often causes deadlock after a few minutes

This commit is contained in:
Robert Morris 2020-10-04 08:44:32 -04:00 committed by Frans Kaashoek
parent 9c8d1e2909
commit 3c70be9070

View file

@ -17,10 +17,9 @@
// prints "OK".
//
#define BUFSZ (MAXOPBLOCKS+2)*BSIZE
#define BUFSZ ((MAXOPBLOCKS+2)*BSIZE)
char buf[BUFSZ];
char name[3];
// what if you pass ridiculous pointers to system calls
// that read user memory with copyin?
@ -631,6 +630,7 @@ createtest(char *s)
int i, fd;
enum { N=52 };
char name[3];
name[0] = 'a';
name[2] = '\0';
for(i = 0; i < N; i++){
@ -1728,6 +1728,61 @@ bigwrite(char *s)
}
}
// concurrent writes to try to provoke deadlock in the virtio disk
// driver.
void
manywrites(char *s)
{
int nchildren = 4;
for(int ci = 0; ci < nchildren; ci++){
int pid = fork();
if(pid < 0){
printf("fork failed\n");
exit(1);
}
if(pid == 0){
char name[3];
name[0] = 'b';
name[1] = 'a' + ci;
name[2] = '\0';
unlink(name);
for(int iters = 0; iters < 500000; iters++){
for(int i = 0; i < ci+1; i++){
int fd = open(name, O_CREATE | O_RDWR);
if(fd < 0){
printf("%s: cannot create %s\n", s, name);
exit(1);
}
int sz = sizeof(buf);
int cc = write(fd, buf, sz);
if(cc != sz){
printf("%s: write(%d) ret %d\n", s, sz, cc);
exit(1);
}
close(fd);
}
unlink(name);
if((iters % 50) == ci)
write(1, ".", 1);
}
unlink(name);
exit(0);
}
}
for(int ci = 0; ci < nchildren; ci++){
int st = 0;
wait(&st);
if(st != 0)
exit(st);
}
exit(0);
}
void
bigfile(char *s)
{
@ -2682,6 +2737,7 @@ main(int argc, char *argv[])
void (*f)(char *);
char *s;
} tests[] = {
// {manywrites, "manywrites"},
{execout, "execout"},
{copyin, "copyin"},
{copyout, "copyout"},