From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.6) Gecko/20050328 Firefox/1.0.2 Fedora/1.0.2-3 Description of problem: If an error occurs in a dlm_lock() operation done from userspace, the dlm returns an incorrect error code. In fact it often returns just a large random number which the library interprets as a lockID. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: Run the following program: #include <inttypes.h> #include <sys/types.h> #include <stdio.h> #include <errno.h> #include "libdlm.h" int main(int argc, char *argv[]) { int status; int lockid; status = lock_resource("LOCKNAME", -1, /* -1 is not a valid lock mode */ 0, &lockid); printf("lock status = %d, errno = %d\n", status, errno); } Actual Results: The program hangs in libdlm waiting for the DLM to deliver an AST which never comes (because the lock call was in error) Expected Results: The output: "lock status = -1, errno = 22" Additional info: The following patch fixes it: diff -u -p -r1.24.2.1 device.c --- device.c 2 Feb 2005 09:55:08 -0000 1.24.2.1 +++ device.c 15 Apr 2005 13:18:22 -0000 @@ -975,6 +975,9 @@ static int do_user_lock(struct file_info bast_routine : NULL, kparams->range.ra_end ? &kparams->range : NULL); + if (status) + goto out_err; + /* If it succeeded (this far) with a new lock then keep track of it on the file's lkb list */ if (!status && !(kparams->flags & DLM_LKF_CONVERT)) {
Fixed on FC4 branch
Also now fixed on RHEL4 branch so it should appear in U2
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2005-735.html