Hi *, we recently have encountered kvm_queue_exception events in dmesg. What is causing these exceptions? It appears that the guest is at least suffering performance loss. Is the qemu-system-x86 hang event linked to the exception? Is there anything we can do to prevent these exceptions to happen? Best regards, Sebastian --------------------------------- [1811816.496620] set_cr3: #GP, reserved bits [1811816.496624] ------------[ cut here ]------------ [1811816.496640] WARNING: at /usr/src/linux-2.6.31/arch/x86/kvm/x86.c:202 kvm_queue_exception_e+0x61/0x70 [kvm ]() [1811816.496643] Hardware name: S5520HC [1811816.496644] Modules linked in: drbd tun ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv 4 xt_state nf_conntrack ipt_REJECT xt_tcpudp ppdev iptable_filter ip_tables lp parport x_tables kvm_intel kvm bridge stp bonding e100 via_rhine 3c59x 8139too mii shpchp iTCO_wdt iTCO_vendor_support pcspkr joydev ses encl osure usbhid bnx2 aacraid e1000e igb dca fbcon tileblit font bitblit softcursor [1811816.496669] Pid: 26170, comm: qemu-system-x86 Not tainted 2.6.31-14-server #48 [1811816.496672] Call Trace: [1811816.496682] [<ffffffffa0140651>] ? kvm_queue_exception_e+0x61/0x70 [kvm] [1811816.496689] [<ffffffff8105f458>] warn_slowpath_common+0x78/0xd0 [1811816.496692] [<ffffffff8105f4bf>] warn_slowpath_null+0xf/0x20 [1811816.496701] [<ffffffffa0140651>] kvm_queue_exception_e+0x61/0x70 [kvm] [1811816.496711] [<ffffffffa01406ff>] load_guest_segment_descriptor+0x9f/0xb0 [kvm] [1811816.496721] [<ffffffffa0140753>] kvm_load_segment_descriptor+0x43/0x110 [kvm] [1811816.496730] [<ffffffffa0140a20>] ? kvm_inject_gp+0x10/0x20 [kvm] [1811816.496740] [<ffffffffa0140bed>] ? kvm_set_cr3+0x15d/0x170 [kvm] [1811816.496749] [<ffffffffa0140d67>] load_state_from_tss32+0x167/0x240 [kvm] [1811816.496758] [<ffffffffa0142a69>] kvm_task_switch_32+0x119/0x130 [kvm] [1811816.496768] [<ffffffffa0142f93>] kvm_task_switch+0x153/0x300 [kvm] [1811816.496777] [<ffffffffa0137df1>] ? gfn_to_hva+0x11/0x90 [kvm] [1811816.496786] [<ffffffffa0138122>] ? kvm_read_guest_page+0x62/0x70 [kvm] [1811816.496792] [<ffffffffa016cbab>] handle_task_switch+0x6b/0x160 [kvm_intel] [1811816.496796] [<ffffffffa0169b45>] vmx_handle_exit+0xf5/0x280 [kvm_intel] [1811816.496801] [<ffffffffa016d822>] ? vmx_vcpu_run+0x292/0x856 [kvm_intel] [1811816.496811] [<ffffffffa013ddbf>] vcpu_enter_guest+0x2cf/0x600 [kvm] [1811816.496814] [<ffffffff8107a12e>] ? finish_wait+0x5e/0x80 [1811816.496819] [<ffffffff81541710>] ? _spin_lock_irq+0x10/0x20 [1811816.496822] [<ffffffff81541603>] ? __down_read+0xc3/0xce [1811816.496825] [<ffffffff81079fa0>] ? autoremove_wake_function+0x0/0x40 [1811816.496834] [<ffffffffa013e153>] __vcpu_run+0x63/0x330 [kvm] [1811816.496844] [<ffffffffa01440ab>] kvm_arch_vcpu_ioctl_run+0x8b/0x1f0 [kvm] [1811816.496853] [<ffffffffa01367f2>] kvm_vcpu_ioctl+0x2e2/0x630 [kvm] [1811816.496856] [<ffffffff8106e99f>] ? dequeue_signal+0x9f/0x180 [1811816.496859] [<ffffffff81131d41>] vfs_ioctl+0x31/0xa0 [1811816.496862] [<ffffffff811321b3>] do_vfs_ioctl+0x373/0x400 [1811816.496864] [<ffffffff811322d9>] sys_ioctl+0x99/0xa0 [1811816.496862] [<ffffffff811321b3>] do_vfs_ioctl+0x373/0x400 [1811816.496864] [<ffffffff811322d9>] sys_ioctl+0x99/0xa0 [1811816.496867] [<ffffffff8106d3e9>] ? do_sigpending+0xa9/0xc0 [1811816.496870] [<ffffffff81012082>] system_call_fastpath+0x16/0x1b [1811816.496872] ---[ end trace c6ea0da2c3c9d0e4 ]--- [1811816.496887] set_cr3: #GP, pdptrs reserved bits [1811816.496889] ------------[ cut here ]------------ [1811816.496898] WARNING: at /usr/src/linux-2.6.31/arch/x86/kvm/x86.c:202 kvm_queue_exception_e+0x61/0x70 [kvm]() [1811816.496900] Hardware name: S5520HC [1811816.496901] Modules linked in: drbd tun ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp ppdev iptable_filter ip_tables lp parport x_tables kvm_intel kvm bridge stp bonding e100 via_rhine 3c59x 8139too mii shpchp iTCO_wdt iTCO_vendor_support pcspkr joydev ses enclosure usbhid bnx2 aacraid e1000e igb dca fbcon tileblit font bitblit softcursor [1811816.496923] Pid: 26170, comm: qemu-system-x86 Tainted: G W 2.6.31-14-server #48 [1811816.496925] Call Trace: [1811816.496934] [<ffffffffa0140651>] ? kvm_queue_exception_e+0x61/0x70 [kvm] [1811816.496937] [<ffffffff8105f458>] warn_slowpath_common+0x78/0xd0 [1811816.496940] [<ffffffff8105f4bf>] warn_slowpath_null+0xf/0x20 [1811816.496950] [<ffffffffa0140651>] kvm_queue_exception_e+0x61/0x70 [kvm] [1811816.496959] [<ffffffffa01406ff>] load_guest_segment_descriptor+0x9f/0xb0 [kvm] [1811816.496969] [<ffffffffa0140753>] kvm_load_segment_descriptor+0x43/0x110 [kvm] [1811816.496978] [<ffffffffa0140b52>] ? kvm_set_cr3+0xc2/0x170 [kvm] [1811816.496988] [<ffffffffa0140d9c>] load_state_from_tss32+0x19c/0x240 [kvm] [1811816.496997] [<ffffffffa0142a69>] kvm_task_switch_32+0x119/0x130 [kvm] [1811816.497006] [<ffffffffa0142f93>] kvm_task_switch+0x153/0x300 [kvm] [1811816.497015] [<ffffffffa0137df1>] ? gfn_to_hva+0x11/0x90 [kvm] [1811816.497024] [<ffffffffa0138122>] ? kvm_read_guest_page+0x62/0x70 [kvm] [1811816.497029] [<ffffffffa016cbab>] handle_task_switch+0x6b/0x160 [kvm_intel] [1811816.497034] [<ffffffffa0169b45>] vmx_handle_exit+0xf5/0x280 [kvm_intel] [1811816.497038] [<ffffffffa016d822>] ? vmx_vcpu_run+0x292/0x856 [kvm_intel] [1811816.497048] [<ffffffffa013ddbf>] vcpu_enter_guest+0x2cf/0x600 [kvm] [1811816.497052] [<ffffffffa01680e3>] ? __vmx_load_host_state+0xc3/0x1e0 [kvm_intel] [1811816.497055] [<ffffffff8107a12e>] ? finish_wait+0x5e/0x80 [1811816.497059] [<ffffffff81036609>] ? default_spin_lock_flags+0x9/0x10 [1811816.497062] [<ffffffff81541710>] ? _spin_lock_irq+0x10/0x20 [1811816.497065] [<ffffffff81541603>] ? __down_read+0xc3/0xce [1811816.497074] [<ffffffffa013e153>] __vcpu_run+0x63/0x330 [kvm] [1811816.497083] [<ffffffffa01440ab>] kvm_arch_vcpu_ioctl_run+0x8b/0x1f0 [kvm] [1811816.497092] [<ffffffffa01367f2>] kvm_vcpu_ioctl+0x2e2/0x630 [kvm] [1811816.497095] [<ffffffff8106e99f>] ? dequeue_signal+0x9f/0x180 [1811816.497098] [<ffffffff81131d41>] vfs_ioctl+0x31/0xa0 [1811816.497100] [<ffffffff811321b3>] do_vfs_ioctl+0x373/0x400 [1811816.497103] [<ffffffff811322d9>] sys_ioctl+0x99/0xa0 [1811816.497105] [<ffffffff8106d3e9>] ? do_sigpending+0xa9/0xc0 [1811816.497109] [<ffffffff81012082>] system_call_fastpath+0x16/0x1b [1811816.497110] ---[ end trace c6ea0da2c3c9d0e5 ]--- ...... [3307007.208029] INFO: task qemu-system-x86:5327 blocked for more than 120 seconds. [3307007.208176] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [3307007.208350] qemu-system-x