When running this test on 3 concurrent VMs with this kernel this runs fine. With the ZFS backing store of the VMs set to sync on writes, I can slow the I/O and I get a lot of timeout issues which result in tests running for a long time and probably would get nuked by the testing infrastructure - see attached dmesg log for the timeouts.
I am currently speculating that the tests are failing because VFAT is sub-optimal compared to other file systems and with a slow backing store we may be just getting lockup warnings because of slow I/O write out and/or syncs. At least I have a reproducer. I don't think this is a critical show stopping bug. I will try and figure out what particular stress case is causing the issue, but this may take a while to iterate through. ** Attachment added: "dmesg log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1786462/+attachment/5173892/+files/dmesg.log -- 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/1786462 Title: linux 4.17.0-7.8 ADT test failure with linux 4.17.0-7.8 Status in ubuntu-kernel-tests: New Status in linux package in Ubuntu: Incomplete Status in linux source package in Cosmic: Incomplete Bug description: Testing failed on: i386: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-cosmic/cosmic/i386/l/linux/20180810_012246_01e82@/log.gz To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1786462/+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
