I was using kvm with much success, until I decided to enable radeon KMS on a multiseat station. After some time, machine just hanged (well, it was still replying to ping) and kernel said what I pasted below. Not sure if it's kvm to blame, or radeon KMS, or... [ 923.418469] BUG: soft lockup - CPU#1 stuck for 61s! [qemu-kvm:3442] [ 923.418471] Modules linked in: radeon ttm drm_kms_helper drm i2c_algo_bit tun bridge stp af_packet coretemp ipv6 binfmt_misc loop dm_mod cpufreq_ondemand cpufreq_conservative cpufreq_powersave acpi_cpufreq freq_table kvm_intel kvm snd_hda_codec_atihdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_pcm snd_timer snd_mixer_oss snd soundcore snd_page_alloc serio_raw e1000e pcspkr i2c_i801 joydev iTCO_wdt thermal i2c_core iTCO_vendor_support processor button evdev sr_mod wmi sg ata_piix ahci libata sd_mod scsi_mod crc_t10dif raid1 ext4 jbd2 crc16 uhci_hcd ohci_hcd ehci_hcd usbhid hid usbcore [last unloaded: scsi_wait_scan] [ 923.418501] CPU 1 [ 923.418504] Pid: 3442, comm: qemu-kvm Not tainted 2.6.33-desktop-1mnb #1 DX58SO/ [ 923.418505] RIP: 0010:[<ffffffff8108c412>] [<ffffffff8108c412>] generic_exec_single+0x82/0xb0 [ 923.418511] RSP: 0018:ffff880237911a88 EFLAGS: 00000202 [ 923.418512] RAX: 0000000000000010 RBX: ffff880237911ac8 RCX: 0000000000000020 [ 923.418514] RDX: 0000000000000020 RSI: 0000000000000020 RDI: 0000000000000296 [ 923.418515] RBP: ffffffff8100aa0e R08: ffffffff813cff98 R09: 0000000000000000 [ 923.418517] R10: 0000000000000000 R11: 0000000000000400 R12: ffffffff8107b02e [ 923.418518] R13: ffff880237911a88 R14: 0000000000000286 R15: ffff880237871710 [ 923.418520] FS: 00007f0cb46fd710(0000) GS:ffff880008c20000(0000) knlGS:0000000000000000 [ 923.418521] CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b [ 923.418523] CR2: 00007f09d8114870 CR3: 000000023cd10000 CR4: 00000000000026e0 [ 923.418524] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 923.418526] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 923.418528] Process qemu-kvm (pid: 3442, threadinfo ffff880237910000, task ffff88023dfb4350) [ 923.418529] Stack: [ 923.418530] 0000880237911a98 ffff880008c503a0 0000000037911ab8 0000000000000002 [ 923.418532] <0> ffffffffa0383eb0 0000000000000001 ffffffff816c3548 ffff880008c35780 [ 923.418534] <0> ffff880237911b38 ffffffff8108c642 0000000000204fd0 0000000000015780 [ 923.418537] Call Trace: [ 923.418542] [<ffffffffa0383eb0>] ? __vcpu_clear+0x0/0xd0 [kvm_intel] [ 923.418545] [<ffffffff8108c642>] ? smp_call_function_single+0x152/0x160 [ 923.418548] [<ffffffffa0383eb0>] ? __vcpu_clear+0x0/0xd0 [kvm_intel] [ 923.418551] [<ffffffffa03851cb>] ? vmx_vcpu_load+0x4b/0x180 [kvm_intel] [ 923.418562] [<ffffffffa032e89a>] ? kvm_arch_vcpu_load+0x3a/0xa0 [kvm] [ 923.418567] [<ffffffffa0321af2>] ? kvm_sched_in+0x12/0x20 [kvm] [ 923.418570] [<ffffffff81046c89>] ? finish_task_switch+0x79/0xd0 [ 923.418573] [<ffffffff813b612f>] ? schedule+0x3ef/0xac0 [ 923.418580] [<ffffffffa032cf58>] ? kvm_set_rflags+0x38/0xa0 [kvm] [ 923.418588] [<ffffffffa03487c8>] ? kvm_apic_has_interrupt+0x48/0x90 [kvm] [ 923.418594] [<ffffffffa0321ced>] ? kvm_vcpu_block+0x6d/0xb0 [kvm] [ 923.418599] [<ffffffff81077000>] ? autoremove_wake_function+0x0/0x40 [ 923.418607] [<ffffffffa0337647>] ? kvm_arch_vcpu_ioctl_run+0x427/0xc50 [kvm] [ 923.418613] [<ffffffffa0324345>] ? kvm_vcpu_ioctl+0x485/0x5d0 [kvm] [ 923.418616] [<ffffffff8107b02e>] ? __hrtimer_start_range_ns+0x19e/0x470 [ 923.418619] [<ffffffff8113802d>] ? vfs_ioctl+0x3d/0xd0 [ 923.418622] [<ffffffff811385ba>] ? do_vfs_ioctl+0x8a/0x5a0 [ 923.418629] [<ffffffffa032d543>] ? kvm_on_user_return+0x73/0x80 [kvm] [ 923.418631] [<ffffffff81138b51>] ? sys_ioctl+0x81/0xa0 [ 923.418634] [<ffffffff8100a042>] ? system_call_fastpath+0x16/0x1b [ 923.418636] Code: 8b 55 08 49 89 5d 08 4c 89 2b 48 89 53 08 48 89 1a e8 c3 c6 32 00 4c 3b 6d c8 74 2b 45 85 ff 75 0a eb 0e 66 0f 1f 44 00 00 f3 90 <f6> 43 20 01 75 f8 48 8b 5d d8 4c 8b 65 e0 4c 8b 6d e8 4c 8b 75 [ 923.418653] Call Trace: [ 923.418655] [<ffffffff8108c437>] ? generic_exec_single+0xa7/0xb0 [ 923.418658] [<ffffffffa0383eb0>] ? __vcpu_clear+0x0/0xd0 [kvm_intel] [ 923.418661] [<ffffffff8108c642>] ? smp_call_function_single+0x152/0x160 [ 923.418664] [<ffffffffa0383eb0>] ? __vcpu_clear+0x0/0xd0 [kvm_intel] [ 923.418666] [<ffffffffa03851cb>] ? vmx_vcpu_load+0x4b/0x180 [kvm_intel] [ 923.418673] [<ffffffffa032e89a>] ? kvm_arch_vcpu_load+0x3a/0xa0 [kvm] [ 923.418679] [<ffffffffa0321af2>] ? kvm_sched_in+0x12/0x20 [kvm] [ 923.418681] [<ffffffff81046c89>] ? finish_task_switch+0x79/0xd0 [ 923.418683] [<ffffffff813b612f>] ? schedule+0x3ef/0xac0 [ 923.418690] [<ffffffffa032cf58>] ? kvm_set_rflags+0x38/0xa0 [kvm] [ 923.418697] [<ffffffffa03487c8>] ? kvm_apic_has_interrupt+0x48/0x90 [kvm] [ 923.418703] [<ffffffffa0321ced>] ? kvm_vcpu_block+0x6d/0xb0 [kvm] [ 923.418705] [<ffffffff81077000>] ? autoremove_wake_function+0x0/0x40 [ 923.418712] [<ffffffffa0337647>] ? kvm_arch_vcpu_ioctl_run+0x427/0xc50 [kvm] [ 923.418718] [<ffffffffa0324345>] ? kvm_vcpu_ioctl+0x485/0x5d0 [kvm] [ 923.418721] [<ffffffff8107b02e>] ? __hrtimer_start_range_ns+0x19e/0x470 [ 923.418723] [<ffffffff8113802d>] ? vfs_ioctl+0x3d/0xd0 [ 923.418725] [<ffffffff811385ba>] ? do_vfs_ioctl+0x8a/0x5a0 [ 923.418732] [<ffffffffa032d543>] ? kvm_on_user_return+0x73/0x80 [kvm] [ 923.418734] [<ffffffff81138b51>] ? sys_ioctl+0x81/0xa0 [ 923.418737] [<ffffffff8100a042>] ? system_call_fastpath+0x16/0x1b -- Tomasz Chmielewski http://wpkg.org -- 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
