Re: INFO: task hung in grab_super

2018-11-02 Thread Dominique Martinet
Dmitry Vyukov wrote on Fri, Nov 02, 2018: > >> I guess that's the problem, right? SIGKILL-ed task must not ignore > >> SIGKILL and hang in infinite loop. This would explain a bunch of hangs > >> in 9p. > > > > Did you check /proc/18253/task/*/stack after manually sending SIGKILL? > > Yes: > > roo

Re: INFO: task hung in grab_super

2018-11-02 Thread Dmitry Vyukov
On Wed, Jul 18, 2018 at 4:17 PM, Tetsuo Handa wrote: > On 2018/07/18 23:11, Dmitry Vyukov wrote: >> On Wed, Jul 18, 2018 at 3:35 PM, Tetsuo Handa >> wrote: >> This seems to be related to 9p. After rerunning the log I got: >> >> root@syzkaller:~# ps afxu | grep syz >> root 1825

Re: INFO: task hung in grab_super

2018-07-18 Thread Tetsuo Handa
On 2018/07/18 23:11, Dmitry Vyukov wrote: > On Wed, Jul 18, 2018 at 3:35 PM, Tetsuo Handa > wrote: > This seems to be related to 9p. After rerunning the log I got: > > root@syzkaller:~# ps afxu | grep syz > root 18253 0.0 0.0 0 0 ttyS0Zl 10:16 0:00 \_ >

Re: INFO: task hung in grab_super

2018-07-18 Thread Dmitry Vyukov
On Wed, Jul 18, 2018 at 3:35 PM, Tetsuo Handa wrote: This seems to be related to 9p. After rerunning the log I got: root@syzkaller:~# ps afxu | grep syz root 18253 0.0 0.0 0 0 ttyS0Zl 10:16 0:00 \_ [syz-executor] root@syzkaller:~# cat /proc/18

Re: INFO: task hung in grab_super

2018-07-18 Thread Tetsuo Handa
On 2018/07/18 22:04, Dmitry Vyukov wrote: > On Wed, Jul 18, 2018 at 2:53 PM, Tetsuo Handa > wrote: >> On 2018/07/18 20:41, Dmitry Vyukov wrote: >>> This seems to be related to 9p. After rerunning the log I got: >>> >>> root@syzkaller:~# ps afxu | grep syz >>> root 18253 0.0 0.0 0 0

Re: INFO: task hung in grab_super

2018-07-18 Thread Dmitry Vyukov
On Wed, Jul 18, 2018 at 2:53 PM, Tetsuo Handa wrote: > On 2018/07/18 20:41, Dmitry Vyukov wrote: >> This seems to be related to 9p. After rerunning the log I got: >> >> root@syzkaller:~# ps afxu | grep syz >> root 18253 0.0 0.0 0 0 ttyS0Zl 10:16 0:00 \_ >> [syz-executor] >

Re: INFO: task hung in grab_super

2018-07-18 Thread Tetsuo Handa
On 2018/07/18 20:41, Dmitry Vyukov wrote: > This seems to be related to 9p. After rerunning the log I got: > > root@syzkaller:~# ps afxu | grep syz > root 18253 0.0 0.0 0 0 ttyS0Zl 10:16 0:00 \_ > [syz-executor] > root@syzkaller:~# cat /proc/18253/task/*/stack > [<0>] p9_c

Re: INFO: task hung in grab_super

2018-07-18 Thread Dmitry Vyukov
On Wed, Jul 18, 2018 at 1:02 PM, Dmitry Vyukov wrote: > On Wed, Jul 18, 2018 at 12:49 PM, Tetsuo Handa > wrote: >> Dmitry, >> >> this is yet another example of stalling inside __bread_gfp(). >> >> Can you find all reports where NMI backtrace contains __bread_gfp ? >> >> I need to wget all reports

Re: INFO: task hung in grab_super

2018-07-18 Thread Dmitry Vyukov
On Wed, Jul 18, 2018 at 12:49 PM, Tetsuo Handa wrote: > Dmitry, > > this is yet another example of stalling inside __bread_gfp(). > > Can you find all reports where NMI backtrace contains __bread_gfp ? > > I need to wget all reports if I try to do that on my side. > If you can locally grep on your

Re: INFO: task hung in grab_super

2018-07-18 Thread Tetsuo Handa
Dmitry, this is yet another example of stalling inside __bread_gfp(). Can you find all reports where NMI backtrace contains __bread_gfp ? I need to wget all reports if I try to do that on my side. If you can locally grep on your side, it will be nice. On 2018/07/18 19:38, syzbot wrote: > CPU: 1