNING in rcu_sync_dtor f2fs -1 C done 749 451d 515d 28/29 fixed on 2024/10/22 11:57
linux-6.1 WARNING in rcu_sync_dtor -1 1 466d 466d 0/3 auto-obsoleted due to no activity on 2024/12/22 13:56
Last patch testing requests (5)
Created Duration User Patch Repo Result
2025/02/12 06:25 13m retest repro upstream report log
2024/11/26 20:36 1h03m retest repro upstream report log
2024/11/26 20:36 15m retest repro upstream report log
2024/11/17 00:26 13m hdanton@sina.com patch upstream report log
2024/11/16 23:09 15m hdanton@sina.com patch upstream report log
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/01/29 03:26 2h03m bisect fix upstream OK (0) job log log

Sample crash report:
------------[ cut here ]------------
WARNING: kernel/rcu/sync.c:177 at rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177, CPU#1: kworker/1:3/5904
Modules linked in:
CPU: 1 UID: 0 PID: 5904 Comm: kworker/1:3 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events destroy_super_work
RIP: 0010:rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177
Code: 18 e8 57 c3 00 00 43 0f b6 44 25 00 84 c0 0f 85 82 00 00 00 83 3b 00 75 1f 5b 41 5c 41 5d 41 5e 41 5f 5d e9 55 39 30 09 cc 90 <0f> 0b 90 e9 66 ff ff ff 90 0f 0b 90 eb 8a 90 0f 0b 90 eb db 89 d9
RSP: 0018:ffffc900042879e8 EFLAGS: 00010246
RAX: 0000000000000002 RBX: ffff888029d42330 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8b3f57c0 RDI: ffff888029d42330
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1a8a48d R12: dffffc0000000000
R13: 1ffff110053a8466 R14: ffff888029d42330 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888126def000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555be07808 CR3: 000000001ff3a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 percpu_free_rwsem+0x43/0x80 kernel/locking/percpu-rwsem.c:42
 destroy_super_work+0x217/0x310 fs/super.c:283
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

Crashes (734):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/22 23:34 upstream 9448598b22c5 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/19 16:46 upstream dd9b004b7ff3 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/17 20:10 upstream ea1013c15392 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/12 00:14 upstream d358e5254674 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/10 15:42 upstream c9b47175e913 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/01 18:35 upstream 7d0a66e4bb90 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/10/21 13:45 upstream 6548d364a3e8 9832ed61 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/10/18 10:03 upstream cf1ea8854e4f 1c8c8cd8 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/10/17 06:01 upstream 98ac9cc4b445 19568248 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/10/14 15:41 upstream 3a8660878839 b6605ba8 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/10/10 08:59 upstream 5472d60c129f ff1712fe .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/09/29 22:19 upstream e5f0a698b34e 86341da6 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/09/29 19:23 upstream e5f0a698b34e 86341da6 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/09/25 02:41 upstream 4ea5af085908 0abd0691 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/09/22 19:21 upstream 07e27ad16399 0ac7291c .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/09/13 11:30 upstream 22f20375f5b7 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/09/03 08:29 upstream e6b9dce0aeeb 96a211bc .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1 (corrupt fs)] [mounted in repro #2] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/08/27 11:09 upstream fab1beda7597 e12e5ba4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/07/30 06:08 upstream 0919a5b3b11c f8f2b4da .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/07/25 22:34 upstream 2942242dde89 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/07/20 11:02 upstream bf61759db409 7117feec .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/07/18 18:00 upstream 6832a9317eee 88248e14 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/07/14 16:38 upstream 347e9f5043c8 d8fc7335 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/07/09 10:38 upstream 733923397fd9 f4e5e155 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/07/01 11:06 upstream 66701750d556 6e83b42d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/06/26 02:00 upstream 92ca6c498a5e 26d77996 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/05/19 07:54 upstream a5806cd506af f41472b0 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/05/15 06:38 upstream c94d59a126cb d6b2ee52 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/05/11 16:44 upstream 3ce9925823c7 77908e5f .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/05/01 02:31 upstream 7a13c14ee59d ce7952f4 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/03/11 06:37 upstream 4d872d51bc9d 16256247 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/02/19 23:36 upstream 6537cfb395f3 b257a9b7 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2024/11/12 17:55 upstream 2d5404caa8c7 75bb1b32 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-upstream-fs WARNING in rcu_sync_dtor
2024/11/12 14:05 upstream 2d5404caa8c7 75bb1b32 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/11/08 07:06 upstream da32d155f4a8 4e1406b4 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root WARNING in rcu_sync_dtor
2025/10/21 08:09 linux-next 606da5bb1655 9832ed61 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in rcu_sync_dtor
2025/08/16 20:33 linux-next 931e46dcbc7e 1804e95e .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in rcu_sync_dtor
2025/07/09 05:40 linux-next 58ba80c47402 abade794 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in rcu_sync_dtor
2025/03/11 05:49 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 0a6021b3fc20 16256247 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-gce-arm64 WARNING in rcu_sync_dtor
2025/09/29 16:06 upstream e5f0a698b34e 86341da6 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro #1 (corrupt fs)] [mounted in repro #2] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/05/12 23:23 upstream 627277ba7c23 f6671af7 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/23 22:25 upstream b927546677c8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/23 20:17 upstream b927546677c8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/23 17:57 upstream b927546677c8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/23 10:36 upstream b927546677c8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/23 06:40 upstream b927546677c8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/23 03:33 upstream b927546677c8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/22 18:44 upstream 9448598b22c5 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/22 15:12 upstream 9448598b22c5 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/22 14:06 upstream 9448598b22c5 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/22 12:10 upstream 765b233a9b94 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/22 06:57 upstream 765b233a9b94 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/22 00:39 upstream 765b233a9b94 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/21 23:12 upstream 9094662f6707 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/21 20:28 upstream 9094662f6707 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/21 11:17 upstream 9094662f6707 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/21 09:02 upstream 9094662f6707 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/20 19:38 upstream d8ba32c5a460 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/20 15:39 upstream dd9b004b7ff3 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/20 12:54 upstream dd9b004b7ff3 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/20 10:53 upstream dd9b004b7ff3 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/20 09:47 upstream dd9b004b7ff3 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/19 15:16 upstream dd9b004b7ff3 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/19 10:15 upstream 516471569089 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/19 06:41 upstream 516471569089 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/18 08:18 upstream ea1013c15392 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/18 05:57 upstream ea1013c15392 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/17 20:07 upstream ea1013c15392 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/17 19:02 upstream ea1013c15392 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/17 13:25 upstream ea1013c15392 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/17 06:13 upstream ea1013c15392 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/17 04:27 upstream 40fbbd64bba6 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/16 17:59 upstream 40fbbd64bba6 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/15 05:40 upstream 8f0b4cce4481 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/14 20:17 upstream 8f0b4cce4481 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/14 08:12 upstream 8f0b4cce4481 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/14 06:13 upstream 9d9c1cfec01c d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/13 19:57 upstream 9d9c1cfec01c d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/13 18:56 upstream 9d9c1cfec01c d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/13 18:52 upstream 9d9c1cfec01c d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/13 05:20 upstream 9551a26f17d9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/13 04:06 upstream 187d0801404f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/13 01:02 upstream 187d0801404f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/12/12 08:24 upstream d358e5254674 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in rcu_sync_dtor
2025/10/15 22:05 upstream 1f4a222b0e33 19568248 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in rcu_sync_dtor
2025/10/10 08:08 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_sync_dtor
2025/12/03 07:07 linux-next b2c27842ba85 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in rcu_sync_dtor
2025/12/20 18:30 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f0b4cce4481 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in rcu_sync_dtor
2025/12/18 22:43 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f0b4cce4481 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in rcu_sync_dtor
* Struck through repros no longer work on HEAD.