We've recently upgraded the OS on one of our servers, and since then have been experiencing frequent stalls of the XFS filesystem on it. Other filesystems on the machine seem to still respond fine while XFS hangs. The stalls sometimes last for around 30 minutes, during which all attempts to access that filesystem hang completely - after that, the filesystem suddenly responds instantly again, as if there had never been any problem. The dmesg is full of these messages while it stalls: XFS: possible memory allocation deadlock in kmem_alloc (mode:0x8250) These also occour from time to time without the filesystem stalling (or at least it's not noticeable) - the messages appear about once in two hours, the stalls about once a day. Google did point me to some reports of these messages occouring at the end of 2013, but the kernels in question should all have had the fixes proposed back then - although one message back then suggested there were more places where this problem could occour that were not fixed yet. Kernels used were: - Ubuntu 3.13.0-44 - shows stalls, according to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1382333 has the fix - Ubuntu 3.16.0-31 - shows stalls - Ubuntu 3.2.0-various - no stalls in more than 1 year We can actually still boot the machine with the 3.2.0 kernel, and it will run absolutely fine, but as that kernel will not be supported forever, I do not consider that a permanent solution. The machine should not be low on memory, the disk array far from its limits, and the I/O-load is mostly reads with very little writes, as this is a public FTP server. I have tried to collect some information, available at https://grid.rrze.uni-erlangen.de/~unrz191/syslog-with-xfs-hangs.log Regards, -- Michael Meier, Zentrale Systeme Friedrich-Alexander-Universitaet Erlangen-Nuernberg Regionales Rechenzentrum Erlangen Martensstrasse 1, 91058 Erlangen, Germany Tel.: +49 9131 85-28973, Fax: +49 9131 302941 michael.meier@xxxxxx www.rrze.fau.de _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
