Messages in this thread | | | Date | Wed, 11 Jul 2007 11:49:34 -0400 | From | Disconnect <> | Subject | Strange OOM problem (swap empty) |
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Last night one of our testbed fileservers went OOM for unknown reasons. (The log is attached.) Its a moderately complex setup - 2 dual-core Opteron chips with 8G of (matched) ram under Xen. The file array (which was doing heavy writes from this node using rsync) is an external multi-connected scsi using clvmd and ocfs2. (The other node had no problems, but it was not doing anything other than idling with 2 xen guests, also idle.)
Local filesystems and swap are on an internal scsi raid rather than the shared device.
The confusing part is that the dump shows swap almost completely unused. So shouldn't memory pressure have forced something out to swap?
I can provide any other info that would be helpful (and I'm subscribed to the list).
Jul 10 18:23:50 dvsc3 kernel: Free swap = 5961616kB Jul 10 18:23:50 dvsc3 kernel: Total swap = 6032368kB [unhandled content-type:application/octet-stream]host : dvsc3 release : 2.6.18-4-xen-amd64 version : #1 SMP Fri May 4 02:40:51 UTC 2007 machine : x86_64 nr_cpus : 4 nr_nodes : 1 sockets_per_node : 2 cores_per_socket : 2 threads_per_core : 1 cpu_mhz : 2193 hw_caps : 178bfbff:e3d3fbff:00000000:00000010:00000001:00000000:00000003 total_memory : 8191 free_memory : 6536 xen_major : 3 xen_minor : 0 xen_extra : .3-1 xen_caps : xen-3.0-x86_64 xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : Tue Oct 17 22:09:52 2006 +0100 cc_compiler : gcc version 4.1.2 20061028 (prerelease) (Debian 4.1.1-19) cc_compile_by : ultrotter cc_compile_domain : debian.org cc_compile_date : Fri Nov 3 00:21:27 CET 2006 xend_config_format : 2 [unhandled content-type:application/octet-stream][unhandled content-type:application/octet-stream]Name ID Mem(MiB) VCPUs State Time(s) Domain-0 0 512 4 r----- 24.7 dv-xeng3.internal 3 512 1 -b---- 2.2 dv-xeng5.internal 4 512 1 -b---- 2.1
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