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../. -I.././include -I.././lib  -D_FORTIFY_SOURCE=2 -g 
-O2 -fstack-protector-strong -Wformat -Werror=format-security -Wall
uname output: Linux jessie 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1+deb8u5 
(2015-10-09) x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.3
Patch Level: 30
Release Status: release

Description:
        setting HISTFILE=/dev/null and HISTSIZE=0 will replace /dev/null
        with regular file on exit (when running as root).

Repeat-By:
        start bash with root priviledges
        HISTFILE=/dev/null
        HISTSIZE=0
        exit

Fix:
        Check if HISTFILE points to regular file before unlink/recreate?

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