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GNU C Library master sources branch master updated. glibc-2.22-673-ga3e5b4f
- From: tuliom at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 15 Jan 2016 18:54:11 -0000
- Subject: GNU C Library master sources branch master updated. glibc-2.22-673-ga3e5b4f
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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=a3e5b4feeb54cb92657ec2bc6d9be1fcef9e8575
commit a3e5b4feeb54cb92657ec2bc6d9be1fcef9e8575
Author: Paul E. Murphy <murphyp@linux.vnet.ibm.com>
Date: Mon Jan 11 17:24:04 2016 -0500
Fix race in tst-mqueue5
The check is done on line 117 by a thread spawned
from do_child(), forked from do_test(). This test
generates a signal in the forked process.
Either thread may handle the signal, and on ppc,
it happens to be done on do_child, on the thread
which is not doing the check on line 117.
This exposes a race condition whereby the test
incorrectly fails as the signal is caught during
or after the check.
This is mitigated by ensuring the signal is blocked
in the child thread while thread is running.
diff --git a/ChangeLog b/ChangeLog
index 7f2a19d..fb5cd0e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2016-01-15 Paul E. Murphy <murphyp@linux.vnet.ibm.com>
+
+ * rt/tst-mqueue5.c (thr): Cleanup misleading comment.
+ (do_child): Mask SIGRTMIN while thr is running.
+
2016-01-15 Martin Sebor <msebor@redhat.com>
[BZ #19432]
diff --git a/rt/tst-mqueue5.c b/rt/tst-mqueue5.c
index aa74fa3..25042bc 100644
--- a/rt/tst-mqueue5.c
+++ b/rt/tst-mqueue5.c
@@ -116,7 +116,7 @@ thr (void *arg)
if (rtmin_cnt != 2)
{
- puts ("SIGRTMIN signal in child did not arrive");
+ puts ("SIGRTMIN signal in thread did not arrive");
result = 1;
}
else if (rtmin_pid != getppid ()
@@ -403,6 +403,16 @@ do_child (const char *name, pthread_barrier_t *b2, pthread_barrier_t *b3,
result = 1;
}
+ /* Ensure the thr thread gets the signal, not us. */
+ sigset_t set;
+ sigemptyset (&set);
+ sigaddset (&set, SIGRTMIN);
+ if (pthread_sigmask (SIG_BLOCK, &set, NULL))
+ {
+ printf ("Failed to block SIGRTMIN in child: %m\n");
+ result = 1;
+ }
+
(void) pthread_barrier_wait (b2);
/* Parent calls mqsend (q), which should wake up mqrecv (q)
@@ -514,7 +524,14 @@ do_child (const char *name, pthread_barrier_t *b2, pthread_barrier_t *b3,
result = 1;
}
- void *thr_ret;
+ /* Reenable test signals before cleaning up the thread. */
+ if (pthread_sigmask (SIG_UNBLOCK, &set, NULL))
+ {
+ printf ("Failed to unblock SIGRTMIN in child: %m\n");
+ result = 1;
+ }
+
+ void *thr_ret;
ret = pthread_join (th, &thr_ret);
if (ret)
{
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 5 +++++
rt/tst-mqueue5.c | 21 +++++++++++++++++++--
2 files changed, 24 insertions(+), 2 deletions(-)
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