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Update stressfs to trigger race now the logging code serializes writes

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This commit is contained in:
Frans Kaashoek 2011-09-27 12:59:47 -04:00
parent 5304c854a4
commit 9b972c06b1
1 changed files with 17 additions and 5 deletions
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22
stressfs.c
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@ -2,8 +2,10 @@
// appends to the idequeue results in a race. // appends to the idequeue results in a race.
// For this to work, you should also add a spin within iderw's // For this to work, you should also add a spin within iderw's
// idequeue traversal loop. Spinning 40000 times demonstrated the bug // idequeue traversal loop. Adding the following demonstrated a panic
// after about 5 runs of stressfs in QEMU on a 2.1GHz CPU. // after about 5 runs of stressfs in QEMU on a 2.1GHz CPU:
// for (i = 0; i < 40000; i++)
// asm volatile("");
#include "types.h" #include "types.h"
#include "stat.h" #include "stat.h"
@ -16,19 +18,29 @@ main(int argc, char *argv[])
{ {
int fd, i; int fd, i;
char path[] = "stressfs0"; char path[] = "stressfs0";
char data[512];
printf(1, "stressfs starting\n"); printf(1, "stressfs starting\n");
memset(data, 'a', sizeof(data));
for(i = 0; i < 4; i++) for(i = 0; i < 4; i++)
if(fork() > 0) if(fork() > 0)
break; break;
printf(1, "%d\n", i); printf(1, "write %d\n", i);
path[8] += i; path[8] += i;
fd = open(path, O_CREATE | O_RDWR); fd = open(path, O_CREATE | O_RDWR);
for(i = 0; i < 100; i++) for(i = 0; i < 20; i++)
printf(fd, "%d\n", i); // printf(fd, "%d\n", i);
write(fd, data, sizeof(data));
close(fd);
printf(1, "read\n");
fd = open(path, O_RDONLY);
for (i = 0; i < 20; i++)
read(fd, data, sizeof(data));
close(fd); close(fd);
wait(); wait();