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Re: Bash hangs in WaitForMultipleObjects
- From: Igor Pechtchanski <pechtcha at cs dot nyu dot edu>
- To: jreif at speakeasy dot net
- Cc: cygwin at cygwin dot com
- Date: Fri, 11 Jun 2004 11:39:04 -0400 (EDT)
- Subject: Re: Bash hangs in WaitForMultipleObjects
- References: <W245535631253161086924759@webmail2>
- Reply-to: cygwin at cygwin dot com
On Fri, 11 Jun 2004, jreif wrote:
> I have bash processes that hang sometimes and have been investigating
> with gdb. I have gathered the output from gdb about an offending
> process and included below. I am running 1.5.9 of the cygwin dll, I
> have searched through other postings and in google. Have seen some
> references to hanging in bash but mostly occurring with rsync or ssh.
> This is very reproducable for me. Any help is appreciated.
Ok, time for a new acronym: <http://cygwin.com/acronyms/#PCYMTWLL>. :-)
> (gdb) attach 7804
> Attaching to process 7804
> ---Type <return> to continue, or q <return> to quit---
> [Switching to thread 7804.0x18fc]
> (gdb) bt
> #0 0x77fa144c in ntdll!DbgUiConnectToDbg () from /cygdrive/c/WINNT/system32/ntdll.dll
> #1 0x7c57feb4 in KERNEL32!DebugActiveProcess () from /cygdrive/c/WINNT/system32/KERNEL32.DLL
> #2 0x61003e24 in getprogname () from /usr/bin/cygwin1.dll
> #3 0x61003dda in getprogname () from /usr/bin/cygwin1.dll
> (gdb) thread 3
> [Switching to thread 3 (thread 7804.0x14d8)]#0 0x77f9323e in ntdll!ZwWaitForMultipleObjects () from /cygdrive/c/WINNT/system32/ntdll.dll
> (gdb) bt
> #0 0x77f9323e in ntdll!ZwWaitForMultipleObjects () from /cygdrive/c/WINNT/system32/ntdll.dll
> #1 0x7c59a059 in WaitForMultipleObjectsEx () from /cygdrive/c/WINNT/system32/KERNEL32.DLL
> #2 0x7c599f6c in WaitForMultipleObjects () from /cygdrive/c/WINNT/system32/KERNEL32.DLL
> #3 0x61003e24 in getprogname () from /usr/bin/cygwin1.dll
> #4 0x61003dda in getprogname () from /usr/bin/cygwin1.dll
Doesn't look too out-of-order to me... It's normal to have one or two
threads waiting in WaitForMultipleObjects (on signal handling and such).
What are the other threads doing? (Hint: 'info threads').
P.S. If *all* of the threads are in that method, _then_ something's wrong.
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