Today when debugging why a server had become unresponsive for a few days I figured out it had had a "general protection fault" in the kernel. It was caused when running owserver. My guess is that owserver isn't really related and that I probably have bad memory or a kernel bug but I was wondering if anyone had seen this before. Here's the log:
Feb 18 13:36:56 ulisses kernel: [2074573.397734] general protection fault: 0000 [#1] SMP Feb 18 13:36:56 ulisses kernel: [2074573.397760] CPU 1 Feb 18 13:36:56 ulisses kernel: [2074573.397764] Modules linked in: btrfs zlib_deflate libcrc32c ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs reiserfs ext2 dm_crypt rc_dib0700_rc5 ir_lirc_codec lirc_dev ir_mce_kbd_decoder dvb_usb_dib0700 ir_sony_decoder dib7000p dib0090 dib7000m dib0070 ir_jvc_decoder dvb_usb snd_hda_codec_via ir_rc6_decoder ir_rc5_decoder dib8000 dvb_core usbhid snd_hda_intel snd_hda_codec ppdev ir_nec_decoder dib3000mc hid ds2490 snd_hwdep rc_core serio_raw dibx000_common snd_pcm wire snd_timer snd soundcore parport_pc mac_hid snd_page_alloc asus_atk0110 coretemp lp parport raid10 raid0 multipath linear raid1 raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx nouveau 8139too 8139cp ttm drm_kms_helper drm i2c_algo_bit mxm_wmi wmi video r8169 Feb 18 13:36:56 ulisses kernel: [2074573.397963] Feb 18 13:36:56 ulisses kernel: [2074573.397968] Pid: 4450, comm: owserver Not tainted 3.2.0-36-generic #57-Ubuntu System manufacturer System Product Name/P5G41C-M LX Feb 18 13:36:56 ulisses kernel: [2074573.397984] RIP: 0010:[<ffffffff81167af6>] [<ffffffff81167af6>] remove_migration_pte+0x196/0x300 Feb 18 13:36:56 ulisses kernel: [2074573.398002] RSP: 0018:ffff8800017a7830 EFLAGS: 00010207 Feb 18 13:36:56 ulisses kernel: [2074573.398009] RAX: 0c00014ec998b5c0 RBX: ffff880036baea00 RCX: 0c00174ec998b5c0 Feb 18 13:36:56 ulisses kernel: [2074573.398017] RDX: 000000000000001e RSI: ffff88007a4e9420 RDI: 6000ba764cc5aebc Feb 18 13:36:56 ulisses kernel: [2074573.398026] RBP: ffff8800017a7880 R08: 00003ffffffff000 R09: ffff880000000000 Feb 18 13:36:56 ulisses kernel: [2074573.398034] R10: ffff880079d20a08 R11: 0000000000000014 R12: 00007f40a8200000 Feb 18 13:36:56 ulisses kernel: [2074573.398042] R13: ffff88007a4e9420 R14: ffffea0001769880 R15: ffff880079d90000 Feb 18 13:36:56 ulisses kernel: [2074573.398051] FS: 00007fd385b9c700(0000) GS:ffff88007fc80000(0000) knlGS:0000000000000000 Feb 18 13:36:56 ulisses kernel: [2074573.398060] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Feb 18 13:36:56 ulisses kernel: [2074573.398067] CR2: 00007fe1d0d42000 CR3: 00000000017b0000 CR4: 00000000000006e0 Feb 18 13:36:56 ulisses kernel: [2074573.398075] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Feb 18 13:36:56 ulisses kernel: [2074573.398084] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Feb 18 13:36:56 ulisses kernel: [2074573.398092] Process owserver (pid: 4450, threadinfo ffff8800017a6000, task ffff8800787f1700) Feb 18 13:36:56 ulisses kernel: [2074573.398101] Stack: Feb 18 13:36:56 ulisses kernel: [2074573.398105] ffff8800017a78a8 ffffea0001769880 ffffea0001e76430 ffffea00004b3440 Feb 18 13:36:56 ulisses kernel: [2074573.398120] ffffffff81311ba9 ffff88007a4e9420 ffffea0001769880 ffffffff81167960 Feb 18 13:36:56 ulisses kernel: [2074573.398134] ffffea00004b3440 