panic in tsb_tte_lookup()

[Kris Kennaway]

On Sun, Jan 22, 2006 at 02:12:05PM -0500, Kris Kennaway wrote:
> 12-processor e4500 running 7.0:
> 
> panic: trap: data access error
> 
> db> wh
> Tracing pid 57006 tid 100210 td 0xfffff80256141110
> panic() at panic+0x164
> trap() at trap+0x418
> -- data access error %o7=0xc0305490 --
> tsb_tte_lookup() at tsb_tte_lookup+0xd0
> pmap_copy() at pmap_copy+0xe0
> vm_map_copy_entry() at vm_map_copy_entry+0x12c
> vmspace_fork() at vmspace_fork+0x2f4
> vm_forkproc() at vm_forkproc+0xe4
> fork1() at fork1+0xe14
> fork() at fork+0x10
> syscall() at syscall+0x2dc
> -- syscall (2, FreeBSD ELF64, fork) %o7=0x1101a0 --
> userland() at 0x40649088
> user trace: trap %o7=0x1101a0
> pc 0x40649088, sp 0x7fdffffd701
> pc 0x106890, sp 0x7fdffffd7c1
> pc 0x1072b0, sp 0x7fdffffd981
> pc 0x10a498, sp 0x7fdffffda71
> pc 0x10be24, sp 0x7fdffffdc21
> pc 0x1065e8, sp 0x7fdffffdce1

For the benefits of the archives (and possibly myself the next time I
encounter this and have forgotten again) this and related panics are
because the e4500 detected a hardware failure in one of the CPU boards
and tried to take it offline, and FreeBSD was blithely unaware of this
and promptly panicked.

Kris

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