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Date:   Tue, 27 Sep 2022 19:14:46 -0700
Message-ID: <0000000000001a6b6705e9b3533d@google.com>
Subject: [syzbot] WARNING in nilfs_segctor_do_construct
From:   syzbot <syzbot+fbb3e0b24e8dae5a16ee@syzkaller.appspotmail.com>
To:     konishi.ryusuke@gmail.com, linux-kernel@vger.kernel.org,
        linux-nilfs@vger.kernel.org, syzkaller-bugs@googlegroups.com
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Hello,

syzbot found the following issue on:

HEAD commit:    aaa11ce2ffc8 Add linux-next specific files for 20220923
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17870cdf080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=186d1ff305f10294
dashboard link: https://syzkaller.appspot.com/bug?extid=fbb3e0b24e8dae5a16ee
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

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

------------[ cut here ]------------
WARNING: CPU: 1 PID: 3320 at fs/nilfs2/segment.c:879 nilfs_segctor_create_checkpoint fs/nilfs2/segment.c:879 [inline]
WARNING: CPU: 1 PID: 3320 at fs/nilfs2/segment.c:879 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1197 [inline]
WARNING: CPU: 1 PID: 3320 at fs/nilfs2/segment.c:879 nilfs_segctor_collect fs/nilfs2/segment.c:1497 [inline]
WARNING: CPU: 1 PID: 3320 at fs/nilfs2/segment.c:879 nilfs_segctor_do_construct+0x45ac/0x69b0 fs/nilfs2/segment.c:2039
Modules linked in:
CPU: 1 PID: 3320 Comm: segctord Not tainted 6.0.0-rc6-next-20220923-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
RIP: 0010:nilfs_segctor_create_checkpoint fs/nilfs2/segment.c:879 [inline]
RIP: 0010:nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1197 [inline]
RIP: 0010:nilfs_segctor_collect fs/nilfs2/segment.c:1497 [inline]
RIP: 0010:nilfs_segctor_do_construct+0x45ac/0x69b0 fs/nilfs2/segment.c:2039
Code: ff ff e8 27 7b 55 fe 41 83 fc ea 74 18 e8 4c 7e 55 fe 44 89 e6 bf fe ff ff ff e8 0f 7b 55 fe 41 83 fc fe 75 07 e8 34 7e 55 fe <0f> 0b e8 2d 7e 55 fe e9 3c de ff ff e8 23 7e 55 fe 48 8b 44 24 30
RSP: 0018:ffffc9000b897b40 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888030627000 RCX: 0000000000000000
RDX: ffff88802da60000 RSI: ffffffff832715cc RDI: 0000000000000005
RBP: ffff8880306272d0 R08: 0000000000000005 R09: 00000000fffffffe
R10: 00000000fffffffe R11: 0000000000000001 R12: 00000000fffffffe
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888021df8800
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8bbee45fc8 CR3: 0000000032ce7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2373
 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2481 [inline]
 nilfs_segctor_thread+0x3c3/0xf30 fs/nilfs2/segment.c:2564
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>


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