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


  - 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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