Re: WARNING in check_flush_dependency
On Mon, 2018-02-19 at 19:58 +0100, Dmitry Vyukov wrote: > > > Yeah, we clearly shouldn't have WQ_RECLAIM set on this workqueue... > > Hi Johannes, > > Do you mind to send a patch to fix this? Yeah, sorry, I've been behind on patches a bit. I just applied it today, and once I've let it sit for a day for build bot etc. I'll send it up. Let me double-check I've added the syzbot annotation to it though ... johannes
Re: WARNING in check_flush_dependency
On Wed, Jan 24, 2018 at 8:39 AM, Johannes Berg wrote: > On Mon, 2018-01-22 at 23:39 -0800, syzbot wrote: >> Hello, >> >> syzbot hit the following crash on upstream commit >> 0d665e7b109d512b7cae3ccef6e8654714887844 (Fri Jan 19 12:49:24 2018 +) >> mm, page_vma_mapped: Drop faulty pointer arithmetics in check_pte() >> >> So far this crash happened 23 times on net-next, upstream. >> C reproducer is attached. >> syzkaller reproducer is attached. >> Raw console output is attached. >> compiler: gcc (GCC) 7.1.1 20170620 >> .config is attached. >> user-space arch: i386 >> >> IMPORTANT: if you fix the bug, please add the following tag to the commit: >> Reported-by: syzbot+41cdaf4232c50e658...@syzkaller.appspotmail.com >> It will help syzbot understand when the bug is fixed. See footer for >> details. >> If you forward the report, please keep this part and the footer. >> >> [ cut here ] >> workqueue: WQ_MEM_RECLAIM hwsim_wq:destroy_radio is >> flushing !WQ_MEM_RECLAIM events_highpri:flush_backlog >> WARNING: CPU: 0 PID: 3706 at kernel/workqueue.c:2439 >> check_flush_dependency+0x239/0x380 kernel/workqueue.c:2435 >> Kernel panic - not syncing: panic_on_warn set ... > > Yeah, we clearly shouldn't have WQ_RECLAIM set on this workqueue... Hi Johannes, Do you mind to send a patch to fix this?
Re: WARNING in check_flush_dependency
On Mon, 2018-01-22 at 23:39 -0800, syzbot wrote: > Hello, > > syzbot hit the following crash on upstream commit > 0d665e7b109d512b7cae3ccef6e8654714887844 (Fri Jan 19 12:49:24 2018 +) > mm, page_vma_mapped: Drop faulty pointer arithmetics in check_pte() > > So far this crash happened 23 times on net-next, upstream. > C reproducer is attached. > syzkaller reproducer is attached. > Raw console output is attached. > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached. > user-space arch: i386 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+41cdaf4232c50e658...@syzkaller.appspotmail.com > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. > > [ cut here ] > workqueue: WQ_MEM_RECLAIM hwsim_wq:destroy_radio is > flushing !WQ_MEM_RECLAIM events_highpri:flush_backlog > WARNING: CPU: 0 PID: 3706 at kernel/workqueue.c:2439 > check_flush_dependency+0x239/0x380 kernel/workqueue.c:2435 > Kernel panic - not syncing: panic_on_warn set ... Yeah, we clearly shouldn't have WQ_RECLAIM set on this workqueue... johannes