ADDR_COMPAT_LAYOUT breaks PTRACE_SEIZE

From: Andreas Schwab
Date: Sun Mar 22 2015 - 11:39:52 EST


On ppc64, a process running with the ADDR_COMPAT_LAYOUT personality
causes ptrace(PTRACE_SEIZE) to hang in the kernel, unkillable.

#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/personality.h>
#include <sys/ptrace.h>
#include <sys/wait.h>

int
main (void)
{
pid_t child;

personality (ADDR_COMPAT_LAYOUT);
child = fork ();
if (child == 0)
{
kill (getpid (), SIGSTOP);
exit (0);
}

ptrace (PTRACE_SEIZE, child, NULL, NULL);
wait (NULL);
ptrace (PTRACE_CONT, child, NULL, NULL);
}

Andreas.

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