linux-kernel - Re: kernel BUG at fs/f2fs/node.c:LINE!

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Date:   Tue, 24 Apr 2018 10:27:59 -0600
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+d154ec99402c6f628887@...kaller.appspotmail.com>,
        linux-f2fs-devel@...ts.sourceforge.net,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        yuchao0@...wei.com
Subject: Re: kernel BUG at fs/f2fs/node.c:LINE!

On 04/24, Dmitry Vyukov wrote:
> On Tue, Apr 24, 2018 at 8:42 AM, syzbot
> <syzbot+d154ec99402c6f628887@...kaller.appspotmail.com> wrote:
> > Hello,
> >
> > syzbot tried to test the proposed patch but build/boot failed:
> >
> > failed to create VM pool: failed to create GCE image: failed to get create
> > image operation operation-1524552040215-56a926ecc71d9-3edfeb8b-8abca81c:
> > googleapi: Error 403: Rate Limit Exceeded, rateLimitExceeded
> >
> >
> > Tested on git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/dev
> > commit
> > b549e322861b99f1862fb5f08dfb5e5753a38635 (Sat Apr 21 06:44:59 2018 +0000)
> > f2fs: check cap_resource only for data blocks
> >
> > compiler: gcc (GCC) 8.0.1 20180413 (experimental)
> > Patch: https://syzkaller.appspot.com/x/patch.diff?id=5565179303559168
> > Kernel config:
> > https://syzkaller.appspot.com/x/.config?id=1808800213120130118
> 
> Hi Jaegeuk,
> 
> Re the last failure (rate limiting), now should be fixed with:
> https://github.com/google/syzkaller/commit/e2f4bf8f3818d49baf0f3789add75d5fd506ad8d
> which adds some backoff-and-retry logic.
> 
> Re the first one, do I understand it correctly that dev-test already
> contains the fix that you want to test?
> We did not foresee such case initially, but you are not the first one
> to try this. I've added support for testing without a patch now:
> https://github.com/google/syzkaller/commit/9366d03f001170479319878905031f63d4377c46
> and updated the docs:
> https://github.com/google/syzkaller/blob/master/docs/syzbot.md#testing-patches
> 
> So now this should work:
> 
> #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git
> dev-test

Cool! Thank you so much.