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Take mutex in cleanup only if it is not already taken (pr#14652)

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This commit is contained in:
Siddhesh Poyarekar 2012-10-04 11:57:51 +05:30
parent f6de48ac9d
commit 080a305bf2
2 changed files with 452 additions and 2 deletions
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443
glibc-rh552960-2.patch Normal file
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@ -0,0 +1,443 @@
diff --git a/nptl/Makefile b/nptl/Makefile
index f21276c..de324fa 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -206,7 +206,8 @@ tests = tst-typesizes \
tst-cond1 tst-cond2 tst-cond3 tst-cond4 tst-cond5 tst-cond6 tst-cond7 \
tst-cond8 tst-cond9 tst-cond10 tst-cond11 tst-cond12 tst-cond13 \
tst-cond14 tst-cond15 tst-cond16 tst-cond17 tst-cond18 tst-cond19 \
- tst-cond20 tst-cond21 tst-cond22 tst-cond23 tst-cond24 tst-cond-except \
+ tst-cond20 tst-cond21 tst-cond22 tst-cond23 tst-cond24 tst-cond25 \
+ tst-cond-except \
tst-robust1 tst-robust2 tst-robust3 tst-robust4 tst-robust5 \
tst-robust6 tst-robust7 tst-robust8 tst-robust9 \
tst-robustpi1 tst-robustpi2 tst-robustpi3 tst-robustpi4 tst-robustpi5 \
@@ -276,6 +276,7 @@ gen-as-const-headers = pthread-errnos.sym
LDFLAGS-pthread.so = -Wl,--enable-new-dtags,-z,nodelete,-z,initfirst
LDFLAGS-tst-cond24 = -lrt
+LDFLAGS-tst-cond25 = -lrt
include ../Makeconfig
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S
index 6761c13..884987c 100644
--- a/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S
+++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S
@@ -649,10 +649,24 @@ __condvar_tw_cleanup:
movl $0x7fffffff, %edx
ENTER_KERNEL
+ /* Lock the mutex only if we don't own it already. This only happens
+ in case of PI mutexes, if we got cancelled after a successful
+ return of the futex syscall and before disabling async
+ cancellation. */
5: movl 24+FRAME_SIZE(%esp), %eax
- call __pthread_mutex_cond_lock
+ movl MUTEX_KIND(%eax), %ebx
+ andl $(ROBUST_BIT|PI_BIT), %ebx
+ cmpl $PI_BIT, %ebx
+ jne 8f
+
+ movl (%eax), %ebx
+ andl $TID_MASK, %ebx
+ cmpl %ebx, %gs:TID
+ je 9f
+
+8: call __pthread_mutex_cond_lock
- movl %esi, (%esp)
+9: movl %esi, (%esp)
.LcallUR:
call _Unwind_Resume
hlt
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S
index 0af06ac..bf1e5fe 100644
--- a/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S
+++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S
@@ -566,10 +566,24 @@ __condvar_w_cleanup:
movl $0x7fffffff, %edx
ENTER_KERNEL
+ /* Lock the mutex only if we don't own it already. This only happens
+ in case of PI mutexes, if we got cancelled after a successful
+ return of the futex syscall and before disabling async
+ cancellation. */
5: movl 24+FRAME_SIZE(%esp), %eax
- call __pthread_mutex_cond_lock
+ movl MUTEX_KIND(%eax), %ebx
+ andl $(ROBUST_BIT|PI_BIT), %ebx
+ cmpl $PI_BIT, %ebx
+ jne 8f
+
+ movl (%eax), %ebx
+ andl $TID_MASK, %ebx
+ cmpl %ebx, %gs:TID
+ je 9f
+
+8: call __pthread_mutex_cond_lock
- movl %esi, (%esp)
+9: movl %esi, (%esp)
.LcallUR:
call _Unwind_Resume
hlt
diff --git a/nptl/sysdeps/unix/sysv/linux/pthread-pi-defines.sym b/nptl/sysdeps/unix/sysv/linux/pthread-pi-defines.sym
index 46fbd0d..0ac51db 100644
--- a/nptl/sysdeps/unix/sysv/linux/pthread-pi-defines.sym
+++ b/nptl/sysdeps/unix/sysv/linux/pthread-pi-defines.sym
@@ -6,3 +6,4 @@ MUTEX_KIND offsetof (pthread_mutex_t, __data.__kind)
ROBUST_BIT PTHREAD_MUTEX_ROBUST_NORMAL_NP
PI_BIT PTHREAD_MUTEX_PRIO_INHERIT_NP
PS_BIT PTHREAD_MUTEX_PSHARED_BIT
+TID_MASK FUTEX_TID_MASK
diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S
index b669abb..eb13326 100644
--- a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S
+++ b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S
@@ -771,10 +771,24 @@ __condvar_cleanup2:
movl $SYS_futex, %eax
syscall
+ /* Lock the mutex only if we don't own it already. This only happens
+ in case of PI mutexes, if we got cancelled after a successful
+ return of the futex syscall and before disabling async
+ cancellation. */
5: movq 16(%rsp), %rdi
- callq __pthread_mutex_cond_lock
+ movl MUTEX_KIND(%rdi), %eax
+ andl $(ROBUST_BIT|PI_BIT), %eax
+ cmpl $PI_BIT, %eax
+ jne 7f
+
+ movl (%rdi), %eax
+ andl $TID_MASK, %eax
+ cmpl %eax, %fs:TID
+ je 8f
+
+7: callq __pthread_mutex_cond_lock
- movq 24(%rsp), %rdi
+8: movq 24(%rsp), %rdi
movq FRAME_SIZE(%rsp), %r15
movq FRAME_SIZE+8(%rsp), %r14
movq FRAME_SIZE+16(%rsp), %r13
diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
index ec403cd..6c6dc0e 100644
--- a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
+++ b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
@@ -495,10 +495,24 @@ __condvar_cleanup1:
movl $SYS_futex, %eax
syscall
+ /* Lock the mutex only if we don't own it already. This only happens
+ in case of PI mutexes, if we got cancelled after a successful
+ return of the futex syscall and before disabling async
+ cancellation. */
5: movq 16(%rsp), %rdi
- callq __pthread_mutex_cond_lock
+ movl MUTEX_KIND(%rdi), %eax
+ andl $(ROBUST_BIT|PI_BIT), %eax
+ cmpl $PI_BIT, %eax
+ jne 7f
+
+ movl (%rdi), %eax
+ andl $TID_MASK, %eax
+ cmpl %eax, %fs:TID
+ je 8f
+
+7: callq __pthread_mutex_cond_lock
- movq 24(%rsp), %rdi
+8: movq 24(%rsp), %rdi
.LcallUR:
call _Unwind_Resume@PLT
hlt
diff --git a/nptl/tst-cond25.c b/nptl/tst-cond25.c
new file mode 100644
index 0000000..4488e74
--- /dev/null
+++ b/nptl/tst-cond25.c
@@ -0,0 +1,282 @@
+/* Verify that condition variables synchronized by PI mutexes don't hang on
+ on cancellation.
+ Copyright (C) 2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <time.h>
+
+#define NUM 5
+#define ITERS 10000
+#define COUNT 100
+
+typedef void *(*thr_func) (void *);
+
+pthread_mutex_t mutex;
+pthread_cond_t cond;
+
+void cleanup (void *u)
+{
+ /* pthread_cond_wait should always return with the mutex locked. */
+ if (pthread_mutex_unlock (&mutex))
+ abort ();
+}
+
+void *
+signaller (void *u)
+{
+ int i, ret = 0;
+ void *tret = NULL;
+
+ for (i = 0; i < ITERS; i++)
+ {
+ if ((ret = pthread_mutex_lock (&mutex)) != 0)
+ {
+ tret = (void *)1;
+ printf ("signaller:mutex_lock failed: %s\n", strerror (ret));
+ goto out;
+ }
+ if ((ret = pthread_cond_signal (&cond)) != 0)
+ {
+ tret = (void *)1;
+ printf ("signaller:signal failed: %s\n", strerror (ret));
+ goto unlock_out;
+ }
+ if ((ret = pthread_mutex_unlock (&mutex)) != 0)
+ {
+ tret = (void *)1;
+ printf ("signaller:mutex_unlock failed: %s\n", strerror (ret));
+ goto out;
+ }
+ pthread_testcancel ();
+ }
+
+out:
+ return tret;
+
+unlock_out:
+ if ((ret = pthread_mutex_unlock (&mutex)) != 0)
+ printf ("signaller:mutex_unlock[2] failed: %s\n", strerror (ret));
+ goto out;
+}
+
+void *
+waiter (void *u)
+{
+ int i, ret = 0;
+ void *tret = NULL;
+ int seq = (int)u;
+
+ for (i = 0; i < ITERS / NUM; i++)
+ {
+ if ((ret = pthread_mutex_lock (&mutex)) != 0)
+ {
+ tret = (void *)1;
+ printf ("waiter[%u]:mutex_lock failed: %s\n", seq, strerror (ret));
+ goto out;
+ }
+ pthread_cleanup_push (cleanup, NULL);
+
+ if ((ret = pthread_cond_wait (&cond, &mutex)) != 0)
+ {
+ tret = (void *)1;
+ printf ("waiter[%u]:wait failed: %s\n", seq, strerror (ret));
+ goto unlock_out;
+ }
+
+ if ((ret = pthread_mutex_unlock (&mutex)) != 0)
+ {
+ tret = (void *)1;
+ printf ("waiter[%u]:mutex_unlock failed: %s\n", seq, strerror (ret));
+ goto out;
+ }
+ pthread_cleanup_pop (0);
+ }
+
+out:
+ puts ("waiter tests done");
+ return tret;
+
+unlock_out:
+ if ((ret = pthread_mutex_unlock (&mutex)) != 0)
+ printf ("waiter:mutex_unlock[2] failed: %s\n", strerror (ret));
+ goto out;
+}
+
+void *
+timed_waiter (void *u)
+{
+ int i, ret;
+ void *tret = NULL;
+ int seq = (int)u;
+
+ for (i = 0; i < ITERS / NUM; i++)
+ {
+ struct timespec ts;
+
+ if ((ret = clock_gettime(CLOCK_REALTIME, &ts)) != 0)
+ {
+ tret = (void *)1;
+ printf ("%u:clock_gettime failed: %s\n", seq, strerror (errno));
+ goto out;
+ }
+ ts.tv_sec += 20;
+
+ if ((ret = pthread_mutex_lock (&mutex)) != 0)
+ {
+ tret = (void *)1;
+ printf ("waiter[%u]:mutex_lock failed: %s\n", seq, strerror (ret));
+ goto out;
+ }
+ pthread_cleanup_push (cleanup, NULL);
+
+ /* We should not time out either. */
+ if ((ret = pthread_cond_timedwait (&cond, &mutex, &ts)) != 0)
+ {
+ tret = (void *)1;
+ printf ("waiter[%u]:timedwait failed: %s\n", seq, strerror (ret));
+ goto unlock_out;
+ }
+ if ((ret = pthread_mutex_unlock (&mutex)) != 0)
+ {
+ tret = (void *)1;
+ printf ("waiter[%u]:mutex_unlock failed: %s\n", seq, strerror (ret));
+ goto out;
+ }
+ pthread_cleanup_pop (0);
+ }
+
+out:
+ puts ("timed_waiter tests done");
+ return tret;
+
+unlock_out:
+ if ((ret = pthread_mutex_unlock (&mutex)) != 0)
+ printf ("waiter[%u]:mutex_unlock[2] failed: %s\n", seq, strerror (ret));
+ goto out;
+}
+
+int
+do_test_wait (thr_func f)
+{
+ pthread_t w[NUM];
+ pthread_t s;
+ pthread_mutexattr_t attr;
+ int i, j, ret = 0;
+ void *thr_ret;
+
+ for (i = 0; i < COUNT; i++)
+ {
+ if ((ret = pthread_mutexattr_init (&attr)) != 0)
+ {
+ printf ("mutexattr_init failed: %s\n", strerror (ret));
+ goto out;
+ }
+
+ if ((ret = pthread_mutexattr_setprotocol (&attr, PTHREAD_PRIO_INHERIT)) != 0)
+ {
+ printf ("mutexattr_setprotocol failed: %s\n", strerror (ret));
+ goto out;
+ }
+
+ if ((ret = pthread_cond_init (&cond, NULL)) != 0)
+ {
+ printf ("cond_init failed: %s\n", strerror (ret));
+ goto out;
+ }
+
+ if ((ret = pthread_mutex_init (&mutex, &attr)) != 0)
+ {
+ printf ("mutex_init failed: %s\n", strerror (ret));
+ goto out;
+ }
+
+ for (j = 0; j < NUM; j++)
+ if ((ret = pthread_create (&w[j], NULL, f, (void *)j)) != 0)
+ {
+ printf ("waiter[%d]: create failed: %s\n", j, strerror (ret));
+ goto out;
+ }
+
+ if ((ret = pthread_create (&s, NULL, signaller, NULL)) != 0)
+ {
+ printf ("signaller: create failed: %s\n", strerror (ret));
+ goto out;
+ }
+
+ for (j = 0; j < NUM; j++)
+ {
+ if ((ret = pthread_cancel (w[j])) != 0)
+ {
+ printf ("waiter[%d]: cancel failed: %s\n", j, strerror (ret));
+ goto out;
+ }
+
+ if ((ret = pthread_join (w[j], &thr_ret)) != 0)
+ {
+ printf ("waiter[%d]: join failed: %s\n", j, strerror (ret));
+ goto out;
+ }
+
+ if (thr_ret != NULL && thr_ret != PTHREAD_CANCELED)
+ {
+ ret = 1;
+ goto out;
+ }
+ }
+
+ /* The signalling thread could have ended before it was cancelled. */
+ pthread_cancel (s);
+
+ if ((ret = pthread_join (s, &thr_ret)) != 0)
+ {
+ printf ("signaller: join failed: %s\n", strerror (ret));
+ goto out;
+ }
+
+ if (thr_ret != NULL && thr_ret != PTHREAD_CANCELED)
+ {
+ ret = 1;
+ goto out;
+ }
+ }
+
+out:
+ return ret;
+}
+
+int
+do_test (int argc, char **argv)
+{
+ int ret = do_test_wait (waiter);
+
+ if (ret)
+ return ret;
+
+ return do_test_wait (timed_waiter);
+}
+
+#define TIMEOUT 5
+#include "../test-skeleton.c"

11
glibc.spec
View File

@ -27,7 +27,7 @@
Summary: The GNU libc libraries
Name: glibc
Version: %{glibcversion}
Release: 20%{?dist}
Release: 21%{?dist}
# GPLv2+ is used in a bunch of programs, LGPLv2+ is used for libraries.
# Things that are linked directly into dynamically linked programs
# and shared libraries (e.g. crt files, lib*_nonshared.a) have an additional
@ -188,6 +188,9 @@ Patch2028: %{name}-rh767693-2.patch
# Upstream BZ 14417
Patch2061: %{name}-rh552960.patch
# Upstream BZ 14652
Patch2062: %{name}-rh552960-2.patch
Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
Obsoletes: glibc-profile < 2.4
Obsoletes: nss_db
@ -472,6 +475,7 @@ package or when debugging this package.
%patch0059 -p1
%patch0060 -p1
%patch2061 -p1
%patch2062 -p1
# On powerpc32, hp timing is only available in power4/power6
# libs, not in base, so pre-power4 dynamic linker is incompatible
@ -1266,7 +1270,10 @@ rm -f *.filelist*
%endif
%changelog
* Mon Oct 2 2012 Jeff Law <law@redhat.com> - 2.16.90-20
* Thu Oct 4 2012 Siddhesh Poyarekar <siddhesh@redhat.com> - 2.16.90-21
- Take mutex in cleanup only if it is not already taken.
* Tue Oct 2 2012 Jeff Law <law@redhat.com> - 2.16.90-20
- Resync with upstream sources.
- Repack patchlist.