syzbot


WARNING in l2cap_chan_send

Status: upstream: reported on 2024/04/14 00:26
Subsystems: bluetooth
[Documentation on labels]
Reported-by: syzbot+b6919040d9958e2fc1ae@syzkaller.appspotmail.com
First crash: 547d, last: 9d10h
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bluetooth?] WARNING in l2cap_chan_send 0 (1) 2024/04/14 00:26
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in l2cap_chan_send -1 1 194d 194d 0/3 auto-obsoleted due to no activity on 2025/07/06 18:42

Sample crash report:
------------[ cut here ]------------
workqueue: cannot queue hci_tx_work on wq hci0
WARNING: CPU: 0 PID: 18997 at kernel/workqueue.c:2255 __queue_work+0xd03/0x1160 kernel/workqueue.c:2254
Modules linked in:
CPU: 0 UID: 0 PID: 18997 Comm: syz.1.3296 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__queue_work+0xd03/0x1160 kernel/workqueue.c:2254
Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 4b 04 00 00 48 8b 75 18 4c 89 fa 48 c7 c7 a0 03 ac 8b e8 be 1e f7 ff 90 <0f> 0b 90 90 e9 2f f7 ff ff e8 8f 7b 38 00 90 0f 0b 90 e9 b4 f5 ff
RSP: 0018:ffffc90004a97710 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90020733000
RDX: 0000000000080000 RSI: ffffffff817a4395 RDI: 0000000000000001
RBP: ffff88805dd4cb50 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: fffffffffffce858 R12: 0000000000000008
R13: ffff88807f0db000 R14: 0000000000000000 R15: ffff88807f0db178
FS:  00007f7326cdc6c0(0000) GS:ffff8881246b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003940 CR3: 0000000050120000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 queue_work_on+0x1a4/0x1f0 kernel/workqueue.c:2390
 l2cap_chan_send+0xce5/0x2c50 net/bluetooth/l2cap_core.c:2610
 l2cap_sock_sendmsg+0x3c7/0x490 net/bluetooth/l2cap_sock.c:1139
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg net/socket.c:729 [inline]
 ____sys_sendmsg+0xa95/0xc70 net/socket.c:2614
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2668
 __sys_sendmmsg+0x200/0x420 net/socket.c:2757
 __do_sys_sendmmsg net/socket.c:2784 [inline]
 __se_sys_sendmmsg net/socket.c:2781 [inline]
 __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2781
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7325d8eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7326cdc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f7325fd6090 RCX: 00007f7325d8eba9
RDX: 000000000000ff80 RSI: 0000200000003940 RDI: 0000000000000006
RBP: 00007f7325e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000024004810 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7325fd6128 R14: 00007f7325fd6090 R15: 00007ffc32846ad8
 </TASK>

Crashes (48):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/14 07:31 upstream 5cd64d4f9268 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in l2cap_chan_send
2025/02/16 13:59 upstream 496659003dac 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2cap_chan_send
2024/11/20 17:47 upstream bf9aa14fc523 4fca1650 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in l2cap_chan_send
2024/10/02 19:52 upstream e32cde8d2bd7 a4c7fd36 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in l2cap_chan_send
2024/07/04 18:23 upstream 795c58e4c7fc dc6bbff0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2cap_chan_send
2024/05/13 07:29 upstream ba16c1cf11c9 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2cap_chan_send
2025/01/15 08:23 upstream c3812b15000c 7315a7cf .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in l2cap_chan_send
2024/08/02 10:38 upstream c0ecd6388360 1e9c4cf3 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in l2cap_chan_send
2024/08/02 08:00 upstream c0ecd6388360 1e9c4cf3 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in l2cap_chan_send
2024/08/02 07:50 upstream c0ecd6388360 1e9c4cf3 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in l2cap_chan_send
2024/07/08 08:00 upstream 256abd8e550c 7ca8bbea .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in l2cap_chan_send
2025/06/22 12:32 upstream 739a6c93cc75 d6cdfb8a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in l2cap_chan_send
2025/02/09 15:35 upstream 9946eaf552b1 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in l2cap_chan_send
2024/10/03 02:30 upstream f23aa4c0761a a4c7fd36 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in l2cap_chan_send
2024/09/10 05:43 upstream bc83b4d1f086 784df80e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in l2cap_chan_send
2024/09/04 14:39 upstream 88fac17500f4 9d47f20a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in l2cap_chan_send
2024/08/13 15:32 upstream d74da846046a 24d82c00 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in l2cap_chan_send
2024/07/18 04:03 upstream b1bc554e009e 0f902625 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in l2cap_chan_send
2025/09/29 16:56 net 012ea489aeda 86341da6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2025/09/13 09:57 net 201825fb4278 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2025/08/21 07:19 net f7b0b97c2d38 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/09/28 10:09 net d505d3593b52 440b26ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/09/28 04:18 net d505d3593b52 440b26ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/09/23 22:51 net c8770db2d544 89298aad .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/09/13 03:18 net 3e705251d998 73e8a465 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/07/20 01:24 net d7e78951a8b8 b88348e9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/07/01 08:32 net 134061163ee5 757f06b1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/06/07 06:07 net d30d0e49da71 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/06/06 01:42 net f8f0de9d58d9 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/05/31 19:35 net 13c7c941e729 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/05/15 01:59 net aea27a92a41d fdb4c10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/05/09 05:57 net 02754103e1f7 20bf80e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2024/04/10 00:20 net f99c5f563c17 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2cap_chan_send
2025/04/21 03:39 net-next 8066e388be48 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2025/03/21 21:55 net-next d9917c7d533c 62330552 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/10/26 18:02 net-next 6d858708d465 65e8686b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/09/20 03:49 net-next 9410645520e9 6f888b75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/07/19 09:39 net-next 51835949dda3 ee4e11c8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/07/16 22:14 net-next 77ae5e5b0072 215bec2d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/07/16 22:04 net-next 77ae5e5b0072 215bec2d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/07/13 16:14 net-next 69cf87304dcb eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/06/29 00:02 net-next 748e3bbf4721 757f06b1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/06/22 17:25 net-next 185d72112b95 edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/05/19 22:15 net-next 4b377b4868ef c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/05/19 16:02 net-next 4b377b4868ef c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/05/15 02:50 net-next 654de42f3fc6 fdb4c10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/05/06 07:19 net-next cdc74c9d06e7 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2cap_chan_send
2024/06/17 00:14 linux-next a957267fa7e9 f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in l2cap_chan_send
* Struck through repros no longer work on HEAD.