https://bz.apache.org/bugzilla/show_bug.cgi?id=61817
Bug ID: 61817
Summary: ap_get_exec_line() creates defunct/zombie process
Product: Apache httpd-2
Version: 2.4.29
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_authz_ldap
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 35555
--> https://bz.apache.org/bugzilla/attachment.cgi?id=35555&action=edit
patch to server/util.c (ap_get_exec_line)
ap_get_exec_line() calls apr_file_close(), but it is not enough to terminate
the child process; it should call apr_proc_wait().
I'll attach a patch.
This will occur only when we use
AuthLDAPBindPassword exec:/path/to/command/to/echo/password
directive. Thus it is difficult to reproduce.
So I checked my patch with customized server/log.c.
I added last two lines.
void ap_logs_child_init(apr_pool_t *p, server_rec *s)
{
read_handle_t *cur = read_handles;
while (cur) {
apr_file_close(cur->handle);
cur = cur->next;
}
const char *argv[] = {"dummyXXXX"}; /* added for test */
ap_get_exec_line(p, "/bin/mktemp", argv); /* added for test */
}
We can easily see defunct mktemp without patch. With patch, we don't see.
% ./apachectl start
% ps aux | grep Z
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
me 19398 0.0 0.0 0 0 ? Z 14:42 0:00 [mktemp]
<defunct>
me 19399 0.0 0.0 0 0 ? Z 14:42 0:00 [mktemp]
<defunct>
me 19400 0.0 0.0 0 0 ? Z 14:42 0:00 [mktemp]
<defunct>
me 19485 0.0 0.0 14860 2184 pts/3 S+ 14:42 0:00 grep
--color=auto Z
NOTE: Sorry, argv have no effect. I may misunderstand how to use argv.
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