Segmentation fault in pat_subst

Bash `devel' crashes under the following circumstances: | dualbus@system76-pc:/tmp/build-bash-devel$ CFLAGS='-O0 -ggdb' ~/src/gnu/bash/configure --with-bash-malloc | (...) | dualbus@system76-pc:/tmp/build-bash-devel$ make -j$(nproc) | (...) | dualbus@system76-pc:/tmp/build-bash-devel$ ./bash -c

crash (unhandled SIGPIPE) on write to closed file descriptor

Configuration Information [Automatically generated, do not change]: Machine: x86_64 OS: linux-gnu Compiler: gcc Compilation CFLAGS: -g -O2 -fdebug-prefix-map=/build/bash-2bxm7h/bash-5.0=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wno-parentheses -Wno-format-security uname