Attilio Rao <[email protected]> wrote in <CAJ-FndAChGndC=lkzni7i6mot+spw3-ofto9rh0+5wnnvwz...@mail.gmail.com>:
at> This should be enough for someone NFS-aware to look into it. at> at> Were you also able to get a core? Yes. But as kib@ pointed out it seems a deadlock in ZFS. Some experiments I did showed that this deadlock can be triggered at least by doing "rm -rf" against a local directory that has a large number of files/sub-directories. Then, I updated the kernel with the latest 8-STABLE + WITNESS option because a fix for LOR of spa_config lock was committed and tracking locks without WITNESS was hard. The deadlock can still be triggered after that. During this investigation an disk has to be replaced and resilvering it is now in progress. A deadlock and a forced reboot after that make recovering of the zfs datasets take a long time (for committing logs, I think), so I will try to reproduce the deadlock and get a core dump after it finished. If the old kernel and core of the deadlock I reported on Saturday are still useful for debugging, I can put them to somewhere you can access. -- Hiroki
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