Print logfile when test case crash

[chenyukang]

Because we run bash with -e, when a test case crash, the parent process will also exit, without print out the logfile.
This is confusing for run a single crash test case since the printed result is same with a successful one.
Like the "mounts/mounts.t"

[codecov-commenter]

Codecov Report

Merging #265 (8c86ef8) into main (7f6bc2c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #265   +/-   ##
=======================================
  Coverage   40.89%   40.89%           
=======================================
  Files          15       15           
  Lines        1445     1445           
  Branches      410      410           
=======================================
  Hits          591      591           
  Misses        649      649           
  Partials      205      205           

[utam0k]

cool!