Please ignore this patch. The bug seems to be fixed by https://github.com/google/syzkaller/commit/06c33b3af0ff4072fb002879f83077c9d162a224 . On 2018/07/12 14:53, Tetsuo Handa wrote: > This is a temporary patch which should not go to linux.git. > > syzbot is hitting hung task problems at __sb_start_write() [1]. > atomic_long_read(&sem->rw_sem.count) says that percpu_down_read() was > blocked because somebody has called percpu_down_write(). But since we > believe that syzbot is not doing ioctl(FIFREEZE) requests, let's check > who is calling percpu_down_write() from freeze_super(). > > Since it is impossible to reproduce this problem locally, this patch was > made in order to test linux-next.git using syzbot infrastructure (and will > be removed after the culprit is found). > > [1] https://syzkaller.appspot.com/bug?id=287aa8708bc940d0ca1645223c53dd4c2d203be6 > > Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> > Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> > Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
