[Group.of.nepali.translators] [Bug 1596941] Re: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive)
[Expired for linux (Ubuntu Yakkety) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu Yakkety) Status: Incomplete => Expired -- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1596941 Title: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive) Status in linux package in Ubuntu: Expired Status in linux source package in Trusty: Expired Status in linux source package in Vivid: Expired Status in linux source package in Wily: Expired Status in linux source package in Xenial: Expired Status in linux source package in Yakkety: Expired Bug description: It was brought to my knowledge that qemu-kvm live migration (with full storage copy) on Trusty + Mitaka Ubuntu Cloud Archive was broken. When investigating I stepped into the following situation: crash> sys KERNEL: /usr/lib/debug/boot/vmlinux-3.13.0-86-generic DUMPFILE: ./201606241546/dump.201606241546 [PARTIAL DUMP] CPUS: 4 DATE: Fri Jun 24 15:46:39 2016 UPTIME: 00:06:00 LOAD AVERAGE: 1.00, 0.60, 0.26 TASKS: 146 NODENAME: vmqemulivefail1 RELEASE: 3.13.0-86-generic VERSION: #131-Ubuntu SMP Thu May 12 23:33:13 UTC 2016 MACHINE: x86_64 (2494 Mhz) MEMORY: 8 GB PANIC: "Kernel panic - not syncing: hung_task: blocked tasks" Full backtrace doesn't have anything useful since i've configured kernel.softlockup_panic. From scheduled-out tasks (and from kern.log) I was able to see that in more than one occasion I had the qemu process possibly dead-locked when dealing with asynchronous page faults: ## kernel 3.13 # dump 1 PID: 1604 TASK: 8800374be000 CPU: 3 COMMAND: "qemu-system-x86" #0 [8800ba115e28] __schedule at 8172e379 #1 [8800ba115e90] schedule at 8172e859 #2 [8800ba115ea0] kvm_async_pf_task_wait at 8105060f #3 [8800ba115f38] do_async_page_fault at 81736090 #4 [8800ba115f50] async_page_fault at 81732cd8 RIP: 7fb4eff0a4b3 RSP: 7fb4713facb0 RFLAGS: 00010206 RAX: 7fb4cb9cf000 RBX: 7fb4f166d8f0 RCX: 0010 RDX: 1fff RSI: 7fb4cb9deff8 RDI: 4000 RBP: R8: R9: 0002601b R10: 00fffe00 R11: 1fff R12: 0008 R13: 7fb4713fad84 R14: 7fb4f1665290 R15: 7fb4713fad88 ORIG_RAX: CS: 0033 SS: 002b # dump 2 PID: 1735 TASK: 8800b9bcb000 CPU: 2 COMMAND: "qemu-system-x86" #0 [8802333c9e28] __schedule at 8172e379 #1 [8802333c9e90] schedule at 8172e859 #2 [8802333c9ea0] kvm_async_pf_task_wait at 8105060f #3 [8802333c9f38] do_async_page_fault at 81736090 #4 [8802333c9f50] async_page_fault at 81732cd8 RIP: 7f631399d3b0 RSP: 7f62912c7990 RFLAGS: 00010206 RAX: RBX: 7f6315f9e370 RCX: 7f62ca714000 RDX: 32914020 RSI: 1000 RDI: 7f62ca714000 RBP: 7f6315c66e40 R8: 7f62912c7a40 R9: 7f6315f9e3e0 R10: R11: 32914020 R12: 32914020 R13: 00032914 R14: R15: ORIG_RAX: CS: 0033 SS: 002b # dump 3 PID: 1617 TASK: 880232834800 CPU: 3 COMMAND: "qemu-system-x86" #0 [880232a6de28] __schedule at 8172e379 #1 [880232a6de90] schedule at 8172e859 #2 [880232a6dea0] kvm_async_pf_task_wait at 8105060f #3 [880232a6df38] do_async_page_fault at 81736090 #4 [880232a6df50] async_page_fault at 81732cd8 RIP: 7f8c39e8b3b0 RSP: 7f8bb80c9990 RFLAGS: 00010206 RAX: RBX: 7f8c3aeba370 RCX: 7f8bdea18000 RDX: 22c18020 RSI: 1000 RDI: 7f8bdea18000 RBP: 7f8c3ab82e40 R8: 7f8bb80c9a40 R9: 7f8c3aeba498 R10: R11: 22c18020 R12: 22c18020 R13: 00022c18 R14: R15: ORIG_RAX: CS: 0033 SS: 002b ## kernel 4.4 # kern.log 544 [ 360.282132] INFO: task qemu-system-x86:1592 blocked for more than 120 seconds. 545 [ 360.282984] Not tainted 4.4.0-27-generic #46~14.04.1-Ubuntu 546 [ 360.283581] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 547 [ 360.284439] qemu-system-x86 D 8800bb833e90 0 1592 1 0x 548 [ 360.284443] 8800bb833e90 88023151c4c0 8802345eb700 8800bb834000 549 [ 360.28]
[Group.of.nepali.translators] [Bug 1596941] Re: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive)
[Expired for linux (Ubuntu Vivid) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu Vivid) Status: Incomplete => Expired -- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1596941 Title: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive) Status in linux package in Ubuntu: Expired Status in linux source package in Trusty: Expired Status in linux source package in Vivid: Expired Status in linux source package in Wily: Expired Status in linux source package in Xenial: Expired Status in linux source package in Yakkety: Expired Bug description: It was brought to my knowledge that qemu-kvm live migration (with full storage copy) on Trusty + Mitaka Ubuntu Cloud Archive was broken. When investigating I stepped into the following situation: crash> sys KERNEL: /usr/lib/debug/boot/vmlinux-3.13.0-86-generic DUMPFILE: ./201606241546/dump.201606241546 [PARTIAL DUMP] CPUS: 4 DATE: Fri Jun 24 15:46:39 2016 UPTIME: 00:06:00 LOAD AVERAGE: 1.00, 0.60, 0.26 TASKS: 146 NODENAME: vmqemulivefail1 RELEASE: 3.13.0-86-generic VERSION: #131-Ubuntu SMP Thu May 12 23:33:13 UTC 2016 MACHINE: x86_64 (2494 Mhz) MEMORY: 8 GB PANIC: "Kernel panic - not syncing: hung_task: blocked tasks" Full backtrace doesn't have anything useful since i've configured kernel.softlockup_panic. From scheduled-out tasks (and from kern.log) I was able to see that in more than one occasion I had the qemu process possibly dead-locked when dealing with asynchronous page faults: ## kernel 3.13 # dump 1 PID: 1604 TASK: 8800374be000 CPU: 3 COMMAND: "qemu-system-x86" #0 [8800ba115e28] __schedule at 8172e379 #1 [8800ba115e90] schedule at 8172e859 #2 [8800ba115ea0] kvm_async_pf_task_wait at 8105060f #3 [8800ba115f38] do_async_page_fault at 81736090 #4 [8800ba115f50] async_page_fault at 81732cd8 RIP: 7fb4eff0a4b3 RSP: 7fb4713facb0 RFLAGS: 00010206 RAX: 7fb4cb9cf000 RBX: 7fb4f166d8f0 RCX: 0010 RDX: 1fff RSI: 7fb4cb9deff8 RDI: 4000 RBP: R8: R9: 0002601b R10: 00fffe00 R11: 1fff R12: 0008 R13: 7fb4713fad84 R14: 7fb4f1665290 R15: 7fb4713fad88 ORIG_RAX: CS: 0033 SS: 002b # dump 2 PID: 1735 TASK: 8800b9bcb000 CPU: 2 COMMAND: "qemu-system-x86" #0 [8802333c9e28] __schedule at 8172e379 #1 [8802333c9e90] schedule at 8172e859 #2 [8802333c9ea0] kvm_async_pf_task_wait at 8105060f #3 [8802333c9f38] do_async_page_fault at 81736090 #4 [8802333c9f50] async_page_fault at 81732cd8 RIP: 7f631399d3b0 RSP: 7f62912c7990 RFLAGS: 00010206 RAX: RBX: 7f6315f9e370 RCX: 7f62ca714000 RDX: 32914020 RSI: 1000 RDI: 7f62ca714000 RBP: 7f6315c66e40 R8: 7f62912c7a40 R9: 7f6315f9e3e0 R10: R11: 32914020 R12: 32914020 R13: 00032914 R14: R15: ORIG_RAX: CS: 0033 SS: 002b # dump 3 PID: 1617 TASK: 880232834800 CPU: 3 COMMAND: "qemu-system-x86" #0 [880232a6de28] __schedule at 8172e379 #1 [880232a6de90] schedule at 8172e859 #2 [880232a6dea0] kvm_async_pf_task_wait at 8105060f #3 [880232a6df38] do_async_page_fault at 81736090 #4 [880232a6df50] async_page_fault at 81732cd8 RIP: 7f8c39e8b3b0 RSP: 7f8bb80c9990 RFLAGS: 00010206 RAX: RBX: 7f8c3aeba370 RCX: 7f8bdea18000 RDX: 22c18020 RSI: 1000 RDI: 7f8bdea18000 RBP: 7f8c3ab82e40 R8: 7f8bb80c9a40 R9: 7f8c3aeba498 R10: R11: 22c18020 R12: 22c18020 R13: 00022c18 R14: R15: ORIG_RAX: CS: 0033 SS: 002b ## kernel 4.4 # kern.log 544 [ 360.282132] INFO: task qemu-system-x86:1592 blocked for more than 120 seconds. 545 [ 360.282984] Not tainted 4.4.0-27-generic #46~14.04.1-Ubuntu 546 [ 360.283581] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 547 [ 360.284439] qemu-system-x86 D 8800bb833e90 0 1592 1 0x 548 [ 360.284443] 8800bb833e90 88023151c4c0 8802345eb700 8800bb834000 549 [ 360.28]
[Group.of.nepali.translators] [Bug 1596941] Re: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive)
[Expired for linux (Ubuntu Wily) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu Wily) Status: Incomplete => Expired -- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1596941 Title: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive) Status in linux package in Ubuntu: Expired Status in linux source package in Trusty: Expired Status in linux source package in Vivid: Expired Status in linux source package in Wily: Expired Status in linux source package in Xenial: Expired Status in linux source package in Yakkety: Expired Bug description: It was brought to my knowledge that qemu-kvm live migration (with full storage copy) on Trusty + Mitaka Ubuntu Cloud Archive was broken. When investigating I stepped into the following situation: crash> sys KERNEL: /usr/lib/debug/boot/vmlinux-3.13.0-86-generic DUMPFILE: ./201606241546/dump.201606241546 [PARTIAL DUMP] CPUS: 4 DATE: Fri Jun 24 15:46:39 2016 UPTIME: 00:06:00 LOAD AVERAGE: 1.00, 0.60, 0.26 TASKS: 146 NODENAME: vmqemulivefail1 RELEASE: 3.13.0-86-generic VERSION: #131-Ubuntu SMP Thu May 12 23:33:13 UTC 2016 MACHINE: x86_64 (2494 Mhz) MEMORY: 8 GB PANIC: "Kernel panic - not syncing: hung_task: blocked tasks" Full backtrace doesn't have anything useful since i've configured kernel.softlockup_panic. From scheduled-out tasks (and from kern.log) I was able to see that in more than one occasion I had the qemu process possibly dead-locked when dealing with asynchronous page faults: ## kernel 3.13 # dump 1 PID: 1604 TASK: 8800374be000 CPU: 3 COMMAND: "qemu-system-x86" #0 [8800ba115e28] __schedule at 8172e379 #1 [8800ba115e90] schedule at 8172e859 #2 [8800ba115ea0] kvm_async_pf_task_wait at 8105060f #3 [8800ba115f38] do_async_page_fault at 81736090 #4 [8800ba115f50] async_page_fault at 81732cd8 RIP: 7fb4eff0a4b3 RSP: 7fb4713facb0 RFLAGS: 00010206 RAX: 7fb4cb9cf000 RBX: 7fb4f166d8f0 RCX: 0010 RDX: 1fff RSI: 7fb4cb9deff8 RDI: 4000 RBP: R8: R9: 0002601b R10: 00fffe00 R11: 1fff R12: 0008 R13: 7fb4713fad84 R14: 7fb4f1665290 R15: 7fb4713fad88 ORIG_RAX: CS: 0033 SS: 002b # dump 2 PID: 1735 TASK: 8800b9bcb000 CPU: 2 COMMAND: "qemu-system-x86" #0 [8802333c9e28] __schedule at 8172e379 #1 [8802333c9e90] schedule at 8172e859 #2 [8802333c9ea0] kvm_async_pf_task_wait at 8105060f #3 [8802333c9f38] do_async_page_fault at 81736090 #4 [8802333c9f50] async_page_fault at 81732cd8 RIP: 7f631399d3b0 RSP: 7f62912c7990 RFLAGS: 00010206 RAX: RBX: 7f6315f9e370 RCX: 7f62ca714000 RDX: 32914020 RSI: 1000 RDI: 7f62ca714000 RBP: 7f6315c66e40 R8: 7f62912c7a40 R9: 7f6315f9e3e0 R10: R11: 32914020 R12: 32914020 R13: 00032914 R14: R15: ORIG_RAX: CS: 0033 SS: 002b # dump 3 PID: 1617 TASK: 880232834800 CPU: 3 COMMAND: "qemu-system-x86" #0 [880232a6de28] __schedule at 8172e379 #1 [880232a6de90] schedule at 8172e859 #2 [880232a6dea0] kvm_async_pf_task_wait at 8105060f #3 [880232a6df38] do_async_page_fault at 81736090 #4 [880232a6df50] async_page_fault at 81732cd8 RIP: 7f8c39e8b3b0 RSP: 7f8bb80c9990 RFLAGS: 00010206 RAX: RBX: 7f8c3aeba370 RCX: 7f8bdea18000 RDX: 22c18020 RSI: 1000 RDI: 7f8bdea18000 RBP: 7f8c3ab82e40 R8: 7f8bb80c9a40 R9: 7f8c3aeba498 R10: R11: 22c18020 R12: 22c18020 R13: 00022c18 R14: R15: ORIG_RAX: CS: 0033 SS: 002b ## kernel 4.4 # kern.log 544 [ 360.282132] INFO: task qemu-system-x86:1592 blocked for more than 120 seconds. 545 [ 360.282984] Not tainted 4.4.0-27-generic #46~14.04.1-Ubuntu 546 [ 360.283581] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 547 [ 360.284439] qemu-system-x86 D 8800bb833e90 0 1592 1 0x 548 [ 360.284443] 8800bb833e90 88023151c4c0 8802345eb700 8800bb834000 549 [ 360.28]
[Group.of.nepali.translators] [Bug 1596941] Re: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive)
[Expired for linux (Ubuntu Xenial) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu Xenial) Status: Incomplete => Expired -- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1596941 Title: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive) Status in linux package in Ubuntu: Expired Status in linux source package in Trusty: Expired Status in linux source package in Vivid: Expired Status in linux source package in Wily: Expired Status in linux source package in Xenial: Expired Status in linux source package in Yakkety: Expired Bug description: It was brought to my knowledge that qemu-kvm live migration (with full storage copy) on Trusty + Mitaka Ubuntu Cloud Archive was broken. When investigating I stepped into the following situation: crash> sys KERNEL: /usr/lib/debug/boot/vmlinux-3.13.0-86-generic DUMPFILE: ./201606241546/dump.201606241546 [PARTIAL DUMP] CPUS: 4 DATE: Fri Jun 24 15:46:39 2016 UPTIME: 00:06:00 LOAD AVERAGE: 1.00, 0.60, 0.26 TASKS: 146 NODENAME: vmqemulivefail1 RELEASE: 3.13.0-86-generic VERSION: #131-Ubuntu SMP Thu May 12 23:33:13 UTC 2016 MACHINE: x86_64 (2494 Mhz) MEMORY: 8 GB PANIC: "Kernel panic - not syncing: hung_task: blocked tasks" Full backtrace doesn't have anything useful since i've configured kernel.softlockup_panic. From scheduled-out tasks (and from kern.log) I was able to see that in more than one occasion I had the qemu process possibly dead-locked when dealing with asynchronous page