* [syzbot] [bluetooth?] WARNING in hci_recv_frame (2)
@ 2026-10-07 4:59 syzbot
2026-10-18 7:19 ` syzbot
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2026-10-07 4:59 UTC (permalink / raw)
To: linux-bluetooth, linux-kernel, luiz.dentz, marcel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 5e0f8396d480 Merge tag 'hid-for-linus-2026100201' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16583b15580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2b924f079099ba6e
dashboard link: https://syzkaller.appspot.com/bug?extid=2344fb8002f3ef5b1712
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-5e0f8396.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cc2553b94d4a/vmlinux-5e0f8396.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a71fb7875957/bzImage-5e0f8396.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2344fb8002f3ef5b1712@syzkaller.appspotmail.com
------------[ cut here ]------------
workqueue: cannot queue hci_rx_work on wq hci0
WARNING: kernel/workqueue.c:2353 at __queue_work+0xd83/0x10d0 kernel/workqueue.c:2352, CPU#0: syz.0.0/5329
Modules linked in:
CPU: 0 UID: 0 PID: 5329 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__queue_work+0xd9f/0x10d0 kernel/workqueue.c:2352
Code: 49 81 c7 70 01 00 00 4c 8d 35 ad f3 ee 0e 48 89 f8 48 c1 e8 03 80 3c 18 00 74 05 e8 3b 5a ab 00 49 8b 75 18 4c 89 f7 4c 89 fa <67> 48 0f b9 3a 4c 89 e8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ef e8
RSP: 0018:ffffc9000dddfaf8 EFLAGS: 00010046
RAX: 1ffff11002519978 RBX: dffffc0000000000 RCX: ffff8880003a8000
RDX: ffff88804395a970 RSI: ffffffff8ad8e820 RDI: ffffffff907d5aa0
RBP: 0000000000000000 R08: ffff8880128ccbaf R09: 1ffff11002519975
R10: dffffc0000000000 R11: ffffed1002519976 R12: 0000000000000008
R13: ffff8880128ccba8 R14: ffffffff907d5aa0 R15: ffff88804395a970
FS: 00007f33daf926c0(0000) GS:ffff88808c2bc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f33d2a07c00 CR3: 00000000439fd000 CR4: 0000000000352ef0
Call Trace:
<TASK>
queue_work_on+0x106/0x1d0 kernel/workqueue.c:2501
queue_work include/linux/workqueue.h:700 [inline]
hci_recv_frame+0x61e/0x7c0 net/bluetooth/hci_core.c:2946
vhci_get_user drivers/bluetooth/hci_vhci.c:530 [inline]
vhci_write+0x35d/0x4a0 drivers/bluetooth/hci_vhci.c:626
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f33deb5e98e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f33daf91f78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f33daf926c0 RCX: 00007f33deb5e98e
RDX: 0000000000000007 RSI: 0000200000000400 RDI: 00000000000000ca
RBP: 00007f33dec3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f33dee26308 R14: 00007f33dee26270 R15: 00007ffd8d2ee0e8
</TASK>
----------------
Code disassembly (best guess):
0: 49 81 c7 70 01 00 00 add $0x170,%r15
7: 4c 8d 35 ad f3 ee 0e lea 0xeeef3ad(%rip),%r14 # 0xeeef3bb
e: 48 89 f8 mov %rdi,%rax
11: 48 c1 e8 03 shr $0x3,%rax
15: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1)
19: 74 05 je 0x20
1b: e8 3b 5a ab 00 call 0xab5a5b
20: 49 8b 75 18 mov 0x18(%r13),%rsi
24: 4c 89 f7 mov %r14,%rdi
27: 4c 89 fa mov %r15,%rdx
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 4c 89 e8 mov %r13,%rax
32: 48 c1 e8 03 shr $0x3,%rax
36: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1)
3a: 74 08 je 0x44
3c: 4c 89 ef mov %r13,%rdi
3f: e8 .byte 0xe8
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] [bluetooth?] WARNING in hci_recv_frame (2)
