No error in execution without coverage report generation, problem in using coverage report generation

[Msmevol]

#shellspec -s /bin/bash -j 4
Running: /bin/bash [bash 4.2.37(1)-release] {--jobs 4}
.................................................

Finished in 9.77 seconds (user 4.74 seconds, sys 3.18 seconds) 49 examples, 0 failures
正常使用没有问题
#shellspec -s /bin/bash -j 4 --kcov
Running: /bin/bash [bash 4.2.37(1)-release] {--jobs 4}
...............................WWWWWWWFFF...F....

......
Code covered: 7.40%, Executed lines: 121, Instrumented lines: 1635
Aborted with status code [executor: 0] [reporter: 1] [error handler: 0]
Fatal error occurred, terminated with exit status 1.

测试函数中存在这样的语句
local realpath=realpath "/proc/$$/fd/255" 2> /dev/null
if [ "${realpath}" == "" ]; then
realpath="${G_STARTCMD}"
fi

不生成覆盖率的情况下：
+++ realpath /proc/3105/fd/255
++ local realpath= ++ '[' '' == '' ']'
++ realpath=/bin/bash
+++ basename /bin/bash
生成覆盖率的情况下
+++ realpath /proc/3760/fd/255
++ local 'realpath=/tmp/shellspec.1695279501.3544/kcov/ctr.d [specfiles]'
+++ echo kcov@/sf/vs/scripts-libs/file.sh@61@
++ '[' '/tmp/shellspec.1695279501.3544/kcov/ctr.d [specfiles]' == '' ']'
+++ echo kcov@/sf/vs/scripts-libs/file.sh@64@
++++ echo kcov@/sf/vs/scripts-libs/file.sh@64@
+++ basename '/tmp/shellspec.1695279501.3544/kcov/ctr.d [specfiles]'