[LU-5918] (lcommon_misc.c:194:cl_put_grouplock()) ASSERTION( cg->cg_gid ) failed

Duplicate — Fri, 14 Nov 2014 01:31:57 +0000

Taking and releasing a group lock with group id 0 will crash the client. Works for any user.

/* gcc -Wall grplock.c -o grplock -Ilustre/include -Ilibcfs/include */

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <errno.h>

#include <lustre/lustreapi.h>

int main(void)
{
	int fd;
	const char *dname = "/mnt/lustre/testfile";
	int rc;

	fd = open(dname, O_CREAT | O_RDWR, 0600);
	printf("fd=%d\n", fd);

	rc = ioctl(fd, LL_IOC_GROUP_LOCK, 0);
	printf("rc=%d %d\n", rc, errno);

	rc = ioctl(fd, LL_IOC_GROUP_UNLOCK, 0);
	printf("rc=%d %d\n", rc, errno);

	return 0;
}

2 ways to fix, depending on whether group id 0 is special. Either reject the lock when group id is 0, or remove that assert.

Whamcloud Community JIRA

[LU-5918] (lcommon_misc.c:194:cl_put_grouplock()) ASSERTION( cg->cg_gid ) failed