2026-10-07 4:59 [syzbot] [bluetooth?] WARNING in hci_recv_frame (2) syzbot
@ 2026-10-18 7:19 ` syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2026-10-18 7:19 UTC (permalink / raw)
To: linux-bluetooth, linux-kernel, luiz.dentz, marcel, syzkaller-bugs
syzbot has found a reproducer for the following issue on:
HEAD commit: 32c52ec87d62 x86/insn-eval: Fix shadowed segment index in ..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=10999621580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4ccb65e03706547e
dashboard link: https://syzkaller.appspot.com/bug?extid=2344fb8002f3ef5b1712
compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17870f01580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2344fb8002f3ef5b1712@syzkaller.appspotmail.com
------------[ cut here ]------------
workqueue: cannot queue hci_rx_work on wq hci0
WARNING: kernel/workqueue.c:2353 at __queue_work+0xd93/0x10e0 kernel/workqueue.c:2352, CPU#0: syz-executor360/5620
Modules linked in:
CPU: 0 UID: 0 PID: 5620 Comm: syz-executor360 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__queue_work+0xdaf/0x10e0 kernel/workqueue.c:2352
Code: 49 81 c7 70 01 00 00 4c 8d 35 dd 08 ef 0f 48 89 f8 48 c1 e8 03 80 3c 18 00 74 05 e8 8b 37 ac 00 49 8b 75 18 4c 89 f7 4c 89 fa <67> 48 0f b9 3a 4c 89 e8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ef e8
RSP: 0018:ffffc90002bc7af8 EFLAGS: 00010046
RAX: 1ffff1100266f978 RBX: dffffc0000000000 RCX: ffff888035d04b00
RDX: ffff888013890970 RSI: ffffffff8adabbd0 RDI: ffffffff917d6fa0
RBP: 0000000000000000 R08: ffff88801337cbaf R09: 1ffff1100266f975
R10: dffffc0000000000 R11: ffffed100266f976 R12: 0000000000000008
R13: ffff88801337cba8 R14: ffffffff917d6fa0 R15: ffff888013890970
FS: 00007f02356e36c0(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056507f781b68 CR3: 000000001468d000 CR4: 0000000000352ef0
Call Trace:
<TASK>
queue_work_on+0x106/0x1d0 kernel/workqueue.c:2501
queue_work include/linux/workqueue.h:700 [inline]
hci_recv_frame+0x61e/0x7c0 net/bluetooth/hci_core.c:2946
vhci_get_user drivers/bluetooth/hci_vhci.c:530 [inline]
vhci_write+0x35d/0x4a0 drivers/bluetooth/hci_vhci.c:626
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_write+0x150/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f023773e24e
Code: 08 0f 85 05 e3 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08
RSP: 002b:00007f02356e3198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f02356e36c0 RCX: 00007f023773e24e
RDX: 0000000000000007 RSI: 00007f0237789050 RDI: 0000000000000003
RBP: 00007f0237789050 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0237789057
R13: 0000000000000000 R14: 00007ffc8187e190 R15: 00007ffc8187e278
</TASK>
----------------
Code disassembly (best guess):
0: 49 81 c7 70 01 00 00 add $0x170,%r15
7: 4c 8d 35 dd 08 ef 0f lea 0xfef08dd(%rip),%r14 # 0xfef08eb
e: 48 89 f8 mov %rdi,%rax
11: 48 c1 e8 03 shr $0x3,%rax
15: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1)
19: 74 05 je 0x20
1b: e8 8b 37 ac 00 call 0xac37ab
20: 49 8b 75 18 mov 0x18(%r13),%rsi
24: 4c 89 f7 mov %r14,%rdi
27: 4c 89 fa mov %r15,%rdx
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 4c 89 e8 mov %r13,%rax
32: 48 c1 e8 03 shr $0x3,%rax
36: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1)
3a: 74 08 je 0x44
3c: 4c 89 ef mov %r13,%rdi
3f: e8 .byte 0xe8
---
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
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