[LU-981] lustre client crash when accessing a lustre file mounted as loopback Created: 11/Jan/12  Updated: 02/May/12  Resolved: 16/Mar/12

Status: Resolved
Project: Lustre
Component/s: None
Affects Version/s: Lustre 2.1.0
Fix Version/s: Lustre 2.3.0

Type: Bug Priority: Major
Reporter: Gabriel Assignee: Jinshan Xiong (Inactive)
Resolution: Fixed Votes: 0
Labels: None
Environment:

Ubuntu 10.04 LTS
Kernel 2.6.32-131.6.1-lustre-2.1.0

Severity: 3
Epic: client
Rank (Obsolete): 4686

 Description   

To increase performance using small files, as several lustre guides recommend, we created a "big" file to use it mounted as loopback. When you write some data the client stops and the whole computer hangs.

    • It works using version 1.8.5!!!

Example:

dd if=/dev/zero of=/lustre21/my_fs_personal.iso bs=8192 count=9999
mkfs.ext4 /lustre21/my_fs_personal.iso

mount -t ext4 -o loop /lustre21/mi_fs_personal.iso /mnt

dd if=/dev/zero of=/mnt/example_file.dat bs=8192 count=8999

 Comments   
Comment by Oleg Drokin [ 16/Jan/12 ]

do you get kernel BUG in submit_bh?

Comment by Gabriel [ 17/Jan/12 ]

Hello,

After writing on the file, the client "hangs". This is the onycoredump left in the log/console screen:

Best regards,

Gabriel

kernel:last sysfs file: /sys/devices/virtual/block/loop0/uevent
Jan 17 11:59:37 larcaserver3 kernel: CPU 1
Jan 17 11:59:37 larcaserver3 kernel: Modules linked in: ext2 lmv(U) mgc(U) lustre(U) lov(U) osc(U) lquota(U) mdc(U) fid(U) fld(U) ksocklnd(U) ptlrpc(U) obdclass(U) lnet(U) lvfs(U) libcfs(U) ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE xt_state ipt_REJECT iptable_filter iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables ipv6 kvm_intel kvm fuse bridge 8021q garp stp llc dm_snapshot dm_round_robin dm_multipath snd_pcsp snd_pcm snd_timer ghes snd power_meter hed hwmon soundcore dcdbas snd_page_alloc ext4 mbcache jbd2 dm_mod raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx sd_mod crc_t10dif sg sr_mod cdrom ata_generic mptsas mptscsih mptbase pata_acpi ata_piix scsi_transport_sas bnx2 igb dca [last unloaded: scsi_wait_scan]
Jan 17 11:59:37 larcaserver3 kernel:
Jan 17 11:59:37 larcaserver3 kernel: Modules linked in: ext2 lmv(U) mgc(U) lustre(U) lov(U) osc(U) lquota(U) mdc(U) fid(U) fld(U) ksocklnd(U) ptlrpc(U) obdclass(U) lnet(U) lvfs(U) libcfs(U) ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE xt_state ipt_REJECT iptable_filter iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables ipv6 kvm_intel kvm fuse bridge 8021q garp stp llc dm_snapshot dm_round_robin dm_multipath snd_pcsp snd_pcm snd_timer ghes snd power_meter hed hwmon soundcore dcdbas snd_page_alloc ext4 mbcache jbd2 dm_mod raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx sd_mod crc_t10dif sg sr_mod cdrom ata_generic mptsas mptscsih mptbase pata_acpi ata_piix scsi_transport_sas bnx2 igb dca [last unloaded: scsi_wait_scan]
Jan 17 11:59:37 larcaserver3 kernel: Pid: 3597, comm: loop0 Not tainted 2.6.32-131.6.1-lustre-2.1.0 #1 PowerEdge R310
Jan 17 11:59:37 larcaserver3 kernel: RIP: 0010:[<ffffffffa08994de>] [<ffffffffa08994de>] vvp_io_rw_lock+0x10e/0x630 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: RSP: 0018:ffff88021d26d9a0 EFLAGS: 00010246
Jan 17 11:59:37 larcaserver3 kernel: RAX: 0000000000000000 RBX: ffff88023463ae00 RCX: 0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: RDX: ffff880224a2e140 RSI: ffffffffa08af960 RDI: ffff880225def188
Jan 17 11:59:37 larcaserver3 kernel: RBP: ffff88021d26da70 R08: 0000000000000fff R09: 0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: R10: 0000000000000000 R11: ffff880233ed9cb0 R12: ffff880225def148
Jan 17 11:59:37 larcaserver3 kernel: R13: ffff880225def148 R14: ffff880224a2e140 R15: ffff88021ea06ee8
Jan 17 11:59:37 larcaserver3 kernel: FS: 0000000000000000(0000) GS:ffff88002f620000(0000) knlGS:0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
Jan 17 11:59:37 larcaserver3 kernel: CR2: 0000000000000000 CR3: 00000002260d6000 CR4: 00000000000006e0
Jan 17 11:59:37 larcaserver3 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Jan 17 11:59:37 larcaserver3 kernel: Process loop0 (pid: 3597, threadinfo ffff88021d26c000, task ffff880232e04040)
Jan 17 11:59:37 larcaserver3 kernel: Stack:

Message from syslogd@larcaserver3 at Jan 17 11:59:37 ...
kernel:Stack:
Jan 17 11:59:37 larcaserver3 kernel: ffff88021d26da30 0000000000000000 ffff88021d26da30 ffff8802260c3eb0
Jan 17 11:59:37 larcaserver3 kernel: <0> ffff88023569cf30 ffff880225def148 ffff88022b1de3c0 0000000000000fff
Jan 17 11:59:37 larcaserver3 kernel: <0> 0000000000000000 0000000000000002 ffff880224a2e140 0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: Call Trace:

Message from syslogd@larcaserver3 at Jan 17 11:59:37 ...
kernel:Call Trace:
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa07fc47b>] ? lov_io_rw_iter_init+0x18b/0x350 [lov]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa0899a35>] vvp_io_write_lock+0x35/0x40 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d4173>] cl_io_lock+0x63/0x5f0 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d070d>] ? cl_io_iter_init+0x5d/0x140 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03b19ae>] ? cfs_free+0xe/0x10 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa07fa3b3>] ? lov_io_fini+0x253/0x3d0 [lov]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa086e86f>] ll_cl_init+0x37f/0x4e0 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03c0972>] ? cfs_hash_rw_lock+0x12/0x30 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03bfb1d>] ? cfs_hash_multi_bd_lock+0x6d/0xc0 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa086ec13>] ll_prepare_write+0x53/0x1d0 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8110e73a>] ? grab_cache_page_write_begin+0x4a/0xc0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa0886603>] ll_write_begin+0x83/0x200 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff81103f96>] ? __perf_event_task_sched_out+0x36/0x50
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8110c88c>] pagecache_write_begin+0x1c/0x20
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134ab85>] do_lo_send_aops+0x155/0x1a0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8106068b>] ? dequeue_task_fair+0x8b/0x90
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134ada6>] do_bio_filebacked+0x1d6/0x2b0

Message from syslogd@larcaserver3 at Jan 17 11:59:37 ...
kernel:Code: a9 02 00 00 48 8b 45 80 48 c7 45 88 00 00 00 00 48 83 78 78 00 0f 84 c4 01 00 00 48 8b 45 88 48 8b 55 80 48 c1 e0 04 48 03 42 70 <4c> 8b 28 48 8b 40 08 48 85 c0 0f 84 8d 01 00 00 4d 89 ee 49 81

Message from syslogd@larcaserver3 at Jan 17 11:59:37 ...
kernel:CR2: 0000000000000000

