Subject: readline event-hook may hang while waiting on input Package: libreadline8t64 Source: readline X-Debbugs-Cc: [email protected] Version: 8.3-1 Severity: important Tags: patch
readline 8.3 contains a bug, identified upstream, with the event-hook leading to complete hang waiting for input. https://lists.gnu.org/archive/html/bug-readline/2025-07/msg00012.html upstream patch at : https://ftp.gnu.org/gnu/readline/readline-8.3-patches/readline83-001 This affects packages such as octave. Reproducible: * apt install octave * octave --no-gui * attempt input. Tracked in Ubuntu at : https://bugs.launchpad.net/ubuntu/+source/readline/+bug/2118818 attached is a unified diff version with *somewhat* close to dep3 headers (i make no promises) -- ----------------------- Dr. John Chittum Engineering Manager, Canonical, Debcrafters ************************************* Readline-Release: 8.3 Patch-ID: readline83-001 Bug-Reported-by: Dmitri A. Sergatskov <[email protected]> Bug-Reference-ID: <CAO+XyQ+ipUzFiXvRrDbTstfm1heZrerjvZGVaC60y= [email protected]> Description: If an application uses readline's event hook, it is called while waiting for input. There is a bug in the function that waits for available input that causes it not to read that input under certain circumstances, resulting in a loop where the event hook continues to be called, but there is no input to stop it. From: Chet Ramey <[email protected]> Origin: https://ftp.gnu.org/gnu/readline/readline-8.3-patches/readline83-001 Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/readline/+bug/2118818 Reviewed-by: John Chittum <[email protected]> --- a/input.c +++ b/input.c @@ -261,13 +261,16 @@ input = 0; tty = fileno (rl_instream); · - /* Move this up here to give it first shot, but it can't set chars_avail */ + /* Move this up here to give it first shot, but it can't set chars_avail, + so we assume a single character is available. */ /* XXX - need rl_chars_available_hook? */ if (rl_input_available_hook) { result = (*rl_input_available_hook) (); if (result == 0) result = -1; + else + chars_avail = 1; } · #if defined (HAVE_PSELECT) || defined (HAVE_SELECT) @@ -285,6 +288,7 @@ #endif if (result <= 0) »······return 0;»······/* Nothing to read. */ + result = -1;»····/* there is something, so check how many chars below */ } #endif · --- a/patchlevel +++ b/patchlevel @@ -1,3 +1,3 @@ # Do not edit -- exists only for use by patch · -0 +1
