Date: Mon, 17 Jan 2000 18:31:47 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Iani Brankov <ian@bulinfo.net> Cc: hackers@FreeBSD.ORG Subject: Re: The stack size for a process? Message-ID: <200001180231.SAA18439@apollo.backplane.com> References: <3883AC8A.7A6F7D5F@bulinfo.net>
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:Hi,
:
:after making world of a CURRENT cvsupped yesterday, one of my
:applications stopped working because of a Segmentation fault.
:
:The C procedure where the problem pops has about 64k local variables.
:here's the assembly output of the procedure's beginning:
:
:0x805bb60 <transaction_read_objects>: pushl %ebp
:0x805bb61 <transaction_read_objects+1>: movl %esp,%ebp
:0x805bb63 <transaction_read_objects+3>: subl $0x1000c,%esp
:0x805bb69 <transaction_read_objects+9>: pushl %edi
:
:
:The Segmentation fault happens when the process tries to push %edi in
:the stack, which has been just decreased by 0x1000c.
:
:here's the stack in the beginning of main():
:esp 0xbfbfd744
:ss 0x27
:
:and after the fault:
:esp 0xbfacae68
:ss 0x27
:
:If I decrease the size of the local vars, it goes ok.
:
:It's interesting, because I made a simple test using 640k local vars,
:and it worked!
:
:void ab() {
: char buf[655360];
: buf[0] = 0;
: buff[655359] = 0;
:}
:
:main () {
: ab();
:}
:
:
:--iani
At your csh prompt type 'limit'. If you are using bash type 'ulimit -a'.
When I compile and run your program it works fine on my box. I tried
compiling it -O0, -O1, and -O2.
% cc x.c -o x -O0
% ./x
%
-Matt
Matthew Dillon
<dillon@backplane.com>
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