[LU-12642] bad sequence output on OST

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0
• Severity: 3
• Assignee: Sergey Cheremencev
• Reporter: Sergey Cheremencev

Description

Bug was found in sanity_53:

PTLDEBUG=-1 SUBSYSTEM=-1 DEBUG_SIZE=1000 SANITY_EXCEPT="43" MDSCOUNT=4 OSTCOUNT=4 SLOW=yes ONLY=53 sh sanity.sh -v
...
== sanity test 53: verify that MDS and OSTs agree on pre-creation ==================================== 05:27:47 (1536139667)
lustre-OST0000.last_id=0x300000400:65; MDS.last_id=65
lustre-OST0000.last_id=0x300000401:65; MDS.last_id=65
lustre-OST0000.last_id=0x300000402:65; MDS.last_id=65
lustre-OST0000.last_id=0x100000000:65; MDS.last_id=65
lustre-OST0001.last_id=0x340000400:65; MDS.last_id=65
lustre-OST0001.last_id=0x340000401:65; MDS.last_id=65
lustre-OST0001.last_id=0x100010000:65; MDS.last_id=65
lustre-OST0002.last_id=0x380000400:65; MDS.last_id=65
lustre-OST0002.last_id=0x380000401:65; MDS.last_id=65
lustre-OST0002.last_id=0x380000402:65; MDS.last_id=65
lustre-OST0002.last_id=0x100020000:65; MDS.last_id=65
lustre-OST0003.last_id=0x3c0000400:65; MDS.last_id=4294967330
lustre-OST0003.last_id=0x3c0000401:65; MDS.last_id=4294967330
lustre-OST0003.last_id=0x3c0000402:65; MDS.last_id=4294967330
lustre-OST0003.last_id=0x100030001:4294967330; MDS.last_id=4294967330

to reproduce

1. umount /mnt/lustre-ost3
2. mount -t ldiskfs -o loop /tmp/lustre-ost3 /mnt/ost
3. cd /mnt/ost/O/0
4. hexedit LAST_ID (change it to ff ff ff ff 00 00 00 00)
5. umount /mnt/ost
6. mount -t lustre -o loop /tmp/lustre-ost3/ /mnt/lustre-ost3

[root@localhost ost3]# cat /proc/fs/lustre/obdfilter/lustre-OST0002/last_id 0x100020001:4295098401...
[root@localhost ost3]# cat /proc/fs/lustre/osp/lustre-OST0002-osc-MDT0000/prealloc_last_seq 0x100020000
[root@localhost ost3]# cat /proc/fs/lustre/osp/lustre-OST0002-osc-MDT0000/prealloc_last_id 4295098401