Sorry for this rather late summary! I cought the flu :(

Thanks to Casper Dik, David Robillard, Kevin Sheehan, Aki Sasaki and

others who responded!

Well, I did not find a direct solution for the problem, but something

is different in Solaris 7.

I played around with gdb and found that on Solaris 2.6 the FP and SP

registers corresponds

to each other, they apparantly point to some location in the stackframe.

But, when I run a

Solaris 7 app - the FP register is *not* pointing to an address inside

the stack. Strange but true.

Going deeper inside the application I eventually found a small routine

that relied on FP for

calculating the stack base, and thus it gave the wrong result on Sol 7

and not on 2.6.

Regards,

Magnus Walldal

mw@cognition.se

System Engineer

Cognition AB (http://www.cognition.se)

S-431 85 M鰈ndal

Sweden

The question was:

I've run into a possible compatibility problem between Solaris 2.6 and

Solaris 2.7.

My app which is a document management tool worked just fine until we

decided to upgrade our Sun Ultra Enterprise-250 from 2.6 to 2.7. At

first I

suspected some faulty library, so we did apply publicly available

patches,

this did not help. The application just dies complaining about the

direction

of the stack.

Then I tried increasing available stackspace for the process to 64K but

that did

not help either (and was not required when run on 2.6). The application

in question

seems to be a normal 32-bit program. Doing 'file' on the executeable

gives: ELF 32-bit

MSB executable SPARC Version 1, dynamically linked, stripped

Some output of what happens follow:

The following messages is from our app when it dies (yes, this comes

from the

application, and not from some library. I checked this with 'strings'):

*Log file: /export/home/spider/spider/admin/logs/sulu.err

*STACK_GROWS_DOWN is defd, but stack appears to grow up

*sp = 0xffbef684, GC_stackbottom = 0x0

*stack direction 3

Truss was not much help :(

Output from 'truss' just before process dies (it dies very early in its

execution):

...

open("/usr/platform/SUNW,Ultra-250/lib/libc_psr.so.1", O_RDONLY) = 4

fstat(4, 0xFFBEF354) = 0

mmap(0xFF360000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 4, 0)

= 0xFF360000

mmap(0x00000000, 16384, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) =

0xFF330000

close(4) = 0

close(3) = 0

munmap(0xFF360000, 8192) = 0

write(2, " S T A C K _ G R O W S _".., 55) = 55

...

I really dont have much more to go on...