syzbot


possible deadlock in __flush_workqueue

Status: auto-obsoleted due to no activity on 2024/10/16 01:58
Reported-by: syzbot+3c62604ff542518d26c2@syzkaller.appspotmail.com
First crash: 263d, last: 118d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in __flush_workqueue (2) usb C error 43 87d 114d 0/28 closed as dup on 2024/08/13 06:06
upstream possible deadlock in __flush_workqueue bluetooth 1456 121d 320d 26/28 fixed on 2024/08/06 11:02

Sample crash report:
============================================
WARNING: possible recursive locking detected
6.1.103-syzkaller #0 Not tainted
--------------------------------------------
kworker/0:1H/52 is trying to acquire lock:
ffff888059278d38 ((wq_completion)xillyusb){+.+.}-{0:0}, at: __flush_workqueue+0x157/0x1610 kernel/workqueue.c:2812

but task is already holding lock:
ffff888059278d38 ((wq_completion)xillyusb){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock((wq_completion)xillyusb);
  lock((wq_completion)xillyusb);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

2 locks held by kworker/0:1H/52:
 #0: ffff888059278d38 ((wq_completion)xillyusb){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #1: ffffc90000bd7d20 ((work_completion)(&xdev->wakeup_workitem)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267

stack backtrace:
CPU: 0 PID: 52 Comm: kworker/0:1H Not tainted 6.1.103-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: xillyusb wakeup_all
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_deadlock_bug kernel/locking/lockdep.c:2983 [inline]
 check_deadlock kernel/locking/lockdep.c:3026 [inline]
 validate_chain+0x4711/0x5950 kernel/locking/lockdep.c:3812
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __flush_workqueue+0x170/0x1610 kernel/workqueue.c:2812
 drain_workqueue+0xc5/0x390 kernel/workqueue.c:2977
 destroy_workqueue+0x7b/0xae0 kernel/workqueue.c:4423
 cleanup_dev drivers/char/xillybus/xillyusb.c:550 [inline]
 kref_put+0x100/0x180 include/linux/kref.h:65
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (140):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/08/07 01:58 linux-6.1.y 48d525b0e463 1ef9fe42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/24 13:31 linux-6.1.y 9b3f9a5b12dc 57b2edb1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/24 06:56 linux-6.1.y 9b3f9a5b12dc 57b2edb1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/23 18:34 linux-6.1.y 9b3f9a5b12dc e50e8da5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/23 12:45 linux-6.1.y 9b3f9a5b12dc e50e8da5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/23 04:40 linux-6.1.y 9b3f9a5b12dc 708c10c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/22 16:31 linux-6.1.y 9b3f9a5b12dc df655b64 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/20 20:25 linux-6.1.y 9b3f9a5b12dc b88348e9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/20 16:33 linux-6.1.y 9b3f9a5b12dc b88348e9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/20 08:44 linux-6.1.y 9b3f9a5b12dc b88348e9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/19 22:57 linux-6.1.y 9b3f9a5b12dc 890ce4f3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/19 08:12 linux-6.1.y 9b3f9a5b12dc ee4e11c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/18 13:30 linux-6.1.y 9b3f9a5b12dc 71884c12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/17 08:19 linux-6.1.y cac15753b8ce 215bec2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/16 16:50 linux-6.1.y cac15753b8ce b66b37bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/16 07:42 linux-6.1.y cac15753b8ce e8709b21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/16 06:18 linux-6.1.y cac15753b8ce e8709b21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/15 20:24 linux-6.1.y cac15753b8ce e8709b21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/15 14:52 linux-6.1.y cac15753b8ce c605e6a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/11 20:36 linux-6.1.y 266ee8e06d5b eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/10 18:15 linux-6.1.y 7753af06eebf 6f7fa383 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/09 16:50 linux-6.1.y 7753af06eebf 79d68ada .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/09 13:54 linux-6.1.y 7753af06eebf 79d68ada .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/09 12:23 linux-6.1.y 7753af06eebf bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/09 05:52 linux-6.1.y 7753af06eebf bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/08 17:13 linux-6.1.y 7753af06eebf cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/08 13:53 linux-6.1.y 7753af06eebf cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/08 07:15 linux-6.1.y 7753af06eebf 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/08 07:00 linux-6.1.y 7753af06eebf 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/07 07:45 linux-6.1.y 7753af06eebf 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/06 20:54 linux-6.1.y 7753af06eebf 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/06 19:20 linux-6.1.y 7753af06eebf 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/04 02:35 linux-6.1.y 99e6a620de00 f76a75f3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/03 06:59 linux-6.1.y 99e6a620de00 1ecfa2d8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/01 18:09 linux-6.1.y 99e6a620de00 b294e901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/29 07:08 linux-6.1.y 99e6a620de00 757f06b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/29 05:25 linux-6.1.y 99e6a620de00 757f06b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/28 13:14 linux-6.1.y 99e6a620de00 6ef39602 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/27 06:25 linux-6.1.y eb44d83053d6 c6d33a01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/26 17:11 linux-6.1.y eb44d83053d6 c6d33a01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/18 15:28 linux-6.1.y eb44d83053d6 639d6cdf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/18 07:27 linux-6.1.y eb44d83053d6 ce6011bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/16 20:56 linux-6.1.y eb44d83053d6 f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/16 16:56 linux-6.1.y eb44d83053d6 f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/16 14:20 linux-6.1.y eb44d83053d6 f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/15 03:30 linux-6.1.y ae9f2a70d69e f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/15 02:15 linux-6.1.y ae9f2a70d69e f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/14 16:53 linux-6.1.y ae9f2a70d69e 8d849073 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/13 20:10 linux-6.1.y ae9f2a70d69e a9616ff5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/06/12 14:10 linux-6.1.y ae9f2a70d69e f815599d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/05/17 11:26 linux-6.1.y 4078fa637fcd c2e07261 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf possible deadlock in __flush_workqueue
2024/03/14 23:13 linux-6.1.y 61adba85cc40 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan possible deadlock in __flush_workqueue
2024/07/25 00:40 linux-6.1.y 9b3f9a5b12dc d1a1b0ca .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 possible deadlock in __flush_workqueue
2024/07/15 18:33 linux-6.1.y cac15753b8ce c605e6a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 possible deadlock in __flush_workqueue
2024/07/15 10:20 linux-6.1.y cac15753b8ce c605e6a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 possible deadlock in __flush_workqueue
2024/07/08 15:02 linux-6.1.y 7753af06eebf cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 possible deadlock in __flush_workqueue
2024/06/22 09:12 linux-6.1.y eb44d83053d6 edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 possible deadlock in __flush_workqueue
2024/06/15 19:52 linux-6.1.y ae9f2a70d69e f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 possible deadlock in __flush_workqueue
* Struck through repros no longer work on HEAD.