Hi, Just got this BUG in my dmesg: [47504.938446] BUG: unable to handle kernel paging request at ffff884058ec3270 [47504.938488] IP: [] xfs_is_delayed_page+0x41/0xa0 [47504.938520] PGD 1a24063 PUD 0 [47504.938536] Oops: 0000 [#1] PREEMPT SMP [47504.938558] CPU 5 [47504.938568] Modules linked in: ipt_REDIRECT xt_CHECKSUM iptable_mangle bridge stp llc powernow_k8 cpufreq_stats cpufreq_powersave cpufreq_ondemand cpufreq_conservative cpufreq_userspace rfcomm bnep binfmt_misc fuse ipt_REJECT xt_state xt_tcpudp ipv6 iptable_filter ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables radeon ttm drm_kms_helper drm i2c_algo_bit cfbcopyarea cfbimgblt cfbfillrect freq_table mperf it87 hwmon_vid loop firewire_sbp2 snd_hda_codec_hdmi hid_a4tech usbhid snd_hda_codec_realtek k10temp hwmon snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss evdev i2c_piix4 btusb bluetooth snd_pcm snd_seq_oss snd_seq_midi_event snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc parport_pc parport button wmi processor thermal_sys ohci_hcd sr_mod cdrom firewire_ohci firewire_core crc_itu_t ssb ehci_hcd xhci_hcd usbcore [last unloaded: scsi_wait_scan] [47504.938999] [47504.939002] Pid: 11511, comm: flush-9:1 Not tainted 3.0.0-rc7 #157 Gigabyte Technology Co., Ltd. GA-870A-UD3/GA-870A-UD3 [47504.939002] RIP: 0010:[] [] xfs_is_delayed_page+0x41/0xa0 [47504.939002] RSP: 0018:ffff8802256836e0 EFLAGS: 00010287 [47504.939002] RAX: 0000000000000001 RBX: ffffea0000c01c08 RCX: 0000000000000020 [47504.939002] RDX: ffff884058ec3270 RSI: 0000000000000003 RDI: ffff880058ec3270 [47504.939002] RBP: ffff8802256836e0 R08: 00000000000fe2e8 R09: ffff880225683cb8 [47504.939002] R10: 57ffe6ff91801bd0 R11: 0000000000000024 R12: 0000000000000001 [47504.939002] R13: ffff880100fa7190 R14: ffff880225683900 R15: ffff880225683cb8 [47504.939002] FS: 00007fc28c6e8700(0000) GS:ffff88022fd40000(0000) knlGS:00000000f74286c0 [47504.939002] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [47504.939002] CR2: ffff884058ec3270 CR3: 0000000225c70000 CR4: 00000000000006e0 [47504.939002] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [47504.939002] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [47504.939002] Process flush-9:1 (pid: 11511, threadinfo ffff880225682000, task ffff8800cfa52d20) [47504.939002] Stack: [47504.939002] ffff880225683780 ffffffff8127cb01 00000000000fe2db ffff8802256838e0 [47504.939002] 00000000000fe2e8 ffff880225683cb8 ffff880225683900 ffff8802256838f0 [47504.939002] ffff8802256838e0 0000000100000000 ffff880058ec3208 00000000fe2e8000 [47504.939002] Call Trace: [47504.939002] [] xfs_convert_page.isra.10+0xa1/0x300 [47504.939002] [] xfs_cluster_write+0xf5/0x160 [47504.939002] [] xfs_vm_writepage+0x481/0x510 [47504.939002] [] __writepage+0x12/0x40 [47504.939002] [] write_cache_pages+0x1b9/0x4c0 [47504.939002] [] ? up+0x2c/0x50 [47504.939002] [] ? bdi_set_max_ratio+0x90/0x90 [47504.939002] [] generic_writepages+0x3b/0x60 [47504.939002] [] xfs_vm_writepages+0x4c/0x60 [47504.939002] [] do_writepages+0x1c/0x30 [47504.939002] [] writeback_single_inode+0xf6/0x260 [47504.939002] [] writeback_sb_inodes+0xdb/0x1b0 [47504.939002] [] writeback_inodes_wb+0x7b/0x150 [47504.939002] [] wb_writeback+0x4cb/0x520 [47504.939002] [] wb_check_old_data_flush+0xc8/0xd0 [47504.939002] [] wb_do_writeback+0x18d/0x270 [47504.939002] [] ? del_timer_sync+0x32/0x50 [47504.939002] [] ? init_timer_deferrable_key+0x20/0x20 [47504.939002] [] bdi_writeback_thread+0x84/0x300 [47504.939002] [] ? call_rcu+0x10/0x20 [47504.939002] [] ? wb_do_writeback+0x270/0x270 [47504.939002] [] kthread+0x87/0x90 [47504.939002] [] kernel_thread_helper+0x4/0x10 [47504.939002] [] ? kthread_worker_fn+0x190/0x190 [47504.939002] [] ? gs_change+0xb/0xb [47504.939002] Code: 31 c0 80 e6 08 74 4b 48 8b 07 f6 c4 08 74 6f 48 8b 7f 10 31 c0 48 89 fa eb 11 31 c0 83 fe 02 0f 94 c0 48 8b 52 08 48 39 d7 74 27 [47504.939002] 8b 0a 80 e5 10 75 e7 48 8b 0a 80 e5 02 74 27 48 8b 52 08 31 [47504.939002] RIP [] xfs_is_delayed_page+0x41/0xa0 [47504.939002] RSP [47504.939002] CR2: ffff884058ec3270 [47504.939002] ---[ end trace 3745557f071632d2 ]--- I don't have a way to reproduce this, but this is what I was doing when it happened: - 2 KVM guests running, 1 doing about 1MB/s I/O ocasionally - 1 process running and dumping core to /var/tmp/cores (on XFS filesystem). Coredump is 4.1G, so takes a while - wireshark, firefox, icedove etc. running but that shouldn't matter After I got this error I can't 'sync' anymore, it just hangs, and some windows in X are frozen as well (konsole with all its tabs), but launching new processes still works. Attached is my .config and dmesg. Looking at top: top - 23:54:01 up 13:35, 10 users, load average: 5.79, 6.16, 11.34 Tasks: 274 total, 1 running, 251 sleeping, 21 stopped, 1 zombie Cpu(s): 4.4%us, 0.7%sy, 0.0%ni, 62.1%id, 32.8%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 8180900k total, 8058764k used, 122136k free, 76112k buffers Swap: 4194264k total, 77560k used, 4116704k free, 3377104k cached Not sure what the BUG means: did XFS ran out of memory when trying to write the 4GB coredump, as it wanted to allocate an extra 4G temporarely to hold it? Best regards, --Edwin