Mail Archives: cygwin/2004/02/19/19:10:12
On Thu, Feb 19, 2004 at 05:58:59PM -0600, Cliff Geschke wrote:
>>From: Christopher Faylor [mailto:cgf-no-personal-reply-please AT cygwin DOT com]
>>Sent: Thursday, February 19, 2004 12:05 AM
>>Subject: Re: Repeatable crash with CVS version of cygwin1 DLL
>>
>>On Wed, Feb 18, 2004 at 11:03:21PM -0600, Cliff Geschke wrote:
>>>I have tried the latest update from CVS. Still crashes, but stackptr
>>>does not go out-of-bounds. At some point, _sigbe tries to ret with the
>>>top of stack ($esp) value set to 0.
>>>
>>>Some additional data points:
>>>
>>>1. I moved the test .exe file to a Win2000 box running an old
>>>cygwin1.dll (file version 1005.5.0.0, product version 1.5.5-cr-0x9b).
>>>No crash. The test seems to run fine.
>>
>>Sorry. The fact that this worked in 1.5.5 is uninteresting.
>
>Actually it _is_ interesting because it means that the crash is not due to some
>bogus use of longjmp/setjmp in my test program.
It doesn't necessarily mean that. Just because something worked in
1.5.5 doesn't mean that your app uses setjmp correctly.
In fact, on rereading the code snippet that you posted, it actually is
using setjmp incorrectly. It calls setjmp in a function and then
(potentially) returns. When it doesn't return it jumps to another
thread context which almost has to invalidate the setjmp context by
default. That invalidates the jmp_buf argument to setjmp. I don't know
if this is really an actual code sample but, if it is, it doesn't seem
to be compliant with this sentence from the setjmp man page:
"The stack context will be invalidated if the function which called
setjmp() returns."
>Okay, you asked for it...
>uudecode, gunzip, (chmod maybe) then ./ticker.exe
>It should type a message every 5 seconds for 30 seconds.
>But it crashes after the 2nd message.
Ok. I'll look at it.
Thanks,
cgf
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