An extra note that may or may not be related, I just saw this whilst load testing: [177586.215195] swap_free: Unused swap offset entry 0000365b [177586.215224] BUG: Bad page map in process ceph-osd pte:006cb600 pmd:fea8a8067 [177586.215260] addr:00007f12dff8a000 vm_flags:00100077 anon_vma:ffff8807e6002000 mapping: (null) index:7f12dff8a [177586.215316] CPU: 22 PID: 48567 Comm: ceph-osd Tainted: GF B O-------------- 3.10.0-123.9.3.anchor.x86_64 #1 [177586.215318] Hardware name: Dell Inc. PowerEdge R720xd/0X3D66, BIOS 2.2.2 01/16/2014 [177586.215319] 00007f12dff8a000 00000000cdae60bd ffff88062ff6bc70 ffffffff815e23bb [177586.215324] ffff88062ff6bcb8 ffffffff81167b48 00000000006cb600 00000007f12dff8a [177586.215329] ffff880fea8a8c50 00000000006cb600 00007f12dff8a000 00007f12dffde000 [177586.215333] Call Trace: [177586.215337] [<ffffffff815e23bb>] dump_stack+0x19/0x1b [177586.215340] [<ffffffff81167b48>] print_bad_pte+0x1a8/0x240 [177586.215343] [<ffffffff811694b0>] unmap_page_range+0x5b0/0x860 [177586.215348] [<ffffffff811697e1>] unmap_single_vma+0x81/0xf0 [177586.215353] [<ffffffff8114fade>] ? lru_add_drain_cpu+0xce/0xe0 [177586.215358] [<ffffffff8116a9f5>] zap_page_range+0x105/0x170 [177586.215361] [<ffffffff81167354>] SyS_madvise+0x394/0x810 [177586.215366] [<ffffffff810c30a0>] ? SyS_futex+0x80/0x180 This was on a 3.10 kernel with the two patches mentioned earlier in this thread. I'm not suggesting it's related, just thought I'd note it as I've never seen a bad page mapping before.
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