Dear Arch-GCC team,

I stumbled over an issue at current gfortran:

Description:
Simple Fortran code fails after building without errors with segfault at runtime in line with formatted write statement:

* minimum working example:

program test_gfortran8_2_write_format_error
implicit none
real(8) :: real_dummy
real_dummy = 42.0_8
write(*,*) real_dummy
write(*,'("This is the answer to all questions:",f4.0)') real_dummy ! this line causes runtime error
end program test_gfortran8_2_write_format_error


* runtime error:

Program received signal SIGSEGV: Segmentation fault - invalid memory reference.

Backtrace for this error:
#0 0x7f0d8e13cdff in ???
#1 0x7f0d8e19ec84 in ???
#2 0x7f0d8e18e4e1 in ???
#3 0x7f0d8eae64c7 in data_transfer_init
at ../../../gcc-8-20171217/libgfortran/io/transfer.c:2791
#4 0x55ecc044926e in ???
#5 0x55ecc04492e8 in ???
#6 0x7f0d8e129222 in ???
#7 0x55ecc04490bd in ???
#8 0xffffffffffffffff in ???
Segmentation fault (core dumped)




Additional info:
* package version(s):
pacman -Si gcc
Repository : core
Name : gcc
Version : 8.2.1+20180831-1
Description : The GNU Compiler Collection - C and C++ frontends
Architecture : x86_64
URL : http://gcc.gnu.org
Licenses : GPL LGPL FDL custom
Groups : base-devel
Provides : gcc-multilib
Depends On : gcc-libs=8.2.1+20180831-1 binutils>=2.28 libmpc
Optional Deps : lib32-gcc-libs: for generating code for 32-bit ABI
Conflicts With : None
Replaces : gcc-multilib
Download Size : 32,89 MiB
Installed Size : 132,45 MiB
Packager : Evangelos Foutras <evangelos@foutrelis.com>
Build Date : Fr 31 Aug 2018 14:44:58 CEST
Validated By : MD5 Sum SHA-256 Sum Signature

* system:
Kernel: 4.17.19-1-MANJARO x86_64 bits: 64 Desktop: Xfce 4.12.4 Distro: Manjaro Linux


Steps to reproduce:
1) Compile test_gfortran8_2_write_format_error.f90 without additional options --> gfortran test_gfortran8_2_write_format_error.f90
2) run ./a.out

I had a similar error with gcc 7.2 at the beginning of this year: https://forum.manjaro.org/t/latest-update-to-gcc-7-2-1-20171128-causes-error-in-fortran-code-file-io-writing-lenghty-strings-in-formatted-form/36746
This old one was filed already. Custom builds with 7.2 from nightly had not this issue for the old bug. I found no information on this bug and I have not tried to compile GCC on my own this time. gfortran 7.2.0 runs fine with this code.

Best regards,
Johannes