I have a smaller test case (4 system calls, and a memset), that causes the test case to hang in an
unkillable state*, and makes the system load consume an entire CPU.
*the process is killable if run under strace, but the system load does not drop when the strace is
killed.
Pass this the name of a target file on an NFS mount.
(tested to fail on 2.6.15-rc1).
-Kenny
Here is the test:
#define _GNU_SOURCE
#include <fcntl.h>
#include <stdio.h>
#include <strind.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
int main(int argc, char* argv[])
{
if (argc != 2) {
printf("usage: %0 <filename>\n", argv[0]);
return 0;
}
{
int fd = open(argv[1], O_RDWR | O_CREAT | O_LARGEFILE | O_DIRECT, 0644);
if (fd < 0) {
perror("open");
return 0;
}
int window_size = 2 * 1024 * 1024;
long long file_size = window_size;
/* fast-forward */
file_size += 2047u * (2 * 1024 * 1024);
file_size += window_size + window_size;
/* grow file */
pwrite64(fd, "", 1, file_size);
{
char* mapping_start = (char*)mmap64(0, window_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fd, file_size - window_size);
/* test only fails with this: */
memset(mapping_start, 0, window_size);
}
/* grow file */
file_size += window_size;
/* this never returns */
pwrite64(fd, "", 1, file_size);
}
return 0;
}
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