Re: [syzbot] kernel panic: stack is corrupted in writeback_single_inode

From: syzbot <syzbot+84b7b87a6430a152c1f4@syzkaller.appspotmail.com>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
Subject: Re: [syzbot] kernel panic: stack is corrupted in writeback_single_inode
Date: Thu, 29 Sep 2022 13:25:36 -0700	[thread overview]
Message-ID: <0000000000000f962805e9d6ae62@google.com> (raw)
In-Reply-To: <0000000000008ea2da05e979435f@google.com>

syzbot has found a reproducer for the following issue on:

HEAD commit:    c3e0e1e23c70 Merge tag 'irq_urgent_for_v6.0' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17ab519c880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ba0d23aa7e1ffaf5
dashboard link: https://syzkaller.appspot.com/bug?extid=84b7b87a6430a152c1f4
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=157c2000880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=105224b8880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e7f1f925f94e/disk-c3e0e1e2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/830dabeedf0d/vmlinux-c3e0e1e2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+84b7b87a6430a152c1f4@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 8226
Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: writeback_single_inode+0x8e7/0x8f0
CPU: 0 PID: 10213 Comm: syz-executor262 Not tainted 6.0.0-rc7-syzkaller-00081-gc3e0e1e23c70 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 panic+0x2d6/0x715 kernel/panic.c:274
 __stack_chk_fail+0x12/0x20 kernel/panic.c:706
 writeback_single_inode+0x8e7/0x8f0
 write_inode_now+0x1cd/0x260 fs/fs-writeback.c:2723
 iput_final fs/inode.c:1735 [inline]
 iput+0x3e6/0x760 fs/inode.c:1774
 ntfs_fill_super+0x3af3/0x42a0 fs/ntfs3/super.c:1190
 get_tree_bdev+0x400/0x620 fs/super.c:1323
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
 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: 0033:0x7f5a7dd5549a
Code: 48 c7 c2 c0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 98 03 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007ffedfc06378 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5a7dd5549a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffedfc06390
RBP: 00007ffedfc06390 R08: 00007ffedfc063d0 R09: 00005555563ee2c0
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000004
R13: 00007ffedfc063d0 R14: 0000000000000015 R15: 0000000020000db8
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..