[syzbot] general protection fault in l2cap_chan_timeout (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: f4bc5bbb5fef Merge tag 'nfsd-5.17-2' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=172ce872700000
kernel config: https://syzkaller.appspot.com/x/.config?x=88e0a6a3dbf057cf
dashboard link: https://syzkaller.appspot.com/bug?extid=f0908ddc8b64b86e81f2
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1392aa3c700000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d514a4700000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f0908d...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc000000005a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000002d0-0x00000000000002d7]
CPU: 1 PID: 5789 Comm: kworker/1:2 Not tainted 5.17.0-rc3-syzkaller-00043-gf4bc5bbb5fef #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events l2cap_chan_timeout
RIP: 0010:__mutex_lock_common+0x110/0x2490 kernel/locking/mutex.c:579
Code: 38 84 c0 0f 85 26 1c 00 00 83 3d 3a c6 aa 06 00 48 8b 5c 24 08 4c 8d ac 24 c0 00 00 00 75 21 48 8d 7b 60 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 34 7e bc f7 48 39 5b 60 0f 85 b1 17 00 00
RSP: 0018:ffffc9000a4efaa0 EFLAGS: 00010206
RAX: 000000000000005a RBX: 0000000000000270 RCX: ffffffff90bf9803
RDX: dffffc0000000000 RSI: ffff888077be5700 RDI: 00000000000002d0
RBP: ffffc9000a4efc08 R08: dffffc0000000000 R09: ffffc9000a4efb60
R10: fffff5200149df71 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc9000a4efb60 R14: 0000000000000000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000140 CR3: 0000000018ada000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__mutex_lock kernel/locking/mutex.c:733 [inline]
mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:785
l2cap_chan_timeout+0x53/0x280 net/bluetooth/l2cap_core.c:422
process_one_work+0x850/0x1130 kernel/workqueue.c:2307
worker_thread+0xab1/0x1300 kernel/workqueue.c:2454
kthread+0x2a3/0x2d0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__mutex_lock_common+0x110/0x2490 kernel/locking/mutex.c:579
Code: 38 84 c0 0f 85 26 1c 00 00 83 3d 3a c6 aa 06 00 48 8b 5c 24 08 4c 8d ac 24 c0 00 00 00 75 21 48 8d 7b 60 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 34 7e bc f7 48 39 5b 60 0f 85 b1 17 00 00
RSP: 0018:ffffc9000a4efaa0 EFLAGS: 00010206
RAX: 000000000000005a RBX: 0000000000000270 RCX: ffffffff90bf9803
RDX: dffffc0000000000 RSI: ffff888077be5700 RDI: 00000000000002d0
RBP: ffffc9000a4efc08 R08: dffffc0000000000 R09: ffffc9000a4efb60
R10: fffff5200149df71 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc9000a4efb60 R14: 0000000000000000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcd341ae06d CR3: 0000000018ada000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 38 84 c0 0f 85 26 1c cmp %al,0x1c26850f(%rax,%rax,8)
7: 00 00 add %al,(%rax)
9: 83 3d 3a c6 aa 06 00 cmpl $0x0,0x6aac63a(%rip) # 0x6aac64a
10: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx
15: 4c 8d ac 24 c0 00 00 lea 0xc0(%rsp),%r13
1c: 00
1d: 75 21 jne 0x40
1f: 48 8d 7b 60 lea 0x60(%rbx),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction
2f: 74 05 je 0x36
31: e8 34 7e bc f7 callq 0xf7bc7e6a
36: 48 39 5b 60 cmp %rbx,0x60(%rbx)
3a: 0f 85 b1 17 00 00 jne 0x17f1


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[syzbot]

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***

Subject: Test
Author: yuran....@hotmail.com

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

[syzbot]

> #syz test:�https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

unknown command "test:\xa0https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git"