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Red Hat Bugzilla – Attachment 159495 Details for
Bug 248671
[RHEL4] pthreads deadlock with setuid
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sample program
ths.c (text/plain), 787 bytes, created by
Mikhail Kruk
on 2007-07-18 03:59:55 UTC
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Description:
sample program
Filename:
MIME Type:
Creator:
Mikhail Kruk
Created:
2007-07-18 03:59:55 UTC
Size:
787 bytes
patch
obsolete
>#include <pthread.h> >#include <errno.h> > >#define NUM_THREADS 100 >#define ITERS 1000 > >void * thread_func(void *arg) >{ > setuid(500); > return 0; >} > >int main() >{ > pthread_t threads[NUM_THREADS]; > int i, j; > int result; > char buf[32]; > int count; > > for (j = 0; j < ITERS; j++) > { > for (i = 0; i < NUM_THREADS; i++) > { > pthread_create(&(threads[i]), NULL, thread_func, NULL); > } > > printf("launched threads, iter %d\n", j); > > do > { > count = 0; > for (i = 0; i < NUM_THREADS; i++) > { > if (threads[i] == -1) continue; > int ret = pthread_kill(threads[i], 0); > if (ret == 0) > count++; > else > { > pthread_join(threads[i], (void *)&result); > threads[i] = -1; > } > } > sleep(1); > } > while (count > 0); > > printf("joined threads\n"); > } > > return 0; >}
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