[screen-devel] [bug #63619] screen crashes on reattach in st terminal

[Axel Svensson]

URL:
  <https://savannah.gnu.org/bugs/?63619>

                 Summary: screen crashes on reattach in st terminal
                 Project: GNU Screen
               Submitter: axelsvensson
               Submitted: Wed 04 Jan 2023 02:08:13 PM UTC
                Category: Crash/Freeze/Infloop
                Severity: 3 - Normal
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
                 Release: 4.8.0
         Discussion Lock: Any
           Fixed Release: None
         Planned Release: None
           Work Required: None


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Follow-up Comments:


-------------------------------------------------------
Date: Wed 04 Jan 2023 02:08:13 PM UTC By: Axel Svensson <axelsvensson>
To reproduce:



# Install st terminal
> git clone https://git.suckless.org/st
> cd st
> git checkout e5e959835b195c023d1f685ef4dbbcfc3b5120b2
> make install

# Check that you get the expected termcap
> sha256sum /etc/terminfo/s/st-256color
f3c62ac3c07d4e90627be14d8af0c729d2c7592ef2a1da2e3baded1814a924e6 
/etc/terminfo/s/st-256color

# Start st and do the rest from inside this terminal.
> st

# Check that the TERM variable is set correctly
> echo $TERM
st-256color

# Compile and run screen from the commit where the problem was introduced
> git clone https://git.savannah.gnu.org/git/screen.git
> cd screen/src
> git checkout 241553f21ce38eae821ea4c1e12241365563d444
> git clean -fdx && ./autogen.sh && ./configure && make
> ./screen -RS a
# Press Ctrl+A D to detach
# Reattach
> ./screen -RS a



Expected:
screen reattaches

Actual:
screen crashes with message "[screen caught signal 11. (core dumped)]".

This behavior depends to some degree on the constant TERMCAP_BUFSIZE in
src/os.h (with a value of 1023 in the referenced snapshot).
If this constant is set to a value in the range 914-1025, screen will crash on
reattach as described above under "Actual".
If it is set to a value in the range 1026-1105, screen will instead hang on
detach.
A value of 1106 or above will produce the expected behavior.








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