Re: Random fork failures

[Yoni Londner]

WJFFM, both.  There's something in your environment which isn't in mine.
Did you set $CYGWIN?



~$ echo $CYGWIN
nodosfilewarning

That's a clean installation. what can cause this kind of crashes?

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Re: Random fork failures

[Yoni Londner]

I did a little investigation - when the process hangs, I took the
backtrace with process explorer.
Process explorer does not know anything about cygwin debug symbols, so
it just give an arbitrary func + offset.
Then I used gdb to find out the real function: sync_proc_pipe doing
yield in an endless loop.

Just to complete the mail, This is the stack as I get from process 
explorer (with my additions at cygwin1.dll frames):


ntkrnlpa.exe!KeSetEvent+0x2a1
ntkrnlpa.exe!KeDelayExecutionThread+0x5cc
ntkrnlpa.exe!KeWaitForMutexObject+0x393
ntkrnlpa.exe!KiDeliverApc+0x664
halmacpi.dll!KfRaiseIrql+0xcb
halmacpi.dll!KeRaiseIrqlToSynchLevel+0x8f
halmacpi.dll!HalEndSystemInterrupt+0x67
halmacpi.dll!HalInitializeProcessor+0xae8
ntkrnlpa.exe!ZwYieldExecution+0xabd
ntdll.dll!KiFastSystemCallRet
autochk.exe+0x5bcbc
ntdll.dll!KiFastSystemCallRet
cygwin1.dll!abort+0x79bc (0x610cdebc )
cygwin1.dll!abort+0x805f (0x610ce55f )
cygwin1.dll!getenv+0x5fef (0x61029dbf )
_test.exe+0x973e
_test.exe+0x9803
_test.exe+0x9961
_test.exe+0x14d4
_test.exe+0x15ce
cygwin1.dll!dll_crt0__FP11per_process+0x708
cygwin1.dll!setprogname+0x32a6
cygwin1.dll!setprogname+0x334b
_test.exe+0x47432
_test.exe+0x101a
kernel32.dll!BaseThreadInitThunk+0x12
ntdll.dll!RtlInitializeExceptionChain+0xef
ntdll.dll!RtlInitializeExceptionChain+0xc2

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Re: Random fork failures

[Yoni Londner]

On 11/7/2011 12:02, Corinna Vinschen wrote:

I tested both scripts on W7 32 and 2K8R2 against the latest snapshot,
as well as against self-built current Cygwin CVS, built with and without
optimization.  Both scripts run fine in all scenarios.

on a clean cygwin installation (1.7.9) and new cygwin1.dll they also 
work for me.

This one does not:
touch a
install a /etc/b

rxvt disappear

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Re: Random fork failures

[Yoni Londner]

Example 1:
#!/usr/bin/perl
use POSIX qw(getcwd);
getcwd();
1;

Example 2:
#!/usr/bin/perl
use Scalar::Util qw(looks_like_number);
looks_like_number("1");
1;

Both end up with:
Segmentation fault (core dumped)


Well, I tried these two examples on a clean cygwin installation, with 
new cygwin1.dll and they work.
There are still many problems. I am working on a small, self-contained 
example.


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Re: Random fork failures

[Yoni Londner]

I will appreciate any advice, how can I solve this problem.


Simple, self-contained testcases, preferredly in plain C, or simple
scripts in case the problem only occurs in a script language, which
allow to reproduce the problem.  Those would be most helpful.


Corinna



Example 1:
#!/usr/bin/perl
use POSIX qw(getcwd);
getcwd();
1;

Example 2:
#!/usr/bin/perl
use Scalar::Util qw(looks_like_number);
looks_like_number("1");
1;

Both end up with:
Segmentation fault (core dumped)

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