Re: [9fans] Race condition in /sys/src/9/pc/trap.c?

["Devon H. O'Dell" <devon.odell@gmail.com>]

2009/7/31 erik quanstrom <quanstro@coraid.com>:
>> > could you be more specific.  what is your test program,
>> > where is it crashing (if you know), and what is the panic
>> > message, if any?  i must be dense, but i'm confused by
>> > your process diagram.
>>
>> He posted it earlier in this thread
>>
>> --dho
>
> please post a reference.  i do not see either the crash
> code or the panic message on 9fans.net/archive/2009/07.
> i don't recall it in the originals, either.
>
> - erik

Was received as an attachment. Inline:

#include <u.h>
#include <libc.h>

void
main(int argc, char **argv)
{
	char *buf;
	int fd;

	if((fd = open("/dev/zero", OREAD)) < 0)
		sysfatal("open");

	buf = (char*)0x600000;
	segattach(0, "memory", buf, 2*4096);

	switch(rfork(RFPROC|RFMEM)){
	case -1:
		sysfatal("fork");
		break;
	case 0:
		for(;;){
			read(fd, buf+4096, 4096);
		}
	}
	sleep(1000);
	segbrk(buf, buf+4096);
}

--dho