Message from syslogd@larcaserver3 at Jan 17 11:59:37 ...
kernel:Kernel panic - not syncing: Fatal exception
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134aa30>] ? do_lo_send_aops+0x0/0x1a0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134af51>] loop_thread+0xd1/0x270
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8108e2d0>] ? autoremove_wake_function+0x0/0x40
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134ae80>] ? loop_thread+0x0/0x270
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8108df66>] kthread+0x96/0xa0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8100c18a>] child_rip+0xa/0x20
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8108ded0>] ? kthread+0x0/0xa0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8100c180>] ? child_rip+0x0/0x20
Jan 17 11:59:37 larcaserver3 kernel: Code: a9 02 00 00 48 8b 45 80 48 c7 45 88 00 00 00 00 48 83 78 78 00 0f 84 c4 01 00 00 48 8b 45 88 48 8b 55 80 48 c1 e0 04 48 03 42 70 <4c> 8b 28 48 8b 40 08 48 85 c0 0f 84 8d 01 00 00 4d 89 ee 49 81
Jan 17 11:59:37 larcaserver3 kernel: RIP [<ffffffffa08994de>] vvp_io_rw_lock+0x10e/0x630 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: RSP <ffff88021d26d9a0>
Jan 17 11:59:37 larcaserver3 kernel: CR2: 0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: --[ end trace e76e994e0eb746b2 ]--
Jan 17 11:59:37 larcaserver3 kernel: Kernel panic - not syncing: Fatal exception
Jan 17 11:59:37 larcaserver3 kernel: Pid: 3597, comm: loop0 Tainted: G D ---------------- 2.6.32-131.6.1-lustre-2.1.0 #1
Jan 17 11:59:37 larcaserver3 kernel: Call Trace:
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff814dccbd>] ? panic+0x78/0x143
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff814e0d74>] ? oops_end+0xe4/0x100
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff81040cab>] ? no_context+0xfb/0x260
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa056a045>] ? ldlm_lock_decref_internal+0x305/0x7c0 [ptlrpc]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff81040f35>] ? __bad_area_nosemaphore+0x125/0x1e0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03c0497>] ? cfs_hash_bd_lookup_intent+0x37/0x130 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff81041003>] ? bad_area_nosemaphore+0x13/0x20
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff810416dd>] ? __do_page_fault+0x31d/0x490
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d1181>] ? cl_io_slice_add+0x71/0x160 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa079ae20>] ? osc_io_init+0xa0/0x120 [osc]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d0890>] ? cl_io_init0+0xa0/0x1a0 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03c2d9d>] ? cfs_hash_find_or_add+0x9d/0x1a0 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff814e2d9e>] ? do_page_fault+0x3e/0xa0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff814e00d5>] ? page_fault+0x25/0x30
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa08994de>] ? vvp_io_rw_lock+0x10e/0x630 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa07fc47b>] ? lov_io_rw_iter_init+0x18b/0x350 [lov]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa0899a35>] ? vvp_io_write_lock+0x35/0x40 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d4173>] ? cl_io_lock+0x63/0x5f0 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d070d>] ? cl_io_iter_init+0x5d/0x140 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03b19ae>] ? cfs_free+0xe/0x10 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa07fa3b3>] ? lov_io_fini+0x253/0x3d0 [lov]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa086e86f>] ? ll_cl_init+0x37f/0x4e0 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03c0972>] ? cfs_hash_rw_lock+0x12/0x30 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03bfb1d>] ? cfs_hash_multi_bd_lock+0x6d/0xc0 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa086ec13>] ? ll_prepare_write+0x53/0x1d0 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8110e73a>] ? grab_cache_page_write_begin+0x4a/0xc0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa0886603>] ? ll_write_begin+0x83/0x200 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff81103f96>] ? __perf_event_task_sched_out+0x36/0x50
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8110c88c>] ? pagecache_write_begin+0x1c/0x20
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134ab85>] ? do_lo_send_aops+0x155/0x1a0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8106068b>] ? dequeue_task_fair+0x8b/0x90

Comment by Gabriel [ 17/Jan/12 ]

Hello,

After writing on the mounting file, system crash. This is the coredump
left on the console/log files of the client.

best regards,

Gabriel

Hello,

After writing on the file, the client "hangs". This is the onycoredump
left in the log/console screen:

