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pidfile_open() sets *pidptr to -1 if the process currently holding the lock is between pidfile_open() and pidfile_write(), the subsequent kill(mountdpid) would potentially SIGHUP all non-system processes except init: just sleep for half a millisecond and try again in that case Reviewed-by: Don Brady <don.brady@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: John Kennedy <john.kennedy@delphix.com> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12067