Attachment 147098 Details for Bug 226745 – Parent in D-state, child is TASK_STOPPED

Parent in D-state, child is TASK_STOPPED

expl_zap1.c (text/plain), 1.09 KB, created by Alexey Dobriyan on 2007-02-01 13:45:25 UTC

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Creator: Alexey Dobriyan

Created: 2007-02-01 13:45:25 UTC

Size: 1.09 KB

patch

obsolete

>/*
> * So we are doing force_sig_specific(SIGKILL, p) + __ptrace_unlink(p).
> * Neither of them clears ->exit_code or SIGNAL_STOP_DEQUEUED, if 'p'
> * did ptrace_stop() it goes to do_signal_stop() and this program hangs.
> *
> * Parent sleeps in 'D' state, child is TASK_STOPPED, you need to SIGKILL
> * the child manually.
> */
>
>#include <errno.h>
>#include <stdio.h>
>#include <signal.h>
>#include <string.h>
>#include <stdlib.h>
>#include <unistd.h>
>#include <pthread.h>
>#include <sys/wait.h>
>#include <sys/ptrace.h>
>#include <sys/syscall.h>
>
>void die(const char *msg)
>{
>	printf("ERR!! %s: %s\n", msg, strerror(errno));
>	exit(-1);
>}
>
>#define clone_vm(func, stack)					\
>({								\
>	int pid = clone(func, stack + sizeof(stack) / 2,	\
>			CLONE_VM, NULL);			\
>								\
>	if (pid < 0)						\
>		die("clone");					\
>								\
>	pid;							\
>})
>
>char child_stack[4096];
>
>int child_func(void *arg)
>{
>	return pause();
>}
>
>int main(void)
>{
>	int pid = clone_vm(child_func, child_stack);
>
>	if (ptrace(PTRACE_ATTACH, pid, NULL, 0))
>		die("ptrace");
>
>	usleep(100000);		// wait4 doesn't like WNOWAIT
>
>	kill(getpid(), SIGQUIT);
>
>	return 0;
>}

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Attachments on bug 226745: 147098