> System crashes with three Mellanox mezzanine cards (VID=15b3,
> DID=0x6274) installed when booting Linux (ia64). I am using Linux
> 2.6.24, but this issue also occurs with Linux kernel 2.6.29-rc8.
this is a pretty interesting crash. Do you have the ib_mthca driver
built into your kernel, or is it being loaded as a module?
> A partial listing from ib_mad_post_receive_mad.S is posted below the "C"
> code.
> The exact instruction that cause the system crash was located at
>
> ib_mad_post_*+0x0080 st4 [r2]=r3
> MII
> nop.i 0x0
> nop.i 0x0
>
> It tries to store r3=0x1600 to [r2] @ 0xE0000007E01C7CCC.
Looking at the assembly, it seems the relevant parts are:
ib_mad_post_*+0x0060 ld4 r3=[r11] MMI
st8 [r2]=r8
adds r2=28,r12
ib_mad_post_*+0x0070 st4 [r9]=r10 MMI
st8 [r45]=r0
nop.i 0x0;;
ib_mad_post_*+0x0080 st4 [r2]=r3 MII
The main points are "adds r2=28,r12" -- ie r2 now points into the
stack -- and "st4 [r2]=r3" -- ie a store onto the stack is crashing.
In the same function, we have "adds r9=56,r12" and "st4 [r9]=r10"
slightly earlier, so the stack isn't totally messed up (apparently).
Not sure how to debug this since the crash as it stands doesn't seem to
make much sense...
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