linux-kernel - [syzbot] [udf?] WARNING in udf

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Message-ID: <000000000000c31da505f0025531@google.com>
Date:   Sat, 17 Dec 2022 01:01:42 -0800
From:   syzbot <syzbot+0937935b993956ba28ab@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, jack@...e.com, jack@...e.cz,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [udf?] WARNING in udf_setsize

Hello,

syzbot found the following issue on:

HEAD commit:    764822972d64 Merge tag 'nfsd-6.2' of git://git.kernel.org/..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11536087880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c59170b68d26a55
dashboard link: https://syzkaller.appspot.com/bug?extid=0937935b993956ba28ab
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=11c41f07880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=137b3913880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0c840c19749d/disk-76482297.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/bdfd51618ae0/vmlinux-76482297.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fef17b5d4d6d/bzImage-76482297.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/f0caf90549db/mount_0.gz

The issue was bisected to:

commit 16d0556568148bdcaa45d077cac9f8f7077cf70a
Author: Jan Kara <jack@...e.cz>
Date:   Wed Dec 7 17:17:34 2022 +0000

    udf: Discard preallocation before extending file with a hole

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1790d4e7880000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1450d4e7880000
console output: https://syzkaller.appspot.com/x/log.txt?x=1050d4e7880000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0937935b993956ba28ab@...kaller.appspotmail.com
Fixes: 16d055656814 ("udf: Discard preallocation before extending file with a hole")

------------[ cut here ]------------
WARNING: CPU: 1 PID: 3631 at fs/udf/inode.c:639 udf_setsize+0xf9e/0x1380 fs/udf/inode.c:1236
Modules linked in:
CPU: 1 PID: 3631 Comm: syz-executor194 Not tainted 6.1.0-syzkaller-03225-g764822972d64 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:udf_extend_file fs/udf/inode.c:638 [inline]
RIP: 0010:udf_setsize+0xf9e/0x1380 fs/udf/inode.c:1236
Code: 8e fe 45 85 f6 49 bf 00 00 00 00 00 fc ff df 74 0a e8 86 28 8e fe e9 34 ff ff ff e8 7c 28 8e fe e9 fa fd ff ff e8 72 28 8e fe <0f> 0b e9 61 f6 ff ff 89 d9 80 e1 07 38 c1 0f 8c 1a f1 ff ff 48 89
RSP: 0018:ffffc90003cefb00 EFLAGS: 00010293
RAX: ffffffff82fd3d5e RBX: 0000000000000800 RCX: ffff888022760000
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000000000800
RBP: ffffc90003cefcd8 R08: ffffffff82fd33b8 R09: ffffed100df29024
R10: ffffed100df29024 R11: 1ffff1100df29023 R12: 1ffff9200079df70
R13: ffffc90003cefc10 R14: 0000000000001000 R15: 0000000000000009
FS:  00005555566c83c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560387521d28 CR3: 0000000073ea7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 udf_setattr+0x362/0x530 fs/udf/file.c:281
 notify_change+0xe50/0x1100 fs/attr.c:482
 do_truncate+0x200/0x2f0 fs/open.c:65
 do_sys_ftruncate+0x2bc/0x360 fs/open.c:193
 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: 0033:0x7fd454550da9
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:00007ffeb8edd258 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007ffeb8edd268 RCX: 00007fd454550da9
RDX: ffffffffffffffc0 RSI: 00000000000007fb RDI: 0000000000000004
RBP: 00007ffeb8edd260 R08: 00007fd45450e360 R09: 00007fd45450e360
R10: 00007ffeb8edd260 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches