powerpc/182978: Kernel panic on boot on powerpc64

[Julio Merino]

>Number:         182978
>Category:       powerpc
>Synopsis:       Kernel panic on boot on powerpc64
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-ppc
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Oct 14 19:30:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Julio Merino
>Release:        FreeBSD 10.0-ALPHA5 powerpc
>Organization:
>Environment:
System: FreeBSD mastodon.meroh.net 10.0-ALPHA5 FreeBSD 10.0-ALPHA5 #6 r256122M: Tue Oct 8 07:26:36 EDT 2013 jmmv at mastodon.meroh.net:/usr/obj/usr/src/sys/GENERIC64 powerpc


	
>Description:
	After upgrading src to sources from Oct 10th, I cannot boot my
	powerpc64 machine any longer.  The kernel panics during boot while,
	it seems, initializing the ATA device.
	
	Things work fine with the kernel details shown above (Oct 8th) but
	fail with a kernel from Oct 10th and also with a fresh kernel from
	today.

	The copy/pasted message I see is the following.  Please excuse any
	typos as I had to get this from a very bad-quality picture I took
	from the screen right before the machine rebooted on its own...

[...]
ata0: <K2 Kauai ATA Controller> mem 0x80204000-0x80207fff irq 167 at device 13.0 on pci6

fatal kernel trap:

   exception = 0x400 (instruction storage interrupt)
   virtual address = 0xee00000000000000
   srr0 = 0xee00000000000000
   srr1 = 0x9000000040001032
   lr = 0x87dad4
   curthread = 0xd1c8e0
          pid = 0, comm = swapper

[thread pid 0 tid 100000]
Stopped at 0xee00000000000000:
fatal kernel trap:

   exception = 0x300 (data storage interrupt)
   virtual address = 0xee00000000000000
   dsisr = 0x40000000
   srr0 = 0x8913b8
   srr1 = 0x9000000040001032
   lr = 0x14c510
   curthread = 0xd1c8e0
          pid = 0, comm = swapper

panic: sta storage interrupt trap
cpuid = 0
KDB: stack backtrace:
     0xc0000000000025d0: at .kdb_backtrace+0x5c
...: at .panic
...: at .trap_fatal
...: at .trap
...: at .powerpc_interrupt
...: kernel DSI read trap @ 0xee00000000000000 by .db_disasm+0x1c: srr1= 0x9000000000001032
>How-To-Repeat:
	
>Fix:

	


>Release-Note:
>Audit-Trail:
>Unformatted: