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SubjectRe: INFO: task hung in vfs_setxattr (3)
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@suse.com>
> > 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@twin.jikos.cz/

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