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Date:   Wed, 09 Dec 2020 03:48:10 -0800
From:   syzbot <syzbot+63bed493aebbf6872647@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, bp@...en8.de, davem@...emloft.net,
        hkallweit1@...il.com, hpa@...or.com, johan.hedberg@...il.com,
        kuba@...nel.org, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org, luto@...nel.org, marcel@...tmann.org,
        mingo@...hat.com, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: Re: WARNING in __queue_work (3)

syzbot has found a reproducer for the following issue on:

HEAD commit:    7d8761ba Merge branch 'fixes' of git://git.kernel.org/pub/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14859745500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=59df2a4dced5f928
dashboard link: https://syzkaller.appspot.com/bug?extid=63bed493aebbf6872647
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1431cc13500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+63bed493aebbf6872647@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 24939 at kernel/workqueue.c:1416 __queue_work+0xb59/0xf00 kernel/workqueue.c:1416
Modules linked in:
CPU: 1 PID: 24939 Comm: syz-executor.3 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__queue_work+0xb59/0xf00 kernel/workqueue.c:1416
Code: e0 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8 3f d0 69 00 8b 5b 24 31 ff 83 e3 20 89 de e8 20 4b 28 00 85 db 75 7c e8 c7 52 28 00 <0f> 0b e9 dc fa ff ff e8 bb 52 28 00 0f 0b e9 55 fa ff ff e8 af 52
RSP: 0018:ffffc9000266f750 EFLAGS: 00010093
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8147b1a0
RDX: ffff88801f184ec0 RSI: ffffffff8147b1a9 RDI: 0000000000000005
RBP: ffff88804d3d4b00 R08: 0000000000000000 R09: ffffffff8f12d1a3
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888059ce4ac8
R13: ffff88803f6b5800 R14: 0000000000000293 R15: ffff88803f6b5800
FS:  00007f4e91751700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007effff766db8 CR3: 0000000059bc0000 CR4: 0000000000350ee0
Call Trace:
 queue_work_on+0xc7/0xd0 kernel/workqueue.c:1521
 l2cap_do_send+0x248/0x480 net/bluetooth/l2cap_core.c:987
 l2cap_chan_send+0xcc3/0x2ac0 net/bluetooth/l2cap_core.c:2706
 l2cap_sock_sendmsg+0x235/0x2f0 net/bluetooth/l2cap_sock.c:1134
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:671
 ____sys_sendmsg+0x331/0x810 net/socket.c:2353
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407
 __sys_sendmmsg+0x195/0x470 net/socket.c:2497
 __do_sys_sendmmsg net/socket.c:2526 [inline]
 __se_sys_sendmmsg net/socket.c:2523 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2523
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e0f9
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4e91750c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e0f9
RDX: 0000000000000500 RSI: 0000000020003f00 RDI: 0000000000000005
RBP: 000000000119c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007ffd9c18ecaf R14: 00007f4e917519c0 R15: 000000000119c034

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