linux-kernel - Re: [syzbot] [bcachefs?] WARNING in discard_new

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Message-ID: <4rzqsege6o4chfyrldyghjytgl5kxt24zw33ilglcyxixlgpvi@dabfrcbbbptd>
Date: Fri, 16 Aug 2024 12:45:31 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Aleksandr Nogikh <nogikh@...gle.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>, linux-bcachefs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] WARNING in discard_new_inode

On Fri, Aug 16, 2024 at 06:43:38PM GMT, Aleksandr Nogikh wrote:
> On Fri, Aug 16, 2024 at 6:30 PM Kent Overstreet
> <kent.overstreet@...ux.dev> wrote:
> >
> > On Fri, Aug 16, 2024 at 02:50:23AM GMT, syzbot wrote:
> > > Hello,
> > >
> > > syzbot found the following issue on:
> > >
> > > HEAD commit:    d7a5aa4b3c00 Merge tag 'perf-tools-fixes-for-v6.11-2024-08..
> > > git tree:       upstream
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=131e27c5980000
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=7229118d88b4a71b
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=95e40eae71609e40d851
> > > compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> > > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=150be3c5980000
> > > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=165c93cb980000
> > >
> > > Downloadable assets:
> > > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-d7a5aa4b.raw.xz
> > > vmlinux: https://storage.googleapis.com/syzbot-assets/af15738cca6c/vmlinux-d7a5aa4b.xz
> > > kernel image: https://storage.googleapis.com/syzbot-assets/62dacb1384ee/bzImage-d7a5aa4b.xz
> > > mounted in repro: https://storage.googleapis.com/syzbot-assets/92de1b01cc1a/mount_0.gz
> > >
> > > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > > Reported-by: syzbot+95e40eae71609e40d851@...kaller.appspotmail.com
> > >
> > > R13: 00007f7d2a233210 R14: 0000000000000001 R15: 0032656c69662f2e
> > >  </TASK>
> >
> > Dmitry, this bug has been fixed upstream, and I've been seeing others
> > where syzbot appears to be generating reports for bugs that have been
> > fixed (e.g. BUG() in bch2_fs_journal_stop() long after that was changed
> > to a warning).
> >
> > I don't know what's going on, but the report appears to be in error.
> 
> Did those fixes already reach the latest torvalds?
> I've just tried to run the C reproducer from the report on
> d7a5aa4b3c00 several times and it eventually did crash the kernel.
> 
> [   42.746251][ T5239] ------------[ cut here ]------------
> [   42.747210][ T5239] WARNING: CPU: 0 PID: 5239 at fs/inode.c:1143
> discard_new_inode+0x217/0x2a0
> [   42.748401][ T5239] Modules linked in:
> [   42.748948][ T5239] CPU: 0 UID: 0 PID: 5239 Comm: repro Not tainted
> 6.11.0-rc3-syzkaller-00156-gd7a5aa4b3c00 #0
> [   42.750331][ T5239] Hardware name: QEMU Standard PC (Q35 + ICH9,
> 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
> [   42.751806][ T5239] RIP: 0010:discard_new_inode+0x217/0x2a0

found it, i_state != i_flags - sorry to bother you guys :)