D 00000000ffffffff 0 5327 1 0x00000000 [3307007.208356] ffff880bc80f3af8 0000000000000086 0000000000015880 0000000000015880 [3307007.208364] 0000000000015880 0000000000015880 0000000000015880 0000000000015880 [3307007.208369] 0000000000015880 ffff880c4f8fad60 ffff880654d48000 ffff880c4f8fb110 [3307007.208374] Call Trace: [3307007.208390] [<ffffffff8153f977>] io_schedule+0x37/0x50 [3307007.208403] [<ffffffff81151d11>] dio_await_completion+0x71/0x100 [3307007.208415] [<ffffffff81152136>] direct_io_worker+0x2b6/0x390 [3307007.208425] [<ffffffff81152497>] __blockdev_direct_IO+0x287/0x3f0 [3307007.208436] [<ffffffff8114f0c0>] ? blkdev_get_blocks+0x0/0xc0 [3307007.208445] [<ffffffff81150139>] blkdev_direct_IO+0x49/0x50 [3307007.208454] [<ffffffff8114f0c0>] ? blkdev_get_blocks+0x0/0xc0 [3307007.208468] [<ffffffff810de7d8>] generic_file_direct_write+0xc8/0x230 [3307007.208479] [<ffffffff810df19e>] __generic_file_aio_write_nolock+0x36e/0x470 [3307007.208494] [<ffffffff8107d7af>] ? hrtimer_try_to_cancel+0x3f/0x90 [3307007.208504] [<ffffffff810df2d7>] generic_file_aio_write_nolock+0x37/0xa0 [3307007.208516] [<ffffffff811224e1>] do_sync_write+0xf1/0x140 [3307007.208527] [<ffffffff81079fa0>] ? autoremove_wake_function+0x0/0x40 [3307007.208539] [<ffffffff81089e93>] ? futex_wake+0x113/0x130 [3307007.208552] [<ffffffff81226871>] ? security_file_permission+0x11/0x20 [3307007.208562] [<ffffffff81122b5b>] vfs_write+0xcb/0x130 [3307007.208571] [<ffffffff81122c52>] sys_pwrite64+0x92/0xa0 [3307007.208582] [<ffffffff81012082>] system_call_fastpath+0x16/0x1b [3307007.208592] INFO: task qemu-system-x86:5320 blocked for more than 120 seconds. [3307007.208724] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [3307007.208858] qemu-system-x D 0000000000000000 0 5320 1 0x00400000 [3307007.208863] ffff880bb3d45af8 0000000000000082 0000000000015880 0000000000015880 [3307007.208868] 0000000000015880 0000000000015880 0000000000015880 0000000000015880 [3307007.208873] 0000000000015880 ffff880c4fd2c410 ffff880654c94410 ffff880c4fd2c7c0 [3307007.208877] Call Trace: [3307007.208882] [<ffffffff8153f977>] io_schedule+0x37/0x50 [3307007.208886] [<ffffffff81151d11>] dio_await_completion+0x71/0x100 [3307007.208890] [<ffffffff81152136>] direct_io_worker+0x2b6/0x390 [3307007.208895] [<ffffffff81152497>] __blockdev_direct_IO+0x287/0x3f0 [3307007.208904] [<ffffffff8114f0c0>] ? blkdev_get_blocks+0x0/0xc0 [3307007.208916] [<ffffffff81150139>] blkdev_direct_IO+0x49/0x50 [3307007.208886] [<ffffffff81151d11>] dio_await_completion+0x71/0x100 [3307007.208890] [<ffffffff81152136>] direct_io_worker+0x2b6/0x390 [3307007.208895] [<ffffffff81152497>] __blockdev_direct_IO+0x287/0x3f0 [3307007.208904] [<ffffffff8114f0c0>] ? blkdev_get_blocks+0x0/0xc0 [3307007.208916] [<ffffffff81150139>] blkdev_direct_IO+0x49/0x50 [3307007.208926] [<ffffffff8114f0c0>] ? blkdev_get_blocks+0x0/0xc0 [3307007.208936] [<ffffffff810de7d8>] generic_file_direct_write+0xc8/0x230 [3307007.208949] [<ffffffff810df19e>] __generic_file_aio_write_nolock+0x36e/0x470 [3307007.208960] [<ffffffff8107d7af>] ? hrtimer_try_to_cancel+0x3f/0x90 [3307007.208971] [<ffffffff810df2d7>] generic_file_aio_write_nolock+0x37/0xa0 [3307007.208981] [<ffffffff811224e1>] do_sync_write+0xf1/0x140 [3307007.208991] [<ffffffff81079fa0>] ? autoremove_wake_function+0x0/0x40 [3307007.209002] [<ffffffff81089e93>] ? futex_wake+0x113/0x130 [3307007.209012] [<ffffffff81226871>] ? security_file_permission+0x11/0x20 [3307007.209023] [<ffffffff81122b5b>] vfs_write+0xcb/0x130 [3307007.209033] [<ffffffff81122c52>] sys_pwrite64+0x92/0xa0 [3307007.209043] [<ffffffff81012082>] system_call_fastpath+0x16/0x1b ...... [4837287.970390] set_cr3: #GP, reserved bits [4837287.970394] ------------[ cut here ]------------ [4837287.970411] WARNING: at /usr/src/linux-2.6.31/arch/x86/kvm/x86.c:202 kvm_queue_exception_e+0x61/0x70 [kvm]() [4837287.970413] Hardware name: S5520HC [4837287.970414] Modules linked in: drbd tun ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp ppdev iptable_filter ip_tables lp parport x_tables kvm_intel kvm bridge stp bonding e100 via_rhine 3c59x 8139too mii shpchp iTCO_wdt iTCO_vendor_support pcspkr joydev ses enclosure usbhid bnx2 aacraid e1000e igb dca fbcon tileblit font bitblit softcursor [4837287.970440] Pid: 6524, comm: qemu-system-x86 Tainted: G W 2.6.31-14-server #48 [4837287.970442] Call Trace: [4837287.970453] [<ffffffffa0140651>] ? kvm_queue_exception_e+0x61/0x70 [kvm] [4837287.970459] [<ffffffff8105f458>] warn_slowpath_common+0x78/0xd0 [4837287.970462] [<ffffffff8105f4bf>] warn_slowpath_null+0xf/0x20 [4837287.970472] [<ffffffffa0140651>] kvm_queue_exception_e+0x61/0x70 [kvm] [4837287.970481] [<ffffffffa01406ff>] load_guest_segment_descriptor+0x9f/0xb0 [kvm] [4837287.970491] [<ffffffffa0140753>] kvm_load_segment_descriptor+0x43/0x110 [kvm] [4837287.970501] [<ffffffffa0140bed>] ? kvm_set_cr3+0x15d/0x170 [kvm] [4837287.970510] [<ffffffffa0140d9c>] load_state_from_tss32+0x19c/0x240 [kvm] [4837287.970520] [<ffffffffa0142a69>] kvm_task_switch_32+0x119/0x130 [kvm] [4837287.970529] [<ffffffffa0142f93>] kvm_task_switch+0x153/0x300 [kvm] [4837287.970535] [<ffffffffa016cbab>] handle_task_switch+0x6b/0x160 [kvm_intel] [4837287.970540] [<ffffffffa0169b45>] vmx_handle_exit+0xf5/0x280 [kvm_intel] [4837287.970545] [<ffffffffa016d822>] ? vmx_vcpu_run+0x292/0x856 [kvm_intel] [4837287.970554] [<ffffffffa013ddbf>] vcpu_enter_guest+0x2cf/0x600 [kvm] [4837287.970558] [<ffffffff8107a12e>] ? finish_wait+0x5e/0x80 [4837287.970563] [<ffffffff81541710>] ? _spin_lock_irq+0x10/0x20 [4837287.970566] [<ffffffff81541603>] ? __down_read+0xc3/0xce [4837287.970568] [<ffffffff81079fa0>] ? autoremove_wake_function+0x0/0x40 [4837287.970578] [<ffffffffa013e153>] __vcpu_run+0x63/0x330 [kvm] [4837287.970587] [<ffffffffa01440ab>] kvm_arch_vcpu_ioctl_run+0x8b/0x1f0 [kvm] [4837287.970596] [<ffffffffa01367f2>] kvm_vcpu_ioctl+0x2e2/0x630 [kvm] [4837287.970599] [<ffffffff8106e99f>] ? dequeue_signal+0x9f/0x180 [4837287.970603] [<ffffffff81012a8e>] ? common_interrupt+0xe/0x13 [4837287.970607] [<ffffffff81131d41>] vfs_ioctl+0x31/0xa0 [4837287.970609] [<ffffffff811321b3>] do_vfs_ioctl+0x373/0x400 [4837287.970612] [<ffffffff811322db>] ? sys_ioctl+0x9b/0xa0 [4837287.970614] [<ffffffff811322d9>] sys_ioctl+0x99/0xa0 [4837287.970617] [<ffffffff8106d3e9>] ? do_sigpending+0xa9/0xc0 [4837287.970620] [<ffffffff81012082>] system_call_fastpath+0x16/0x1b [4837287.970622] ---[ end trace c6ea0da2c3c9d0e6 ]--- -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
