Hello<br><br>This appeared in my messages log:<br><br>Jul 24 07:27:41 tilesrv2 kernel: BUG: soft lockup detected on CPU#0!<br>Jul 24 07:27:41 tilesrv2 kernel: <br>Jul 24 07:27:41 tilesrv2 kernel: Call Trace:<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; &lt;IRQ&gt;&nbsp; [&lt;ffffffff800b2ca3&gt;] softlockup_tick+0xdb/0xed
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff80093424&gt;] update_process_times+0x42/0x68<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff80073d99&gt;] smp_local_timer_interrupt+0x23/0x47<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8007445b&gt;] smp_apic_timer_interrupt+0x41/0x47
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8005bcc2&gt;] apic_timer_interrupt+0x66/0x6c<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; &lt;EOI&gt;&nbsp; [&lt;ffffffff8006270f&gt;] .text.lock.spinlock+0x5/0x30<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff884da534&gt;] :ocfs2_dlm:dlm_assert_master_handler+0x93d/0xd3a
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8001c239&gt;] __mod_timer+0xb0/0xbe<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8849f3a7&gt;] :ocfs2_nodemanager:o2net_rx_until_empty+0x0/0x9ca<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8849dfcf&gt;] :ocfs2_nodemanager:o2net_process_message+0x3ef/0x58b
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8849fbf6&gt;] :ocfs2_nodemanager:o2net_rx_until_empty+0x84f/0x9ca<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8849f3a7&gt;] :ocfs2_nodemanager:o2net_rx_until_empty+0x0/0x9ca
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8004b2cf&gt;] run_workqueue+0x94/0xe5<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff80047c2e&gt;] worker_thread+0x0/0x122<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8009b4f6&gt;] keventd_create_kthread+0x0/0x61
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff80047d1e&gt;] worker_thread+0xf0/0x122<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff80086c6f&gt;] default_wake_function+0x0/0xe<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8009b4f6&gt;] keventd_create_kthread+0x0/0x61
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8009b4f6&gt;] keventd_create_kthread+0x0/0x61<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff80032189&gt;] kthread+0xfe/0x132<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8005bfe5&gt;] child_rip+0xa/0x11
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8009b4f6&gt;] keventd_create_kthread+0x0/0x61<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8003208b&gt;] kthread+0x0/0x132<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8005bfdb&gt;] child_rip+0x0/0x11
<br>Jul 24 07:27:41 tilesrv2 kernel: <br>Jul 24 07:27:41 tilesrv2 kernel: BUG: soft lockup detected on CPU#1!<br>Jul 24 07:27:41 tilesrv2 kernel: <br>Jul 24 07:27:41 tilesrv2 kernel: Call Trace:<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; &lt;IRQ&gt;&nbsp; [&lt;ffffffff800b2ca3&gt;] softlockup_tick+0xdb/0xed
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff80093424&gt;] update_process_times+0x42/0x68<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff80073d99&gt;] smp_local_timer_interrupt+0x23/0x47<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8007445b&gt;] smp_apic_timer_interrupt+0x41/0x47
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8005bcc2&gt;] apic_timer_interrupt+0x66/0x6c<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; &lt;EOI&gt;&nbsp; [&lt;ffffffff884d2e44&gt;] :ocfs2_dlm:__dlm_lookup_lockres_full+0xbe/0x108<br>
Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff884d2e55&gt;] :ocfs2_dlm:__dlm_lookup_lockres_full+0xcf/0x108<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff884dadaf&gt;] :ocfs2_dlm:dlm_get_lock_resource+0xcb/0x18e4<br>
Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff80061552&gt;] __wait_on_bit+0x60/0x6f<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff80014bf0&gt;] sync_buffer+0x0/0x3f<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff884e29d8&gt;] :ocfs2_dlm:dlm_in_recovery+0xd/0x20
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff884e6ec1&gt;] :ocfs2_dlm:dlm_wait_for_recovery+0xa1/0x116<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885ecfdb&gt;] :ocfs2:ocfs2_inode_ast_func+0x0/0x6da<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff884e0424&gt;] :ocfs2_dlm:dlmlock+0x751/0x1220
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885f677d&gt;] :ocfs2:ocfs2_populate_inode+0x4d3/0x558<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8002cc23&gt;] wake_up_bit+0x11/0x22<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885e915a&gt;] :ocfs2:ocfs2_cluster_unlock+0x65/0x2cb
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885e9509&gt;] :ocfs2:ocfs2_meta_unlock+0x121/0x180<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885ea34a&gt;] :ocfs2:ocfs2_lock_create+0x137/0x346<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885ed6b5&gt;] :ocfs2:ocfs2_inode_bast_func+0x0/0x15b
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885ea943&gt;] :ocfs2:ocfs2_cluster_lock+0x205/0x898<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885e8a3e&gt;] :ocfs2:ocfs2_status_completion_cb+0x0/0xb<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885eeaf1&gt;] :ocfs2:ocfs2_meta_lock_full+0x216/0xd35
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885f7f7f&gt;] :ocfs2:ocfs2_inode_revalidate+0x14f/0x228<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885f2fc6&gt;] :ocfs2:ocfs2_getattr+0x79/0x159<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8003e713&gt;] vfs_lstat_fd+0x2f/0x47
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff885e68c1&gt;] :ocfs2:ocfs2_readdir+0x40e/0x426<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff800252e1&gt;] filldir+0x0/0xb7<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8002a4da&gt;] sys_newlstat+0x19/0x31
<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8005b261&gt;] tracesys+0x71/0xdc<br>Jul 24 07:27:41 tilesrv2 kernel:&nbsp; [&lt;ffffffff8005b2c1&gt;] tracesys+0xd1/0xdc<br><br>Dell 1959 2xQuadcore, EMC 3-20, CentOS 5 2.6.18-8.1.8.el5
 OCFS2 1.2.6-1<br><br>What can cause this? Where do I start looking?<br><br>Daniel<br><br><br>