Re: possible deadlock in __generic_file_fsync

2019-03-26 Thread Dmitry Vyukov
On Sat, Mar 23, 2019 at 2:56 PM Theodore Ts'o wrote: > > On Sat, Mar 23, 2019 at 08:16:36AM +0100, Dmitry Vyukov wrote: > > > > This is a lockdep-detected bug, but it is reproduced with very low > > probability... > > > > I would expect that for lockdep it's only enough to trigger each path > > in

Re: possible deadlock in __generic_file_fsync

2019-03-23 Thread Theodore Ts'o
On Sat, Mar 23, 2019 at 08:16:36AM +0100, Dmitry Vyukov wrote: > > This is a lockdep-detected bug, but it is reproduced with very low > probability... > > I would expect that for lockdep it's only enough to trigger each path > involved in the deadlock once. Why is it so hard to reproduce then? Is

Re: possible deadlock in __generic_file_fsync

2019-03-23 Thread Dmitry Vyukov
/pub/scm/linux/kernel/git/tj/wq") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection This is a lockdep-detected bug, but it is reproduced with very low probability: testing commit 270b77a0f30e7bc61a9081b86d74dbb62fa6a69d with gcc (GCC) 8.1.0 run #0: crashed: pos

Re: possible deadlock in __generic_file_fsync

2019-03-22 Thread syzbot
syzbot has bisected this bug to: commit 9022ada8ab6f1f1a932a3c93815061042e6548a5 Author: Linus Torvalds Date: Fri Aug 24 20:16:36 2018 + Merge branch 'for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1533

Re: possible deadlock in __generic_file_fsync

2018-10-20 Thread syzbot
syzbot has found a reproducer for the following crash on: HEAD commit:270b77a0f30e Merge tag 'drm-fixes-2018-10-20-1' of git://a.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=146f4ad940 kernel config: https://syzkaller.appspot.com/x/.config?x=b3f55c

Re: possible deadlock in __generic_file_fsync

2018-10-18 Thread syzbot
syzbot has found a reproducer for the following crash on: HEAD commit:fa520c47eaa1 fscache: Fix out of bound read in long cookie.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=130da8ee40 kernel config: https://syzkaller.appspot.com/x/.config?x=b3f55c

possible deadlock in __generic_file_fsync

2018-10-16 Thread syzbot
Hello, syzbot found the following crash on: HEAD commit:6d5d82417dd6 Add linux-next specific files for 20181016 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10c8e49540 kernel config: https://syzkaller.appspot.com/x/.config?x=4e55f86f01cf5131 dashb