Albert Cahalan wrote: > On Mon, 2003-11-10 at 19:21, Prasanna Meda wrote: > > > In reply to > > http://lists.debian.org/debian-user/2002/debian-user-200206/msg01866.html > > > > I also noticed the same problem. It is due to > > ps trying to access the past end of mmaped > > System.map file in my case. What does your > > trace show? Is this fixed in later versions? > > It is mapping one byte more and accessing > > that byte and is getting SIGBUS. > > Back in the Linux 1.x.xx era, Linus deliberately > made an allowance for the above. It seemed, and > still seems, to be good kernel behavior. After all, > an incomplete page is padded with '\0' characters. > Why should a full page be any different? > > Unfortunately, some idiot got SIGBUS into the > UNIX standard. With regret, Linus changed the > kernel. This broke even his own mkdep code > that was part of the kernel build process. > > The procps-3.x.xx releases available in recent > versions of Debian no longer rely on this > wonderful old Linux feature.
Yes, I see the semantics change in kernel from 2.2 to 2.4, but what is the reason behind your mapping filesize+1 bytes in first than filesize bytes? In my case, the file size is 475136 bytes, that is exactly 116 pages, mmap is done for 475137 bytes. Thanks, Prasanna. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
