On Thu, Apr 5, 2018 at 10:22 AM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > On Thu, Apr 5, 2018 at 5:24 AM, Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: >> On Wed, Apr 04, 2018 at 11:22:00PM -0400, Theodore Y. Ts'o wrote: >>> On Wed, Apr 04, 2018 at 12:35:04PM -0700, Matthew Wilcox wrote: >>> > On Wed, Apr 04, 2018 at 09:24:05PM +0200, Dmitry Vyukov wrote: >>> > > On Tue, Apr 3, 2018 at 4:01 AM, syzbot >>> > > <syzbot+dc5ab2babdf22ca091af@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: >>> > > > DEBUG_LOCKS_WARN_ON(sem->owner != get_current()) >>> > > > WARNING: CPU: 1 PID: 4441 at kernel/locking/rwsem.c:133 up_write+0x1cc/0x210 >>> > > > kernel/locking/rwsem.c:133 >>> > > > Kernel panic - not syncing: panic_on_warn set ... >>> > >>> > Message-Id: <1522852646-2196-1-git-send-email-longman@xxxxxxxxxx> >>> > >>> >>> We were way ahead of syzbot in this case. :-) >> >> Not really ... syzbot caught it Monday evening ;-) >> >> Date: Mon, 02 Apr 2018 19:01:01 -0700 >> From: syzbot <syzbot+dc5ab2babdf22ca091af@xxxxxxxxxxxxxxxxxxxxxxxxx> >> To: linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, >> syzkaller-bugs@xxxxxxxxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx >> Subject: WARNING in up_write > > :) > > #syz fix: locking/rwsem: Add up_write_non_owner() for percpu_up_write() The title was later changed to: #syz fix: locking/rwsem: Add a new RWSEM_ANONYMOUSLY_OWNED flag
