Date: Sat, 4 Jan 2003 17:03:16 -0500 (EST) From: Robert Watson <rwatson@FreeBSD.org> To: current@FreeBSD.org Cc: jmallett@FreeBSD.org Subject: pthread ^T problem on recent -CURRENT: death in libc_r mutex Message-ID: <Pine.NEB.3.96L.1030104170009.82416C-100000@fledge.watson.org>
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Juli Mallett pointed me at the following reproduceable problem on my
-current notebook with userland/kernel dated Dec 29:
paprika:~/freebsd/test/pthread> ./test
1
2
1
2
1
2
load: 0.02 cmd: test 910 [running] 0.00u 0.01s 0% 824k
1
Bus error (core dumped)
paprika:~/freebsd/test/pthread> ./test
1
2
load: 0.23 cmd: test 914 [running] 0.00u 0.01s 0% 824k
1
Bus error (core dumped)
Hitting ^T to get status information seems to break output following the
first printf after the information display. Here's the stack trace from
the test program from the first execution above:
(gdb) bt
#0 0x2807a559 in _pthread_mutex_trylock () from /usr/lib/libc_r.so.5
#1 0x2807a71c in _pthread_mutex_lock () from /usr/lib/libc_r.so.5
#2 0x2813598f in flockfile () from /usr/lib/libc.so.5
#3 0x2812bfd0 in vfprintf () from /usr/lib/libc.so.5
#4 0x2811a552 in printf () from /usr/lib/libc.so.5
#5 0x0804860d in thread2 (arg=0x0) at test.c:22
#6 0x280732ce in _thread_start () from /usr/lib/libc_r.so.5
The program source is attached below.
Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org Network Associates Laboratories
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
void *
thread1(void *arg)
{
while (1) {
sleep(2);
printf("1\n");
}
}
void *
thread2(void *arg)
{
sleep(1);
while (1) {
sleep(2);
printf("2\n");
}
}
int
main(int argc, char *argv[]) {
pthread_t t1, t2;
int error;
error = pthread_create(&t1, NULL, thread1, NULL);
error = pthread_create(&t2, NULL, thread2, NULL);
error = pthread_join(t1, NULL);
error = pthread_join(t2, NULL);
return (0);
}
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