Re: [Crash-utility] Re: Question about fixing another crash annoyance...t
----- "Bob Montgomery" <bob.montgomery(a)hp.com> wrote:
Dave,
You are faster than me at fixing crash:-) I was just about to start on
the part for kmem_cache_len_nodes...
The patch fixes the problem on my example dump which previously said:
=====
please wait... (gathering kmem slab cache data)
crash: page excluded: kernel virtual address: ffff88022457a000 type:
"kmem_cache_s buffer"
crash: unable to initialize kmem slab cache subsystem
=====
It now says:
=====
please wait... (gathering kmem slab cache data)
kmem_cache_downsize: SIZE(kmem_cache_s): 872 cache_cache.buffer_size: 384
kmem_cache_downsize: nr_node_ids: 2
=====
Sorry -- I didn't mean to leave the "CRASHDEBUG(0)" in there, so the
messages above shouldn't normally be displayed. I'll make it
CRASHDEBUG(1) so we'll have a record of it happening if something
else comes up in the future.
In the meantime, I remembered "--zero_exclude", which makes for
a slightly dangerous workaround for the problem. It fills in the
unnecessarily-accessed missing pages with zeros.
The output of "kmem -s" and "kmem -S" on my problem dump is the
same between your patched version and the old version running
with --zero_exclude. (I don't normally think of using zero_exclude
because it can mask both kernel bugs and makedumpfile bugs...)
Yep --zero_excluded masks this problem quite nicely... ;-)
Thanks for making that patch. Is there anything left to
fix in crash ?-)
No doubt...
Thanks,
Dave