Description of problem ---------------------- On boot on an Intel Haswell machine, I see the below softlockups, crashes, calltraces, === . . . [ 716.846912] BUG: soft lockup - CPU#1 stuck for 22s! [qemu-system-x86:911] [ 716.946229] hardirqs last enabled at (138600857): [<ffffffffa05395d3>] kvm_arch_vcpu_ioctl_run+0x363/0x1510 [kvm] [ 716.957970] hardirqs last disabled at (138600858): [<ffffffff817a7c2d>] apic_timer_interrupt+0x6d/0x80 [ 716.968523] softirqs last enabled at (138595310): [<ffffffff810991ce>] __do_softirq+0x1ce/0x460 [ 716.978493] softirqs last disabled at (138595305): [<ffffffff81099795>] irq_exit+0xc5/0xd0 [ 716.997812] Hardware name: Intel Corporation Shark Bay Client platform/Flathead Creek Crb, BIOS HSWLPTU1.86C.0109.R03.1301282055 01/28/2013 . . . [ 717.146239] [<ffffffffa053a436>] kvm_arch_vcpu_ioctl_run+0x11c6/0x1510 [kvm] [ 717.154314] [<ffffffffa05395c7>] ? kvm_arch_vcpu_ioctl_run+0x357/0x1510 [kvm] [ 717.162487] [<ffffffffa052067c>] ? vcpu_load+0x1c/0xa0 [kvm] [ 717.168995] [<ffffffffa05358fe>] ? kvm_arch_vcpu_load+0x4e/0x1e0 [kvm] [ 717.176487] [<ffffffffa05209fd>] kvm_vcpu_ioctl+0x2bd/0x670 [kvm] [ 717.183486] [<ffffffff810c4ee2>] ? creds_are_invalid.part.1+0x12/0x50 [ 717.190876] [<ffffffff810c4f41>] ? creds_are_invalid+0x21/0x30 [ 717.197580] [<ffffffff813415c6>] ? inode_has_perm.isra.51+0x26/0x80 [ 717.204775] [<ffffffff81237b70>] do_vfs_ioctl+0x300/0x520 [ 717.210986] [<ffffffff81341c2b>] ? selinux_file_ioctl+0x5b/0x110 [ 717.217884] [<ffffffff81237e11>] SyS_ioctl+0x81/0xa0 [ 717.223601] [<ffffffff817a6f29>] system_call_fastpath+0x16/0x1b . . . ==== Version ------- On L0 (physical host): $ uname -r; rpm -q qemu-system-x86 libvirt-daemon-kvm libguestfs 3.14.0-0.rc0.git9.1.fc21.x86_64 qemu-system-x86-1.7.0-4.fc21.x86_64 libvirt-daemon-kvm-1.2.1-1.fc21.x86_64 libguestfs-1.25.29-1.fc21.x86_64 How reproducible ---------------- Consistently Steps to Reproduce ------------------ 1. Install Kernel, QEMU, KVM from Rawhide to the above versions: $ yum uppdate kernel libvirt-daemon-kvm qemu-system-x86 \ libguestfs --enablerepo=rawhide 2. Reboot into the Kernel 3.14.0-0.rc0.git9.1.fc21 3. Observe boot messages over serial console Actual results: --------------- ==== . . . . [ 690.671628] virbr1: port 2(vnet0) entered listening state [ 690.677779] virbr1: port 2(vnet0) entered listening state [ 692.679932] virbr1: port 2(vnet0) entered learning state [ 694.682708] virbr1: topology change detected, propagating [ 694.688935] virbr1: port 2(vnet0) entered forwarding state [ 694.695360] IPv6: ADDRCONF(NETDEV_CHANGE): virbr1: link becomes ready [ 716.846912] BUG: soft lockup - CPU#1 stuck for 22s! [qemu-system-x86:911] [ 716.854611] Modules linked in: ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack xt_CHECKSUM iptable_mangle tun bridge stp llc ip6table_filter ip6_tables ebtable_nat ebtables x86_pkg_temp_thermal coretemp kvm_intel snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi kvm snd_hda_intel snd_hda_codec snd_hwdep snd_seq i2c_i801 iwlwifi crct10dif_pclmul crc32_pclmul crc32c_intel snd_seq_device cfg80211 ghash_clmulni_intel ppdev snd_pcm microcode iTCO_wdt iTCO_vendor_support serio_raw winbond_cir rfkill snd_timer rc_core parport_pc sdhci_acpi snd parport e1000e ptp sdhci mmc_core nfsd auth_rpcgss i2c_hid nfs_acl lockd dw_dmac i2c_designware_platform dw_dmac_core i2c_designware_core shpchp pps_core soundcore sunrpc mei_me mei lpc_ich mfd_core i915 i2c_algo_bit drm_kms_helper drm i2c_core video usb_storage [ 716.941989] irq event stamp: 138600858 [ 716.946229] hardirqs last enabled at (138600857): [<ffffffffa05395d3>] kvm_arch_vcpu_ioctl_run+0x363/0x1510 [kvm] [ 716.957970] hardirqs last disabled at (138600858): [<ffffffff817a7c2d>] apic_timer_interrupt+0x6d/0x80 [ 716.968523] softirqs last enabled at (138595310): [<ffffffff810991ce>] __do_softirq+0x1ce/0x460 [ 716.978493] softirqs last disabled at (138595305): [<ffffffff81099795>] irq_exit+0xc5/0xd0 [ 716.987865] CPU: 1 PID: 911 Comm: qemu-system-x86 Not tainted 3.14.0-0.rc0.git9.1.fc21.x86_64 #1 [ 716.997812] Hardware name: Intel Corporation Shark Bay Client platform/Flathead Creek Crb, BIOS HSWLPTU1.86C.0109.R03.1301282055 01/28/2013 [ 717.011991] task: ffff880446ad1ab0 ti: ffff88042cedc000 task.ti: ffff88042cedc000 [ 717.020463] RIP: 0010:[<ffffffff810f4782>] [<ffffffff810f4782>] lock_release+0xc2/0x310 [ 717.029635] RSP: 0018:ffff88042ceddd38 EFLAGS: 00000246 [ 717.035647] RAX: ffff880446ad1ab0 RBX: 0000000000a74000 RCX: 0000000000009a60 [ 717.043726] RDX: ffff8800a18523c0 RSI: 0000000000000000 RDI: 0000000000000246 [ 717.051812] RBP: ffff88042ceddd60 R08: ffff880446ad2610 R09: 0000000000000000 [ 717.059890] R10: 0000000000000001 R11: 0000000000000000 R12: ffff880446ad2610 [ 717.067968] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 [ 717.076047] FS: 00007f6abfacd700(0000) GS:ffff8800a1800000(0000) knlGS:0000000000000000 [ 717.085209] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 717.091713] CR2: 0000000000000000 CR3: 000000042eb48000 CR4: 00000000001427e0 [ 717.099793] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 717.107870] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 717.115948] Stack: [ 717.118221] ffff88042cee0000 0000000000000001 0000000000000000 ffff88042cebc280 [ 717.126632] ffff88042cebc100 ffff88042cedde38 ffffffffa053a436 ffffffffa05395c7 [ 717.135054] ffff88042cee0048 ffff88042ceddd90 ffff880446ad1ab0 ffff880446ad1ab0 [ 717.143468] Call Trace: [ 717.146239] [<ffffffffa053a436>] kvm_arch_vcpu_ioctl_run+0x11c6/0x1510 [kvm] [ 717.154314] [<ffffffffa05395c7>] ? kvm_arch_vcpu_ioctl_run+0x357/0x1510 [kvm] [ 717.162487] [<ffffffffa052067c>] ? vcpu_load+0x1c/0xa0 [kvm] [ 717.168995] [<ffffffffa05358fe>] ? kvm_arch_vcpu_load+0x4e/0x1e0 [kvm] [ 717.176487] [<ffffffffa05209fd>] kvm_vcpu_ioctl+0x2bd/0x670 [kvm] [ 717.183486] [<ffffffff810c4ee2>] ? creds_are_invalid.part.1+0x12/0x50 [ 717.190876] [<ffffffff810c4f41>] ? creds_are_invalid+0x21/0x30 [ 717.197580] [<ffffffff813415c6>] ? inode_has_perm.isra.51+0x26/0x80 [ 717.204775] [<ffffffff81237b70>] do_vfs_ioctl+0x300/0x520 [ 717.210986] [<ffffffff81341c2b>] ? selinux_file_ioctl+0x5b/0x110 [ 717.217884] [<ffffffff81237e11>] SyS_ioctl+0x81/0xa0 [ 717.223601] [<ffffffff817a6f29>] system_call_fastpath+0x16/0x1b [ 717.230399] Code: 85 8c 00 00 00 4c 89 ea 4c 89 e6 48 89 df e8 