Hello,
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.
Greetings
Helge
--
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>
#else
#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);
}
#endif
static void usage(void)
{
fprintf(stderr,
"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");
exit(1);
}
void trap_unaligned(void)
{
unsigned int buf[2];
buf[0] = SSIN_UACPROC;
buf[1] = UAC_SIGBUS | UAC_NOPRINT;
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) {
usage();
}
trap_unaligned();
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",
tmp_filename,
strerror(errno));
}
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");
#ifndef NOAUTORUN
fprintf(tmp_file, "run\n");
#endif
fclose(tmp_file);
printf("Extra arguments passed to gdb in file %s.\n"
"Be sure to delete it when you're done.\n\n",
tmp_filename);
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));
usage();
}
/* 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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