Hi, all
I execute fork12 test and OMM killer begin send SIGKILL to its children and
fork return success always.
fork12 hang up in this case, so I create the patch (see attach), which check
whether someone child killed and if it occur, return number of forked
processes.
--- /home/shpagin/tmp/ltp-base-20080531/testcases/kernel/syscalls/fork/fork12.c 2008-06-01 14:37:06.000000000 +0400
+++ /home/shpagin/ltp-base-20080531/testcases/kernel/syscalls/fork/fork12.c 2008-06-06 22:08:49.000000000 +0400
@@ -62,7 +62,7 @@ int
main(int ac, char **av)
{
int forks, pid1, fork_errno, waitstatus;
-
+ int ret, status;
int lc; /* loop counter */
char *msg; /* message returned from parse_opts */
@@ -96,6 +96,18 @@ main(int ac, char **av)
exit(0);
}
forks++;
+ ret = waitpid(-1, &status, WNOHANG);
+ if (ret < 0)
+ tst_brkm(TBROK, cleanup, "waitpid failed %d: %s\n", \
+ errno, strerror(errno));
+ if (ret > 0) {
+ /* a child may be killed by OOM killer */
+ if (WTERMSIG(status) == SIGKILL)
+ break;
+ tst_brkm(TBROK, cleanup, \
+ "child exit with error code %d or signal %d", \
+ WEXITSTATUS(status), WTERMSIG(status));
+ }
}
fork_errno = errno;
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