xfs: force shutdown xfs when xfs_attr_inactive fails

Offering: HULK
hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I72VMY



--------------------------------

I observed the following evidence of a leak while xfs_inactive failed.
Especially in Debug mode, when xfs_attr_inactive failed, current exception
path handling rudely clear inode attr fork, and if the inode is recycled
then assertion will accur, if not, which may also lead to memory leak.

Since xfs_attr_inactive is supposed to clean up the attribute fork when
the inode is being freed. While it removes the in-memory attribute fork
even in the event of truncate attribute fork extents failure, then some
attr data may left in memory and never be released. By avoiding blukstat
ioctl concurrent access this inode, force shutdown xfs when this
situation occurs.

The following script reliably replays the bug described above.
```
DISK=vdb
MP=/mnt/$DISK
DEV=/dev/$DISK
nfiles=10
xattr_val="this is xattr value."
while true
do
	pidof fsstress | xargs kill -9
	umount $MP
	df | grep $MP || break
	sleep 2
done

mkdir -p ${MP} && mkfs.xfs -f $DEV && mount $DEV $MP
echo 0 > /sys/fs/xfs/$DISK/errortag/bmapifmt

cd $MP; touch $(seq 1 $nfiles); cd $OLDPWD
for n in `seq 1 $nfiles`; do
	for j in `seq 1 20`; do
		setfattr -n user.${j} -v "$xattr_val" $MP/$n
	done
done
fsstress -d $MP -z -f bulkstat=200 -S c -l 1000 -p 8 &
/usr/bin/rm $MP/*
echo 3 > /sys/fs/xfs/$DISK/errortag/bmapifmt
```

Assertion in the kernel log as follows:

XFS (vdb): Mounting V5 Filesystem bd1b6c38-599a-43b3-8194-a584bebec4ca
XFS (vdb): Ending clean mount
xfs filesystem being mounted at /mnt/vdb supports timestamps until 2038 (0x7fffffff)
XFS (vdb): Injecting error (false) at file fs/xfs/libxfs/xfs_bmap.c, line 3887, on filesystem "vdb"
XFS: Assertion failed: ip->i_nblocks == 0, file: fs/xfs/xfs_inode.c, line: 2277
------------[ cut here ]------------
kernel BUG at fs/xfs/xfs_message.c:102!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 3 PID: 74 Comm: kworker/3:1 Not tainted 6.3.0-rc6-00127-g71deb8a5658c #569
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014
Workqueue: xfs-inodegc/vdb xfs_inodegc_worker
RIP: 0010:assfail+0x8c/0x90
Code: 80 3d 37 27 3b 0a 00 75 1c e8 a0 b0 20 ff 0f 0b 5b 5d 41 5c 41 5d c3
48 c7 c7 30 25 64 8c e8 fb d8 66 ff eb db e8 84 b0 20 ff <0f> 0b 66 90 0f
1f 44 00 00 55 48 89 fd 53 48 63 de e8 6e b0 20 ff
RSP: 0018:ffff888101b17b20 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffffff8444eea0 RCX: 0000000000000000
RDX: ffff888101b08040 RSI: ffffffff8228fe1c RDI: ffffffff844510c0
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff888101b177ff
R10: ffffed1020362eff R11: 0000000000000001 R12: ffffffff8444f720
R13: 00000000000008e5 R14: ffff888155279800 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8883edd80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001612e18 CR3: 000000017bab5005 CR4: 0000000000770ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 <TASK>
 xfs_ifree+0xea6/0x1310
 xfs_inactive_ifree.isra.0+0x1ab/0x460
 xfs_inactive+0x41f/0x710
 xfs_inodegc_worker+0x22e/0x500
 process_one_work+0x6d1/0xfe0
 worker_thread+0x5b9/0xf60
 kthread+0x287/0x330
 ret_from_fork+0x1f/0x30
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:assfail+0x8c/0x90
Code: 80 3d 37 27 3b 0a 00 75 1c e8 a0 b0 20 ff 0f 0b 5b 5d 41 5c 41 5d c3
48 c7 c7 30 25 64 8c e8 fb d8 66 ff eb db e8 84 b0 20 ff <0f> 0b 66 90 0f
1f 44 00 00 55 48 89 fd 53 48 63 de e8 6e b0 20 ff
RSP: 0018:ffff888101b17b20 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffffff8444eea0 RCX: 0000000000000000
RDX: ffff888101b08040 RSI: ffffffff8228fe1c RDI: ffffffff844510c0
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff888101b177ff
R10: ffffed1020362eff R11: 0000000000000001 R12: ffffffff8444f720
R13: 00000000000008e5 R14: ffff888155279800 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8883edd80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001612e18 CR3: 000000017bab5005 CR4: 0000000000770ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554

Fixes: 6dfe5a04 ("xfs: xfs_attr_inactive leaves inconsistent attr fork state behind")
Signed-off-by: Guo Xuenan <guoxuenan@huawei.com>
Signed-off-by: Long Li <leo.lilong@huawei.com>