Best regards,

Gabriel

kernel:last sysfs file: /sys/devices/virtual/block/loop0/uevent
Jan 17 11:59:37 larcaserver3 kernel: CPU 1
Jan 17 11:59:37 larcaserver3 kernel: Modules linked in: ext2 lmv(U)
mgc(U) lustre(U) lov(U) osc(U) lquota(U) mdc(U) fid(U) fld(U)
ksocklnd(U) ptlrpc(U) obdclass(U) lnet(U) lvfs(U) libcfs(U)
ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE xt_state
ipt_REJECT iptable_filter iptable_nat nf_nat nf_conntrack_ipv4
nf_conntrack nf_defrag_ipv4 ip_tables ipv6 kvm_intel kvm fuse bridge
8021q garp stp llc dm_snapshot dm_round_robin dm_multipath snd_pcsp
snd_pcm snd_timer ghes snd power_meter hed hwmon soundcore dcdbas
snd_page_alloc ext4 mbcache jbd2 dm_mod raid456 async_raid6_recov
async_pq raid6_pq async_xor xor async_memcpy async_tx sd_mod crc_t10dif
sg sr_mod cdrom ata_generic mptsas mptscsih mptbase pata_acpi ata_piix
scsi_transport_sas bnx2 igb dca [last unloaded: scsi_wait_scan]
Jan 17 11:59:37 larcaserver3 kernel:
Jan 17 11:59:37 larcaserver3 kernel: Modules linked in: ext2 lmv(U)
mgc(U) lustre(U) lov(U) osc(U) lquota(U) mdc(U) fid(U) fld(U)
ksocklnd(U) ptlrpc(U) obdclass(U) lnet(U) lvfs(U) libcfs(U)
ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE xt_state
ipt_REJECT iptable_filter iptable_nat nf_nat nf_conntrack_ipv4
nf_conntrack nf_defrag_ipv4 ip_tables ipv6 kvm_intel kvm fuse bridge
8021q garp stp llc dm_snapshot dm_round_robin dm_multipath snd_pcsp
snd_pcm snd_timer ghes snd power_meter hed hwmon soundcore dcdbas
snd_page_alloc ext4 mbcache jbd2 dm_mod raid456 async_raid6_recov
async_pq raid6_pq async_xor xor async_memcpy async_tx sd_mod crc_t10dif
sg sr_mod cdrom ata_generic mptsas mptscsih mptbase pata_acpi ata_piix
scsi_transport_sas bnx2 igb dca [last unloaded: scsi_wait_scan]
Jan 17 11:59:37 larcaserver3 kernel: Pid: 3597, comm: loop0 Not tainted
2.6.32-131.6.1-lustre-2.1.0 #1 PowerEdge R310
Jan 17 11:59:37 larcaserver3 kernel: RIP: 0010:[<ffffffffa08994de>]
[<ffffffffa08994de>] vvp_io_rw_lock+0x10e/0x630 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: RSP: 0018:ffff88021d26d9a0 EFLAGS:
00010246
Jan 17 11:59:37 larcaserver3 kernel: RAX: 0000000000000000 RBX:
ffff88023463ae00 RCX: 0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: RDX: ffff880224a2e140 RSI:
ffffffffa08af960 RDI: ffff880225def188
Jan 17 11:59:37 larcaserver3 kernel: RBP: ffff88021d26da70 R08:
0000000000000fff R09: 0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: R10: 0000000000000000 R11:
ffff880233ed9cb0 R12: ffff880225def148
Jan 17 11:59:37 larcaserver3 kernel: R13: ffff880225def148 R14:
ffff880224a2e140 R15: ffff88021ea06ee8
Jan 17 11:59:37 larcaserver3 kernel: FS: 0000000000000000(0000)
GS:ffff88002f620000(0000) knlGS:0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: CS: 0010 DS: 0018 ES: 0018 CR0:
000000008005003b
Jan 17 11:59:37 larcaserver3 kernel: CR2: 0000000000000000 CR3:
00000002260d6000 CR4: 00000000000006e0
Jan 17 11:59:37 larcaserver3 kernel: DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
Jan 17 11:59:37 larcaserver3 kernel: Process loop0 (pid: 3597,
threadinfo ffff88021d26c000, task ffff880232e04040)
Jan 17 11:59:37 larcaserver3 kernel: Stack:

Message from syslogd@larcaserver3 at Jan 17 11:59:37 ...
kernel:Stack:
Jan 17 11:59:37 larcaserver3 kernel: ffff88021d26da30 0000000000000000
ffff88021d26da30 ffff8802260c3eb0
Jan 17 11:59:37 larcaserver3 kernel: <0> ffff88023569cf30
ffff880225def148 ffff88022b1de3c0 0000000000000fff
Jan 17 11:59:37 larcaserver3 kernel: <0> 0000000000000000
0000000000000002 ffff880224a2e140 0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: Call Trace:

