Messages in this thread |  | | Date | Wed, 5 Jun 1996 22:53:36 -0400 (EDT) | From | Ingo Molnar <> | Subject | showstopper, mmap()+read(), pre2.0.12 |
| |
i guess it's well known, but anyways, i've simplified down the "grep .." problem to the following code. It locks up my machine very reliably, old kernels like 1.3.64 too:
[ sometimes it locks up with interrupts turned off, sometimes the kernel loops in __get_free_page() (?) i think ]:
[ can provide more info but i guess this is enough ]:
[ N has to be bigger than mem+swap ]
---------- cut here ----------------> #include <unistd.h> #include <stdio.h> #include <sys/mman.h> #include <fcntl.h>
#define N 83894272
int main( void ) { int fd; void * map; fd=open("/dev/zero",O_RDONLY);
map = mmap( 0, N, PROT_READ|PROT_WRITE, MAP_PRIVATE|0x20, fd, 0);
read( fd, map, N);
return(0); }
|  |