Hello all, The fix released to address this bug's issue unfortunately leads to problem for those who use the Lustre filesystem (see http://www.lustre.org): - kernel hangs when attempting to mount a Lustre filesystem with the wrong "NID" (which fortunately should not happen in normal operating conditions) - *huge* amount of "warn_slowpath" messages in the kernel logs as soon as files are created or stat-ed on the mounted Lustre filesystem(s), resulting in degraded performances (~30%) and very fast log clogging (kern.log file growing to 1.5GB during a single bonnie++ test of 30 minutes); see attached file for /var/log/kern.log exerpts
In order to fix those issues, we had to revert the commits mentioned in comment 44 ; more precisely: # git clone git://kernel.ubuntu.com/ubuntu/ubuntu-lucid.git # cd ubuntu-lucid/ # git diff -R fb743c6...a192aa1 > 2.6.32-28-writeback-revert.patch (and apply the patch to the Ubuntu/Lucid Linux kernel source package before building new kernel packages) I hope this may help those unfortunates who stumble on the same problem. Cheers ** Attachment added: "/var/log/kern.log exerpts (warn_slowpath errors)" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/585092/+attachment/1878374/+files/lucid64-2.6.32-28-generic.warn_slowpath.kern.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/585092 Title: giant IO delays on unmount -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