faults: ## kernel 3.13 # dump 1 PID: 1604 TASK: 8800374be000 CPU: 3 COMMAND: "qemu-system-x86" #0 [8800ba115e28] __schedule at 8172e379 #1 [8800ba115e90] schedule at 8172e859 #2 [8800ba115ea0] kvm_async_pf_task_wait at 8105060f #3 [8800ba115f38] do_async_page_fault at 81736090 #4 [8800ba115f50] async_page_fault at 81732cd8 RIP: 7fb4eff0a4b3 RSP: 7fb4713facb0 RFLAGS: 00010206 RAX: 7fb4cb9cf000 RBX: 7fb4f166d8f0 RCX: 0010 RDX: 1fff RSI: 7fb4cb9deff8 RDI: 4000 RBP: R8: R9: 0002601b R10: 00fffe00 R11: 1fff R12: 0008 R13: 7fb4713fad84 R14: 7fb4f1665290 R15: 7fb4713fad88 ORIG_RAX: CS: 0033 SS: 002b # dump 2 PID: 1735 TASK: 8800b9bcb000 CPU: 2 COMMAND: "qemu-system-x86" #0 [8802333c9e28] __schedule at 8172e379 #1 [8802333c9e90] schedule at 8172e859 #2 [8802333c9ea0] kvm_async_pf_task_wait at 8105060f #3 [8802333c9f38] do_async_page_fault at 81736090 #4 [8802333c9f50] async_page_fault at 81732cd8 RIP: 7f631399d3b0 RSP: 7f62912c7990 RFLAGS: 00010206 RAX: RBX: 7f6315f9e370 RCX: 7f62ca714000 RDX: 32914020 RSI: 1000 RDI: 7f62ca714000 RBP: 7f6315c66e40 R8: 7f62912c7a40 R9: 7f6315f9e3e0 R10: R11: 32914020 R12: 32914020 R13: 00032914 R14: R15: ORIG_RAX: CS: 0033 SS: 002b # dump 3 PID: 1617 TASK: 880232834800 CPU: 3 COMMAND: "qemu-system-x86" #0 [880232a6de28] __schedule at 8172e379 #1 [880232a6de90] schedule at 8172e859 #2 [880232a6dea0] kvm_async_pf_task_wait at 8105060f #3 [880232a6df38] do_async_page_fault at 81736090 #4 [880232a6df50] async_page_fault at 81732cd8 RIP: 7f8c39e8b3b0 RSP: 7f8bb80c9990 RFLAGS: 00010206 RAX: RBX: 7f8c3aeba370 RCX: 7f8bdea18000 RDX: 22c18020 RSI: 1000 RDI: 7f8bdea18000 RBP: 7f8c3ab82e40 R8: 7f8bb80c9a40 R9: 7f8c3aeba498 R10: R11: 22c18020 R12: 22c18020 R13: 00022c18 R14: R15: ORIG_RAX: CS: 0033 SS: 002b ## kernel 4.4 # kern.log 544 [ 360.282132] INFO: task qemu-system-x86:1592 blocked for more than 120 seconds. 545 [ 360.282984] Not tainted 4.4.0-27-generic #46~14.04.1-Ubuntu 546 [ 360.283581] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 547 [ 360.284439] qemu-system-x86 D 8800bb833e90 0 1592 1 0x 548 [ 360.284443] 8800bb833e90 88023151c4c0 8802345eb700 8800bb834000 549 [ 360.28]
[Group.of.nepali.translators] [Bug 1596941] Re: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive)
[Expired for linux (Ubuntu Trusty) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu Trusty) Status: Incomplete => Expired -- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1596941 Title: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive) Status in linux package in Ubuntu: Expired Status in linux source package in Trusty: Expired Status in linux source package in Vivid: Expired Status in linux source package in Wily: Expired Status in linux source package in Xenial: Expired Status in linux source package in Yakkety: Expired Bug description: It was brought to my knowledge that qemu-kvm live migration (with full storage copy) on Trusty + Mitaka Ubuntu Cloud Archive was broken. When investigating I stepped into the following situation: crash> sys KERNEL: /usr/lib/debug/boot/vmlinux-3.13.0-86-generic DUMPFILE: ./201606241546/dump.201606241546 [PARTIAL DUMP] CPUS: 4 DATE: Fri Jun 24 15:46:39 2016 