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Re: setup hangs during postinstall

Christopher Faylor wrote:
>On Thu, Oct 09, 2003 at 06:17:08PM -0500, Brian Ford wrote:
>>FOO=`cygpath -S`
>>but using #!/bin/sh doesn't.  likewise, strace hangs here:
>>FOO=`strace -o /tmp/cygpath.strace cygpath -S`
>>but not using #!/bin/sh.
>>Neither hang if setup is launched from bash instead of explorer.
>Hmm.  Maybe I missed this point before.  I never run setup from
>In any event, can you set the CYGWIN_DEBUG=cygpath and maybe do some
>search and destroy debugging to see precisely where it is hanging?
I finally got some time to look at this.  Preliminary results follow.
I'll try to poke more this afternoon if time permits.

Since setup must be launched from explorer to hang, I set
CYGWIN_DEBUG=cygpath in my system environment variables and rebooted.  To
make sure it worked, I launched a bash under rxvt and did a "cygpath -S".
Up popped the gdb cmd shell.  But, under setup, no dice.

cygpath hangs just like before.  The stack trace looks a little different.
Note that I have not had time to hand decode the holes in the trace yet,
but it looks to me like a startup problem before the CYGWIN_DEBUG
handling code.  A "fork exec copy" problem maybe?  I know that's vague,
but I think you know what I mean.

(gdb) info threads
  3 thread 213.0xb5  0x77f7645d in _system_dlls__ ()
  2 thread 213.0xd3  0x77f67fc7 in _system_dlls__ ()
* 1 thread 213.0xd7  0x77f6838b in _system_dlls__ ()
#0  0x77f6838b in _system_dlls__ ()
#1  0x77f1d06a in _system_dlls__ ()
#2  0x61091027 in WFMO (nCount=3, lpHandles=0x1, fWaitAll=2147348480,
    at ../../../../cygwin/winsup/cygwin/
#3  0x6109344b in spawn_guts(char const*, char const* const*, char const* const*, int) (prog_arg=0xa044050 "/usr/bin/cygpath.exe", argv=0xa044b88,
    envp=0xa044160, mode=3) at ../../../../cygwin/winsup/cygwin/
#4  0x6109477e in spawnve (mode=3, path=0xa044050 "/usr/bin/cygpath.exe",
    argv=0xa044b88, envp=0xa044160)
    at ../../../../cygwin/winsup/cygwin/
#5  0x6102835b in execve (path=0xa044050 "/usr/bin/cygpath.exe",
    argv=0xa044b88, envp=0xa044160)
    at ../../../../cygwin/winsup/cygwin/
#6  0x004143c5 in ?? ()
#24 0x00403a09 in CloseHandle@4 ()
#25 0x0040195f in get_short_paths(char*) (path=0x2 <Address 0x2 out of bounds>)
    at ../../../../cygwin/winsup/utils/
#26 0x610055c8 in dll_crt0_1() ()
    at ../../../../cygwin/winsup/cygwin/
#27 0x61005a7d in _dll_crt0 () at ../../../../cygwin/winsup/cygwin/
#28 0x0047b901 in ?? ()
(gdb) thread 2
[Switching to thread 2 (thread 213.0xd3)]#0  0x77f67fc7 in _system_dlls__ ()
(gdb) bt
#0  0x77f67fc7 in _system_dlls__ ()
#1  0x610907c6 in wait_sig(void*) (self=0x610f0b40)
    at ../../../../cygwin/winsup/cygwin/
#2  0x6100302e in cygthread::stub(void*) (arg=0x610f0b40)
    at ../../../../cygwin/winsup/cygwin/
#3  0x77f04eeb in _system_dlls__ ()

Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
Phone: 314-551-8460
Fax:   314-551-8444

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