Re: [Xen-devel] [SPAM] Re: kernel BUG at arch/x86/xen/mmu.c:1860! - ideas.

[Andreas Olsowski <andreas.olsowski@xxxxxxxxxxx>]

>   - turn on CONFIG_DEBUG_PAGEALLOC
>   - turn on CONFIG_DEBUG_LIST
>   - turn on CONFIG_DEBUG_KMEMLEAK
>   - turn on CONFIG_JBD_DEBUG, CONFIG_JBD2_DEBUG
>   - turn on CONFIG_SLUB_DEBUG_ON
After i enabled those options (i dont use SLUB, i use SLAB) i do no 
longer encounter any errors.
I completed 1000 loops of snapshot/mount/umoun/removesnapshot.


Without those options in 2.6.32.35 i hit a different bug earlier today:

But you really have to be patient to see some output, because lvremove 
will hang quite a while:
(a "while" beeing the a a roughly the time it takes for: wait 5 min for 
error, leave office, get coffee, smoke cigarette, goto restroom, return 
to office, finally see error)
kernel: BUG: unable to handle kernel paging request
...
kernel: RIP  [<ffffffff8100f2bf>] xen_set_pmd+0x2f/0xb0
syslog/dmesg output is attached as crash.2.6.32.35-xen_01 or available at:
http://pastebin.com/Ad8MhUzD

After that happened i did a kernel recompile without rebooting the 
machine first and encoundeterd system_call_fastpath as last call once 
more as shown in crash.2.6.32.35-xen_02 or http://pastebin.com/kB38W5mp

Maybe this helps, but i think, if anything, this makes it worse as the 
debug options actually supressed the problem that needs to be debugged.
with best regards

--
Andreas "andiolsi "Olsowski

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