On środa, 1 września 2010 o 17:39:55 Tim Gardner wrote: > I've been pursuing a simple reproducer for an NFS lockup that shows up > under stress. There is a bunch of info (some of it extraneous) in > http://bugs.launchpad.net/bugs/561210. I can reproduce it by writing > loop mounted NFS exports: > > /etc/fstab: 127.0.0.1:/srv /mnt/srv nfs rw 0 2 > /etc/exports: /srv 127.0.0.1(rw,insecure,no_subtree_check) > > See the attached scripts test_master.sh and test_client.sh. I simply > repeat './test_master.sh wait' until nfsd locks up, typically within 1-3 > cycles, e.g., > > cd /mnt/srv > while true; do ./test_master.sh wait; done > > Note that this test will run indefinitely if invoked from /srv, e.g., > > cd /srv > while true; do ./test_master.sh wait; done > > This issue, or something like it, appears to exist as far back as I've > tested (Ubuntu Lucid 2.6.32.21). For now I'm assuming that, since the > symptoms are similar, any lockup bug found in -rc3 is the likely culprit. > > See attached dmesg and config. Debug options of interest that I've > enabled are CONFIG_DEBUG_SLAB, CONFIG_DEBUG_SLAB_LEAK, > CONFIG_DEBUG_SPINLOCK, CONFIG_DEBUG_MUTEXES. > > dmesg.txt contains the initial 'INFO: task nfsd:1263 blocked for more > than 120 seconds.' complaints as well as information dumped from > > echo d | sudo tee /proc/sysrq-trigger > echo w | sudo tee /proc/sysrq-trigger > > Anything else I can provide? > > rtg I created a Bugzilla entry at https://bugzilla.kernel.org/show_bug.cgi?id=17762 for your bug report, please add your address to the CC list in there, thanks! -- Maciej Rutecki http://www.maciek.unixy.pl -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
