Re: kswapd oops reproduced with 2.6.17-rc2 (was Oops with 2.6.15.3 on amd64)

["Rafael J. Wysocki" <rjw@sisk.pl>]

[sorry, I sent the previous message with a wrong address by mistake]

On Wednesday 26 April 2006 18:12, Steinar H. Gunderson wrote:
> On Wed, Apr 26, 2006 at 05:40:46PM +0200, R. J. Wysocki wrote:
> >> I reproduced this with 2.6.17-rc2 on the same machine:
> >> 
> >> [261604.531829] Unable to handle kernel paging request at ffff8000020369d8 RIP: 
> >> [261604.536538] <ffffffff802509e6>{isolate_lru_pages+74}
> > If your kernel is compiled with the debug info, could you please do
> > "gdb vmlinux"  in the kernel sorces directory and then (in gdb)
> > "l *(isolate_lru_pages+74)" to see which source line it corresponds to?
> 
> It isn't, but I hadn't changed the sources, .config or build environment
> since I built it, so I did a straight recompile with CONFIG_DEBUG_INFO set,
> and got:
> 
>   (gdb) l *(isolate_lru_pages+74)
>   0xffffffff80250c2a is in isolate_lru_pages (list.h:154).
> 
> (I had to run gdb on a machine with 64-bit userspace, but I guess just
> copying the vmlinux file should suffice.)

This kind of agrees with my result ie. list_del() in isolate_lru_pages():

0xffffffff80265b7a is in isolate_lru_pages (list.h:160).
155      * Note: list_empty on entry does not return true after this, the entry is
156      * in an undefined state.
157      */
158     static inline void list_del(struct list_head *entry)
159     {
160             BUG_ON(entry->prev->next != entry);
161             BUG_ON(entry->next->prev != entry);
162             __list_del(entry->prev, entry->next);
163             entry->next = LIST_POISON1;
164             entry->prev = LIST_POISON2;

It looks like we have passed an empty list or a NULL to list_del().  Strange.

Greetings,
Rafael