Red Hat Bugzilla – Bug 147798
make_panic hangs for several minutes
Last modified: 2009-04-16 16:30:13 EDT
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Description of problem:
I run "make_panic -f3" on a seven node cluster. After running
for some time, the make_panic processes on all machines will
stop. A lock dump shows they are all waiting on a single lock
that GFS is caching on some node but isn't releasing. It appears
that a blocking callback isn't being delivered to GFS for this
lock. After several minutes, gfs releases locks it's not
using which allows all the processes to get this lock and they
all run fine again until it happens again.
There are several cases in process_asts() where we decide to
skip sending a bast. One of those may be incorrect; some
debugging should tell.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. make_panic -f 3 on several nodes
Changes by: firstname.lastname@example.org 2005-02-16 03:53:16
dlm-kernel/src : lockqueue.c
Blocking asts were being ignored for all locks being
converted which resulted in some necessary basts being skipped. In
particular, after a failed NOQUEUE conversion, gfs could be left
holding a lock and getting no callback for it while others were left
This changes things so that a bast message is ignored if the
lock is being converted and NOQUEUE isn't set, or if the locks is
being unlocked. Fixes bz 147798.
Changes by: email@example.com 2005-02-16 04:03:50
We were ignoring blocking callbacks for locks being converted
which caused us to skip some that were necessary.
Fixes bz 147798 (along with similar dlm fix)