[Tcl-bugs] [ tcl-Bugs-1688163 ] Core dump under AIX 5.3 by "string compare" 2 big buffer

[SourceForge.net <no...@so...>]

Bugs item #1688163, was opened at 2007-03-26 15:42
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=1688163&group_id=10894

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: 40. Memory Allocation
Group: current: 8.4.14
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: eax128 (eax128)
Assigned to: Jeffrey Hobbs (hobbs)
Summary: Core dump under AIX 5.3 by "string compare" 2 big buffer

Initial Comment:
I found a problem of TCL under IBM AIX 5.3, if I use some tcl code to compare 2 big files(size > 18M) , I found the tcl will core dump and report message: 
"unable to realloc 36882016 bytes 
IOT/Abort trap (core dumped) " 

I do a test and found maybe it is  a special problem of TCL on AIX. Other Unix platforms(hpux,sunos,linux) do not have this problem. 


The test code is as below: 

--- test.tcl-- 
# test "compare 2 big file(>18M) with string compare" 
# step 1 create 2 big files, size > 18M 
set string "" 
for {set i 0} {$i < 512} {incr i} { 
    append string test 
} 

if {[file exists ./BigFile1 ]} { 
    file delete ./BigFile1 
} 

if {[file exists ./BigFile2 ]} { 
    file delete ./BigFile2 
} 

set fd [open ./BigFile1 w] 
for {set i 0} {$i < 9000} {incr i} { 
    puts $fd $string 
} 
close $fd 
file copy ./BigFile1  ./BigFile2 

# step 2 use string compare 
set fd1 [open ./BigFile1] 
set fd2 [open ./BigFile2] 
set s1 [read -nonewline $fd1] 
set s2 [read -nonewline $fd2] 
string compare $s1 $s2 ;#then tcl will core dump 

All the version of  tcl 8.4.12,  tcl8.4.13 , tcl8.4.14 and tcl  8.5 will occur this problem on AIX 5.3 

I test this problem on 2 AIX boxs, both AIX 5.3, with default installation, both of them will core dump. 


If it has no relation with AIX kernel configuration setting, I think it's a bug, maybe from tcl core,maybe from C lib of AIX. 

Thanks a lot 
                      eax...@gm...







----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=1688163&group_id=10894