This is the mail archive of the
mailing list for the Cygwin project.
Re: Deadlocked cygrunsrv processes with strace message "_cygtls::remove: wait 0x0"
- From: "Max Bowsher" <maxb at ukf dot net>
- To: "Cygwin" <cygwin at cygwin dot com>
- Date: Mon, 11 Apr 2005 13:20:52 +0100
- Subject: Re: Deadlocked cygrunsrv processes with strace message "_cygtls::remove: wait 0x0"
- References: <013701c53e8a$d4959930$6508a8c0@chimaera>
Max Bowsher wrote:
Something about Apache 2 is causing its controlling cygrunsrv service
process to deadlock within the Cygwin DLL when it attempts to exit.
Attaching with strace to the hung process shows "_cygtls::remove: wait
Signals sent to the hung process are not delivered (as shown by strace),
a kill -9 will succeed.
Attaching with gdb does show anything that looks promising.
Does anyone have any suggestions that could save me some time, compared to
an in-depth study of the Cygwin DLL code in this area?
Ummmmm. Oh. Dear.
Since gdb backtrace wasn't helpful, I decided to try single stepping in gdb
onwards from the last strace output.
I found out that _cygtls.remove is being called successfully from
dll_entry(DLL_THREAD_DETACH), which returns, and the hang finally occurs
inside ZwTerminateThread() !!!
What now? Do I scream and give up?
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Problem reports: http://cygwin.com/problems.html