06 fc ff ff 65 48 8b 04 25 80 c9 00 00 4c 89 f7 c7 80 24 0b 00 00 00 00 00 00 57 9d <0f> 1f 44 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d f3 c3 0f 1f 44 00 [ 744.830791] BUG: soft lockup - CPU#1 stuck for 22s! [qemu-system-x86:911] [ 744.838481] Modules linked in: ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack xt_CHECKSUM iptable_mangle tun bridge stp llc ip6table_filter ip6_tables ebtable_nat ebtables x86_pkg_temp_thermal coretemp kvm_intel snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi kvm snd_hda_intel snd_hda_codec snd_hwdep snd_seq i2c_i801 iwlwifi crct10dif_pclmul crc32_pclmul crc32c_intel snd_seq_device cfg80211 ghash_clmulni_intel ppdev snd_pcm microcode iTCO_wdt iTCO_vendor_support serio_raw winbond_cir rfkill snd_timer rc_core parport_pc sdhci_acpi snd parport e1000e ptp sdhci mmc_core nfsd auth_rpcgss i2c_hid nfs_acl lockd dw_dmac i2c_designware_platform dw_dmac_core i2c_designware_core shpchp pps_core soundcore sunrpc mei_me mei lpc_ich mfd_core i915 i2c_algo_bit drm_kms_helper drm i2c_core video usb_storage [ 744.925877] irq event stamp: 290621582 [ 744.930118] hardirqs last enabled at (290621581): [<ffffffffa05395d3>] kvm_arch_vcpu_ioctl_run+0x363/0x1510 [kvm] [ 744.941856] hardirqs last disabled at (290621582): [<ffffffff817a7c2d>] apic_timer_interrupt+0x6d/0x80 [ 744.952405] softirqs last enabled at (290616188): [<ffffffff810991ce>] __do_softirq+0x1ce/0x460 [ 744.962372] softirqs last disabled at (290616183): [<ffffffff81099795>] irq_exit+0xc5/0xd0 [ 744.971742] CPU: 1 PID: 911 Comm: qemu-system-x86 Not tainted 3.14.0-0.rc0.git9.1.fc21.x86_64 #1 [ 744.981691] Hardware name: Intel Corporation Shark Bay Client platform/Flathead Creek Crb, BIOS HSWLPTU1.86C.0109.R03.1301282055 01/28/2013 [ 744.995868] task: ffff880446ad1ab0 ti: ffff88042cedc000 task.ti: ffff88042cedc000 [ 745.004341] RIP: 0010:[<ffffffff810f4782>] [<ffffffff810f4782>] lock_release+0xc2/0x310 [ 745.013514] RSP: 0018:ffff88042ceddd38 EFLAGS: 00000246 [ 745.019527] RAX: ffff880446ad1ab0 RBX: 0000000000000001 RCX: 0000000000009a60 [ 745.027605] RDX: ffff8800a18523c0 RSI: 0000000000000000 RDI: 0000000000000246 [ 745.035693] RBP: ffff88042ceddd60 R08: ffff880446ad2610 R09: 0000000000000000 [ 745.043773] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001 [ 745.051852] R13: 0000000000000000 R14: ffffffff813b9ceb R15: ffff88042ceddd60 [ 745.059930] FS: 00007f6abfacd700(0000) GS:ffff8800a1800000(0000) knlGS:0000000000000000 [ 745.069092] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 745.075594] CR2: 0000000000000000 CR3: 000000042eb48000 CR4: 00000000001427e0 [ 745.083672] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 745.091751] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 745.099830] Stack: [ 745.102102] ffff88042cee0000 0000000000000001 0000000000000000 ffff88042cebc280 [ 745.110512] ffff88042cebc100 ffff88042cedde38 ffffffffa053a436 ffffffffa05395c7 [ 745.118934] ffff88042cee0048 ffff88042ceddd90 ffff880446ad1ab0 ffff880446ad1ab0 [ 745.127345] Call Trace: [ 745.130116] [<ffffffffa053a436>] kvm_arch_vcpu_ioctl_run+0x11c6/0x1510 [kvm] [ 745.138190] [<ffffffffa05395c7>] ? kvm_arch_vcpu_ioctl_run+0x357/0x1510 [kvm] [ 745.146372] [<ffffffffa052067c>] ? vcpu_load+0x1c/0xa0 [kvm] [ 745.152872] [<ffffffffa05358fe>] ? kvm_arch_vcpu_load+0x4e/0x1e0 [kvm] [ 745.160363] [<ffffffffa05209fd>] kvm_vcpu_ioctl+0x2bd/0x670 [kvm] [ 745.167361] [<ffffffff810c4ee2>] ? creds_are_invalid.part.1+0x12/0x50 [ 745.174752] [<ffffffff810c4f41>] ? creds_are_invalid+0x21/0x30 [ 745.181456] [<ffffffff813415c6>] ? inode_has_perm.isra.51+0x26/0x80 [ 745.188649] [<ffffffff81237b70>] do_vfs_ioctl+0x300/0x520 [ 745.194861] [<ffffffff81341c2b>] ? selinux_file_ioctl+0x5b/0x110 [ 745.201758] [<ffffffff81237e11>] SyS_ioctl+0x81/0xa0 [ 745.207475] [<ffffffff817a6f29>] system_call_fastpath+0x16/0x1b [ 745.214274] Code: 85 8c 00 00 00 4c 89 ea 4c 89 e6 48 89 df e8 06 fc ff ff 65 48 8b 04 25 80 c9 00 00 4c 89 f7 c7 80 24 0b 00 00 00 00 00 00 57 9d <0f> 1f 44 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d f3 c3 0f 1f 44 00 [ 757.911256] INFO: rcu_sched self-detected stall on CPU { 1} (t=65000 jiffies g=4088 c=4087 q=343) [ 757.921471] sending NMI to all CPUs: [ 757.925516] NMI backtrace for cpu 1 [ 757.929474] CPU: 1 PID: 911 Comm: qemu-system-x86 Not tainted 3.14.0-0.rc0.git9.1.fc21.x86_64 #1 [ 757.939423] Hardware name: Intel Corporation Shark Bay Client platform/Flathead Creek Crb, BIOS HSWLPTU1.86C.0109.R03.1301282055 01/28/2013 [ 757.953600] task: ffff880446ad1ab0 ti: ffff88042cedc000 task.ti: ffff88042cedc000 [ 757.962073] RIP: 0010:[<ffffffff810ee310>] [<ffffffff810ee310>] trace_hardirqs_off+0x0/0x10 [ 757.971640] RSP: 0018:ffff8800a1803d88 EFLAGS: 00000086 [ 757.977651] RAX: 0000000000000008 RBX: 0000000000000055 RCX: 0000000000000038 [ 757.985730] RDX: 00000000000000ff RSI: 0000000000000008 RDI: 0000000000000086 [ 757.993809] RBP: ffff8800a1803de0 R08: ffff880448202f88 R09: 0000000000000001 [ 758.001889] R10: 0000000000000000 R11: ffff8800a1803b36 R12: ffff880448202f88 [ 758.009968] R13: ffff8804487ebf60 R14: 000000000000e0c0 R15: 0000000000080000 [ 758.018046] FS: 00007f6abfacd700(0000) GS:ffff8800a1800000(0000) knlGS:0000000000000000 [ 758.027207] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 758.033713] CR2: 0000000000000000 CR3: 000000042eb48000 CR4: 00000000001427e0 [ 758.041792] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 758.049869] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 758.057948] Stack: [ 758.060221] ffffffff8105385b 0000000000000086 00000002a1803df0 000000000000e0b8 [ 758.068633] 0000000800000001 0000000000000001 0000000000002710 ffffffff81c7a6c0 [ 758.077044] ffffffff81d83720 ffffffff81c7a6c0 0000000000000001 ffff8800a1803df0 [ 758.085458] Call Trace: [ 758.088224] <IRQ> [ 758.090398] [<ffffffff8105385b>] ? __x2apic_send_IPI_mask+0x1ab/0x1c0 [ 758.098008] [<ffffffff8105388c>] x2apic_send_IPI_all+0x1c/0x20 [ 758.104709] [<ffffffff8104ee44>] arch_trigger_all_cpu_backtrace+0x64/0xa0 [ 758.112494] [<ffffffff81111424>] rcu_check_callbacks+0x584/0x850 [ 758.119392] [<ffffffff810a3a77>] update_process_times+0x47/0x70 [ 758.126193] [<ffffffff8111ce95>] tick_sched_handle.isra.19+0x25/0x60 [ 758.133484] [<ffffffff8111d681>] tick_sched_timer+0x41/0x60 [ 758.139891] [<ffffffff810c21a6>] __run_hrtimer+0x86/0x440 [ 758.146099] [<ffffffff8111d640>] ? tick_sched_do_timer+0x40/0x40 [ 758.152997] [<ffffffff810c2fa7>] hrtimer_interrupt+0xf7/0x240 [ 758.159601] [<ffffffff8104ce17>] local_apic_timer_interrupt+0x37/0x60 [ 758.166991] [<ffffffff817a92ef>] smp_apic_timer_interrupt+0x3f/0x60 [ 758.174184] [<ffffffff817a7c32>] apic_timer_interrupt+0x72/0x80 [ 758.180983] <EOI> [ 758.183157] [<ffffffff810f425a>] ? lock_acquire+0xba/0x1d0 [ 758.189689] [<ffffffffa053a41a>] ? kvm_arch_vcpu_ioctl_run+0x11aa/0x1510 [kvm] [ 758.197969] [<ffffffffa053a486>] kvm_arch_vcpu_ioctl_run+0x1216/0x1510 [kvm] [ 758.206053] [<ffffffffa053a41a>] ? kvm_arch_vcpu_ioctl_run+0x11aa/0x1510 [kvm] [ 758.214323] [<ffffffffa052067c>] ? vcpu_load+0x1c/0xa0 [kvm] [ 758.220832] [<ffffffffa05358fe>] ? kvm_arch_vcpu_load+0x4e/0x1e0 [kvm] [ 758.228323] [<ffffffffa05209fd>] kvm_vcpu_ioctl+0x2bd/0x670 [kvm] [ 758.235319] [<ffffffff810c4ee2>] ? creds_are_invalid.part.1+0x12/0x50 [ 758.242711] [<ffffffff810c4f41>] ? creds_are_invalid+0x21/0x30 [ 758.249412] [<ffffffff813415c6>] ? inode_has_perm.isra.51+0x26/0x80 [ 758.256606] [<ffffffff81237b70>] do_vfs_ioctl+0x300/0x520 [ 758.262818] [<ffffffff81341c2b>] ? selinux_file_ioctl+0x5b/0x110 [ 758.269715] [<ffffffff81237e11>] SyS_ioctl+0x81/0xa0 [ 758.275434] [<ffffffff817a6f29>] system_call_fastpath+0x16/0x1b [ 758.282233] Code: 0f 1f 00 f3 c3 48 c7 c1 82 a7 a4 81 48 c7 c2 4d 64 a4 81 be 42 0a 00 00 48 c7 c7 53 a7 a4 81 31 c0 e8 45 44 fa ff 5d eb d5 66 90 <55> 48 89 e5 48 8b 7d 08 e8 43 ff ff ff 5d c3 90 55 48 81 ff 00 [ 758.304183] INFO: NMI handler (arch_trigger_all_cpu_backtrace_handler) took too long to run: 378.664 msecs [ 758.304185] NMI backtrace for cpu 3 [ 758.304186] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 3.14.0-0.rc0.git9.1.fc21.x86_64 #1 [ 758.304187] Hardware name: Intel Corporation Shark Bay Client platform/Flathead Creek Crb, BIOS HSWLPTU1.86C.0109.R03.1301282055 01/28/2013 [ 758.304188] task: ffff880448268000 ti: ffff880448264000 task.ti: ffff880448264000 [ 758.304191] RIP: 0010:[<ffffffff814278ff>] [<ffffffff814278ff>] intel_idle+0xdf/0x160 [ 758.304191] RSP: 0018:ffff880448265e30 EFLAGS: 00000046 [ 758.304192] RAX: 0000000000000032 RBX: 0000000000000010 RCX: 0000000000000001 [ 758.304192] RDX: 0000000000000000 RSI: ffffffff81cfd560 RDI: 0000000000000003 [ 758.304193] RBP: ffff880448265e58 R08: 00000000006f9072 R09: ffffffffffffffff [ 758.304193] R10: 000001ced94d755f R11: 0000000225c17d03 R12: 0000000000000005 [ 758.304194] R13: 0000000000000032 R14: 0000000000000004 R15: ffffffff81cfd730 [ 758.304195] FS: 0000000000000000(0000) GS:ffff8800a1c00000(0000) knlGS:0000000000000000 [ 758.304195] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 758.304196] CR2: 00007f748f00d000 CR3: 0000000001c0c000 CR4: 00000000001427e0 [ 758.304196] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 758.304197] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 758.304197] Stack: [ 758.304198] 00000003815fde00 ffffe8ffff400680 ffffffff81cfd560 0000000000000005 [ 758.304200] 000000b04d0e578d ffff880448265e90 ffffffff815fde10 ffff880448265fd8 [ 758.304201] ffffe8ffff400680 0000000000000005 0000000000000003 