I was running a guest os using kvm and I got this kernel page request failure using kvm 33 and 2.6.22.1 host.
[12038.889793] Unable to handle kernel paging request at 0000000000100100 RIP: [12038.889799] [<ffffffff88bacd25>] :kvm:kvm_mmu_pte_write+0x95/0x2f0 [12038.889811] PGD 52d58067 PUD 533d1067 PMD 0 [12038.889814] Oops: 0000 [1] SMP [12038.889816] CPU 0 [12038.889817] Modules linked in: usb_storage tun crc32 kvm_intel kvm bridge ipv6 snd_pcm_oss snd_mixer_oss snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem snd_hwdep snd soundcore ext3 jbd libusual usbkbd usbmouse usbhid hid ff_memless nvidiafb fb fb_ddc backlight ohci1394 i2c_algo_bit ieee1394 cfbcopyarea vgastate generic bitrev cfbimgblt cfbfillrect amd74xx firewire_ohci firewire_core nvidia(P) ide_core serio_raw rtc tg3 crc_itu_t ehci_hcd ohci_hcd i2c_nforce2 8250_pnp 8250 serial_core pcspkr usbcore i2c_core psmouse shpchp pci_hotplug sg sr_mod cdrom evdev tsdev ext4dev mbcache jbd2 ata_generic pata_amd sata_nv libata sd_mod scsi_mod dm_mod [12038.889851] Pid: 4685, comm: qemu-system-x86 Tainted: P 2.6.22.1 #5 [12038.889853] RIP: 0010:[<ffffffff88bacd25>] [<ffffffff88bacd25>] :kvm:kvm_mmu_pte_write+0x95/0x2f0 [12038.889860] RSP: 0018:ffff81007202d928 EFLAGS: 00010206 [12038.889862] RAX: 00000000000004c8 RBX: ffff810072ff8000 RCX: ffff81007202db10 [12038.889864] RDX: 0000000000100100 RSI: 0000000000100100 RDI: 000000000000181d [12038.889866] RBP: ffff81004b1d5000 R08: 0000000000000004 R09: 0000000000000004 [12038.889868] R10: 0000000000000001 R11: ffffffff88bbc380 R12: ffff810065ba38c0 [12038.889870] R13: 0000000000000004 R14: ffff810072ffaf20 R15: 000000000000181d [12038.889872] FS: 0000000040800950(0063) GS:ffffffff8131f000(0000) knlGS:0000000000000000 [12038.889874] CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b [12038.889876] CR2: 0000000000100100 CR3: 000000007cc6a000 CR4: 00000000000026e0 [12038.889878] Process qemu-system-x86 (pid: 4685, threadinfo ffff81007202c000, task ffff8100532854a0) [12038.889880] Stack: 0000000000000004 ffff81007202db10 ffffffff88bb9620 ffffffff88bad6e1 [12038.889884] 0000000400000002 ffff81007202db10 00000000000004c8 0000000000100100 [12038.889887] 00000000000004c8 ffff81007a68b000 ffff81007a68b060 ffff810072ffaf20 [12038.889890] Call Trace: [12038.889897] [<ffffffff88bad6e1>] :kvm:paging64_gva_to_gpa+0x51/0x70 [12038.889905] [<ffffffff88ba7a66>] :kvm:emulator_write_emulated_onepage+0x136/0x1a0 [12038.889912] [<ffffffff88bafe43>] :kvm:x86_emulate_memop+0x1953/0x3e00 [12038.889917] [<ffffffff88bac693>] :kvm:gpa_to_hpa+0x23/0x40 [12038.889922] [<ffffffff88bacfe9>] :kvm:safe_gpa_to_hpa+0x9/0x30 [12038.889937] [<ffffffff88ba9557>] :kvm:emulate_instruction+0x137/0x290 [12038.889945] [<ffffffff8120a207>] mutex_lock+0x17/0x20 [12038.889948] [<ffffffff8103962e>] recalc_sigpending+0xe/0x30 [12038.889954] [<ffffffff88baa49a>] :kvm:kvm_vcpu_ioctl+0xdea/0xe90 [12038.889959] [<ffffffff810272bc>] task_rq_lock+0x4c/0x90 [12038.889962] [<ffffffff81026e32>] __activate_task+0x32/0x50 [12038.889965] [<ffffffff810299ed>] try_to_wake_up+0x5d/0x4b0 [12038.889970] [<ffffffff8104aade>] futex_wait+0x17e/0x3c0 [12038.889974] [<ffffffff810ee803>] avc_has_perm_noaudit+0x93/0x380 [12038.889981] [<ffffffff810ef6fa>] avc_has_perm+0x5a/0x80 [12038.889986] [<ffffffff810f076b>] inode_has_perm+0x5b/0xa0 [12038.889993] [<ffffffff8109db95>] do_ioctl+0x35/0xe0 [12038.889996] [<ffffffff8109dcb4>] vfs_ioctl+0x74/0x2d0 [12038.890000] [<ffffffff8109dfa5>] sys_ioctl+0x95/0xb0 [12038.890003] [<ffffffff8100a0fe>] system_call+0x7e/0x83 [12038.890008] [12038.890009] [12038.890009] Code: 48 8b 32 4c 8d 62 f0 48 89 74 24 38 4d 3b 7c 24 20 75 df 41 [12038.890016] RIP [<ffffffff88bacd25>] :kvm:kvm_mmu_pte_write+0x95/0x2f0 [12038.890022] RSP <ffff81007202d928> [12038.890023] CR2: 0000000000100100 [12038.890028] note: qemu-system-x86[4685] exited with preempt_count 1 [12038.890031] BUG: scheduling while atomic: qemu-system-x86/0x10000001/4685 [12038.890032] [12038.890033] Call Trace: [12038.890036] [<ffffffff81209101>] thread_return+0x211/0x6c0 [12038.890041] [<ffffffff8111c206>] vsnprintf+0x2d6/0x6b0 [12038.890046] [<ffffffff8102a2fc>] __cond_resched+0x1c/0x50 [12038.890049] [<ffffffff81209632>] cond_resched+0x32/0x40 [12038.890052] [<ffffffff81047549>] down_read+0x9/0x20 [12038.890054] [<ffffffff8104b024>] futex_wake+0x24/0xf0 [12038.890059] [<ffffffff8104b812>] do_futex+0x722/0xc00 [12038.890063] [<ffffffff8102fac9>] __call_console_drivers+0x69/0x80 [12038.890066] [<ffffffff8102ff6e>] release_console_sem+0x20e/0x230 [12038.890070] [<ffffffff8103050e>] printk+0x4e/0x60 [12038.890073] [<ffffffff8104bd69>] sys_futex+0x79/0x130 [12038.890078] [<ffffffff810316c6>] exit_mm+0x16/0xf0 [12038.890081] [<ffffffff81032f5e>] do_exit+0x15e/0x970 [12038.890085] [<ffffffff8120b4a8>] _spin_unlock_irqrestore+0x8/0x10 [12038.890089] [<ffffffff8101daad>] do_page_fault+0x5ad/0x8e0 [12038.890093] [<ffffffff810169b9>] smp_call_function_single+0xa9/0x100 [12038.890098] [<ffffffff88ba70a0>] :kvm:ack_flush+0x0/0x10 [12038.890103] [<ffffffff88bbc380>] :kvm_intel:vmx_get_segment_base+0x0/0x20 [12038.890108] [<ffffffff88ba71a3>] :kvm:gfn_to_page+0x23/0x50 [12038.890113] [<ffffffff88bac693>] :kvm:gpa_to_hpa+0x23/0x40 [12038.890118] [<ffffffff88bacfe9>] :kvm:safe_gpa_to_hpa+0x9/0x30 [12038.890123] [<ffffffff88bad585>] :kvm:paging64_walk_addr+0x245/0x350 [12038.890128] [<ffffffff8120b71d>] error_exit+0x0/0x84 [12038.890133] [<ffffffff88bbc380>] :kvm_intel:vmx_get_segment_base+0x0/0x20 [12038.890140] [<ffffffff88bacd25>] :kvm:kvm_mmu_pte_write+0x95/0x2f0 [12038.890145] [<ffffffff88bacced>] :kvm:kvm_mmu_pte_write+0x5d/0x2f0 [12038.890151] [<ffffffff88bad6e1>] :kvm:paging64_gva_to_gpa+0x51/0x70 [12038.890158] [<ffffffff88ba7a66>] :kvm:emulator_write_emulated_onepage+0x136/0x1a0 [12038.890165] [<ffffffff88bafe43>] :kvm:x86_emulate_memop+0x1953/0x3e00 [12038.890170] [<ffffffff88bac693>] :kvm:gpa_to_hpa+0x23/0x40 [12038.890175] [<ffffffff88bacfe9>] :kvm:safe_gpa_to_hpa+0x9/0x30 [12038.890190] [<ffffffff88ba9557>] :kvm:emulate_instruction+0x137/0x290 [12038.890195] [<ffffffff8120a207>] mutex_lock+0x17/0x20 [12038.890197] [<ffffffff8103962e>] recalc_sigpending+0xe/0x30 [12038.890203] [<ffffffff88baa49a>] :kvm:kvm_vcpu_ioctl+0xdea/0xe90 [12038.890206] [<ffffffff810272bc>] task_rq_lock+0x4c/0x90 [12038.890209] [<ffffffff81026e32>] __activate_task+0x32/0x50 [12038.890212] [<ffffffff810299ed>] try_to_wake_up+0x5d/0x4b0 [12038.890216] [<ffffffff8104aade>] futex_wait+0x17e/0x3c0 [12038.890218] [<ffffffff810ee803>] avc_has_perm_noaudit+0x93/0x380 [12038.890226] [<ffffffff810ef6fa>] avc_has_perm+0x5a/0x80 [12038.890232] [<ffffffff810f076b>] inode_has_perm+0x5b/0xa0 [12038.890238] [<ffffffff8109db95>] do_ioctl+0x35/0xe0 [12038.890241] [<ffffffff8109dcb4>] vfs_ioctl+0x74/0x2d0 [12038.890245] [<ffffffff8109dfa5>] sys_ioctl+0x95/0xb0 [12038.890248] [<ffffffff8100a0fe>] system_call+0x7e/0x83 [12038.890252] I am running a 64bit OS with a 32bit guest the guest happened to be rebuilding my system (yeah I'm one of those crazies that run's a compile from source distro) and it dumped this. Some info on the system: x86-64 one socket dual core pentium4 64bit Host x86-64 2 processor 32bit Guest cat /proc/cpuinfo ... processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz stepping : 6 cpu MHz : 2660.024 cache size : 4096 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 5320.30 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: Any help would be appreciated. Thanks, - David Brown ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. 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