Re: Hanging udev process on nfs-mounted /dev

[Frank Steiner <fsteiner-mail@bio.ifi.lmu.de>]

Hi Kay,

with version 04 of your deadlock patch, the three hosts which still use
/dev over nfs have now been rebooting in a loop (rebooting every 5 minutes
with extra, parallel udevstart calls) for two days without any  lockups.
The same rebooting mechanism reliably locked them up in all the former
tests, so I guess that all possible deadlocks (at least those caused by
non-locking NFS) are fixed! I see all the warnings in the logs, so I can
tell that the deadlock situations happen a few times a day, but patch
unbreaks them all. So I guess you can make it final.

The hosts running tmps didn't have any problems at all, with or without
the patch.

Just a minor problem: With the deadlock patch I can't compile udev with
"USE_LOGúlse DEBUGúlse". I fixed that by putting an #ifdef around, i.e.,

+static void tdb_log(TDB_CONTEXT *tdb, int level, const char *format, ...)
+{
+	va_list args;
+
+	if (!udev_log)
+		return;
+
+#ifdef LOG
+	va_start(args, format);
+	vsyslog(level, format, args);
+	va_end(args);
+#endif
+}

Not sure if that makes any sense except making it compile, but you
will know better :-)

Thanks again for all your help and consistent patching :-)
cu,
Frank

-- 
Dipl.-Inform. Frank Steiner   Web:  http://www.bio.ifi.lmu.de/~steiner/
Lehrstuhl f. Bioinformatik    Mail: http://www.bio.ifi.lmu.de/~steiner/m/
LMU, Amalienstr. 17           Phone: +49 89 2180-4049
80333 Muenchen, Germany       Fax:   +49 89 2180-99-4049
* Rekursion kann man erst verstehen, wenn man Rekursion verstanden hat. *


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