[parisc-linux] segfaults with ssh

[James Bottomley]

This seems to be the cardinal signature of our PA8800 failures.
However, I thought people might be interested in this:

do_page_fault() pid=2092 command='sshd' type=15 address=0x8169d826
vm_start = 0x40cb0000, vm_end = 0x40cb4000

     YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
PSW: 00000000000001001111111100001111 Not tainted
r00-03  0000000000000000 00000000403018c4 00000000402dfbbf 0000000040000750
r04-07  00000000403018c4 000000008169d826 0000000040302780 0000000000012bff
r08-11  0000000000073f04 0000000000000000 0000000040302780 0000000000000000
r12-15  0000000000000000 0000000000000000 00000000000125a0 0000000000000000
r16-19  0000000000000001 00000000faf00b90 00000000403023ac 00000000403018c4
r20-23  000000008168e714 0000000040c9ede8 000000000000f112 0000000000000001
r24-27  0000000000000000 000000008169d826 0000000000012bff 000000000007401c
r28-31  000000000000006c ffffffff81010100 00000000faf01200 00000000402e467b
sr0-3   00000000001a9800 00000000001a9800 0000000000000000 00000000001a9800
sr4-7   00000000001a9800 00000000001a9800 00000000001a9800 00000000001a9800

IASQ: 00000000001a9800 00000000001a9800 IAOQ: 00000000402ea627 00000000402ea62b
 IIR: 0f201014    ISR: 00000000001a9800  IOR: 000000008169d826
 CPU:        0   CR30: 000000006cca0000 CR31: 0000000010400000
 ORIG_R28: 0000000070000021
 IAOQ[0]: 0x402ea627
 IAOQ[1]: 0x402ea62b
 RP(r2): 0x402dfbbf

It's almost identical to the pa8800 ssh problems.  However, this
particular gem came from trying to ssh to my raven just after it had
booted a bog standard rescue kernel (2.6.10-pa11, UP, 64bit), a sequence
of operations I've done hundreds of times before and never seen this.
So, consider this evidence that we might have an existing coherency
problem that just happens to be a lot more pronounced on the pa8800.
Unfortunately, that doesn't go any way towards helping us isolate it.

James