[Kernel-packages] [Bug 1805693] Re: User reports a hang on 18.04 LTS(4.15.18) under a heavy I/O load
*** This bug is a duplicate of bug 1810998 *** https://bugs.launchpad.net/bugs/1810998 This issue seems to occur with kernels > 4.10 and < v4.19 and got already fixed with applying two patches to bionic (and cosmic) in LP 1810998 - thx to Mauricio Faria de Oliveira. Hence this bug here can be considered as done and I mark this bug as a duplicate of LP 1810998. ** This bug has been marked a duplicate of bug 1810998 CPU hard lockup with rigorous writes to NVMe drive -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805693 Title: User reports a hang on 18.04 LTS(4.15.18) under a heavy I/O load Status in linux package in Ubuntu: Triaged Status in linux source package in Bionic: Triaged Bug description: User reports a hang under heavy I/O: The IO hang problem on our cloud is caused by IO hang in block-wbt wbt_wait. The fix commit id is 2887e41b910bb14fd847cf01ab7a5993db989d88. It is a block write buffer throttle queue lock contention and thundering herd issue in wbt_wait() We can recreate the problem easily by running concurrent IO from multiple VMs with sequential write. We can provide fio workload as needed for recreate. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805693/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805693] Re: User reports a hang on 18.04 LTS(4.15.18) under a heavy I/O load
** Changed in: linux (Ubuntu) Importance: Undecided => High ** Changed in: linux (Ubuntu) Status: Incomplete => Triaged ** Also affects: linux (Ubuntu Bionic) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Bionic) Status: New => Triaged ** Changed in: linux (Ubuntu Bionic) Importance: Undecided => High ** Tags added: kernel-da-key -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805693 Title: User reports a hang on 18.04 LTS(4.15.18) under a heavy I/O load Status in linux package in Ubuntu: Triaged Status in linux source package in Bionic: Triaged Bug description: User reports a hang under heavy I/O: The IO hang problem on our cloud is caused by IO hang in block-wbt wbt_wait. The fix commit id is 2887e41b910bb14fd847cf01ab7a5993db989d88. It is a block write buffer throttle queue lock contention and thundering herd issue in wbt_wait() We can recreate the problem easily by running concurrent IO from multiple VMs with sequential write. We can provide fio workload as needed for recreate. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805693/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805693] Re: User reports a hang on 18.04 LTS(4.15.18) under a heavy I/O load
** Tags added: cscc -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805693 Title: User reports a hang on 18.04 LTS(4.15.18) under a heavy I/O load Status in linux package in Ubuntu: Triaged Status in linux source package in Bionic: Triaged Bug description: User reports a hang under heavy I/O: The IO hang problem on our cloud is caused by IO hang in block-wbt wbt_wait. The fix commit id is 2887e41b910bb14fd847cf01ab7a5993db989d88. It is a block write buffer throttle queue lock contention and thundering herd issue in wbt_wait() We can recreate the problem easily by running concurrent IO from multiple VMs with sequential write. We can provide fio workload as needed for recreate. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805693/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp