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File descriptor leak in nested functions

From: Charles Duffy
Subject: File descriptor leak in nested functions
Date: Thu, 15 Apr 2010 16:57:19 -0500

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL
-DHAVE_CONFIG_H   -I.  -I../bash -I../bash/include -I../bash/lib   -g -O2
uname output: Linux cduffyxp 2.6.31-20-generic #58-Ubuntu SMP Fri Mar 12
04:38:19 UTC 2010 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.0
Patch Level: 33
Release Status: release

        File descriptor leak in nested functions

        Run the following code:

                function get_fd_count() {
                    local fds
                    cd /proc/$$/fd; fds=( * ) # avoid a StackOverflow source
colorizer bug
                    echo "address@hidden"

                function fd_leak_func() {
                    echo ">> Current FDs: $(get_fd_count)"
                    read retval new_state < <(set +e; new_state=$(echo foo);
retval=$?; printf "%d %s\n" $retval $new_state)

                function parent_func() {
                    while fd_leak_func; do :; done


        If the issue occurs, the "Current FDs" value constantly increases,
        eventually leading to exhaustion.

        Note that parent_func is essential; if the while loop is removed
        the function and run at top level, the issue will not occur.

        This has also been observed against bash 3.2.25.

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