https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-2818 Lustre <p>This issue was created by maloo for sarah &lt;sarah@whamcloud.com&gt;</p> <p>This issue relates to the following test suite run: <a href="https://maloo.whamcloud.com/test_sets/25d39028-755e-11e2-bf59-52540035b04c" class="external-link" target="_blank" rel="nofollow noopener">https://maloo.whamcloud.com/test_sets/25d39028-755e-11e2-bf59-52540035b04c</a>.</p> <p>The sub-test test_compilebench failed with the following error:</p> <blockquote> <p>compilebench failed: 1</p></blockquote> <p>MDS console:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>12:44:26:Lustre: DEBUG MARKER: == parallel-scale-nfsv4 test compilebench: compilebench ============================================== 12:44:25 (1360701865) 12:44:27:Lustre: DEBUG MARKER: /usr/sbin/lctl mark .\/compilebench -D \/mnt\/lustre\/d0.compilebench -i 2 -r 2 --makej 12:44:27:Lustre: DEBUG MARKER: ./compilebench -D /mnt/lustre/d0.compilebench -i 2 -r 2 --makej 13:06:42:mdt00_003: page allocation failure. order:5, mode:0x50 13:06:42:Pid: 22716, comm: mdt00_003 Not tainted 2.6.32-279.19.1.el6_lustre.x86_64 #1 13:06:42:Call Trace: 13:06:42: [&lt;ffffffff811231ff&gt;] ? __alloc_pages_nodemask+0x77f/0x940 13:06:42: [&lt;ffffffff8115d1a2&gt;] ? kmem_getpages+0x62/0x170 13:06:42: [&lt;ffffffff8115ddba&gt;] ? fallback_alloc+0x1ba/0x270 13:06:42: [&lt;ffffffff8115d80f&gt;] ? cache_grow+0x2cf/0x320 13:06:42: [&lt;ffffffff8115db39&gt;] ? ____cache_alloc_node+0x99/0x160 13:06:42: [&lt;ffffffffa04d8b60&gt;] ? cfs_alloc+0x30/0x60 [libcfs] 13:06:42: [&lt;ffffffff8115e909&gt;] ? __kmalloc+0x189/0x220 13:06:42: [&lt;ffffffffa04d8b60&gt;] ? cfs_alloc+0x30/0x60 [libcfs] 13:06:42: [&lt;ffffffffa0d3b69e&gt;] ? osd_key_init+0x1e/0x670 [osd_ldiskfs] 13:06:42: [&lt;ffffffffa066622f&gt;] ? keys_fill+0x6f/0x190 [obdclass] 13:06:42: [&lt;ffffffffa0669e6b&gt;] ? lu_context_init+0xab/0x260 [obdclass] 13:06:42: [&lt;ffffffffa066a03e&gt;] ? lu_env_init+0x1e/0x30 [obdclass] 13:06:42: [&lt;ffffffffa0e775ff&gt;] ? mdt_lvbo_fill+0x1af/0x800 [mdt] 13:06:42: [&lt;ffffffffa0e77450&gt;] ? mdt_lvbo_fill+0x0/0x800 [mdt] 13:06:42: [&lt;ffffffffa07c6591&gt;] ? ldlm_handle_enqueue0+0x641/0x1080 [ptlrpc] 13:06:42: [&lt;ffffffffa0e4e376&gt;] ? mdt_enqueue+0x46/0x110 [mdt] 13:06:42: [&lt;ffffffffa0e42fb8&gt;] ? mdt_handle_common+0x628/0x1620 [mdt] 13:06:42: [&lt;ffffffffa0e7a5c5&gt;] ? mds_regular_handle+0x15/0x20 [mdt] 13:06:42: [&lt;ffffffffa07f800c&gt;] ? ptlrpc_server_handle_request+0x41c/0xdf0 [ptlrpc] 13:06:42: [&lt;ffffffffa04d85de&gt;] ? cfs_timer_arm+0xe/0x10 [libcfs] 13:06:42: [&lt;ffffffffa07ef739&gt;] ? ptlrpc_wait_event+0xa9/0x290 [ptlrpc] 13:06:42: [&lt;ffffffff81052223&gt;] ? __wake_up+0x53/0x70 13:06:42: [&lt;ffffffffa07f9556&gt;] ? ptlrpc_main+0xb76/0x1870 [ptlrpc] 13:06:42: [&lt;ffffffffa07f89e0&gt;] ? ptlrpc_main+0x0/0x1870 [ptlrpc] 13:06:42: [&lt;ffffffff8100c0ca&gt;] ? child_rip+0xa/0x20 13:06:42: [&lt;ffffffffa07f89e0&gt;] ? ptlrpc_main+0x0/0x1870 [ptlrpc] 13:06:42: [&lt;ffffffffa07f89e0&gt;] ? ptlrpc_main+0x0/0x1870 [ptlrpc] 13:06:42: [&lt;ffffffff8100c0c0&gt;] ? child_rip+0x0/0x20 13:06:42:Mem-Info: 13:06:42:Node 0 DMA per-cpu: 13:06:42:CPU 0: hi: 0, btch: 1 usd: 0 13:06:42:Node 0 DMA32 per-cpu: 13:06:42:CPU 0: hi: 186, btch: 31 usd: 152 13:06:42:active_anon:4078 inactive_anon:1377 isolated_anon:0 13:06:42: active_file:109040 inactive_file:162532 isolated_file:0 13:06:42: unevictable:0 dirty:14064 writeback:512 unstable:0 13:06:42: free:14243 slab_reclaimable:32585 slab_unreclaimable:116609 13:06:42: mapped:3106 shmem:41 pagetables:752 bounce:0 13:06:42:Node 0 DMA free:8348kB min:332kB low:412kB high:496kB active_anon:0kB inactive_anon:0kB active_file:184kB inactive_file:3376kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15324kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:556kB slab_unreclaimable:3268kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no 13:06:42:lowmem_reserve[]: 0 2003 2003 2003 13:06:42:Node 0 DMA32 free:48624kB min:44720kB low:55900kB high:67080kB active_anon:16312kB inactive_anon:5508kB active_file:435976kB inactive_file:646752kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:2052064kB mlocked:0kB dirty:56256kB writeback:2048kB mapped:12424kB shmem:164kB slab_reclaimable:129784kB slab_unreclaimable:463168kB kernel_stack:1960kB pagetables:3008kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no 13:06:42:lowmem_reserve[]: 0 0 0 0 13:06:42:Node 0 DMA: 33*4kB 5*8kB 3*16kB 0*32kB 1*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 3*2048kB 0*4096kB = 8348kB 13:06:42:Node 0 DMA32: 5780*4kB 2228*8kB 4*16kB 28*32kB 3*64kB 3*128kB 2*256kB 1*512kB 1*1024kB 0*2048kB 1*4096kB = 48624kB 13:06:42:195649 total pagecache pages 13:06:42:0 pages in swap cache 13:06:42:Swap cache stats: add 0, delete 0, find 0/0 13:06:42:Free swap = 4128760kB 13:06:42:Total swap = 4128760kB 13:06:42:524284 pages RAM 13:06:42:43608 pages reserved 13:06:42:207968 pages shared 13:06:42:267301 pages non-shared 13:06:42:LustreError: 22716:0:(mdt_lvb.c:126:mdt_lvbo_fill()) ASSERTION( rc == 0 ) failed: 13:06:42:LustreError: 22716:0:(mdt_lvb.c:126:mdt_lvbo_fill()) LBUG 13:06:42:Pid: 22716, comm: mdt00_003 13:06:42: 13:06:42:Call Trace: 13:06:42: [&lt;ffffffffa04d7895&gt;] libcfs_debug_dumpstack+0x55/0x80 [libcfs] 13:06:42: [&lt;ffffffffa04d7e97&gt;] lbug_with_loc+0x47/0xb0 [libcfs] 