linux-kernel - [syzbot] WARNING in gfs2_check_blk

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Date:   Sun, 11 Dec 2022 23:03:02 -0800
From:   syzbot <syzbot+092b28923eb79e0f3c41@...kaller.appspotmail.com>
To:     agruenba@...hat.com, cluster-devel@...hat.com,
        linux-kernel@...r.kernel.org, rpeterso@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] WARNING in gfs2_check_blk_type

Hello,

syzbot found the following issue on:

HEAD commit:    4cee37b3a4e6 Merge tag 'mm-hotfixes-stable-2022-12-10-1' o..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=14da950b880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d58e7fe7f9cf5e24
dashboard link: https://syzkaller.appspot.com/bug?extid=092b28923eb79e0f3c41
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=14f12ddb880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10ebee1f880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/051fc9a10d4a/disk-4cee37b3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c40b15750245/vmlinux-4cee37b3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a25e4bc102fa/bzImage-4cee37b3.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/f10d144677a2/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+092b28923eb79e0f3c41@...kaller.appspotmail.com

gfs2: fsid=syz:syz.0: first mount done, others may mount
------------[ cut here ]------------
WARNING: CPU: 0 PID: 3635 at fs/gfs2/rgrp.c:2628 gfs2_rbm_from_block fs/gfs2/rgrp.c:279 [inline]
WARNING: CPU: 0 PID: 3635 at fs/gfs2/rgrp.c:2628 gfs2_check_blk_type+0x43d/0x660 fs/gfs2/rgrp.c:2627
Modules linked in:
CPU: 0 PID: 3635 Comm: syz-executor328 Not tainted 6.1.0-rc8-syzkaller-00164-g4cee37b3a4e6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:gfs2_check_blk_type+0x43d/0x660 fs/gfs2/rgrp.c:2628
Code: 85 c6 01 00 00 8b 1b 89 df 44 89 f6 e8 1c ae cd fd 4c 89 74 24 10 44 39 f3 76 21 e8 6d ac cd fd 45 31 ed eb 6d e8 63 ac cd fd <0f> 0b 41 bf f9 ff ff ff 48 8b 5c 24 18 e9 41 01 00 00 e8 4c ac cd
RSP: 0018:ffffc90003c0f8c0 EFLAGS: 00010293
RAX: ffffffff83bcf389 RBX: 0000000000000012 RCX: ffff88802243ba80
RDX: 0000000000000000 RSI: 0000000000000012 RDI: 0000000000000013
RBP: ffffc90003c0f9d0 R08: ffffffff83bcf37f R09: ffffed100e7a15dd
R10: ffffed100e7a15dd R11: 1ffff1100e7a15dc R12: 1ffff1100ea34806
R13: ffff8880751a4000 R14: 1ffff1100ea34805 R15: 0000000000000013
FS:  0000555556210300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bda9265e90 CR3: 000000001d27a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 gfs2_inode_lookup+0xb66/0xd90 fs/gfs2/inode.c:173
 gfs2_lookup_by_inum+0x4d/0xe0 fs/gfs2/inode.c:241
 gfs2_get_dentry fs/gfs2/export.c:139 [inline]
 gfs2_fh_to_dentry+0x12d/0x1f0 fs/gfs2/export.c:162
 exportfs_decode_fh_raw+0x115/0x600 fs/exportfs/expfs.c:435
 exportfs_decode_fh+0x38/0x70 fs/exportfs/expfs.c:575
 do_handle_to_path fs/fhandle.c:152 [inline]
 handle_to_path fs/fhandle.c:207 [inline]
 do_handle_open+0x485/0x950 fs/fhandle.c:223
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f27f5ae1799
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd97d6fbf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f27f5ae1799
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 00007f27f5aa1030 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000124d6 R11: 0000000000000246 R12: 00007f27f5aa10c0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>


---
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