Here is a simpler example program:
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <wait.h>
int
main(argc, argv)
int argc;
char **argv;
{
int pid, rpid;
int st;
if (argc < 2) {
fprintf(stderr, "usage: %s command ...\n", argv[0]);
return (1);
}
if ((pid = fork()) < 0) {
fprintf(stderr, "fork: %s\n", strerror(errno));
return (1);
}
if (pid == 0) {
execvp(argv[1], &argv[1]);
fprintf(stderr, "exec: %s\n", strerror(errno));
return (1);
}
while ((rpid = wait(&st)) > 0 && rpid != pid)
;
if (rpid < 0) {
fprintf(stderr, "wait: %s\n", strerror(errno));
return (1);
}
printf("status 0x%x\n", st);
return (0);
}
There is some header-file fumble that prevents me from compiling this
with cc -m32, but there are both 32- and 64-bit systems in our
environment, so:
Using kernel 3.13.0-59:
Compile it on a 64-bit system, and run
./forkexec date
and all is well.
Compile it on a 32-bit system, then, on a 64-bit system, run
./forkexec date
and date prints nothing, while forkexec reports exit status 0x8b.
On the other hand, still on the 64-bit system, point it at a 32-bit binary and
all is well. e.g.
./forkexec ./forkexec
just prints the expected usage: message, so it execed itself properly; no
SIGSEGV.
To confound matters further:
-- take out the fork (so the program just calls exec) and all is well
-- run the program under strace -f and the problem vanishes
All this happens under kernel 3.13.0-59 but not 3.13.0-55 (we've put off
a few updates).
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https://bugs.launchpad.net/bugs/1479093
Title:
Segfault in ld-2.19.so while starting Steam after upgrade to
3.13.0-59.98
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