WARNING in hci_conn

syzbot

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Aug 1, 2020, 2:55:21 PM8/1/20

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Hello,

syzbot found the following issue on:

HEAD commit: 7dc6fd0f Merge branch 'i2c/for-current' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12a70832900000
kernel config: https://syzkaller.appspot.com/x/.config?x=e59ee776d5aa8d55
dashboard link: https://syzkaller.appspot.com/bug?extid=2446dd3cb07277388db6
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13f781d4900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116a0c14900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2446dd...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 6953 at net/bluetooth/hci_conn.c:412 hci_conn_timeout+0x20f/0x290 net/bluetooth/hci_conn.c:412
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 6953 Comm: kworker/u5:2 Not tainted 5.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 hci_conn_timeout
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1f0/0x31e lib/dump_stack.c:118
panic+0x264/0x7a0 kernel/panic.c:231
__warn+0x227/0x250 kernel/panic.c:600
report_bug+0x1b1/0x2e0 lib/bug.c:198
handle_bug+0x42/0x80 arch/x86/kernel/traps.c:235
exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:255
asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:540
RIP: 0010:hci_conn_timeout+0x20f/0x290 net/bluetooth/hci_conn.c:412
Code: c7 50 4d 8d 89 e8 71 d0 5f fa 48 8b 35 6a 7c 39 02 bf 40 00 00 00 4c 89 f2 5b 41 5c 41 5e 41 5f e9 46 69 f8 f9 e8 61 c1 20 fa <0f> 0b e9 5c fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 1a fe ff
RSP: 0018:ffffc90001577cc8 EFLAGS: 00010293
RAX: ffffffff8753d0ff RBX: 00000000ffffffff RCX: ffff888092948440
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffff8880a9b7b008 R08: ffffffff8753cf3b R09: ffffed1010da5003
R10: ffffed1010da5003 R11: 0000000000000000 R12: ffff8880a7290d00
R13: ffff8880a7290d18 R14: ffff888086d28128 R15: dffffc0000000000
process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Kernel Offset: disabled
Rebooting in 86400 seconds..

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syzbot

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Aug 1, 2020, 6:56:10 PM8/1/20

to core...@netfilter.org, da...@davemloft.net, de...@driverdev.osuosl.org, for...@alittletooquiet.net, gre...@linuxfoundation.org, johan....@gmail.com, ka...@trash.net, kad...@blackhole.kfki.hu, ku...@kernel.org, linux-b...@vger.kernel.org, linux-...@vger.kernel.org, mar...@holtmann.org, net...@vger.kernel.org, netfilt...@vger.kernel.org, pa...@netfilter.org, rvars...@gmail.com, syzkall...@googlegroups.com

syzbot has bisected this issue to:

commit 3d30311c0e4d834c94e6a27d6242a942d6a76b85
Author: Varsha Rao <rvars...@gmail.com>
Date: Sun Oct 9 11:13:56 2016 +0000

staging: vt6655: Removes unnecessary blank lines.

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17023a14900000
start commit: 7dc6fd0f Merge branch 'i2c/for-current' of git://git.kerne..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=14823a14900000
console output: https://syzkaller.appspot.com/x/log.txt?x=10823a14900000

kernel config: https://syzkaller.appspot.com/x/.config?x=e59ee776d5aa8d55
dashboard link: https://syzkaller.appspot.com/bug?extid=2446dd3cb07277388db6

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13f781d4900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116a0c14900000

Reported-by: syzbot+2446dd...@syzkaller.appspotmail.com
Fixes: 3d30311c0e4d ("staging: vt6655: Removes unnecessary blank lines.")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Greg KH

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Aug 2, 2020, 2:30:56 AM8/2/20

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On Sat, Aug 01, 2020 at 03:56:09PM -0700, syzbot wrote:
> syzbot has bisected this issue to:
>
> commit 3d30311c0e4d834c94e6a27d6242a942d6a76b85
> Author: Varsha Rao <rvars...@gmail.com>
> Date: Sun Oct 9 11:13:56 2016 +0000
>
> staging: vt6655: Removes unnecessary blank lines.

I doubt this is the real issue :(

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WARNING in hci_conn_timeout

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Greg KH