ffffffff81cfd560 [ 758.304201] Call Trace: [ 758.304205] [<ffffffff815fde10>] cpuidle_enter_state+0x40/0xd0 [ 758.304206] [<ffffffff815fdf59>] cpuidle_idle_call+0xb9/0x380 [ 758.304209] [<ffffffff81024c8e>] arch_cpu_idle+0xe/0x40 [ 758.304212] [<ffffffff81105d0e>] cpu_startup_entry+0x9e/0x3d0 [ 758.304214] [<ffffffff8104ae29>] start_secondary+0x1e9/0x290 [ 758.304226] Code: c9 00 00 48 89 d1 48 2d c8 1f 00 00 0f 01 c8 65 48 8b 04 25 70 c9 00 00 48 8b 80 38 e0 ff ff a8 08 75 08 b1 01 4c 89 e8 0f 01 c9 <65> 48 8b 04 25 70 c9 00 00 83 a0 3c e0 ff ff fb 0f ae f0 85 1d [ 758.304227] NMI backtrace for cpu 0 . . . ==== Expected results ---------------- Successful boot w/o soft lockups, and crashes
Created attachment 123501 [details] Complete stdout of dmesg
Created attachment 123511 [details] Complete stdout of dmidecode
Created attachment 123541 [details] Complete stdout of `x86info -a`
Downstream bug -- https://bugzilla.redhat.com/show_bug.cgi?id=1058209
We suspect it is caused by same root cause with 69361 https://bugzilla.kernel.org/show_bug.cgi?id=69361 We apply the same patch and test on a Haswell machine, don't have such call trace and boot up successfully. Please have a try on the patch in your environment.
Created attachment 125521 [details] Successful stderr of `dmesg` on L0 with Kernel 3.14.0-0.rc1.git4.1.fc21.x86_64 I just tested with this Kernel 3.14.0-0.rc1.git4.1.fc21.x86_64 my bare-metal, booted L1 (running: 3.14.0-0.rc1.git4.1.fc21.x86_64) and L2 ( running 3.11.10-301.fc20.x86_64') Couple of observations ---------------------- - I don't see the soft lockups any more on host - L2 is just stuck on: Booting `Fedora, with Linux 3.11.10-301.fc20.x86_64' when booted over a serial console. I tried booting into single level, it's just stuck there, attempting to "Booting a command list" - To isolate the problem Kernel, I also tried: - Shutdown L2; Booting L1 into 3.14.0-0.rc1.git1.1.fc21.x86_64; Start L2 with 3.11.10-301.fc20.x86_64 -- stuck on boot. Repeated the above test with booting L1 into 3.12.8-300.fc20.x86_64, and starting L2 results -- stuck on boot. So, from the above symptoms, I'm inferring the problem appears to be with current L0 Kernel (3.14.0-0.rc1.git4.1). Because booting it into its older Kernel (kernel-3.12.8-300.fc20.x86_64), brings up L2 successfully I'm yet to investigate further here.
(In reply to Kashyap Chamarthy from comment #6) [. . .] > > I just tested with this Kernel 3.14.0-0.rc1.git4.1.fc21.x86_64 my bare-metal, > booted L1 (running: 3.14.0-0.rc1.git4.1.fc21.x86_64) and L2 ( running > 3.11.10-301.fc20.x86_64') > > Couple of observations > ---------------------- > > - I don't see the soft lockups any more on host > - L2 is just stuck on: > > Booting `Fedora, with Linux 3.11.10-301.fc20.x86_64' > > when booted over a serial console. I tried booting into single > level, it's just stuck there, attempting to "Booting a command list" I still see this same problem with this Kernel on L0 and L1: 3.14.0-0.rc3.git2.1.fc21.x86_64
This is now fixed with this[1] patch from Paolo. Test result[2]. [1] https://patchwork.kernel.org/patch/3736391/ [2] http://article.gmane.org/gmane.comp.emulators.kvm.devel/119406