Re: [BUG] in 2.4.17 after 10 days uptime

From: Marcelo Tosatti (
Date: Mon Jan 07 2002 - 13:28:12 EST

On Tue, 1 Jan 2002, Benjamin LaHaise wrote:

> On Tue, Jan 01, 2002 at 02:18:01AM -0500, Ed Tomlinson wrote:
> > I started getting these bugs after about 10 days uptime. There is a patch
> > set for reiserfs applied along with a few minor patches (ide-tape, disk
> > stats for up to hdg). The kernel is tainted by:
> Expected BUG. Here's the fix. Marcelo, this is what we discussed previously:
> parts of the kernel that grab a temporary reference to a page will frequently
> not use page_cache_release as the page may never have been part of the page
> cache. This shows up with the network stack in sendpage() as well as many
> other paths. Please apply.


I suppose you're talking about the following case:

pagecache code has LRU page

                            nonpagecache code does page_cache_get()

pagecache code does page_cache_release()

                           nonpagecache code does __free_pages_ok()
                           on LRU page: BOOM.

Is my thinking correct ?

If so, I don't see why Ed's trace BUGs at rmqueue first: It should bug at
__free_pages_ok() PageLRU check.

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