linux-kernel - Re: [syzbot] [bluetooth?] WARNING in hci_recv

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Message-ID: <682b6a01.a00a0220.7a43a.0078.GAE@google.com>
Date: Mon, 19 May 2025 10:27:29 -0700
From: syzbot <syzbot+3e07a461b836821ff70e@...kaller.appspotmail.com>
To: hdanton@...a.com, johan.hedberg@...il.com, linux-bluetooth@...r.kernel.org, 
	linux-kernel@...r.kernel.org, luiz.dentz@...il.com, marcel@...tmann.org, 
	netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bluetooth?] WARNING in hci_recv_frame

syzbot has found a reproducer for the following issue on:

HEAD commit:    a5806cd506af Linux 6.15-rc7
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14bd52d4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6c2cd7998c108ba7
dashboard link: https://syzkaller.appspot.com/bug?extid=3e07a461b836821ff70e
compiler:       Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12bd52d4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=170ab1f4580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-a5806cd5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/114e439a107e/vmlinux-a5806cd5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/28859a387c14/bzImage-a5806cd5.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3e07a461b836821ff70e@...kaller.appspotmail.com

------------[ cut here ]------------
workqueue: cannot queue hci_rx_work on wq hci0
WARNING: CPU: 0 PID: 7345 at kernel/workqueue.c:2258 __queue_work+0xd62/0xfe0 kernel/workqueue.c:2256
Modules linked in:
CPU: 0 UID: 0 PID: 7345 Comm: syz-executor130 Not tainted 6.15.0-rc7-syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__queue_work+0xd62/0xfe0 kernel/workqueue.c:2256
Code: 42 80 3c 20 00 74 08 4c 89 ef e8 89 de 96 00 49 8b 75 00 49 81 c7 78 01 00 00 48 c7 c7 40 cc 69 8b 4c 89 fa e8 9f 40 f9 ff 90 <0f> 0b 90 90 e9 f1 f4 ff ff e8 00 e4 34 00 90 0f 0b 90 e9 dd fc ff
RSP: 0018:ffffc9000f4d7a88 EFLAGS: 00010046
RAX: 701780e79c022b00 RBX: 0000000000000000 RCX: ffff88803d9a0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 1ffff110022be938 R08: ffff88801fe23e93 R09: 1ffff11003fc47d2
R10: dffffc0000000000 R11: ffffed1003fc47d3 R12: dffffc0000000000
R13: ffff8880437f0a98 R14: ffff88803d9a0000 R15: ffff8880115f4978
FS:  00007f9904bca6c0(0000) GS:ffff88808d6c2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 000000004012c000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 queue_work_on+0x181/0x270 kernel/workqueue.c:2392
 queue_work include/linux/workqueue.h:662 [inline]
 hci_recv_frame+0x5ad/0x700 net/bluetooth/hci_core.c:2926
 vhci_get_user drivers/bluetooth/hci_vhci.c:512 [inline]
 vhci_write+0x358/0x4a0 drivers/bluetooth/hci_vhci.c:608
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x548/0xa90 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9905433a6f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 d9 6b 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 2c 6c 02 00 48
RSP: 002b:00007f9904bca1e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f99054bf3f8 RCX: 00007f9905433a6f
RDX: 0000000000000007 RSI: 0000200000000040 RDI: 00000000000000ca
RBP: 0000200000000040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f99054bf3f0
R13: 00007f99054bf3fc R14: 0000000000000040 R15: 00007ffdd9006d98
 </TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.