13:06:42: [&lt;ffffffffa0e77bd5&gt;] mdt_lvbo_fill+0x785/0x800 [mdt] 13:06:42: [&lt;ffffffffa0e77450&gt;] ? mdt_lvbo_fill+0x0/0x800 [mdt] 13:06:42: [&lt;ffffffffa07c6591&gt;] ldlm_handle_enqueue0+0x641/0x1080 [ptlrpc] 13:06:42: [&lt;ffffffffa0e4e376&gt;] mdt_enqueue+0x46/0x110 [mdt] 13:06:43: [&lt;ffffffffa0e42fb8&gt;] mdt_handle_common+0x628/0x1620 [mdt] 13:06:43: [&lt;ffffffffa0e7a5c5&gt;] mds_regular_handle+0x15/0x20 [mdt] 13:06:43: [&lt;ffffffffa07f800c&gt;] ptlrpc_server_handle_request+0x41c/0xdf0 [ptlrpc] 13:06:43: [&lt;ffffffffa04d85de&gt;] ? cfs_timer_arm+0xe/0x10 [libcfs] 13:06:43: [&lt;ffffffffa07ef739&gt;] ? ptlrpc_wait_event+0xa9/0x290 [ptlrpc] 13:06:43: [&lt;ffffffff81052223&gt;] ? __wake_up+0x53/0x70 13:06:43: [&lt;ffffffffa07f9556&gt;] ptlrpc_main+0xb76/0x1870 [ptlrpc] 13:06:43: [&lt;ffffffffa07f89e0&gt;] ? ptlrpc_main+0x0/0x1870 [ptlrpc] 13:06:43: [&lt;ffffffff8100c0ca&gt;] child_rip+0xa/0x20 13:06:43: [&lt;ffffffffa07f89e0&gt;] ? ptlrpc_main+0x0/0x1870 [ptlrpc] 13:06:43: [&lt;ffffffffa07f89e0&gt;] ? ptlrpc_main+0x0/0x1870 [ptlrpc] 13:06:43: [&lt;ffffffff8100c0c0&gt;] ? child_rip+0x0/0x20 13:06:43: 13:06:43:Kernel panic - not syncing: LBUG </pre> </div></div> LU-2818

Failure on test suite parallel-scale-nfsv4 test_compilebench: (mdt_lvb.c:126:mdt_lvbo_fill()) ASSERTION( rc == 0 ) failed

Bug Major Resolved Fixed Hongchao Zhang Maloo Fri, 15 Feb 2013 03:22:53 +0000 Wed, 17 Mar 2021 03:48:16 +0000 Tue, 11 Feb 2014 20:46:56 +0000 Lustre 2.4.0 Lustre 2.5.0 Lustre 2.6.0 Lustre 2.5.1 0 9 <p>this bug can be mitigated greatly by the patches(<a href="http://review.whamcloud.com/#change,5323" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/#change,5323</a>, <a href="http://review.whamcloud.com/#change,5444" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/#change,5444</a>) in <a href="https://jira.whamcloud.com/browse/LU-2748" title="OSD uses kmalloc with high order to allocate a keys" class="issue-link" data-issue-key="LU-2748"><del>LU-2748</del></a>.<br/> and I am also creating a patch to let "mdt_lvbo_fill" to find the corresponding "lu_env" in the current ptlrpc_thread to eliminate the need to<br/> allocate a new "lu_env".</p> <p>the additional patch is tracked at <a href="http://review.whamcloud.com/#change,5497" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/#change,5497</a></p> <p>status update:</p> <p>the patch which adding "lu_env" to "LDLM" modules is not ready yet for its complexity, and it affects lots of funtions.<br/> it's better to test&amp;merge the patches in <a href="https://jira.whamcloud.com/browse/LU-2748" title="OSD uses kmalloc with high order to allocate a keys" class="issue-link" data-issue-key="LU-2748"><del>LU-2748</del></a>, then this ticket can be dropped as a blocker.</p> <p>we're not allocating large chunks for osd_thread_info anymore, so this isn't a blocker already.</p> <p>the patch passing the "env" into ldlm module has been pushed to Gerrit.</p> <p>I am now frequently hitting this again while running sanity in a loop, this didi not happen bfore in this sort of a test on same config node, so we probably need to take another look at this?</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>&lt;4&gt;[13497.371686] mdt00_004: page allocation failure. order:1, mode:0x40 &lt;4&gt;[13497.372009] Pid: 11831, comm: mdt00_004 Not tainted 2.6.32-rhe6.4-debug #2 &lt;4&gt;[13497.372016] Call Trace: &lt;4&gt;[13497.372016] [&lt;ffffffff8112a666&gt;] ? __alloc_pages_nodemask+0x7c6/0x980 &lt;4&gt;[13497.372016] [&lt;ffffffff814fe0ee&gt;] ? _spin_unlock+0xe/0x10 &lt;4&gt;[13497.372016] [&lt;ffffffff811658f2&gt;] ? kmem_getpages+0x62/0x170 &lt;4&gt;[13497.372016] [&lt;ffffffff8116834a&gt;] ? fallback_alloc+0x1ba/0x270 &lt;4&gt;[13497.372016] [&lt;ffffffff81167bf7&gt;] ? cache_grow+0x4d7/0x520 &lt;4&gt;[13497.372016] [&lt;ffffffff81168038&gt;] ? ____cache_alloc_node+0xa8/0x200 &lt;4&gt;[13497.372016] [&lt;ffffffff81168943&gt;] ? kmem_cache_alloc_trace+0x1c3/0x250 &lt;4&gt;[13497.372016] [&lt;ffffffffa0b4f2a5&gt;] ? osd_key_init+0x25/0x4e0 [osd_ldiskfs] &lt;4&gt;[13497.372016] [&lt;ffffffffa0b4f2a5&gt;] ? osd_key_init+0x25/0x4e0 [osd_ldiskfs] &lt;4&gt;[13497.372016] [&lt;ffffffffa04f8f8f&gt;] ? keys_fill+0x6f/0x190 [obdclass] &lt;4&gt;[13497.372016] [&lt;ffffffffa04fd00e&gt;] ? lu_context_init+0x4e/0x240 [obdclass] &lt;4&gt;[13497.372016] [&lt;ffffffffa04fd063&gt;] ? lu_context_init+0xa3/0x240 [obdclass] &lt;4&gt;[13497.372016] [&lt;ffffffffa04fd21e&gt;] ? lu_env_init+0x1e/0x30 [obdclass] &lt;4&gt;[13497.372016] [&lt;ffffffffa0bf131b&gt;] ? mdt_lvbo_fill+0x1ab/0x840 [mdt] &lt;4&gt;[13497.372016] [&lt;ffffffffa0bf1170&gt;] ? mdt_lvbo_fill+0x0/0x840 [mdt] &lt;4&gt;[13497.372016] [&lt;ffffffffa0664033&gt;] ? ldlm_handle_enqueue0+0x623/0x10c0 [ptlrpc] &lt;4&gt;[13497.372016] [&lt;ffffffffa0bb6a96&gt;] ? mdt_enqueue+0x46/0xe0 [mdt] &lt;4&gt;[13497.372016] [&lt;ffffffffa0bbcc57&gt;] ? mdt_handle_common+0x647/0x16d0 [mdt] &lt;4&gt;[13497.372016] [&lt;ffffffffa0bf54a5&gt;] ? mds_regular_handle+0x15/0x20 [mdt] &lt;4&gt;[13497.372016] [&lt;ffffffffa0693898&gt;] ? ptlrpc_server_handle_request+0x3a8/0xc70 [ptlrpc] &lt;4&gt;[13497.372016] [&lt;ffffffffa0a2155e&gt;] ? cfs_timer_arm+0xe/0x10 [libcfs] &lt;4&gt;[13497.372016] [&lt;ffffffffa0a32b9f&gt;] ? lc_watchdog_touch+0x6f/0x170 [libcfs] &lt;4&gt;[13497.372016] [&lt;ffffffffa068afb1&gt;] ? ptlrpc_wait_event+0xb1/0x2a0 [ptlrpc] &lt;4&gt;[13497.372016] [&lt;ffffffff81054613&gt;] ? __wake_up+0x53/0x70 &lt;4&gt;[13497.372016] [&lt;ffffffffa0694b82&gt;] ? ptlrpc_main+0xa22/0x1650 [ptlrpc] &lt;4&gt;[13497.372016] [&lt;ffffffffa0694160&gt;] ? ptlrpc_main+0x0/0x1650 [ptlrpc] &lt;4&gt;[13497.372016] [&lt;ffffffff81094606&gt;] ? kthread+0x96/0xa0 &lt;4&gt;[13497.372016] [&lt;ffffffff8100c10a&gt;] ? child_rip+0xa/0x20 &lt;4&gt;[13497.372016] [&lt;ffffffff81094570&gt;] ? kthread+0x0/0xa0 &lt;4&gt;[13497.372016] [&lt;ffffffff8100c100&gt;] ? child_rip+0x0/0x20 &lt;6&gt;[13497.372016] Mem-Info: &lt;4&gt;[13497.372016] Node 0 DMA per-cpu: &lt;4&gt;[13497.372016] CPU 0: hi: 0, btch: 1 usd: 0 &lt;4&gt;[13497.385289] CPU 1: hi: 0, btch: 1 usd: 0 &lt;4&gt;[13497.385289] CPU 2: hi: 0, btch: 1 usd: 0 &lt;4&gt;[13497.385289] CPU 3: hi: 0, btch: 1 usd: 0 &lt;4&gt;[13497.385289] Node 0 DMA32 per-cpu: &lt;4&gt;[13497.385289] CPU 0: hi: 186, btch: 31 usd: 26 &lt;4&gt;[13497.385289] CPU 1: hi: 186, btch: 31 usd: 75 &lt;4&gt;[13497.385289] CPU 2: hi: 186, btch: 31 usd: 177 &lt;4&gt;[13497.385289] CPU 3: hi: 186, btch: 31 usd: 170 &lt;4&gt;[13497.385289] active_anon:83027 inactive_anon:83006 isolated_anon:0 &lt;4&gt;[13497.385289] active_file:31104 inactive_file:29174 isolated_file:0 &lt;4&gt;[13497.385289] unevictable:0 dirty:59 writeback:55 unstable:0 &lt;4&gt;[13497.385289] free:13805 slab_reclaimable:79792 slab_unreclaimable:363470 &lt;4&gt;[13497.385289] mapped:669 shmem:163871 pagetables:341 bounce:0 &lt;4&gt;[13497.388538] Node 0 DMA free:9700kB min:136kB low:168kB high:204kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:9312kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes &lt;4&gt;[13497.389526] lowmem_reserve[]: 0 2967 2967 2967 &lt;4&gt;[13497.389526] Node 0 DMA32 free:45520kB min:44916kB low:56144kB high:67372kB active_anon:332000kB inactive_anon:332388kB active_file:124252kB inactive_file:116696kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3039080kB mlocked:0kB dirty:236kB writeback:220kB mapped:2676kB shmem:655484kB slab_reclaimable:319168kB slab_unreclaimable:1453880kB kernel_stack:2640kB pagetables:1364kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:861 all_unreclaimable? no &lt;4&gt;[13497.389526] lowmem_reserve[]: 0 0 0 0 &lt;4&gt;[13497.389526] Node 0 DMA: 3*4kB 1*8kB 3*16kB 1*32kB 2*64kB 0*128kB 1*256kB 0*512kB 1*1024kB 0*2048kB 2*4096kB = 9700kB &lt;4&gt;[13497.389526] Node 0 DMA32: 10258*4kB 18*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 1*4096kB = 45272kB &lt;4&gt;[13497.389526] 194553 total pagecache pages &lt;4&gt;[13497.389526] 0 pages in swap cache &lt;4&gt;[13497.389526] Swap cache stats: add 1550, delete 1550, find 434/448 &lt;4&gt;[13497.389526] Free swap = 2091392kB &lt;4&gt;[13497.389526] Total swap = 2097144kB &lt;6&gt;[13497.389526] 774397 pages RAM &lt;6&gt;[13497.389526] 38457 pages reserved &lt;6&gt;[13497.389526] 19663 pages shared &lt;6&gt;[13497.389526] 697781 pages non-shared &lt;0&gt;[13497.402539] LustreError: 11831:0:(mdt_lvb.c:125:mdt_lvbo_fill()) ASSERTION( rc == 0 ) failed: &lt;0&gt;[13497.403365] LustreError: 11831:0:(mdt_lvb.c:125:mdt_lvbo_fill()) LBUG &lt;4&gt;[13497.403820] Pid: 11831, comm: mdt00_004 &lt;4&gt;[13497.404356] &lt;4&gt;[13497.404356] Call Trace: &lt;4&gt;[13497.405032] [&lt;ffffffffa0a208a5&gt;] libcfs_debug_dumpstack+0x55/0x80 [libcfs] &lt;4&gt;[13497.405510] [&lt;ffffffffa0a20ea7&gt;] lbug_with_loc+0x47/0xb0 [libcfs] &lt;4&gt;[13497.405979] [&lt;ffffffffa0bf18d4&gt;] mdt_lvbo_fill+0x764/0x840 [mdt] &lt;4&gt;[13497.406426] [&lt;ffffffffa0bf1170&gt;] ? mdt_lvbo_fill+0x0/0x840 [mdt] &lt;4&gt;[13497.406735] [&lt;ffffffffa0664033&gt;] ldlm_handle_enqueue0+0x623/0x10c0 [ptlrpc] &lt;4&gt;[13497.407043] [&lt;ffffffffa0bb6a96&gt;] mdt_enqueue+0x46/0xe0 [mdt] &lt;4&gt;[13497.407317] [&lt;ffffffffa0bbcc57&gt;] mdt_handle_common+0x647/0x16d0 [mdt] &lt;4&gt;[13497.407604] [&lt;ffffffffa0bf54a5&gt;] mds_regular_handle+0x15/0x20 [mdt] &lt;4&gt;[13497.407908] [&lt;ffffffffa0693898&gt;] ptlrpc_server_handle_request+0x3a8/0xc70 [ptlrpc] &lt;4&gt;[13497.408502] [&lt;ffffffffa0a2155e&gt;] ? cfs_timer_arm+0xe/0x10 [libcfs] &lt;4&gt;[13497.408814] [&lt;ffffffffa0a32b9f&gt;] ? lc_watchdog_touch+0x6f/0x170 [libcfs] &lt;4&gt;[13497.409138] [&lt;ffffffffa068afb1&gt;] ? ptlrpc_wait_event+0xb1/0x2a0 [ptlrpc] &lt;4&gt;[13497.409425] [&lt;ffffffff81054613&gt;] ? __wake_up+0x53/0x70 &lt;4&gt;[13497.409706] [&lt;ffffffffa0694b82&gt;] ptlrpc_main+0xa22/0x1650 [ptlrpc] &lt;4&gt;[13497.410010] [&lt;ffffffffa0694160&gt;] ? ptlrpc_main+0x0/0x1650 [ptlrpc] &lt;4&gt;[13497.410288] [&lt;ffffffff81094606&gt;] kthread+0x96/0xa0 &lt;4&gt;[13497.410537] [&lt;ffffffff8100c10a&gt;] child_rip+0xa/0x20 &lt;4&gt;[13497.410790] [&lt;ffffffff81094570&gt;] ? kthread+0x0/0xa0 &lt;4&gt;[13497.411045] [&lt;ffffffff8100c100&gt;] ? child_rip+0x0/0x20 &lt;4&gt;[13497.411299] &lt;0&gt;[13497.681303] Kernel panic - not syncing: LBUG </pre> </div></div> <p>I think this can stop to happen once we start to fetch the layouts with explicit getxattr..</p> <p>Because I am really tired of hittign this issue, here's a patch to at least making mdt not crash when it happens:<br/> <a href="http://review.whamcloud.com/8947" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/8947</a></p> <p>Landed for 2.6</p> Duplicate LU-6472 Related LU-2748 Development Rank 1|hzvj6n: Rank (Obsolete) 6822 Severity