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Date: Sat, 13 Apr 2024 17:26:28 -0700
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Subject: [syzbot] [bluetooth?] WARNING in l2cap_chan_send
From: syzbot <syzbot+b6919040d9958e2fc1ae@syzkaller.appspotmail.com>
To: johan.hedberg@gmail.com, linux-bluetooth@vger.kernel.org, 
	linux-kernel@vger.kernel.org, luiz.dentz@gmail.com, marcel@holtmann.org, 
	netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com
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Hello,

syzbot found the following issue on:

HEAD commit:    f99c5f563c17 Merge tag 'nf-24-03-21' of git://git.kernel.o..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=14f69bd3180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6fb1be60a193d440
dashboard link: https://syzkaller.appspot.com/bug?extid=b6919040d9958e2fc1ae
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/65d3f3eb786e/disk-f99c5f56.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/799cf7f28ff8/vmlinux-f99c5f56.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ab26c60c3845/bzImage-f99c5f56.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b6919040d9958e2fc1ae@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 8027 at kernel/workqueue.c:2322 __queue_work+0xc6a/0xec0 kernel/workqueue.c:2321
Modules linked in:
CPU: 1 PID: 8027 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-05271-gf99c5f563c17 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:__queue_work+0xc6a/0xec0 kernel/workqueue.c:2321
Code: ff e8 3a e0 35 00 eb 21 e8 33 e0 35 00 eb 1a e8 2c e0 35 00 eb 13 e8 25 e0 35 00 90 0f 0b 90 e9 74 fd ff ff e8 17 e0 35 00 90 <0f> 0b 90 48 83 c4 68 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc
RSP: 0018:ffffc9000305f4c0 EFLAGS: 00010083
RAX: ffffffff815f103d RBX: ffff888022ff3c00 RCX: 0000000000040000
RDX: ffffc90012785000 RSI: 0000000000016230 RDI: 0000000000016231
RBP: 0000000000000000 R08: ffffffff815f0513 R09: 1ffff1100d0621be
R10: dffffc0000000000 R11: ffffed100d0621bf R12: dffffc0000000000
R13: ffff88802e5ad9c0 R14: ffff88802e5ad800 R15: 0000000000000008
FS:  00007f9fcf6a96c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001300 CR3: 0000000062a38000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 queue_work_on+0x14f/0x250 kernel/workqueue.c:2435
 l2cap_chan_send+0x3d6/0x2680
 l2cap_sock_sendmsg+0x1b4/0x2c0 net/bluetooth/l2cap_sock.c:1139
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmmsg+0x3b2/0x740 net/socket.c:2724
 __do_sys_sendmmsg net/socket.c:2753 [inline]
 __se_sys_sendmmsg net/socket.c:2750 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2750
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f9fce87de69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9fcf6a90c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f9fce9abf80 RCX: 00007f9fce87de69
RDX: 00000000ffffff80 RSI: 0000000020004100 RDI: 0000000000000006
RBP: 00007f9fce8ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010040 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9fce9abf80 R15: 00007ffd6dcb5768
 </TASK>


---
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