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| Message-ID: | <50DCB454.9030400@coverity.com> |
| Date: | Thu, 27 Dec 2012 15:49:24 -0500 |
| From: | Tom Honermann <thonermann AT coverity DOT com> |
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| To: | <cygwin AT cygwin DOT com> |
| Subject: | Re: Intermittent failures retrieving process exit codes - snapshot test requested |
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I've been doing some testing with the latest source (pulled updates
about 30 minutes ago). I'm no longer able to reproduce any problems
with incorrect exit codes (Yay! Thanks for the quick turn around on
that!), but I am seeing some new errors when terminating the infinite
loop via ctrl-c using the test case below. This is a test case I was
using previously to help isolate the original problem - I had added
special_printf() calls in a few places and was using strace -m special
to trigger them. All of my changes have been reverted and I'm back to
using vanilla source code. This test is run with a newly built
strace.exe and cygwin1.dll (the false.exe is an old one)
c:\>type test-strace.bat
@echo off
setlocal
set PATH=%CD%;%PATH%
:loop
echo test...
strace -m special false
if not errorlevel 1 (
echo exiting...
exit /B 1
)
goto loop
When interrupting the test run, I'll often (but not always) get the
following error:
c:\>test-strace.bat
test...
test...
test...
test...
--- Process 8092, exception 40010005 at 75E26D67
Terminate batch job (Y/N)? y
Additionally, some of the Cygwin gcc built utilities that I've built for
testing now occasionally hang upon interruption by ctrl-c. Basic
diagnostics courtesy of gdb follow.
This utility was one used in place of strace in the test case above. It
does a fork() and execlp() of its first parameter and then calls
waitpid() on the child and asserts that the exit code received is 1.
If anyone knows of a way to get accurate stack traces when both gcc and
Microsoft compiled modules are present, I'll be happy to regenerate the
stack traces below.
$ gdb --pid=6908
GNU gdb (GDB) 7.5.50.20120815-cvs (cygwin-special)
...
Reading symbols from
/home/thonermann/cygwin/test-install/bin/expect-false-execve-cygwin32.exe...done.
...
(gdb) info shared
From To Syms Read Shared Object Library
0x77461000 0x775c5d1c Yes (*) /cygdrive/c/Windows/SysWOW64/ntdll.dll
0x75d71000 0x75e6bd58 Yes (*)
/cygdrive/c/Windows/syswow64/kernel32.dll
0x74ba1000 0x74be5a08 Yes (*)
/cygdrive/c/Windows/syswow64/KERNELBASE.dll
0x61001000 0x61490000 Yes
/home/thonermann/cygwin/test-install/bin/cygwin1.dll
0x76271000 0x76354198 Yes (*) /cygdrive/c/Windows/system32/user32.dll
0x74f11000 0x74f8292c Yes (*) /cygdrive/c/Windows/syswow64/GDI32.dll
0x76181000 0x761892f8 Yes (*) /cygdrive/c/Windows/syswow64/LPK.dll
0x74d71000 0x74e0c9fc Yes (*) /cygdrive/c/Windows/syswow64/USP10.dll
0x75bf1000 0x75c9b2c4 Yes (*) /cygdrive/c/Windows/syswow64/msvcrt.dll
0x75eb1000 0x75f4f04c Yes (*)
/cygdrive/c/Windows/syswow64/ADVAPI32.dll
0x74ed1000 0x74ee8ed8 Yes (*) /cygdrive/c/Windows/SysWOW64/sechost.dll
0x76371000 0x76445e04 Yes (*) /cygdrive/c/Windows/syswow64/RPCRT4.dll
0x74b41000 0x74b821f0 Yes (*) /cygdrive/c/Windows/syswow64/SspiCli.dll
0x74b31000 0x74b3b474 Yes (*)
/cygdrive/c/Windows/syswow64/CRYPTBASE.dll
0x76581000 0x765c1ce0 Yes (*) /cygdrive/c/Windows/system32/IMM32.DLL
0x75ca1000 0x75d6bebc Yes (*) /cygdrive/c/Windows/syswow64/MSCTF.dll
0x70e41000 0x70e8b464 Yes (*) /cygdrive/c/Windows/system32/apphelp.dll
(*): Shared library is missing debugging information.
(gdb) info thread
Id Target Id Frame
* 4 Thread 6908.0x1950 0x7747000d in ntdll!LdrFindResource_U ()
from /cygdrive/c/Windows/SysWOW64/ntdll.dll
3 Thread 6908.0x1d8c 0x7747f8e5 in ntdll!RtlUpdateClonedSRWLock ()
from /cygdrive/c/Windows/SysWOW64/ntdll.dll
2 Thread 6908.0x1d34 0x7747f8b1 in ntdll!RtlUpdateClonedSRWLock ()
from /cygdrive/c/Windows/SysWOW64/ntdll.dll
1 Thread 6908.0x1344 0x7748013d in
ntdll!RtlEnableEarlyCriticalSectionEventCreation ()
from /cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) thread 1
[Switching to thread 1 (Thread 6908.0x1344)]
#0 0x7748013d in ntdll!RtlEnableEarlyCriticalSectionEventCreation ()
from /cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0 0x7748013d in ntdll!RtlEnableEarlyCriticalSectionEventCreation ()
from /cygdrive/c/Windows/SysWOW64/ntdll.dll
#1 0x7748013d in ntdll!RtlEnableEarlyCriticalSectionEventCreation ()
from /cygdrive/c/Windows/SysWOW64/ntdll.dll
#2 0x74bb0bdd in WaitForMultipleObjectsEx () from
/cygdrive/c/Windows/syswow64/KERNELBASE.dll
#3 0x00000002 in ?? ()
#4 0x00000001 in ?? ()
#5 0x00000000 in ?? ()
(gdb) thread 2
[Switching to thread 2 (Thread 6908.0x1d34)]
#0 0x7747f8b1 in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0 0x7747f8b1 in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1 0x7747f8b1 in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#2 0x74bb0a91 in WaitForSingleObjectEx () from
/cygdrive/c/Windows/syswow64/KERNELBASE.dll
#3 0x00000034 in ?? ()
#4 0x00000000 in ?? ()
(gdb) thread 3
[Switching to thread 3 (Thread 6908.0x1d8c)]
#0 0x7747f8e5 in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0 0x7747f8e5 in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1 0x7747f8e5 in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#2 0x74bad348 in ReadFile () from
/cygdrive/c/Windows/syswow64/KERNELBASE.dll
#3 0x00000118 in ?? ()
#4 0x00000000 in ?? ()
(gdb) thread 4
[Switching to thread 4 (Thread 6908.0x1950)]
#0 0x7747000d in ntdll!LdrFindResource_U () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0 0x7747000d in ntdll!LdrFindResource_U () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1 0x774ff896 in ntdll!RtlQueryTimeZoneInformation ()
from /cygdrive/c/Windows/SysWOW64/ntdll.dll
#2 0x5dfded78 in ?? ()
#3 0x00000000 in ?? ()
Tom.
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