Rich Ercolani e79b6807b8 Workaround issue cleaning up automounted snapshots on Linux ... On Linux, sometimes, when ZFS goes to unmount an automounted snap, it fails a VERIFY check on debug builds, because taskq_cancel_id returned ENOENT after not finding the taskq it was trying to cancel. This presumably happens when it already died for some reason; in this case, we don't really mind it already being dead, since we're just going to dispatch a new task to unmount it right after. So we just ignore it if we get back ENOENT trying to cancel here, retry a couple times if we get back the only other possible condition (EBUSY), and log to dbgmsg if we got anything but ENOENT or success. (We also add some locking around taskqid, to avoid one or two cases of two instances of trying to cancel something at once.) Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Rich Ercolani <rincebrain@gmail.com> Closes #11632 Closes #12670		2021-11-03 09:00:08 -06:00
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spl	Update checkstyle workflow env to ubuntu-20.04	2021-11-02 14:02:57 -06:00
zfs	Workaround issue cleaning up automounted snapshots on Linux	2021-11-03 09:00:08 -06:00