[LU-5216] HSM: restore doesn't restart for new copytool

• Type: Bug
• Resolution: Unresolved
• Priority: Major
• Affects Version/s: Lustre 2.5.1
• Labels: patch
• Environment: Centos 6.5, Lustre 2.5.56
• Severity: 3
• Assignee: Jean-Baptiste Riaux (Inactive)
• Reporter: Frank Zago (Inactive)

Description

When a restoration doesn't complete properly by a copytool, it is not restarted, and processes get stuck in Lustre modules.

For instance, create a large file that takes a few seconds to archive/restore, then release it, and access it:

# dd if=/dev/urandom of=/mnt/lustre/bigf bs=1M count 1000
# lfs hsm_archive /mnt/lustre/bigf
# lfs hsm_release  /mnt/lustre/bigf
# sleep 5https://jira.hpdd.intel.com/browse/LU-5216#
# md5sum /mnt/lustre/bigf

During the restoration, kill the copytool, so no complete event is sent to the MDS.

Note that at this point, it is possible the copytool is unkillable, and the only fix is to reboot the client running that copytool.

When the copytool restarts, nothing happens. The process trying to read the file is stuck (apparently forever) there:

# cat /proc/1675/stack 
[<ffffffffa09dc04c>] ll_layout_refresh+0x25c/0xfe0 [lustre]
[<ffffffffa0a28240>] vvp_io_init+0x340/0x490 [lustre]
[<ffffffffa04dab68>] cl_io_init0+0x98/0x160 [obdclass]
[<ffffffffa04dd794>] cl_io_init+0x64/0xe0 [obdclass]
[<ffffffffa04debfd>] cl_io_rw_init+0x8d/0x200 [obdclass]
[<ffffffffa09cbe38>] ll_file_io_generic+0x208/0x710 [lustre]
[<ffffffffa09ccf8f>] ll_file_aio_read+0x13f/0x2c0 [lustre]
[<ffffffffa09cd27c>] ll_file_read+0x16c/0x2a0 [lustre]
[<ffffffff81189365>] vfs_read+0xb5/0x1a0
[<ffffffff811894a1>] sys_read+0x51/0x90
[<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff

It is also unkillable.

If I issue the "lfs hsm_restore bigf.bin", lfs gets stuck too:

# cat /proc/1723/stack 
[<ffffffffa06ad29a>] ptlrpc_set_wait+0x2da/0x860 [ptlrpc]
[<ffffffffa06ad8a7>] ptlrpc_queue_wait+0x87/0x220 [ptlrpc]
[<ffffffffa0868913>] mdc_iocontrol+0x2113/0x27f0 [mdc]
[<ffffffffa0af5265>] obd_iocontrol+0xe5/0x360 [lmv]
[<ffffffffa0b0c145>] lmv_iocontrol+0x1c85/0x2b10 [lmv]
[<ffffffffa09bb235>] obd_iocontrol+0xe5/0x360 [lustre]
[<ffffffffa09c64d7>] ll_dir_ioctl+0x4237/0x5dc0 [lustre]
[<ffffffff8119d802>] vfs_ioctl+0x22/0xa0
[<ffffffff8119d9a4>] do_vfs_ioctl+0x84/0x580
[<ffffffff8119df21>] sys_ioctl+0x81/0xa0
[<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff

However lfs hsm operation still works on other files.

Issue Links

• is blocking: LU-10175 DoM:Full support for the LDLM lock convert
• is related to: LU-11284 Full lock convert conflicts with HSM
• is related to: LU-8905 tests: sanity-hsm test_3[3-6] does not use ps correctly