Messages in this thread |  | | Date | Thu, 30 May 1996 13:26:38 +0600 (GMT) | From | Alexey Yakovlev <> | Subject | Re: MM bug |
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On Wed, 29 May 1996, Regis DUCHESNE wrote:
> > You can simply crash the system by issuing "grep any_string /dev/zero". > > As the lines in /dev/zero have infinite length, grep tries to allocate still more > > memory for its line buffer until the memory is exhausted. But no out of memory > > message appear and the system gets frozen (interrupts work, but normal processes > > Yes, my system crashes too. > > Is this a kernel or a grep problem? > (i'm running gnu_grep-2.0 and pre-2.0.4) >
It is sertainly not the grep problem because system can hang with other programs. Just write small test program which has huge BSS in it. Say,
char a[128*1024*1024];
main() { }
Nothing happens to this program when it starts. Top shows it is 128M large. But if you insert some loop into the code which makes use of the huge array:
#define LENGTH 128*1024*1024 char a[LENGTH];
main() { int i; for( i=0, i< LENGTH; i++) a[i] = '\0'; }
the program works some time and then stops responding and the only way out is to press Reset. At least, this is true for my box.
Disclaimer: YOU ARE ON YOUR OWN IF TRY THIS.
Good luck. Alexey
================================================================ Alexey Yakovlev, Quantum Chemistry lab. Boreskov Institute of Catalysis, Russian Academy of Sciences pr. Lavrentieva 5, 630090 Novosibirsk, Russia phone: +7-(3832)-350264, fax: +7-(3832)-355766 e-mail: jack@catalysis.nsk.su ================================================================
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