On Tue, May 13, 2014 at 11:15:56PM -0400, Theodore Ts'o wrote:
> We're seeing a number of ext4 BUG_ON's when using unionfs. They can
> be triggered using fsx, so we've seen it with xfstests generic/074,
> generic/112, generic/127, and generic/198, for example. None of these
> tests are failing if we use ext4 w/o unionfs.
And here's an even simpler repro case. Again, this works just fine
w/o unionfs.
- Ted
/*
* mmap-write.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <string.h>
#include <fcntl.h>
int main(int argc, char **argv)
{
int fd;
char *map;
fd = open("testfile", O_RDWR|O_CREAT, 0666);
if (fd < 0) {
perror("open");
exit(1);
}
if (ftruncate(fd, 4096) < 0) {
perror("ftruncate");
exit(1);
}
map = mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (map == MAP_FAILED) {
perror("mmap");
exit(1);
}
strcpy(map,
"Murphy Magic. The SeCrEt of the UnIvErSe is 43, NOT 42.\n");
if (msync(map, 4096, MS_SYNC) < 0) {
perror("msync");
exit(1);
}
exit(0);
}
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