[LU-3945] lu_site_purge()) ASSERTION( atomic_read(&h->loh_ref) == 0 ) failed

Wed, 3 Dec 2014 12:45:29 +0000

This happened overnight - I couldn't see an existing report after a quick search. The only slightly odd thing in our setup is that we have the Lustre client mounted on MDS node (for faster deletes).

<0>LustreError: 355:0:(lu_object.c:341:lu_site_purge()) ASSERTION( atomic_read(&h->loh_ref) == 0 ) failed: 
<0>LustreError: 355:0:(lu_object.c:341:lu_site_purge()) LBUG
<4>Pid: 355, comm: kswapd1
<4>
<4>Call Trace:
<4> [<ffffffffa04a2895>] libcfs_debug_dumpstack+0x55/0x80 [libcfs]
<4> [<ffffffffa04a2e97>] lbug_with_loc+0x47/0xb0 [libcfs]
<4> [<ffffffffa05ebc95>] lu_site_purge+0x3a5/0x4a0 [obdclass]
<4> [<ffffffffa04b932e>] ? cfs_hash_spin_lock+0xe/0x10 [libcfs]
<4> [<ffffffffa05ea1ec>] ? lu_site_stats_get+0x13c/0x150 [obdclass]
<4> [<ffffffff8119cccf>] ? destroy_inode+0x2f/0x60
<4> [<ffffffffa05ebe68>] lu_cache_shrink+0xd8/0x280 [obdclass]
<4> [<ffffffff81131f0a>] shrink_slab+0x12a/0x1a0
<4> [<ffffffff811350fa>] balance_pgdat+0x59a/0x820
<4> [<ffffffff811354b4>] kswapd+0x134/0x3c0
<4> [<ffffffff81096ca0>] ? autoremove_wake_function+0x0/0x40
<4> [<ffffffff81135380>] ? kswapd+0x0/0x3c0
<4> [<ffffffff81096936>] kthread+0x96/0xa0
<4> [<ffffffff8100c0ca>] child_rip+0xa/0x20
<4> [<ffffffff810968a0>] ? kthread+0x0/0xa0
<4> [<ffffffff8100c0c0>] ? child_rip+0x0/0x20
<4>
<0>Kernel panic - not syncing: LBUG
<4>Pid: 355, comm: kswapd1 Not tainted 2.6.32-358.6.2.el6_lustre.g230b174.x86_64 #1
<4>Call Trace:
<4> [<ffffffff8150d878>] ? panic+0xa7/0x16f
<4> [<ffffffffa04a2eeb>] ? lbug_with_loc+0x9b/0xb0 [libcfs]
<4> [<ffffffffa05ebc95>] ? lu_site_purge+0x3a5/0x4a0 [obdclass]
<4> [<ffffffffa04b932e>] ? cfs_hash_spin_lock+0xe/0x10 [libcfs]
<4> [<ffffffffa05ea1ec>] ? lu_site_stats_get+0x13c/0x150 [obdclass]
<4> [<ffffffff8119cccf>] ? destroy_inode+0x2f/0x60
<4> [<ffffffffa05ebe68>] ? lu_cache_shrink+0xd8/0x280 [obdclass]
<4> [<ffffffff81131f0a>] ? shrink_slab+0x12a/0x1a0
<4> [<ffffffff811350fa>] ? balance_pgdat+0x59a/0x820
<4> [<ffffffff811354b4>] ? kswapd+0x134/0x3c0
<4> [<ffffffff81096ca0>] ? autoremove_wake_function+0x0/0x40
<4> [<ffffffff81135380>] ? kswapd+0x0/0x3c0
<4> [<ffffffff81096936>] ? kthread+0x96/0xa0
<4> [<ffffffff8100c0ca>] ? child_rip+0xa/0x20
<4> [<ffffffff810968a0>] ? kthread+0x0/0xa0
<4> [<ffffffff8100c0c0>] ? child_rip+0x0/0x20

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[LU-3945] lu_site_purge()) ASSERTION( atomic_read(&h->loh_ref) == 0 ) failed