[Bug server/26116] New: gdbserver with zsh as the shell hangs at startup when .zshenv forks

["simark at simark dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26116

            Bug ID: 26116
           Summary: gdbserver with zsh as the shell hangs at startup when
                    .zshenv forks
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: server
          Assignee: unassigned at sourceware dot org
          Reporter: simark at simark dot ca
  Target Milestone: ---

When using zsh as the shell and a command that forks in ~/.zshenv, like
`/bin/echo` here (plain `echo` is the shell builtin, which doesn't fork):

$ cat ~/.zshenv 
echo Before
/bin/echo Hello
echo After

... gdbserver hangs at startup

$ SHELL=zsh ./gdbserver localhost:9000 /bin/ls 
Before
Hello
<hangs here>

Note that when using a similar bash feature, the BASH_ENV environment variable,
it doesn't hang:

$ SHELL=bash BASH_ENV=~/.zshenv ./gdbserver localhost:9000 /bin/ls 
Before
Hello
After
Process /bin/ls created; pid = 745096
Listening on port 9000

It's also possible that the issue is in zsh, but I haven't dug enough to
understand what's happening exactly.

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