Tech Insider					   Technology and Trends

			   USENET Archives

From: (William R. Dirks)
Subject: Can't write vmalloc() mem in interrupt, 2.1.125/6
Date: 1998/10/23
Message-ID: <>#1/1
X-Deja-AN: 404206278
Organization: Netcom
Newsgroups: comp.os.linux.development.system

I seem to have found a serious bug in the current kernels, and I haven't 
seen any mention of it.

I have a module (a video capture driver), and any write to vmalloc()ed 
memory buffers that I do at interrupt time (in bottom half) does not 
appear in the buffer when the buffer is read later. I tried writing to 
the buffer in non-interrupt code, and that works.

There is no fault. I don't know where the memory accesses are going.

I developed this module on 2.1.106, where it works fine. I recently got
2.1.125, and noticed this problem. I now have the 2.1.126-2 patch, and it
is still there. 

I have a K6 and I compiled the kernel for 686/K6. At least one other 
person has seen this, so it is not just me or my system. Does anybody 
know anything about this?


			   USENET Archives

The materials and information included in this website may only be used
for purposes such as criticism, review, private study, scholarship, or 

Electronic mail:			      WorldWideWeb: