Re: page_alloc bug in 2.4.17-pre8

[Mike Black]

Oops -- got the wrong version (head was in the wrong kernel space).
This occurred on 2.4.19-pre8

----- Original Message ----- 
From: "Hugh Dickins" <[e-mail]>
To: "Mike Black" <[e-mail]>
Cc: "linux-kernel" <[e-mail]>
Sent: Thursday, May 23, 2002 8:12 AM
Subject: Re: page_alloc bug in 2.4.17-pre8

> On Thu, 23 May 2002, Mike Black wrote:
> > This machine had been up for 2-1/2 days and had run this backup (afio) twice successfully.
> > 
> > Here's line 108 of page_alloc.c:
> >         if (PageLRU(page))
> >                 BUG();
> > 
> > Hopefully this doesn't indicate a CPU problem?  The power supply on this thing blew Saturday but has run OK until now.
> > 
> > May 22 00:51:01 picard kernel: kernel BUG at page_alloc.c:108!
> > May 22 00:51:01 picard kernel: invalid operand: 0000
> > May 22 00:51:01 picard kernel: CPU:    1
> > May 22 00:51:01 picard kernel: EIP:    0010:[swap_duplicate+82/192]    Not tainted
> 
> There were quite a number of reports of those PageLRU BUGs on 2.4.17.
> No idea what fixed them, but 2.4.18 (and 2.4.19-pre) has seemed free
> of them (Ben LaHaise made a plausible change, but closer analysis
> suggested it couldn't really be the fix).  Suggest you upgrade.
> 
> Your oops report, by the way, must have been using the wrong System.map:
> page_alloc.c:108 is in __free_pages_ok(), swap_duplicate() is over in
> swapfile.c.  But no matter, page_alloc.c:108 identifies it well enough.
> 
> Hugh 
>