Re: 2.6.7-mm2, mmaps rework, buggy apps, setarch

[Norbert Preining]

On Fre, 25 Jun 2004, Andrew Morton wrote:
> > But what to do with a commerical app where I
> > cannot check a stack trace or whatever?
> 
> Use strace -f, look at the last screenful of output.  That usually works.

open("/media4/scan/cam-2002.03/001-100/raw/scan0100.tif", O_RDONLY) = 6
lseek(6, 0, SEEK_END)                   = 43426634
lseek(6, 0, SEEK_CUR)                   = 43426634
lseek(6, 0, SEEK_SET)                   = 0
mmap2(NULL, 43426634, PROT_READ|PROT_WRITE, MAP_PRIVATE, 6, 0) = -1 ENOMEM (Cann
ot allocate memory)
lseek(6, 0, SEEK_END)                   = 43426634
lseek(6, 0, SEEK_CUR)                   = 43426634
fstat64(6, {st_mode=S_IFREG|0644, st_size=43426634, ...}) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++

I guess that you are right.

> Ingo's setarch patch wasn't a lot of use because it seems to be against a
> setarch which doesn't exist.  I hacked one up.  Try
> 
> 	setarch i386 your-program

This worked.

So what is the intended path:
- inform the author of the program
- remove the patch (you from mm, I from my build?)
- run setarch for all buggy programs

Best wishes and thanks a lot!

Norbert

-------------------------------------------------------------------------------
Norbert Preining <preining AT logic DOT at>         Technische Universität Wien
gpg DSA: 0x09C5B094      fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
-------------------------------------------------------------------------------
ELY (n.)
The first, tiniest inkling you get that something, somewhere, has gone
terribly wrong.
			--- Douglas Adams, The Meaning of Liff
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/