[Xen-devel] Question regarding SLAB corruption

[Lukas Hejtmanek <xhejtman@xxxxxxxxxxx>]

Hello,

I'm playing with InfiniBand driver in Xen both Dom0 and DomU.

I found out that the driver is somewhat unstable in the Dom0 and in the DomU
it does not work either which is something I would like to fix.

In Dom0, the following sequence kills the machine:
modprobe ib_mthca
rmmod ib_mthca
insmod ib_mthca debug_level=1

It produces oops with random process. If I turn on SLAB DEBUG, I got the
following report:
Redzone: 0x1600000016/0x1700000017.
Last user: <0000001800000018>(0x1800000018)
000: 17 00 00 00 17 00 00 00 18 00 00 00 18 00 00 00
010: 19 00 00 00 19 00 00 00 1a 00 00 00 1a 00 00 00
020: 1b 00 00 00 1b 00 00 00 1c 00 00 00 1c 00 00 00
030: 1d 00 00 00 1d 00 00 00 1e 00 00 00 1e 00 00 00
040: 1f 00 00 00 1f 00 00 00 00 00 00 00 00 00 00 00
050: 01 00 00 00 01 00 00 00 02 00 00 00 02 00 00 00
Prev obj: start=0000000398f5120b, len=256

InfiniBand developers told be that they are using SLAB_DEBUG and
modprobe/rmmod works OK in non-Xen environment.

So, any thoughts or suggestions to catch the bug? 

-- 
Lukáš Hejtmánek

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