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From: "pedro at palves dot net" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/31555] New: Cannot attach to program after its main thread
 has exited, on Linux
Date: Mon, 25 Mar 2024 18:40:40 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31555

            Bug ID: 31555
           Summary: Cannot attach to program after its main thread has
                    exited, on Linux
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: pedro at palves dot net
  Target Milestone: ---

On Linux, it is not possible to attach to a process after its main thread h=
as
exited.  Ptrace does not let you attach to zombie threads.  E.g., with the
gdb.threads/leader-exit.exp test program:

$ gdb -p 1804363
...
Attaching to process 1804363
warning: process 1804363 is a zombie - the process has already terminated
ptrace: Operation not permitted.
(gdb)


This is possible on other systems -- at least on Windows it is.

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