Hi all, I think we just hit the same bug on a Production server today, with a snapshot on the root filesystem. Here are the relevant logs :
kernel: [455151.056975] INFO: task jbd2/dm-0-8:214 blocked for more than 120 seconds. kernel: [455151.149417] INFO: task dmeventd:27193 blocked for more than 120 seconds. kernel: [455151.241272] INFO: task cat:27522 blocked for more than 120 seconds. ... All I/Os on the filesystem were blocked, so we had to reboot the server. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lvm2 in Ubuntu. https://bugs.launchpad.net/bugs/1645636 Title: deadlock during lvm snapshot Status in lvm2 package in Ubuntu: Confirmed Bug description: I'm doing backup of a running mongodb using LVM snapshot. Sometimes I run into a deadlock situation and kernel reports blocked tasks for jbd2, mongod, dmeventd and my tar doing backup. This happens very rarely (one in a thousand) but the effect is rather severe as mongodb stops working. I also can't remove and unmount the snapshot. I have Ubuntu 16.04.1 (lvm2 2.02.133-1ubuntu10) with mongod 3.2.9 on a 64bit system. According to the link below its a kernel race with considerably decreased chance in latest lvm2 package. https://www.redhat.com/archives/linux-lvm/2016-November/msg00037.html To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1645636/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