Message from syslogd@larcaserver3 at Jan 17 11:59:37 ...
kernel:Call Trace:
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa07fc47b>] ?
lov_io_rw_iter_init+0x18b/0x350 [lov]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa0899a35>]
vvp_io_write_lock+0x35/0x40 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d4173>]
cl_io_lock+0x63/0x5f0 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d070d>] ?
cl_io_iter_init+0x5d/0x140 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03b19ae>] ?
cfs_free+0xe/0x10 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa07fa3b3>] ?
lov_io_fini+0x253/0x3d0 [lov]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa086e86f>]
ll_cl_init+0x37f/0x4e0 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03c0972>] ?
cfs_hash_rw_lock+0x12/0x30 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03bfb1d>] ?
cfs_hash_multi_bd_lock+0x6d/0xc0 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa086ec13>]
ll_prepare_write+0x53/0x1d0 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8110e73a>] ?
grab_cache_page_write_begin+0x4a/0xc0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa0886603>]
ll_write_begin+0x83/0x200 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff81103f96>] ?
__perf_event_task_sched_out+0x36/0x50
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8110c88c>]
pagecache_write_begin+0x1c/0x20
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134ab85>]
do_lo_send_aops+0x155/0x1a0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8106068b>] ?
dequeue_task_fair+0x8b/0x90
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134ada6>]
do_bio_filebacked+0x1d6/0x2b0

Message from syslogd@larcaserver3 at Jan 17 11:59:37 ...
kernel:Code: a9 02 00 00 48 8b 45 80 48 c7 45 88 00 00 00 00 48 83 78
78 00 0f 84 c4 01 00 00 48 8b 45 88 48 8b 55 80 48 c1 e0 04 48 03 42 70
<4c> 8b 28 48 8b 40 08 48 85 c0 0f 84 8d 01 00 00 4d 89 ee 49 81

Message from syslogd@larcaserver3 at Jan 17 11:59:37 ...
kernel:CR2: 0000000000000000

Message from syslogd@larcaserver3 at Jan 17 11:59:37 ...
kernel:Kernel panic - not syncing: Fatal exception
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134aa30>] ?
do_lo_send_aops+0x0/0x1a0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134af51>]
loop_thread+0xd1/0x270
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8108e2d0>] ?
autoremove_wake_function+0x0/0x40
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134ae80>] ?
loop_thread+0x0/0x270
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8108df66>] kthread+0x96/0xa0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8100c18a>] child_rip+0xa/0x20
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8108ded0>] ? kthread+0x0/0xa0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8100c180>] ?
child_rip+0x0/0x20
Jan 17 11:59:37 larcaserver3 kernel: Code: a9 02 00 00 48 8b 45 80 48 c7
45 88 00 00 00 00 48 83 78 78 00 0f 84 c4 01 00 00 48 8b 45 88 48 8b 55
80 48 c1 e0 04 48 03 42 70 <4c> 8b 28 48 8b 40 08 48 85 c0 0f 84 8d 01
00 00 4d 89 ee 49 81
Jan 17 11:59:37 larcaserver3 kernel: RIP [<ffffffffa08994de>]
vvp_io_rw_lock+0x10e/0x630 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: RSP <ffff88021d26d9a0>
Jan 17 11:59:37 larcaserver3 kernel: CR2: 0000000000000000
Jan 17 11:59:37 larcaserver3 kernel: --[ end trace e76e994e0eb746b2 ]--
Jan 17 11:59:37 larcaserver3 kernel: Kernel panic - not syncing: Fatal
exception
Jan 17 11:59:37 larcaserver3 kernel: Pid: 3597, comm: loop0 Tainted:
G D ---------------- 2.6.32-131.6.1-lustre-2.1.0 #1
Jan 17 11:59:37 larcaserver3 kernel: Call Trace:
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff814dccbd>] ? panic+0x78/0x143
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff814e0d74>] ?
oops_end+0xe4/0x100
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff81040cab>] ?
no_context+0xfb/0x260
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa056a045>] ?
ldlm_lock_decref_internal+0x305/0x7c0 [ptlrpc]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff81040f35>] ?
__bad_area_nosemaphore+0x125/0x1e0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03c0497>] ?
cfs_hash_bd_lookup_intent+0x37/0x130 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff81041003>] ?
bad_area_nosemaphore+0x13/0x20
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff810416dd>] ?
__do_page_fault+0x31d/0x490
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d1181>] ?
cl_io_slice_add+0x71/0x160 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa079ae20>] ?
osc_io_init+0xa0/0x120 [osc]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d0890>] ?
cl_io_init0+0xa0/0x1a0 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03c2d9d>] ?
cfs_hash_find_or_add+0x9d/0x1a0 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff814e2d9e>] ?
do_page_fault+0x3e/0xa0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff814e00d5>] ?
page_fault+0x25/0x30
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa08994de>] ?
vvp_io_rw_lock+0x10e/0x630 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa07fc47b>] ?
lov_io_rw_iter_init+0x18b/0x350 [lov]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa0899a35>] ?
vvp_io_write_lock+0x35/0x40 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d4173>] ?
cl_io_lock+0x63/0x5f0 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa04d070d>] ?
cl_io_iter_init+0x5d/0x140 [obdclass]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03b19ae>] ?
cfs_free+0xe/0x10 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa07fa3b3>] ?
lov_io_fini+0x253/0x3d0 [lov]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa086e86f>] ?
ll_cl_init+0x37f/0x4e0 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03c0972>] ?
cfs_hash_rw_lock+0x12/0x30 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa03bfb1d>] ?
cfs_hash_multi_bd_lock+0x6d/0xc0 [libcfs]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa086ec13>] ?
ll_prepare_write+0x53/0x1d0 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8110e73a>] ?
grab_cache_page_write_begin+0x4a/0xc0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffffa0886603>] ?
ll_write_begin+0x83/0x200 [lustre]
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff81103f96>] ?
__perf_event_task_sched_out+0x36/0x50
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8110c88c>] ?
pagecache_write_begin+0x1c/0x20
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8134ab85>] ?
do_lo_send_aops+0x155/0x1a0
Jan 17 11:59:37 larcaserver3 kernel: [<ffffffff8106068b>] ?
dequeue_task_fair+0x8b/0x90

–
RDlab (Campus Nord - UPC) – http://rdlab.lsi.upc.edu
C/ Jordi Girona 1-3. Edifici Omega, Despatx 005
08034 Barcelona

Telèfon: +34 93 413 78 20

Comment by Oleg Drokin [ 24/Jan/12 ]

Jinshan, please take a look at this, seems to be clio related.

Comment by Jinshan Xiong (Inactive) [ 25/Jan/12 ]

Please try patch: http://review.whamcloud.com/#change,2010

I'd like to suggest a new way for you guys to use loop device:
1. insmod llite_lloop.ko
2. lctl blockdev_attach <lustre-file> <loop-device-node>
3. mkfs.ext4 <loop-device-node>

This should have better performance and use less memory on the client side.

Comment by Gabriel [ 25/Jan/12 ]

Hello,

Thank you, we will check this patch and tell you what happended.

If it works, will be included in 2.1.1?

Best regards,

Gabriel

–
RDlab (Campus Nord - UPC) – http://rdlab.lsi.upc.edu
C/ Jordi Girona 1-3. Edifici Omega, Despatx 005
08034 Barcelona

Telèfon: +34 93 413 78 20

Comment by Jinshan Xiong (Inactive) [ 26/Jan/12 ]

yes, I think so.

Comment by Gabriel [ 27/Jan/12 ]

Hello,

First of all, than you for your support

a) Using lctl blockdev_attach <lustre-file> <loop-device-node> instead
of mount works perfect under lustre 2.1.0

b) About your patch:

  • We tested against the source from

http://downloads.whamcloud.com/public/lustre/lustre-2.1.0/el6/client/x86_64/

But we cannot compile it because it fails:

/home/XXXXXX/lustre_client/usr/src/lustre-2.1.0/lustre/llite/lloop.c:754:
error: implicit declaration of function ‘blkdev_get_by_dev’

If we apply ourselves directly the changes into the source code (without
using patch) compiles and it works.

Works perfect!

After using this patch into the source code, works using ctl
blockdev_attach and using mount -o loop!!!!

Thank you.

