From: David Sterba <dsterba@suse.cz>
To: syzbot <syzbot+adec8406ad17413d4c06@syzkaller.appspotmail.com>
Cc: shuah@kernel.org, syzkaller-bugs@googlegroups.com,
josef@toxicpanda.com, linux-kernel@vger.kernel.org, clm@fb.com,
npiggin@gmail.com, linux-kselftest@vger.kernel.org,
ye.xingchen@zte.com.cn, dsterba@suse.com,
linuxppc-dev@lists.ozlabs.org, linux-btrfs@vger.kernel.org
Subject: Re: [syzbot] WARNING in btrfs_free_reserved_data_space_noquota
Date: Thu, 16 May 2024 17:38:54 +0200 [thread overview]
Message-ID: <20240516153854.GE4449@suse.cz> (raw)
In-Reply-To: <000000000000fac82605ee97fb72@google.com>
On Tue, Nov 29, 2022 at 12:43:38AM -0800, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: b7b275e60bcd Linux 6.1-rc7
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=158a7b73880000
> kernel config: https://syzkaller.appspot.com/x/.config?x=2325e409a9a893e1
> dashboard link: https://syzkaller.appspot.com/bug?extid=adec8406ad17413d4c06
> compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=169ccb75880000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17bf7153880000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/525233126d34/disk-b7b275e6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/e8299bf41400/vmlinux-b7b275e6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/eebf691dbf6f/bzImage-b7b275e6.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/5423c2d2ad62/mount_0.gz
>
> The issue was bisected to:
>
> commit c814bf958926ff45a9c1e899bd001006ab6cfbae
> Author: ye xingchen <ye.xingchen@zte.com.cn>
> Date: Tue Aug 16 10:51:06 2022 +0000
>
> powerpc/selftests: Use timersub() for gettimeofday()
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=118c3d03880000
> final oops: https://syzkaller.appspot.com/x/report.txt?x=138c3d03880000
> console output: https://syzkaller.appspot.com/x/log.txt?x=158c3d03880000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+adec8406ad17413d4c06@syzkaller.appspotmail.com
> Fixes: c814bf958926 ("powerpc/selftests: Use timersub() for gettimeofday()")
>
> RDX: 0000000000000001 RSI: 0000000020000280 RDI: 0000000000000005
> RBP: 00007ffd32e91c70 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000008000000 R11: 0000000000000246 R12: 0000000000000006
> R13: 00007ffd32e91cb0 R14: 00007ffd32e91c90 R15: 0000000000000006
> </TASK>
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 3764 at fs/btrfs/space-info.h:122 btrfs_space_info_free_bytes_may_use fs/btrfs/space-info.h:154 [inline]
> WARNING: CPU: 1 PID: 3764 at fs/btrfs/space-info.h:122 btrfs_free_reserved_data_space_noquota+0x219/0x2b0 fs/btrfs/delalloc-space.c:179
Most likely fixed by 9e65bfca24cf1d ("btrfs: fix
qgroup_free_reserved_data int overflow"), it's an 32bit type overflow
that can cause various accounting errors, the function names match the
context.
#syz fix: btrfs: fix qgroup_free_reserved_data int overflow
prev parent reply other threads:[~2024-05-16 15:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-29 8:43 [syzbot] WARNING in btrfs_free_reserved_data_space_noquota syzbot
2022-11-30 10:35 ` Michael Ellerman
2023-08-01 9:27 ` [syzbot] [btrfs?] " syzbot
2024-05-16 15:38 ` David Sterba [this message]
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