[LU-2808] osp_object_assign_fid()) ASSERTION( fid_is_zero(lu_object_fid(&o->opo_obj.do_lu)) ) failed:

Duplicate — Wed, 23 Jun 2021 23:01:36 +0000

Racy reproducer:

# llmount.sh
# cd /mnt/lustre
# while true; do lfs setstripe -c 1 f0; rm f0; done &
[1] 3814
# while true; do truncate --size=1 f0; done
cannot truncate `f0' to length 21705: No such file or directory
cannot truncate `f0' to length 17399: No such file or directory
cannot truncate `f0' to length 18024: No such file or directory
cannot truncate `f0' to length 25593: No such file or directory
cannot truncate `f0' to length 19126: No such file or directory
cannot truncate `f0' to length 29680: No such file or directory
cannot truncate `f0' to length 14928: No such file or directory
cannot truncate `f0' to length 23877: No such file or directory
cannot truncate `f0' to length 6911: No such file or directory
cannot truncate `f0' to length 868: No such file or directory
cannot truncate `f0' to length 791: No such file or directory
cannot truncate `f0' to length 28593: No such file or directory
cannot truncate `f0' to length 7330: No such file or directory
cannot truncate `f0' to length 9708: No such file or directory

Message from syslogd@m at Feb 13 10:29:39 ...
 kernel:LustreError: 3088:0:(osp_object.c:56:osp_object_assign_fid()) ASSERTION( fid_is_zero(lu_object_fid(&o->opo_obj.do_lu)) ) failed:

Message from syslogd@m at Feb 13 10:29:39 ...
 kernel:LustreError: 3088:0:(osp_object.c:56:osp_object_assign_fid()) LBUG

Message from syslogd@m at Feb 13 10:29:39 ...
 kernel:Kernel panic - not syncing: LBUG

crash> bt
PID: 31940  TASK: ffff8801663b5500  CPU: 0   COMMAND: "mdt00_001"
 #0 [ffff8801663b78e8] machine_kexec at ffffffff81031f7b
 #1 [ffff8801663b7948] crash_kexec at ffffffff810b8c22
 #2 [ffff8801663b7a18] panic at ffffffff814eae18
 #3 [ffff8801663b7a98] lbug_with_loc at ffffffffa0ef3eeb [libcfs]
 #4 [ffff8801663b7ab8] osp_object_assign_fid at ffffffffa0b98942 [osp]
 #5 [ffff8801663b7ae8] osp_declare_attr_set at ffffffffa0b98b11 [osp]
 #6 [ffff8801663b7b38] lod_declare_attr_set at ffffffffa0b68083 [lod]
 #7 [ffff8801663b7b88] mdd_attr_set at ffffffffa051f5e9 [mdd]
 #8 [ffff8801663b7c08] mdt_attr_set at ffffffffa0a4deb8 [mdt]
 #9 [ffff8801663b7c58] mdt_reint_setattr at ffffffffa0a4e7ad [mdt]
#10 [ffff8801663b7cc8] mdt_reint_rec at ffffffffa0a486b1 [mdt]
#11 [ffff8801663b7ce8] mdt_reint_internal at ffffffffa0a41d13 [mdt]
#12 [ffff8801663b7d28] mdt_reint at ffffffffa0a42044 [mdt]
#13 [ffff8801663b7d48] mdt_handle_common at ffffffffa0a32fb8 [mdt]
#14 [ffff8801663b7d98] mds_regular_handle at ffffffffa0a6a5c5 [mdt]
#15 [ffff8801663b7da8] ptlrpc_server_handle_request at ffffffffa062c00c [ptlrpc]
#16 [ffff8801663b7ea8] ptlrpc_main at ffffffffa062d556 [ptlrpc]
#17 [ffff8801663b7f48] kernel_thread at ffffffff8100c0ca

A deterministic reproducer is attached. It does

fd1 = open("f0", O_RDWR|O_CREAT|O_LOV_DELAY_CREATE, 0666);
fd2 = open("f0", O_RDWR|O_CREAT, 0666);
ftruncate(fd2, 1);

This seems to be independent from ~~LU-2523~~. I tried this with and without the patch from ~~LU-2523~~ and got the same result.

Note that in the call to ftruncate() if fd1 is used instead of fd2 or if a zero length is used then there is no LBUG. If truncate("f0", 1) is used then there is also no LBUG.

Interestingly, if MOUNT_2=yes is used and the first open is of "/mnt/lustre/f0" and the second of "/mnt/lustre2/f0" then there is no LBUG. However while the setstripe ioctl() will appear to succeed, in fact the default striping will be applied to the file.

Whamcloud Community JIRA

[LU-2808] osp_object_assign_fid()) ASSERTION( fid_is_zero(lu_object_fid(&o->opo_obj.do_lu)) ) failed: