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[src/trunk]: src/tests/lib/libc/sys Rewrite the t_ptrace_wait resume1 test
details: https://anonhg.NetBSD.org/src/rev/2bb9220d802e
branches: trunk
changeset: 744710:2bb9220d802e
user: kamil <kamil%NetBSD.org@localhost>
date: Tue Feb 11 00:41:37 2020 +0000
description:
Rewrite the t_ptrace_wait resume1 test
Switch to pthread functions.
Rename to 'resume'.
Synchronize the threads with pthread barriers.
Avoid race in the test.
Test passes correctly.
Fixes PR bin/54893 by Andreas Gustafsson
diffstat:
tests/lib/libc/sys/t_ptrace_wait.c | 149 ++++++++++++++++++------------------
tests/lib/libc/sys/t_ptrace_wait.h | 7 +-
2 files changed, 79 insertions(+), 77 deletions(-)
diffs (285 lines):
diff -r 1a7fe0cabdfa -r 2bb9220d802e tests/lib/libc/sys/t_ptrace_wait.c
--- a/tests/lib/libc/sys/t_ptrace_wait.c Mon Feb 10 23:21:42 2020 +0000
+++ b/tests/lib/libc/sys/t_ptrace_wait.c Tue Feb 11 00:41:37 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: t_ptrace_wait.c,v 1.154 2020/02/10 11:42:41 kamil Exp $ */
+/* $NetBSD: t_ptrace_wait.c,v 1.155 2020/02/11 00:41:37 kamil Exp $ */
/*-
* Copyright (c) 2016, 2017, 2018, 2019 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ptrace_wait.c,v 1.154 2020/02/10 11:42:41 kamil Exp $");
+__RCSID("$NetBSD: t_ptrace_wait.c,v 1.155 2020/02/11 00:41:37 kamil Exp $");
#define __LEGACY_PT_LWPINFO
@@ -7317,44 +7317,44 @@
/// ----------------------------------------------------------------------------
-volatile lwpid_t the_lwp_id = 0;
-
-static void
-lwp_main_stop(void *arg)
+static pthread_barrier_t barrier1_resume;
+static pthread_barrier_t barrier2_resume;
+
+static void *
+resume_thread(void *arg)
{
- the_lwp_id = _lwp_self();
-
- raise(SIGTRAP);
-
- _lwp_exit();
-}
-
-ATF_TC(resume1);
-ATF_TC_HEAD(resume1, tc)
+
+ raise(SIGUSR1);
+
+ pthread_barrier_wait(&barrier1_resume);
+
+ /* Debugger will suspend the process here */
+
+ pthread_barrier_wait(&barrier2_resume);
+
+ raise(SIGUSR2);
+
+ return infinite_thread(arg);
+}
+
+ATF_TC(resume);
+ATF_TC_HEAD(resume, tc)
{
atf_tc_set_md_var(tc, "descr",
"Verify that a thread can be suspended by a debugger and later "
"resumed by the debugger");
}
-ATF_TC_BODY(resume1, tc)
+ATF_TC_BODY(resume, tc)
{
- struct msg_fds fds;
- const int exitval = 5;
const int sigval = SIGSTOP;
pid_t child, wpid;
- uint8_t msg = 0xde; /* dummy message for IPC based on pipe(2) */
#if defined(TWAIT_HAVE_STATUS)
int status;
#endif
- ucontext_t uc;
lwpid_t lid;
- static const size_t ssize = 16*1024;
- void *stack;
- struct ptrace_lwpinfo pl;
struct ptrace_siginfo psi;
-
- SYSCALL_REQUIRE(msg_open(&fds) == 0);
+ pthread_t t;
DPRINTF("Before forking process PID=%d\n", getpid());
SYSCALL_REQUIRE((child = fork()) != -1);
@@ -7362,31 +7362,20 @@
DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
+ pthread_barrier_init(&barrier1_resume, NULL, 2);
+ pthread_barrier_init(&barrier2_resume, NULL, 2);
+
DPRINTF("Before raising %s from child\n", strsignal(sigval));
FORKEE_ASSERT(raise(sigval) == 0);
- DPRINTF("Before allocating memory for stack in child\n");
- FORKEE_ASSERT((stack = malloc(ssize)) != NULL);
-
- DPRINTF("Before making context for new lwp in child\n");
- _lwp_makecontext(&uc, lwp_main_stop, NULL, NULL, stack, ssize);
-
- DPRINTF("Before creating new in child\n");
- FORKEE_ASSERT(_lwp_create(&uc, 0, &lid) == 0);
-
- CHILD_TO_PARENT("Message", fds, msg);
-
- raise(SIGINT);
-
- DPRINTF("Before waiting for lwp %d to exit\n", lid);
- FORKEE_ASSERT(_lwp_wait(lid, NULL) == 0);
-
- DPRINTF("Before verifying that reported %d and running lid %d "
- "are the same\n", lid, the_lwp_id);
- FORKEE_ASSERT_EQ(lid, the_lwp_id);
-
- DPRINTF("Before exiting of the child process\n");
- _exit(exitval);
+ DPRINTF("Before creating new thread in child\n");
+ FORKEE_ASSERT(pthread_create(&t, NULL, resume_thread, NULL) == 0);
+
+ pthread_barrier_wait(&barrier1_resume);
+
+ pthread_barrier_wait(&barrier2_resume);
+
+ infinite_thread(NULL);
}
DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);
@@ -7400,10 +7389,10 @@
SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
DPRINTF("Before calling %s() for the child - expected stopped "
- "SIGTRAP\n", TWAIT_FNAME);
+ "SIGUSR1\n", TWAIT_FNAME);
TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
- validate_status_stopped(status, SIGTRAP);
+ validate_status_stopped(status, SIGUSR1);
DPRINTF("Before reading siginfo and lwpid_t\n");
SYSCALL_REQUIRE(ptrace(PT_GET_SIGINFO, child, &psi, sizeof(psi)) != -1);
@@ -7411,52 +7400,60 @@
DPRINTF("Before suspending LWP %d\n", psi.psi_lwpid);
SYSCALL_REQUIRE(ptrace(PT_SUSPEND, child, NULL, psi.psi_lwpid) != -1);
- PARENT_FROM_CHILD("Message", fds, msg);
+ lid = psi.psi_lwpid;
+
+ DPRINTF("Before resuming the child process where it left off and "
+ "without signal to be sent\n");
+ SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+ DPRINTF("Before suspending the parent for 1 second, we expect no signals\n");
+ SYSCALL_REQUIRE(sleep(1) == 0);
+
+#if defined(TWAIT_HAVE_OPTIONS)
+ DPRINTF("Before calling %s() for the child - expected no status\n",
+ TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, WNOHANG), 0);
+#endif
+
+ DPRINTF("Before resuming the child process where it left off and "
+ "without signal to be sent\n");
+ SYSCALL_REQUIRE(ptrace(PT_STOP, child, NULL, 0) != -1);
+
+ DPRINTF("Before calling %s() for the child - expected stopped "
+ "SIGSTOP\n", TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+ validate_status_stopped(status, SIGSTOP);
+
+ DPRINTF("Before resuming LWP %d\n", lid);
+ SYSCALL_REQUIRE(ptrace(PT_RESUME, child, NULL, lid) != -1);
DPRINTF("Before resuming the child process where it left off and "
"without signal to be sent\n");
SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
DPRINTF("Before calling %s() for the child - expected stopped "
- "SIGINT\n", TWAIT_FNAME);
+ "SIGUSR2\n", TWAIT_FNAME);
TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
- validate_status_stopped(status, SIGINT);
-
- pl.pl_lwpid = 0;
-
- SYSCALL_REQUIRE(ptrace(PT_LWPINFO, child, &pl, sizeof(pl)) != -1);
