linux-kernel - Re: INFO: task hung in grab

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Date:   Wed, 18 Jul 2018 21:53:28 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Ron Minnich <rminnich@...dia.gov>,
        Latchesar Ionkov <lucho@...kov.net>,
        v9fs-developer@...ts.sourceforge.net
Cc:     syzbot <syzbot+f425456ea8aa16b40d20@...kaller.appspotmail.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: INFO: task hung in grab_super

On 2018/07/18 20:41, Dmitry Vyukov wrote:
> This seems to be related to 9p. After rerunning the log I got:
> 
> root@...kaller:~# ps afxu | grep syz
> root     18253  0.0  0.0      0     0 ttyS0    Zl   10:16   0:00  \_
> [syz-executor] <defunct>
> root@...kaller:~# cat /proc/18253/task/*/stack
> [<0>] p9_client_rpc+0x3a2/0x1400
> [<0>] p9_client_flush+0x134/0x2a0
> [<0>] p9_client_rpc+0x122c/0x1400
> [<0>] p9_client_create+0xc56/0x16af
> [<0>] v9fs_session_init+0x21a/0x1a80
> [<0>] v9fs_mount+0x7c/0x900
> [<0>] mount_fs+0xae/0x328
> [<0>] vfs_kern_mount.part.34+0xdc/0x4e0
> [<0>] do_mount+0x581/0x30e0
> [<0>] ksys_mount+0x12d/0x140
> [<0>] __x64_sys_mount+0xbe/0x150
> [<0>] do_syscall_64+0x1b9/0x820
> [<0>] entry_SYSCALL_64_after_hwframe+0x49/0xbe
> [<0>] 0xffffffffffffffff
> 
> There is a bunch of hangs in 9p, so let's do:
> 
> #syz dup: INFO: task hung in flush_work
> 
Then, is dumping all threads when khungtaskd fires a candidate
for CONFIG_DEBUG_AID_FOR_SYZBOT=y path?