command substitution when timing grouped commands fails

Configuration Information [Automatically generated, do not change]: Machine: x86_64 OS: linux-gnu Compiler: gcc Compilation CFLAGS: -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wall uname output: Linux abyssal 6.4.0-3-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.4.11-1 (2023-08-17)

bash signal during wait + read causes unkillable 100% CPU usage

Configuration Information [Automatically generated, do not change]: Machine: i686 OS: linux-gnu Compiler: gcc Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale'