On Tue, Sep 15, 2020 at 10:26:26AM +0300, Nikolay Borisov wrote: > > > On 15.09.20 г. 7:59 ч., syzbot wrote: > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: 7fe10096 Merge branch 'linus' of git://git.kernel.org/pub/.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=140b0853900000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=a9075b36a6ae26c9 > > dashboard link: https://syzkaller.appspot.com/bug?extid=738cca7d7d9754493513 > > compiler: gcc (GCC) 10.1.0-syz 20200507 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=108d45a5900000 > > > > The issue was bisected to: > > > > commit 6a3c7f5c87854e948c3c234e5f5e745c7c553722 > > Author: Nikolay Borisov <nborisov@xxxxxxxx> > > Date: Thu May 28 08:05:13 2020 +0000 > > > > btrfs: don't balance btree inode pages from buffered write path > > > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14884d21900000 > > final oops: https://syzkaller.appspot.com/x/report.txt?x=16884d21900000 > > console output: https://syzkaller.appspot.com/x/log.txt?x=12884d21900000 > > > Unlikely, that patch does change the performance characteristics because > now we don't balance metadata when doing buffered writes but I don't see > how it can lead to a hang. Yeah, this patch once got pointed to by syzbot bisection supposedly causing bug in a completely unrelated subsystem, but it's more likely that it's making the bisection unreliable. https://lore.kernel.org/lkml/20200811065013.GI2026@xxxxxxxxxxxxx/
