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Re: bzip2 unaligned trap

On Thu, Aug 25, 2005 at 10:26:21AM +0200, Falk Hueffner wrote:
> Steve Langasek <vorlon@debian.org> writes:
> > Rather, do not expect this to be fixed unless you can convert the
> > kernel-level trap into a userspace backtrace that the developers can
> > act on.
> I'd say that's the maintainer's job, not the bug reporter's. So please
> report it :-)

Well, if the submitter can produce such a backtrace, chances are much
higher to get it fixed and not simply ignored. 

For reference, I attached the programm I used in the past and which I got
from this (or the Red Hat) list.


Dr. Helge Kreutzmann, Dipl.-Phys.           Helge.Kreutzmann@itp.uni-hannover.de
                       gpg signed mail preferred 
    64bit GNU powered                  http://www.itp.uni-hannover.de/~kreutzm
          Help keep free software "libre": http://www.ffii.de/
#include <errno.h>
#include <stdio.h>

#ifndef __linux__
#include <sys/sysinfo.h>
#include <asm/sysinfo.h>
#include <asm/unistd.h>

static int setsysinfo(unsigned long op, void *buffer, unsigned long size,
		      int *start, void *arg, unsigned long flag)
  syscall(__NR_osf_setsysinfo, op, buffer, size, start, arg, flag);

static void usage(void)
		"usage: unaligned  <command-path> [command-args...]\n\n"
		"  This program is designed to assist debugging of\n"
		"  unaligned traps by running the program in gdb\n"
		"  and causing it to get SIGBUS when it encounters\n"
		"  an unaligned trap.\n\n"
		"  It is free software written by Sean Hunter <sean@uncarved.co.uk>\n"
		"  based on code by Richard Henderson and Andrew Morgan.  It is provided\n"
		"  under the gnu public license without warrantees of any kind.\n\n");


void trap_unaligned(void)
  unsigned int buf[2];
  buf[0] = SSIN_UACPROC;
  setsysinfo(SSI_NVPAIRS, buf, 1, 0, 0, 0);


int main(int argc, char **argv)
    char* tmp_filename;
    char* my_debugger = "/usr/bin/gdb";
    FILE* tmp_file;
    int curr_arg;

    /* check that we have at least 1 argument */
    if (argc < 2) {


    if (argc > 2) {
        /* add the extra args to a file to pass to gdb */
        tmp_filename = tmpnam(NULL);
	tmp_file = fopen(tmp_filename, "w+");
	if (!tmp_file) {
    	    fprintf(stderr, "Unable to create temp file %s reason: %s\n", 

	fprintf(tmp_file, "file %s\n", argv[1]);
	fprintf(tmp_file, "set args");
	for(curr_arg = 2; curr_arg < argc; curr_arg++) {
	    fprintf(tmp_file, " %s", argv[curr_arg]);
	fprintf(tmp_file, "\n");
	fprintf(tmp_file, "run\n");

	printf("Extra arguments passed to gdb in file %s.\n"
	       "Be sure to delete it when you're done.\n\n",
        execlp(my_debugger, argv[1], "-x", tmp_filename, NULL);

    else {
	execlp(my_debugger, argv[1], NULL);

    /* if we fall through to here, our exec failed -- announce the fact */
    fprintf(stderr, "Unable to execute command: %s\n", strerror(errno));



/* use gcc unaligned.c -o unaliged to compile.  Add -DNOAUTORUN if you
don't want gdb to automatically run the program */

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