Subject: [syzbot] WARNING: locking bug in nci_close_device

From: syzbot <[email-masked]>
Date: Fri, 03 Feb 2023 07:25:56 -0800

Hello,

syzbot found the following issue on:

HEAD commit:    6d796c50f84c Linux 6.2-rc6
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1575b409480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=94f93727847d4d81
dashboard link: https://syzkaller.appspot.com/bug?extid=4f51fcf4157a3fc6e591
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/195f64fbd733/disk-6d796c50.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9c7a9e02d9de/vmlinux-6d796c50.xz
kernel image: https://storage.googleapis.com/syzbot-assets/edf369edf5c2/bzImage-6d796c50.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 1 PID: 5158 at kernel/locking/lockdep.c:231 hlock_class kernel/locking/lockdep.c:231 [inline]
WARNING: CPU: 1 PID: 5158 at kernel/locking/lockdep.c:231 hlock_class kernel/locking/lockdep.c:220 [inline]
WARNING: CPU: 1 PID: 5158 at kernel/locking/lockdep.c:231 check_deadlock kernel/locking/lockdep.c:3016 [inline]
WARNING: CPU: 1 PID: 5158 at kernel/locking/lockdep.c:231 validate_chain kernel/locking/lockdep.c:3818 [inline]
WARNING: CPU: 1 PID: 5158 at kernel/locking/lockdep.c:231 __lock_acquire+0x2679/0x56d0 kernel/locking/lockdep.c:5055
Modules linked in:
CPU: 1 PID: 5158 Comm: kworker/1:5 Not tainted 6.2.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: events rfkill_sync_work
RIP: 0010:hlock_class kernel/locking/lockdep.c:231 [inline]
RIP: 0010:hlock_class kernel/locking/lockdep.c:220 [inline]
RIP: 0010:check_deadlock kernel/locking/lockdep.c:3016 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3818 [inline]
RIP: 0010:__lock_acquire+0x2679/0x56d0 kernel/locking/lockdep.c:5055
Code: c0 03 38 d0 7c 08 84 d2 0f 85 00 2b 00 00 83 3d c4 5e 0f 0d 00 75 c6 48 c7 c6 a0 51 4c 8a 48 c7 c7 00 4b 4c 8a e8 31 00 5c 08 <0f> 0b 31 c0 e9 6a fe ff ff e8 f9 b7 a4 02 89 c3 e8 82 5d ff ff 85
RSP: 0018:ffffc900047bf858 EFLAGS: 00010082
RAX: 0000000000000000 RBX: ffffffff91342f60 RCX: 0000000000000000
RDX: ffff888025f69d40 RSI: ffffffff816680ec RDI: fffff520008f7efd
RBP: ffff888025f6a778 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff888025f6a840
R13: 0000000000000dd1 R14: dffffc0000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555aaa848 CR3: 000000007ec38000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5668 [inline]
 lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
 __flush_workqueue+0x118/0x13a0 kernel/workqueue.c:2809
 nci_close_device+0xcb/0x370 net/nfc/nci/core.c:567
 nfc_dev_down+0x19a/0x2d0 net/nfc/core.c:161
 nfc_rfkill_set_block+0x33/0xd0 net/nfc/core.c:179
 rfkill_set_block+0x1f9/0x540 net/rfkill/core.c:345
 rfkill_sync_work+0x8e/0xc0 net/rfkill/core.c:1042
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x669/0x1090 kernel/workqueue.c:2436
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

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