corrupted report (2)

[syzbot]

Hello,

syzbot hit the following crash on upstream commit
3fd14cdcc05a682b03743683ce3a726898b20555 (Fri Apr 6 19:15:41 2018 +0000)
Merge tag 'mtd/for-4.17' of git://git.infradead.org/linux-mtd
syzbot dashboard link:
https://syzkaller.appspot.com/bug?extid=56275b6e83c2fb060948

So far this crash happened 8405 times on bpf-next,
https://github.com/google/kmsan.git/master, mmots, net-next, upstream.
Unfortunately, I don't have any reproducer for this crash yet.
Raw console output:
https://syzkaller.appspot.com/x/log.txt?id=5163486380294144
Kernel config:
https://syzkaller.appspot.com/x/.config?id=-5813481738265533882
compiler: gcc (GCC) 8.0.1 20180301 (experimental)
CC: [ak...@linux-foundation.org linux-...@vger.kernel.org
penguin...@I-love.SAKURA.ne.jp vegard...@oracle.com]

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+56275b...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.

unregister_netdevice: waiting for lo to become free. Usage count = 2
unregister_netdevice: waiting for lo to become free. Usage count = 2
unregister_netdevice: waiting for lo to become free. Usage count = 2
unregister_netdevice: waiting for lo to become free. Usage count = 2
unregister_netdevice: waiting for lo to become free. Usage count = 2
Kernel panic - not syncing: hung_task: blocked tasks
CPU: 1 PID: 881 Comm: khungtaskd Not tainted 4.16.0+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1b9/0x294 lib/dump_stack.c:113
panic+0x22f/0x4de kernel/panic.c:183
check_hung_task kernel/hung_task.c:133 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0xc21/0xf60 kernel/hung_task.c:249
kthread+0x345/0x410 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzk...@googlegroups.com.

syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug
report.
Note: all commands must start from beginning of the line in the email body.
To upstream this report, please reply with:
#syz upstream

[Dmitry Vyukov]

From: syzbot <syzbot+56275b...@syzkaller.appspotmail.com>
Date: Wed, Apr 11, 2018 at 11:52 AM
To: <syzkaller-upst...@googlegroups.com>

Andrey,

We now have lots of crashes on usb fuzzer here with "[ 1306.165663][
T5528] usb 3-1: WARNING: ath10k USB support is incomplete, don't
expect anything to work!".
Please fix report parsing so that they are not detected as corrupted.
They are not corrupted.

[Andrey Konovalov]

I don't see them, where do I find them?

[Dmitry Vyukov]

From: 'Andrey Konovalov' via syzkaller-upstream-moderation
<syzkaller-upst...@googlegroups.com>
Date: Wed, May 8, 2019 at 2:23 PM
To: Dmitry Vyukov
Cc: syzbot, 'Dmitry Vyukov' via syzkaller-upstream-moderation

The dashboard link above. See crashes on "ci2-upstream-usb" instance.