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Date:   Fri, 09 Dec 2022 16:57:36 -0800
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Message-ID: <0000000000008eac3f05ef6ec145@google.com>
Subject: Re: [syzbot] WARNING in nilfs_segctor_do_construct
From:   syzbot <syzbot+fbb3e0b24e8dae5a16ee@syzkaller.appspotmail.com>
To:     akpm@linux-foundation.org, gregkh@linuxfoundation.org,
        konishi.ryusuke@gmail.com, linux-kernel@vger.kernel.org,
        linux-nilfs@vger.kernel.org, stable-commits@vger.kernel.org,
        stable@vger.kernel.org, syzkaller-bugs@googlegroups.com
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Precedence: bulk

syzbot has found a reproducer for the following issue on:

HEAD commit:    a5541c0811a0 Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=15c56bdb880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cbd4e584773e9397
dashboard link: https://syzkaller.appspot.com/bug?extid=fbb3e0b24e8dae5a16ee
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14caa71d880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1032f2b7880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4b7702208fb9/disk-a5541c08.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9ec0153ec051/vmlinux-a5541c08.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6f8725ad290a/Image-a5541c08.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/0911b0ec76cf/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fbb3e0b24e8dae5a16ee@syzkaller.appspotmail.com

NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop0): nilfs_sufile_update: invalid segment number: 53
------------[ cut here ]------------
WARNING: CPU: 0 PID: 3149 at fs/nilfs2/segment.c:1482 nilfs_segctor_truncate_segments fs/nilfs2/segment.c:1482 [inline]
WARNING: CPU: 0 PID: 3149 at fs/nilfs2/segment.c:1482 nilfs_segctor_collect fs/nilfs2/segment.c:1534 [inline]
WARNING: CPU: 0 PID: 3149 at fs/nilfs2/segment.c:1482 nilfs_segctor_do_construct+0x6cc/0xefc fs/nilfs2/segment.c:2045
Modules linked in:
CPU: 0 PID: 3149 Comm: segctord Not tainted 6.1.0-rc8-syzkaller-33330-ga5541c0811a0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : nilfs_segctor_truncate_segments fs/nilfs2/segment.c:1482 [inline]
pc : nilfs_segctor_collect fs/nilfs2/segment.c:1534 [inline]
pc : nilfs_segctor_do_construct+0x6cc/0xefc fs/nilfs2/segment.c:2045
lr : nilfs_segctor_truncate_segments fs/nilfs2/segment.c:1482 [inline]
lr : nilfs_segctor_collect fs/nilfs2/segment.c:1534 [inline]
lr : nilfs_segctor_do_construct+0x6cc/0xefc fs/nilfs2/segment.c:2045
sp : ffff800012f6bc80
x29: ffff800012f6bd00 x28: ffff800008f744fc x27: ffff0000c6cf9128
x26: ffff0000c6cf9258 x25: ffff0000c9039138 x24: ffff0000ca797818
x23: ffff0000c90390b8 x22: 00000000ffffffea x21: 0000000000000001
x20: ffff0000cb9a8000 x19: ffff0000c9039000 x18: 000000000000027f
x17: 0000000000000000 x16: ffff80000dbe6158 x15: ffff0000c6508000
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c6508000
x11: ff80800008f68d3c x10: 0000000000000000 x9 : ffff800008f68d3c
x8 : ffff0000c6508000 x7 : ffff80000816678c x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff0001fefbecd0 x1 : 00000000ffffffea x0 : 0000000000000000
Call trace:
 nilfs_segctor_truncate_segments fs/nilfs2/segment.c:1482 [inline]
 nilfs_segctor_collect fs/nilfs2/segment.c:1534 [inline]
 nilfs_segctor_do_construct+0x6cc/0xefc fs/nilfs2/segment.c:2045
 nilfs_segctor_construct+0xa0/0x380 fs/nilfs2/segment.c:2379
 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline]
 nilfs_segctor_thread+0x180/0x634 fs/nilfs2/segment.c:2570
 kthread+0x12c/0x158 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:863
irq event stamp: 8892
hardirqs last  enabled at (8891): [<ffff80000816681c>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1366 [inline]
hardirqs last  enabled at (8891): [<ffff80000816681c>] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4968
hardirqs last disabled at (8892): [<ffff80000c084084>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (8698): [<ffff8000080102e4>] _stext+0x2e4/0x37c
softirqs last disabled at (8677): [<ffff800008017c88>] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80
---[ end trace 0000000000000000 ]---