[linux-mm-cc] Compcache crash syslog

[Nitin Gupta]

On Sun, Feb 24, 2008 at 10:06 AM, John McCabe-Dansted <gmatht at gmail.com> wrote:
> Here is the syslog of one of the compcache crashes on Gutsy-i386
>  (2.6.22-14-generic #1) . The most interesting entries appear to be:
>   Adding 255996k swap on /dev/compcache.  Priority:1 extents:1 across:255996k
>   ...
>   compcache: Compressed swap size set to: 756000 KB
>   TLSF: pool: f8ba3000, init_size=16384, max_size=0, grow_size=16384
>   compcache: compcache: initialization done!
>   compcache: read before write: page_no=188976
>   printk: 8 messages suppressed.
>   Buffer I/O error on device compcache, logical block 188976
>   compcache: read before write: page_no=188976
>   ...
>   Buffer I/O error on device compcache, logical block 188999
>   compcache: read before write: page_no=188999
>   compcache: read before write: page_no=188999
>   compcache: read before write: page_no=188999
>   compcache: read before write: page_no=188992
>   compcache: read before write: page_no=188998
>   compcache: read before write: page_no=188999
>   compcache: read before write: page_no=188999
>   compcache: read before write: page_no=1
>   Adding 755996k swap on /dev/compcache.  Priority:-3 extents:1 across:755996k
>   BUG: unable to handle kernel NULL pointer dereference at virtual
>  address 00000007
>   ...
>   [lapic_next_event+12/16] lapic_next_event+0xc/0x10
>   [<f8b80480>] lzo1x_1_compress+0x30/0x104 [lzo1x_compress]
>   [<f8b97153>] compcache_make_request+0x133/0x310 [compcache]
>   [generic_make_request+597/992] generic_make_request+0x255/0x3e0
>   [smp_apic_timer_interrupt+85/128] smp_apic_timer_interrupt+0x55/0x80
>   [apic_timer_interrupt+40/48] apic_timer_interrupt+0x28/0x30
>   [native_flush_tlb_others+102/176] native_flush_tlb_others+0x66/0xb0
>


This is now (hopefully!) fixed in SVN repository.
Can you please test compcache from the SVN? You can checkout code as:

svn checkout http://compcache.googlecode.com/svn/trunk/ compcache-read-only

There is lot more stuff in SVN which you can ignore for now.

Thanks,
Nitin