I've had keychain hang twice now while running "ssh-add -l". It happened with an older snapshot and again this morning with a DLL I built from CVS yesterday that corresponds to the 20050316 snapshot.
I've been able to reproduce this hang at will with the 20050316 snapshot. I start an ssh-agent process, add a key to it, and then run "ssh-add -l" in a loop in two windows. This generally triggers the hang in a few minutes.
I've captured strace output from ssh-agent and the two ssh-add processes. The output is available here:
http://mysite.verizon.net/res00a7j/ssh-agent.zip http://mysite.verizon.net/res00a7j/ssh-add.1.strace.txt http://mysite.verizon.net/res00a7j/ssh-add.1.strace.old.txt http://mysite.verizon.net/res00a7j/ssh-add.2.strace.txt http://mysite.verizon.net/res00a7j/ssh-add.2.strace.old.txt
The ssh-agent strace out is compressed because it's 2.4MB uncompressed. The uncompressed version is here if you're brave:
http://mysite.verizon.net/res00a7j/ssh-agent.strace.txt
The strace's from the two ssh-add processes that hung are ssh-add.1.strace.txt and ssh-add.2.strace.txt. The "*.old.txt" traces are from the previous successful invocation of ssh-add in the two loops.
I used this simple script to capture the ssh-add traces:
#!/bin/bash
num=$1
while true; do
[ -f /c/temp/ssh-add.$num.strace ] && \
mv /c/temp/ssh-add.$num.strace /c/temp/ssh-add.$num.strace.2
date
strace -o /c/temp/ssh-add.$num.strace ssh-add -l
doneI ran it in two windows as "./ssh-add-loop.sh 1" and "./ssh-add-loop.sh 2".
Two things caught my eye when looking at the traces. In ssh-add.2.strace.txt, I saw this:
252 122112 [main] ssh-add 4120 fhandler_socket::signal_secret_event: signaled secret_event 121 122233 [main] ssh-add 4120 fhandler_socket::eid_pipe_name: \\.\pipe\cygwin-unix-/tmp/ssh-wxIlND2024/agent.2024 2556 124789 [main] ssh-add 4120 fhandler_socket::connect: Receiving eid credentials failed: Win32 error 231
although the eid credentials were received successfully by ssh-add.1.
Also, at the end of the traces for the two hung ssh-add processes and ssh-agent, I saw this.
7963651 8097324 [sig] ssh-add 4120 pinfo::init: execed process windows pid 4884, cygwin pid 5728 182 8097506 [sig] ssh-add 4120 pinfo::init: execed process windows pid 5892, cygwin pid 3552 115 8097621 [sig] ssh-add 4120 pinfo::init: execed process windows pid 3104, cygwin pid 4996
This repeated many times (180 times for ssh-add.2). This occurred when I interrupted the processes with CTRL-C.
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