Re: [parisc-linux] Re: gsyprf11 and 2.6.13-rc3-pa1

[Randolph Chung <randolph@tausq.org>]

Can somebody with a 32-bit machine try this slightly modified test case?
In the presence of a signal handler for SIGSEGV, the program will loop
segfaulting because there's not enough stack space left for the signal
handler. On an a500, this program just loops, but perhaps on a 32-bit
machine it crashes the machine if run long enough. Seems to suggest a
problem in our kernel entry/exit paths?

randolph

================================================================

#include <stdio.h>
#include <signal.h>
#include <stdlib.h>

char *stack_base_estimate;

static void sighandler(int sig)
{
        printf("Got signal %d\n", sig);
        exit(0);
}

void
recurse(void)
{
        char a[256];

        memset(a, '\0', sizeof(*a));
        printf("Estimating stack consumed 0x%lx\n",
               (unsigned long)(a - stack_base_estimate));
        recurse();
}

int
main(int argc, char *argv[])
{
        char b;

        signal(SIGSEGV, sighandler);

        stack_base_estimate = &b;
        printf("Estimating stack base at 0x%p\n", stack_base_estimate);
        recurse();
        return 0;
}

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