- while (pl.pl_lwpid != 0) {
- SYSCALL_REQUIRE(ptrace(PT_LWPINFO, child, &pl, sizeof(pl)) != -1);
- switch (pl.pl_lwpid) {
- case 1:
- ATF_REQUIRE_EQ(pl.pl_event, PL_EVENT_SIGNAL);
- break;
- case 2:
- ATF_REQUIRE_EQ(pl.pl_event, PL_EVENT_SUSPENDED);
- break;
- }
- }
-
- DPRINTF("Before resuming LWP %d\n", psi.psi_lwpid);
- SYSCALL_REQUIRE(ptrace(PT_RESUME, child, NULL, psi.psi_lwpid) != -1);
+ validate_status_stopped(status, SIGUSR2);
DPRINTF("Before resuming the child process where it left off and "
"without signal to be sent\n");
- SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+ SYSCALL_REQUIRE(ptrace(PT_KILL, child, (void *)1, 0) != -1);
DPRINTF("Before calling %s() for the child - expected exited\n",
TWAIT_FNAME);
TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
- validate_status_exited(status, exitval);
+ validate_status_signaled(status, SIGKILL, 0);
DPRINTF("Before calling %s() for the child - expected no process\n",
TWAIT_FNAME);
TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
-
- msg_close(&fds);
-}
+}
+
+/// ----------------------------------------------------------------------------
ATF_TC(syscall1);
ATF_TC_HEAD(syscall1, tc)
@@ -9261,7 +9258,7 @@
ATF_TP_ADD_TC(tp, suspend_no_deadlock);
- ATF_TP_ADD_TC(tp, resume1);
+ ATF_TP_ADD_TC(tp, resume);
ATF_TP_ADD_TC(tp, syscall1);
diff -r 1a7fe0cabdfa -r 2bb9220d802e tests/lib/libc/sys/t_ptrace_wait.h
--- a/tests/lib/libc/sys/t_ptrace_wait.h Mon Feb 10 23:21:42 2020 +0000
+++ b/tests/lib/libc/sys/t_ptrace_wait.h Tue Feb 11 00:41:37 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: t_ptrace_wait.h,v 1.18 2019/11/12 18:18:04 kamil Exp $ */
+/* $NetBSD: t_ptrace_wait.h,v 1.19 2020/02/11 00:41:37 kamil Exp $ */
/*-
* Copyright (c) 2016, 2017, 2018, 2019 The NetBSD Foundation, Inc.
@@ -73,18 +73,21 @@
# define TWAIT_GENERIC(a,b,c) waitpid((a),(b),(c))
# define TWAIT_HAVE_PID 1
# define TWAIT_HAVE_STATUS 1
+# define TWAIT_HAVE_OPTIONS 1
#elif defined(TWAIT_WAITID)
# define TWAIT_FNAME "waitid"
# define TWAIT_GENERIC(a,b,c) \
waitid(P_PID,(a),NULL,(c)|WEXITED|WTRAPPED)
# define TWAIT_WAIT6TYPE(a,b,c,d,e,f) waitid((a),(b),(f),(d))
# define TWAIT_HAVE_PID 1
+# define TWAIT_HAVE_OPTIONS 1
#elif defined(TWAIT_WAIT3)
# define TWAIT_FNAME "wait3"
# define TWAIT_WAIT4TYPE(a,b,c,d) wait3((b),(c),(d))
# define TWAIT_GENERIC(a,b,c) wait3((b),(c),NULL)
# define TWAIT_HAVE_STATUS 1
# define TWAIT_HAVE_RUSAGE 1
+# define TWAIT_HAVE_OPTIONS 1
#elif defined(TWAIT_WAIT4)
# define TWAIT_FNAME "wait4"
# define TWAIT_WAIT4TYPE(a,b,c,d) wait4((a),(b),(c),(d))
@@ -92,6 +95,7 @@
# define TWAIT_HAVE_PID 1
# define TWAIT_HAVE_STATUS 1
# define TWAIT_HAVE_RUSAGE 1
+# define TWAIT_HAVE_OPTIONS 1
#elif defined(TWAIT_WAIT6)
# define TWAIT_FNAME "wait6"
# define TWAIT_WAIT6TYPE(a,b,c,d,e,f) wait6((a),(b),(c),(d),(e),(f))
@@ -99,6 +103,7 @@
wait6(P_PID,(a),(b),(c)|WEXITED|WTRAPPED,NULL,NULL)
# define TWAIT_HAVE_PID 1
# define TWAIT_HAVE_STATUS 1
+# define TWAIT_HAVE_OPTIONS 1
#endif
/*
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