Red Hat Bugzilla – Bug 14668
Problem iBCS appeared starting from the version Linux RedHat 6.1
Last modified: 2008-05-01 11:37:57 EDT
Subject: Problem iBCS appeared starting from the version Linux RedHat 6.1 ************************************************************************* We use, under development, a BASIC interpreter that initially functioned under various SCO environments : (SCO XENIX 386, SCO UNIX 3.2 v4.2, SCO OPENSERVER 5). We succeeded, without problems and thanks to the iBCS module, to work whith it in a linux RedHat 6.0 (2.2.5) developpement environnement.In order to follow the Linux peripheral drivers evolutions, we have done tests whith the RedHat 6.1 (kernel 2.2.10) and RedHat 6.2 (kernel 2.2.14). The first tests were not convincing : The launching of the interpreter always ended with an error "Segmentation fault". The only way we found to avoid this problem has been to install the BASIC interpreter in a small linux ext2 partition of 10 Mb and by using a symbolic link to have it in the /usr directory. This "solution" works fine too for other binary files that were causing the same errors "Segmentation Faults". As you can imagine, we are not satisfied with this solution and we are looking for information about this problem : - Why does it appear? - Is there something to do to solve it really? - Is our "empirical solution" the only way to execute our binary files? To understand better the problem, here are some more informations about what we did. Additional information: 1 - information returned by " file " for the binary file (b): # b: Pure Microsoft a.out separate segmented Word-swapped V2.3 V3.0 386 small model executable 2 - binary type of file recognized by iBCS: format xout 3 - Case which does not function correctly: Partitioning: /dev/sda5 one / standard ext2 (rw) (1500Mo) /dev/sda1 one / standardboot ext2 (rw) (1OMo) /dev/sda7 one /uss standard ext2 (rw) (500Mo) Installation: b copied in / usr/local/bin Result (Bad :-( ): #/usr/local/bin/b Segmentation fault 4 - Case which functions correctly: Partitioning: /dev/sda5 one / standard ext2 (rw) (1500Mo) /dev/sda1 one / standardboot ext2 (rw) (10Mo) /dev/sda7 one / cibcs standard ext2 (rw) (10Mo) /dev/sda8 one / uss standard ext2 (rw) (490Mo) Installation: b copied /cibcs ln - s /cibcs/b /usr/local/bin/b Result (Good :-) ): #/usr/local/bin/b Running CBASE... IPL doesn't exist or is not a regular file. #
Does this still happen with the errata kernel (2.2.16-3)?
yes , we have the same problem with the kernel 2.2.16-3 If i creates a ext2 filesystem with the RH6.0 distribution's mke2fs under RH6.2 , it's good !!!! , why ???? .
On RH6.2 , the default block size and the default fragment size use by mke2fs are set to 8192 for large ext2 fs. If i use mke2fs with a value of 1024 (options -b and -f) , all xout binaries run well .
This sounds like there is a block size assumption in the x.out loader for 1K blocks. I wasn't aware of this one. I will investigate when I get time
ibcs2 was replaced with xabi in 2.4