Re: [syzbot] [bluetooth?] WARNING in l2cap_do_send (2)

[syzbot <syzbot+d6cd076b385aefcb6b16@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in hci_send_acl

------------[ cut here ]------------
WARNING: CPU: 3 PID: 7942 at kernel/workqueue.c:1722 __queue_work+0xdc6/0x11d0 kernel/workqueue.c:1721
Modules linked in:
CPU: 3 PID: 7942 Comm: syz-executor.2 Not tainted 6.7.0-rc7-syzkaller-gfbafc3e621c3-dirty #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__queue_work+0xdc6/0x11d0 kernel/workqueue.c:1721
Code: 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8 a3 92 87 00 8b 5b 2c 31 ff 83 e3 20 89 de e8 e4 a6 31 00 85 db 75 56 e8 6b ab 31 00 90 <0f> 0b 90 e9 ac f8 ff ff e8 5d ab 31 00 90 0f 0b 90 e9 5b f8 ff ff
RSP: 0018:ffffc900035c76b8 EFLAGS: 00010093
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8154b90c
RDX: ffff88803b7dce40 RSI: ffffffff8154b915 RDI: 0000000000000005
RBP: 0000000000000200 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888041fc4df0
R13: 0000000000000000 R14: ffff88802e93c000 R15: ffff88802e93c000
FS:  00007f0253c846c0(0000) GS:ffff88806b900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001038 CR3: 000000002a347000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 queue_work_on+0xed/0x110 kernel/workqueue.c:1831
 queue_work include/linux/workqueue.h:562 [inline]
 hci_send_acl+0xa0a/0xd10 net/bluetooth/hci_core.c:3245
 l2cap_do_send+0x318/0x470 net/bluetooth/l2cap_core.c:1015
 l2cap_chan_send+0xb7d/0x2ae0 net/bluetooth/l2cap_core.c:2726
 l2cap_sock_sendmsg+0x218/0x2e0 net/bluetooth/l2cap_sock.c:1154
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 ____sys_sendmsg+0x2ac/0x940 net/socket.c:2584
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638
 __sys_sendmmsg+0x1a1/0x450 net/socket.c:2724
 __do_sys_sendmmsg net/socket.c:2753 [inline]
 __se_sys_sendmmsg net/socket.c:2750 [inline]
 __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2750
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f0252e7cce9
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:00007f0253c840c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f0252f9bf80 RCX: 00007f0252e7cce9
RDX: 0000000000000735 RSI: 0000000020000b80 RDI: 0000000000000004
RBP: 00007f0252ec947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000024044840 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f0252f9bf80 R15: 00007ffdfd80dbc8
 </TASK>


Tested on:

commit:         fbafc3e6 Merge tag 'for_linus' of git://git.kernel.org..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=14c1f31ae80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e1e118a9228c45d7
dashboard link: https://syzkaller.appspot.com/bug?extid=d6cd076b385aefcb6b16
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17377bbee80000