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Date:   Sat, 17 Jun 2023 01:28:03 -0700
Message-ID: <0000000000007faf0005fe4f14b9@google.com>
Subject: [syzbot] [ext4?] WARNING in ext4_file_write_iter
From:   syzbot <syzbot+5050ad0fb47527b1808a@syzkaller.appspotmail.com>
To:     adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        syzkaller-bugs@googlegroups.com, tytso@mit.edu
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Hello,

syzbot found the following issue on:

HEAD commit:    f7efed9f38f8 Add linux-next specific files for 20230616
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=144c7b07280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=60b1a32485a77c16
dashboard link: https://syzkaller.appspot.com/bug?extid=5050ad0fb47527b1808a
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.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/95bcbee03439/disk-f7efed9f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6fd295caa4de/vmlinux-f7efed9f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/69c038a34b5f/bzImage-f7efed9f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5050ad0fb47527b1808a@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 17447 at fs/ext4/file.c:611 ext4_dio_write_iter fs/ext4/file.c:611 [inline]
WARNING: CPU: 1 PID: 17447 at fs/ext4/file.c:611 ext4_file_write_iter+0x1470/0x1880 fs/ext4/file.c:720
Modules linked in:
CPU: 1 PID: 17447 Comm: syz-executor.2 Not tainted 6.4.0-rc6-next-20230616-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:ext4_dio_write_iter fs/ext4/file.c:611 [inline]
RIP: 0010:ext4_file_write_iter+0x1470/0x1880 fs/ext4/file.c:720
Code: 84 03 00 00 48 8b 04 24 31 ff 8b 40 20 89 c3 89 44 24 10 83 e3 08 89 de e8 bd 5e 5b ff 85 db 0f 85 d5 fc ff ff e8 90 62 5b ff <0f> 0b e9 c9 fc ff ff e8 84 62 5b ff 48 8b 4c 24 40 4c 89 fa 4c 89
RSP: 0018:ffffc9000bc5f9e8 EFLAGS: 00010216
RAX: 000000000003523a RBX: 0000000000000000 RCX: ffffc9000b3d9000
RDX: 0000000000040000 RSI: ffffffff8228ff90 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8a832160
R13: 0000000000000000 R14: 0000000000000000 R15: fffffffffffffff5
FS:  00007f129f62e700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020105000 CR3: 0000000044e0d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 call_write_iter include/linux/fs.h:1871 [inline]
 aio_write+0x350/0x7d0 fs/aio.c:1596
 __io_submit_one fs/aio.c:1968 [inline]
 io_submit_one+0xf4c/0x1c50 fs/aio.c:2015
 __do_sys_io_submit fs/aio.c:2074 [inline]
 __se_sys_io_submit fs/aio.c:2044 [inline]
 __x64_sys_io_submit+0x190/0x320 fs/aio.c:2044
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f129e88c389
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f129f62e168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007f129e9abf80 RCX: 00007f129e88c389
RDX: 0000000020000780 RSI: 0000000000000001 RDI: 00007f129f5e4000
RBP: 00007f129e8d7493 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffd72c552f R14: 00007f129f62e300 R15: 0000000000022000
 </TASK>


---
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