Best Regards,

Gabriel

–
RDlab (Campus Nord - UPC) – http://rdlab.lsi.upc.edu
C/ Jordi Girona 1-3. Edifici Omega, Despatx 005
08034 Barcelona

Telèfon: +34 93 413 78 20

Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » x86_64,server,el5,ofa #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » x86_64,server,el6,ofa #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » x86_64,client,el6,ofa #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » i686,server,el6,inkernel #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » i686,client,el6,inkernel #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » x86_64,client,el5,inkernel #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » x86_64,server,el6,inkernel #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » i686,client,el5,ofa #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » x86_64,client,el6,inkernel #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » i686,server,el6,ofa #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » i686,client,el6,ofa #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » x86_64,client,sles11,inkernel #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » x86_64,client,el5,ofa #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » i686,server,el5,ofa #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » x86_64,client,ubuntu1004,inkernel #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » x86_64,server,el5,inkernel #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Peter Jones [ 16/Mar/12 ]

Landed for 2.3

Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » i686,client,el5,inkernel #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 16/Mar/12 ]

Integrated in lustre-master » i686,server,el5,inkernel #521
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 03/Apr/12 ]

Integrated in lustre-dev » i686,server,el5,inkernel #310
LU-981 llite: fix loop back device writeback (Revision a5589d4d09df0cbc545714f1a0b97851aef95cc7)

Result = SUCCESS
tappro : a5589d4d09df0cbc545714f1a0b97851aef95cc7
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 03/Apr/12 ]

Integrated in lustre-dev » x86_64,server,el5,inkernel #310
LU-981 llite: fix loop back device writeback (Revision a5589d4d09df0cbc545714f1a0b97851aef95cc7)

Result = SUCCESS
tappro : a5589d4d09df0cbc545714f1a0b97851aef95cc7
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 03/Apr/12 ]

Integrated in lustre-dev » i686,client,el5,inkernel #310
LU-981 llite: fix loop back device writeback (Revision a5589d4d09df0cbc545714f1a0b97851aef95cc7)

Result = SUCCESS
tappro : a5589d4d09df0cbc545714f1a0b97851aef95cc7
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 03/Apr/12 ]

Integrated in lustre-dev » x86_64,client,el5,inkernel #310
LU-981 llite: fix loop back device writeback (Revision a5589d4d09df0cbc545714f1a0b97851aef95cc7)

Result = SUCCESS
tappro : a5589d4d09df0cbc545714f1a0b97851aef95cc7
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 03/Apr/12 ]

Integrated in lustre-dev » i686,client,el6,inkernel #310
LU-981 llite: fix loop back device writeback (Revision a5589d4d09df0cbc545714f1a0b97851aef95cc7)

Result = SUCCESS
tappro : a5589d4d09df0cbc545714f1a0b97851aef95cc7
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 03/Apr/12 ]

Integrated in lustre-dev » x86_64,server,el6,inkernel #310
LU-981 llite: fix loop back device writeback (Revision a5589d4d09df0cbc545714f1a0b97851aef95cc7)

Result = SUCCESS
tappro : a5589d4d09df0cbc545714f1a0b97851aef95cc7
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 03/Apr/12 ]

Integrated in lustre-dev » x86_64,client,el6,inkernel #310
LU-981 llite: fix loop back device writeback (Revision a5589d4d09df0cbc545714f1a0b97851aef95cc7)

Result = SUCCESS
tappro : a5589d4d09df0cbc545714f1a0b97851aef95cc7
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 02/May/12 ]

Integrated in lustre-dev » x86_64,client,el5,inkernel #340
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 02/May/12 ]

Integrated in lustre-dev » i686,client,el6,inkernel #340
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 02/May/12 ]

Integrated in lustre-dev » i686,server,el5,inkernel #340
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 02/May/12 ]

Integrated in lustre-dev » x86_64,server,el6,inkernel #340
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 02/May/12 ]

Integrated in lustre-dev » i686,client,el5,inkernel #340
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
Comment by Build Master (Inactive) [ 02/May/12 ]

Integrated in lustre-dev » x86_64,server,el5,inkernel #340
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/vvp_io.c
  • lustre/llite/lloop.c
Comment by Build Master (Inactive) [ 02/May/12 ]

Integrated in lustre-dev » x86_64,client,el6,inkernel #340
LU-981 llite: fix loop back device writeback (Revision 56e56ed49fc5392048872e4b9502a4ea66be2d90)

Result = SUCCESS
Oleg Drokin : 56e56ed49fc5392048872e4b9502a4ea66be2d90
Files :

  • lustre/llite/lloop.c
  • lustre/llite/vvp_io.c
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