UPTIME: 00:06:00 LOAD AVERAGE: 1.00, 0.60, 0.26 TASKS: 146 NODENAME: vmqemulivefail1 RELEASE: 3.13.0-86-generic VERSION: #131-Ubuntu SMP Thu May 12 23:33:13 UTC 2016 MACHINE: x86_64 (2494 Mhz) MEMORY: 8 GB PANIC: "Kernel panic - not syncing: hung_task: blocked tasks" Full backtrace doesn't have anything useful since i've configured kernel.softlockup_panic. From scheduled-out tasks (and from kern.log) I was able to see that in more than one occasion I had the qemu process possibly dead-locked when dealing with asynchronous page faults: ## kernel 3.13 # dump 1 PID: 1604 TASK: 8800374be000 CPU: 3 COMMAND: "qemu-system-x86" #0 [8800ba115e28] __schedule at 8172e379 #1 [8800ba115e90] schedule at 8172e859 #2 [8800ba115ea0] kvm_async_pf_task_wait at 8105060f #3 [8800ba115f38] do_async_page_fault at 81736090 #4 [8800ba115f50] async_page_fault at 81732cd8 RIP: 7fb4eff0a4b3 RSP: 7fb4713facb0 RFLAGS: 00010206 RAX: 7fb4cb9cf000 RBX: 7fb4f166d8f0 RCX: 0010 RDX: 1fff RSI: 7fb4cb9deff8 RDI: 4000 RBP: R8: R9: 0002601b R10: 00fffe00 R11: 1fff R12: 0008 R13: 7fb4713fad84 R14: 7fb4f1665290 R15: 7fb4713fad88 ORIG_RAX: CS: 0033 SS: 002b # dump 2 PID: 1735 TASK: 8800b9bcb000 CPU: 2 COMMAND: "qemu-system-x86" #0 [8802333c9e28] __schedule at 8172e379 #1 [8802333c9e90] schedule at 8172e859 #2 [8802333c9ea0] kvm_async_pf_task_wait at 8105060f #3 [8802333c9f38] do_async_page_fault at 81736090 #4 [8802333c9f50] async_page_fault at 81732cd8 RIP: 7f631399d3b0 RSP: 7f62912c7990 RFLAGS: 00010206 RAX: RBX: 7f6315f9e370 RCX: 7f62ca714000 RDX: 32914020 RSI: 1000 RDI: 7f62ca714000 RBP: 7f6315c66e40 R8: 7f62912c7a40 R9: 7f6315f9e3e0 R10: R11: 32914020 R12: 32914020 R13: 00032914 R14: R15: ORIG_RAX: CS: 0033 SS: 002b # dump 3 PID: 1617 TASK: 880232834800 CPU: 3 COMMAND: "qemu-system-x86" #0 [880232a6de28] __schedule at 8172e379 #1 [880232a6de90] schedule at 8172e859 #2 [880232a6dea0] kvm_async_pf_task_wait at 8105060f #3 [880232a6df38] do_async_page_fault at 81736090 #4 [880232a6df50] async_page_fault at 81732cd8 RIP: 7f8c39e8b3b0 RSP: 7f8bb80c9990 RFLAGS: 00010206 RAX: RBX: 7f8c3aeba370 RCX: 7f8bdea18000 RDX: 22c18020 RSI: 1000 RDI: 7f8bdea18000 RBP: 7f8c3ab82e40 R8: 7f8bb80c9a40 R9: 7f8c3aeba498 R10: R11: 22c18020 R12: 22c18020 R13: 00022c18 R14: R15: ORIG_RAX: CS: 0033 SS: 002b ## kernel 4.4 # kern.log 544 [ 360.282132] INFO: task qemu-system-x86:1592 blocked for more than 120 seconds. 545 [ 360.282984] Not tainted 4.4.0-27-generic #46~14.04.1-Ubuntu 546 [ 360.283581] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 547 [ 360.284439] qemu-system-x86 D 8800bb833e90 0 1592 1 0x 548 [ 360.284443] 8800bb833e90 88023151c4c0 8802345eb700 8800bb834000 549 [ 360.28]
[Group.of.nepali.translators] [Bug 1596941] Re: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive)
