Re: WARNING: suspicious RCU usage in idtentry_exit

2020-05-29 Thread Paul E. McKenney
On Fri, May 29, 2020 at 04:32:31PM +0200, Dmitry Vyukov wrote: > On Fri, May 29, 2020 at 4:05 PM Paul E. McKenney wrote: > > > > On Fri, May 29, 2020 at 08:20:12AM +0200, Dmitry Vyukov wrote: > > > On Thu, May 28, 2020 at 10:48 PM Paul E. McKenney > > > wrote: > > > > > > > > On Thu, May 28, 202

Re: WARNING: suspicious RCU usage in idtentry_exit

2020-05-29 Thread Dmitry Vyukov
On Fri, May 29, 2020 at 4:05 PM Paul E. McKenney wrote: > > On Fri, May 29, 2020 at 08:20:12AM +0200, Dmitry Vyukov wrote: > > On Thu, May 28, 2020 at 10:48 PM Paul E. McKenney > > wrote: > > > > > > On Thu, May 28, 2020 at 10:19:02PM +0200, Thomas Gleixner wrote: > > > > Paul, > > > > > > > > "

Re: WARNING: suspicious RCU usage in idtentry_exit

2020-05-29 Thread Paul E. McKenney
On Fri, May 29, 2020 at 08:20:12AM +0200, Dmitry Vyukov wrote: > On Thu, May 28, 2020 at 10:48 PM Paul E. McKenney wrote: > > > > On Thu, May 28, 2020 at 10:19:02PM +0200, Thomas Gleixner wrote: > > > Paul, > > > > > > "Paul E. McKenney" writes: > > > > On Thu, May 28, 2020 at 03:33:44PM +0200, T

Re: WARNING: suspicious RCU usage in idtentry_exit

2020-05-29 Thread Thomas Gleixner
Dmitry, Dmitry Vyukov writes: > On Thu, May 28, 2020 at 10:48 PM Paul E. McKenney wrote: >> On Thu, May 28, 2020 at 10:19:02PM +0200, Thomas Gleixner wrote: >> OK, from the .config, another suggestion is to build the kernel >> with CONFIG_RCU_EQS_DEBUG=y. This still requires that this issue be

Re: WARNING: suspicious RCU usage in idtentry_exit

2020-05-28 Thread Dmitry Vyukov
On Thu, May 28, 2020 at 10:48 PM Paul E. McKenney wrote: > > On Thu, May 28, 2020 at 10:19:02PM +0200, Thomas Gleixner wrote: > > Paul, > > > > "Paul E. McKenney" writes: > > > On Thu, May 28, 2020 at 03:33:44PM +0200, Thomas Gleixner wrote: > > >> syzbot writes: > > >> Weird. I have no idea how

Re: WARNING: suspicious RCU usage in idtentry_exit

2020-05-28 Thread Paul E. McKenney
On Thu, May 28, 2020 at 10:19:02PM +0200, Thomas Gleixner wrote: > Paul, > > "Paul E. McKenney" writes: > > On Thu, May 28, 2020 at 03:33:44PM +0200, Thomas Gleixner wrote: > >> syzbot writes: > >> Weird. I have no idea how that thing is an EQS here. > > > > No argument on the "Weird" part! ;-)

Re: WARNING: suspicious RCU usage in idtentry_exit

2020-05-28 Thread Thomas Gleixner
Paul, "Paul E. McKenney" writes: > On Thu, May 28, 2020 at 03:33:44PM +0200, Thomas Gleixner wrote: >> syzbot writes: >> Weird. I have no idea how that thing is an EQS here. > > No argument on the "Weird" part! ;-) > > Is this a NO_HZ_FULL=y kernel? No, it has only NO_HZ_IDLE. https://syzka

Re: WARNING: suspicious RCU usage in idtentry_exit

2020-05-28 Thread Paul E. McKenney
On Thu, May 28, 2020 at 03:33:44PM +0200, Thomas Gleixner wrote: > syzbot writes: > > + Paolo, Paul > > > syzbot found the following crash on: > > > > HEAD commit:7b4cb0a4 Add linux-next specific files for 20200525 > > git tree: linux-next > > console output: https://syzkaller.appspot.

Re: WARNING: suspicious RCU usage in idtentry_exit

2020-05-28 Thread Thomas Gleixner
syzbot writes: + Paolo, Paul > syzbot found the following crash on: > > HEAD commit:7b4cb0a4 Add linux-next specific files for 20200525 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1335601610 > kernel config: https://syzkaller.appspot.com/x/.c

WARNING: suspicious RCU usage in idtentry_exit

2020-05-25 Thread syzbot
Hello, syzbot found the following crash on: HEAD commit:7b4cb0a4 Add linux-next specific files for 20200525 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1335601610 kernel config: https://syzkaller.appspot.com/x/.config?x=47b0740d89299c10 dashboard