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From: "simark at simark dot ca" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug server/26116] New: gdbserver with zsh as the shell hangs at
 startup when .zshenv forks
Date: Sun, 14 Jun 2020 02:49:04 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26116

            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=20
echo Before
/bin/echo Hello
echo After

... gdbserver hangs at startup

$ SHELL=3Dzsh ./gdbserver localhost:9000 /bin/ls=20
Before
Hello
<hangs here>

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

$ SHELL=3Dbash BASH_ENV=3D~/.zshenv ./gdbserver localhost:9000 /bin/ls=20
Before
Hello
After
Process /bin/ls created; pid =3D 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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