[Expired for linux (Ubuntu) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1596941 Title: KVM deadlock on KVM guest migration with latest QEMU (mitaka) from Xenial (or Mitaka Ubuntu Cloud Archive) Status in linux package in Ubuntu: Expired Status in linux source package in Trusty: Expired Status in linux source package in Vivid: Expired Status in linux source package in Wily: Expired Status in linux source package in Xenial: Expired Status in linux source package in Yakkety: Expired Bug description: It was brought to my knowledge that qemu-kvm live migration (with full storage copy) on Trusty + Mitaka Ubuntu Cloud Archive was broken. When investigating I stepped into the following situation: crash> sys KERNEL: /usr/lib/debug/boot/vmlinux-3.13.0-86-generic DUMPFILE: ./201606241546/dump.201606241546 [PARTIAL DUMP] CPUS: 4 DATE: Fri Jun 24 15:46:39 2016 UPTIME: 00:06:00 LOAD AVERAGE: 1.00, 0.60, 0.26 TASKS: 146 NODENAME: vmqemulivefail1 RELEASE: 3.13.0-86-generic VERSION: #131-Ubuntu SMP Thu May 12 23:33:13 UTC 2016 MACHINE: x86_64 (2494 Mhz) MEMORY: 8 GB PANIC: "Kernel panic - not syncing: hung_task: blocked tasks" Full backtrace doesn't have anything useful since i've configured kernel.softlockup_panic. From scheduled-out tasks (and from kern.log) I was able to see that in more than one occasion I had the qemu process possibly dead-locked when dealing with asynchronous page faults: ## kernel 3.13 # dump 1 PID: 1604 TASK: 8800374be000 CPU: 3 COMMAND: "qemu-system-x86" #0 [8800ba115e28] __schedule at 8172e379 #1 [8800ba115e90] schedule at 8172e859 #2 [8800ba115ea0] kvm_async_pf_task_wait at 8105060f #3 [8800ba115f38] do_async_page_fault at 81736090 #4 [8800ba115f50] async_page_fault at 81732cd8 RIP: 7fb4eff0a4b3 RSP: 7fb4713facb0 RFLAGS: 00010206 RAX: 7fb4cb9cf000 RBX: 7fb4f166d8f0 RCX: 0010 RDX: 1fff RSI: 7fb4cb9deff8 RDI: 4000 RBP: R8: R9: 0002601b R10: 00fffe00 R11: 1fff R12: 0008 R13: 7fb4713fad84 R14: 7fb4f1665290 R15: 7fb4713fad88 ORIG_RAX: CS: 0033 SS: 002b # dump 2 PID: 1735 TASK: 8800b9bcb000 CPU: 2 COMMAND: "qemu-system-x86" #0 [8802333c9e28] __schedule at 8172e379 #1 [8802333c9e90] schedule at 8172e859 #2 [8802333c9ea0] kvm_async_pf_task_wait at 8105060f #3 [8802333c9f38] do_async_page_fault at 81736090 #4 [8802333c9f50] async_page_fault at 81732cd8 RIP: 7f631399d3b0 RSP: 7f62912c7990 RFLAGS: 00010206 RAX: RBX: 7f6315f9e370 RCX: 7f62ca714000 RDX: 32914020 RSI: 1000 RDI: 7f62ca714000 RBP: 7f6315c66e40 R8: 7f62912c7a40 R9: 7f6315f9e3e0 R10: R11: 32914020 R12: 32914020 R13: 00032914 R14: R15: ORIG_RAX: CS: 0033 SS: 002b # dump 3 PID: 1617 TASK: 880232834800 CPU: 3 COMMAND: "qemu-system-x86" #0 [880232a6de28] __schedule at 8172e379 #1 [880232a6de90] schedule at 8172e859 #2 [880232a6dea0] kvm_async_pf_task_wait at 8105060f #3 [880232a6df38] do_async_page_fault at 81736090 #4 [880232a6df50] async_page_fault at 81732cd8 RIP: 7f8c39e8b3b0 RSP: 7f8bb80c9990 RFLAGS: 00010206 RAX: RBX: 7f8c3aeba370 RCX: 7f8bdea18000 RDX: 22c18020 RSI: 1000 RDI: 7f8bdea18000 RBP: 7f8c3ab82e40 R8: 7f8bb80c9a40 R9: 7f8c3aeba498 R10: R11: 22c18020 R12: 22c18020 R13: 00022c18 R14: R15: ORIG_RAX: CS: 0033 SS: 002b ## kernel 4.4 # kern.log 544 [ 360.282132] INFO: task qemu-system-x86:1592 blocked for more than 120 seconds. 545 [ 360.282984] Not tainted 4.4.0-27-generic #46~14.04.1-Ubuntu 546 [ 360.283581] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 547 [ 360.284439] qemu-system-x86 D 8800bb833e90 0 1592 1 0x 548 [ 360.284443] 8800bb833e90 88023151c4c0 8802345eb700 8800bb834000 549 [ 360.28] 0010
