Date: Wed, 13 Nov 2013 13:25:19 GMT From: Howard Su <howard0su@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: arm/183926: Crash when ctrl-c while process is enter Message-ID: <201311131325.rADDPJKL077353@oldred.freebsd.org> Resent-Message-ID: <201311131330.rADDU0oh081563@freefall.freebsd.org>
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>Number: 183926
>Category: arm
>Synopsis: Crash when ctrl-c while process is enter
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-arm
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Nov 13 13:30:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator: Howard Su
>Release: -Current
>Organization:
>Environment:
FreeBSD beaglebone 11.0-CURRENT FreeBSD 11.0-CURRENT #9 42a79a9(dtrace_arm)-dirty: Tue Nov 12 21:56:17 CST 2013 howardsu@FreeBSD:/usr/home/howardsu/usr/obj/arm.armv6/usr/home/howardsu/usr/freebsd/sys/BEAGLEBONE arm
>Description:
consistent repro a crash related signal deliver and mutex/cond operation in arm platform.
I notice this when I was play with dtrace arm port from gonozo. the _sleep function is a simpler version of dtrace_sleep in libdtrace. In case you need a real case, please refer that file @ cddl/contrib/opensolaris/lib/libdtrace/dt_work.c.
>How-To-Repeat:
Compile and run the attached C code.
Press Ctrl-C when shows "enter".
>Fix:
Patch attached with submission follows:
#include <stdio.h>
#include <pthread.h>
#include <signal.h>
pthread_cond_t cv;
pthread_mutex_t lock;
pthread_condattr_t ca;
pthread_mutexattr_t ma;
int done = 0;
void _sleep()
{
struct timespec tv;
clock_gettime(CLOCK_REALTIME,&tv);
tv.tv_sec += 1;
tv.tv_nsec = 0;
(void) pthread_mutex_lock(&lock);
(void) pthread_cond_timedwait(&cv, &lock, &tv);
(void) pthread_mutex_unlock(&lock);
}
static void
intr(int signo)
{
done++;
}
int main()
{
struct sigaction act;
pthread_condattr_init(&ca);
pthread_mutexattr_init(&ma);
pthread_mutex_init(&lock, &ma);
pthread_cond_init(&cv, &ca);
(void) sigemptyset(&act.sa_mask);
act.sa_flags = 0;
act.sa_handler = intr;
(void) sigaction(SIGINT, &act, NULL);
while(!done)
{
printf("enter\n");
_sleep();
printf("exit\n");
}
printf("done\n");
return 0;
}
>Release-Note:
>Audit-Trail:
>Unformatted:
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