I have only now realized I haven't attached the promissed program to
replicate the issue.
$ cat badmmap.c
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <hugetlbfs.h>
#include <sys/mman.h>
int main(int argc, const char **argv) {
const size_t len = 224 * 1024 * 1024;
int count = (argc > 1) ? atoi(argv[1]) : 1000;
int i;
for (i = 0; i < count; ++i) {
int fd = hugetlbfs_unlinked_fd();
void *ptr = mmap(0, len, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (ptr == MAP_FAILED) {
fprintf(stderr, "mmap() failed on iteration %d (%s)\n", i, strerror(errno));
return 1;
}
close(fd);
if (munmap(ptr, len) < 0) {
fprintf(stderr, "munmap() failed on iteration %d (%s)\n", i, strerror(errno));
return 1;
}
}
printf("PASSED %d iters\n", count);
return 0;
}
$ cc -o badmmap badmmap.c -lhugetlbfs
Run 8 or so instances in parallel to reproduce.
--
Michal Hocko
SUSE Labs
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