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Subjectstress test; kill(-1,...)
Date

Should'nt this program terminate safely ? While its running the
machine is unusable but after the kill -1, I'm expecting all children to
die and everything to return to normal. It works as expected if
the "malloc(1000000)" isn't there.

This always renders the machine unusable, have to hit reset.

#include <stdio.h>
#include <stdlib.h>
#include <linux/kernel.h>
#include <linux/sys.h>
#include <signal.h>
#include <unistd.h>

main()
{
int i;

if (fork()) {
sleep(10);
fprintf(stderr, "%d\n", kill(-1, SIGTERM));
} else {
for (i = 0; i < 100; i++) {
malloc(1000000);
fork();
}
}
}

With just the for loop (no kill)

for (i = 0; i < 100; i++) {
malloc(1000000);
fork();
}

If I try a shutdown or a killall from some other terminal the log/console fills
up with:

socrates kernel: swap_free: swap-space map bad (entry 00038700)
socrates kernel: swap_duplicate: trying to duplicate unused page
socrates last message repeated 2 times
socrates kernel: swap_free: swap-space map bad (entry 00038700)
socrates kernel: swap_duplicate: trying to duplicate unused page
socrates last message repeated 3 times
socrates kernel: Hmm.. Trying to use unallocated swap (00038700)
socrates last message repeated 8 times
socrates kernel: swap_free: swap-space map bad (entry 00038700)
socrates last message repeated 4 times
socrates kernel: swap_duplicate: trying to duplicate unused page
socrates last message repeated 3 times
socrates kernel: Hmm.. Trying to use unallocated swap (00038700)
socrates kernel: swap_free: swap-space map bad (entry 00038700)
socrates kernel: Hmm.. Trying to use unallocated swap (00038700)
socrates kernel: swap_free: swap-space map bad (entry 00038700)
socrates kernel: Hmm.. Trying to use unallocated swap (00038700)

This is not always reproducible, you have to play with it for a while.

Machine: linux 1.3.89, P90 PCI, 24M RAM + 50M Swap. The kernel has
essential stuff + profiling turned on and everything else is a module:

# lsmod
Module: #pages: Used by:
nfs 13 7 (autoclean)
smc-ultra 1 1 (autoclean)
8390 2 [smc-ultra] 0 (autoclean)
msdos 2 1 (autoclean)
fat 6 [msdos] 1 (autoclean)

No X.
--
Raghavan Menon <rmenon@tisl.ukans.edu>
Electrical Engineering, University of Kansas


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