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From: ericblake AT comcast DOT net (Eric Blake)
To: cygwin AT cygwin DOT com
Subject: strace bug on Win98?
Date: Sat, 09 Jul 2005 16:33:32 +0000
Message-Id: <070920051633.19330.42CFFC5C000073CD00004B8222007510900A050E040D0C079D0A@comcast.net>

I was trying to use 'strace readlink n', where n was created by 'ln -s //none n',
to see what happens in the background[*].  But strace popped up a Windows
98 box that says

"Readlink

This program has performed an illegal operation and will be shut down.
If the problem persists, contact the program vendor.

READLINK caused an invalid page fault in
module CYGWIN1.DLL at 015f:61017e04.
Registers:
EAX=0089f074 CS=015f EIP=61017e04 EFLGS=00010246
EBX=0089ee08 SS=0167 ESP=0069ffac EBP=006a03b4
ECX=006a045c DS=0167 ESI=8180d538 FS=4ecf
EDX=bff76859 ES=0167 EDI=006a0484 GS=0000
Bytes at CS:EIP:
89 85 24 fc ff ff 0f 85 b0 00 00 00 8b 15 a8 2e 
Stack dump:"

Just before the popup box, the strace output reached:
...
10534 6048852 [main] readlink 584935 proc_terminate: nprocs 0
20588 6069440 [main] readlink 584935 proc_terminate: leaving
18069 6087509 [main] readlink 584935 __to_clock_t: dwHighDateTime 0, dwLowDateTime 0
11395 6098904 [main] readlink 584935 __to_clock_t: total 00000000 00000000
 4998 6103902 [main] readlink 584935 __to_clock_t: dwHighDateTime 0, dwLowDateTime 0
 4388 6108290 [main] readlink 584935 __to_clock_t: total 00000000 00000000
58744 6167034 [main] readlink 584935 pinfo::maybe_set_exit_code_from_windows: pid 584935, exit value - old 0x80000000, windows 0xDEADBEEF, cygwin 0x80000000

I'm wondering if there is some sort of cygwin1.dll or strace.exe bug that
is causing such a bad crash on exit of the traced program.  I have even
had a few Blue Screens of Death when trying to repeat the formula.

[*]I was trying to see whether cygwin tries to validate the existence of
//none, causing a delay until the network timeout, even though for
readlink it should be a quick return of the link contents without testing
for existence.

--
Eric Blake

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