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

[syzbot <syzbot+2344fb8002f3ef5b1712@syzkaller.appspotmail.com>]

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

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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


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