Bug 107552

Summary: Compiler issue causing execssive kernel stack usage
Product: Red Hat Enterprise Linux 2.1 Reporter: Tim Burke <tburke>
Component: gccAssignee: Jakub Jelinek <jakub>
Status: CLOSED ERRATA QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: 2.1CC: jbaron, jneedle, sct, tao
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2003-12-19 17:42:57 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 87937, 90320    

Description Tim Burke 2003-10-20 15:37:42 UTC 
Description of problem:
Excerpt from email from Stephen:

Hi,

On Thu, 2003-10-16 at 10:57, Stephen C. Tweedie wrote:


>> 000002c0 <ext3_free_blocks>:
>>      2c4:       81 ec ac 01 00 00       sub    $0x1ac,%esp


>> 000024b0 <ext3_new_inode>:
>>     24b4:       81 ec 28 02 00 00       sub    $0x228,%esp



Building these by hand with the original AS-2.1 compiler from my
Pensacola isos, I get:

Compiler: gcc-2.96-108.1
000002c0 <ext3_free_blocks>:
     2c4:	83 ec 5c             	sub    $0x5c,%esp
000023a0 <ext3_new_inode>:
    23a4:	83 ec 68             	sub    $0x68,%esp

But with the errata compiler things are *VERY* different.  I grabbed
2.1AS-errata/gcc/2.96-118.7.2 from beehive.  That's the exact same gcc
version string that appears in the 2.4.9-e.27 vmlinux version ID.  And
with that:

Compiler: gcc-2.96-118.7.2

000002c0 <ext3_free_blocks>:
     2c4:	81 ec ac 01 00 00    	sub    $0x1ac,%esp
000023a0 <ext3_new_inode>:
    2464:	81 ec 28 02 00 00    	sub    $0x228,%esp

These are the exact same sources trees with nothing but a "make clean;
install new compiler; make" in between.

*OUCH*.  I plead "mummy, it's not my fault!  Can I have a new compiler,
please?"

Cheers, 
 Stephen
Comment 1 Jeff Needle 2003-11-17 14:06:09 UTC 
While this one is still in a NEW state, I believe it is resolved.  Are
we using the new compiler with a fix for this behavior to build QU3,
Jason?
Comment 3 John Flanagan 2003-12-19 17:42:57 UTC 
An errata has been issued which should help the problem described in this bug report. 
This report is therefore being closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files, please follow the link below. You may reopen 
this bug report if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2003-358.html