ffff88007a09d360 ffff8800017a7910 ffffffff8114a238 Feb 18 13:36:56 ulisses kernel: [2074573.398148] Call Trace: Feb 18 13:36:56 ulisses kernel: [2074573.398157] [<ffffffff81311ba9>] ? prio_tree_next+0x199/0x1a0 Feb 18 13:36:56 ulisses kernel: [2074573.398165] [<ffffffff81167960>] ? lock_page+0x40/0x40 Feb 18 13:36:56 ulisses kernel: [2074573.398175] [<ffffffff8114a238>] rmap_walk+0xc8/0x150 Feb 18 13:36:56 ulisses kernel: [2074573.398183] [<ffffffff811687a2>] move_to_new_page+0xe2/0x190 Feb 18 13:36:56 ulisses kernel: [2074573.398191] [<ffffffff81168c01>] __unmap_and_move+0x1f1/0x270 Feb 18 13:36:56 ulisses kernel: [2074573.398200] [<ffffffff81168d04>] unmap_and_move+0x84/0x150 Feb 18 13:36:56 ulisses kernel: [2074573.398208] [<ffffffff81168fce>] migrate_pages+0x9e/0x140 Feb 18 13:36:56 ulisses kernel: [2074573.398216] [<ffffffff8115c9a0>] ? isolate_freepages+0x210/0x210 Feb 18 13:36:56 ulisses kernel: [2074573.398225] [<ffffffff8115d1a1>] compact_zone.part.14+0x121/0x270 Feb 18 13:36:56 ulisses kernel: [2074573.398233] [<ffffffff8115d3d7>] compact_zone+0x37/0x50 Feb 18 13:36:56 ulisses kernel: [2074573.398241] [<ffffffff8115d563>] compact_zone_order+0x83/0xb0 Feb 18 13:36:56 ulisses kernel: [2074573.398250] [<ffffffff8115d65d>] try_to_compact_pages+0xcd/0x100 Feb 18 13:36:56 ulisses kernel: [2074573.398260] [<ffffffff81647d66>] __alloc_pages_direct_compact+0xb2/0x170 Feb 18 13:36:56 ulisses kernel: [2074573.398270] [<ffffffff81121c35>] __alloc_pages_nodemask+0x535/0x8f0 Feb 18 13:36:56 ulisses kernel: [2074573.398281] [<ffffffff810657f9>] ? dup_task_struct+0x39/0x1d0 Feb 18 13:36:56 ulisses kernel: [2074573.398289] [<ffffffff81065831>] dup_task_struct+0x71/0x1d0 Feb 18 13:36:56 ulisses kernel: [2074573.398298] [<ffffffff8106619e>] copy_process.part.18+0x6e/0xe80 Feb 18 13:36:56 ulisses kernel: [2074573.398307] [<ffffffff8165d529>] ? _raw_spin_unlock_bh+0x19/0x20 Feb 18 13:36:56 ulisses kernel: [2074573.398317] [<ffffffff8153122d>] ? release_sock+0x6d/0x80 Feb 18 13:36:56 ulisses kernel: [2074573.398325] [<ffffffff8165d41e>] ? _raw_spin_lock+0xe/0x20 Feb 18 13:36:56 ulisses kernel: [2074573.398334] [<ffffffff81177861>] ? fd_install+0x61/0x80 Feb 18 13:36:56 ulisses kernel: [2074573.398342] [<ffffffff81067027>] copy_process+0x77/0x80 Feb 18 13:36:56 ulisses kernel: [2074573.398350] [<ffffffff8106717a>] do_fork+0xfa/0x2e0 Feb 18 13:36:56 ulisses kernel: [2074573.398359] [<ffffffff8101d668>] sys_clone+0x28/0x30 Feb 18 13:36:56 ulisses kernel: [2074573.398367] [<ffffffff81665d23>] stub_clone+0x13/0x20 Feb 18 13:36:56 ulisses kernel: [2074573.398375] [<ffffffff81665a02>] ? system_call_fastpath+0x16/0x1b Feb 18 13:36:56 ulisses kernel: [2074573.398383] Code: fa 1e 74 09 83 fa 1f 0f 85 d8 00 00 00 48 b8 ff ff ff ff ff ff ff 01 48 21 c1 48 b8 00 00 00 00 00 ea ff ff 48 c1 e1 06 48 01 c8 <48> 8b 08 80 e1 01 0f 84 4e 01 00 00 48 39 45 c8 0f 85 a4 00 00 Feb 18 13:36:56 ulisses kernel: [2074573.398495] RIP [<ffffffff81167af6>] remove_migration_pte+0x196/0x300 Feb 18 13:36:56 ulisses kernel: [2074573.398505] RSP <ffff8800017a7830> Feb 18 13:36:56 ulisses kernel: [2074573.413064] ---[ end trace 5aebf6f0af9e3b29 ]--- ------------------------------------------------------------------------------ Everyone hates slow websites. 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