Meet a crash like this when running certain part of my codes.
Unreachable reached at 0x11a03de66
signal (4): Illegal instruction: 4
in expression starting at no file:0
top-level scope at ./REPL[17]:2 [inlined]
top-level scope at ./none:0
jl_fptr_trampoline at /Users/osx/buildbot/slave/package_osx64/build/src/gf.c:1829
jl_toplevel_eval_flex at /Users/osx/buildbot/slave/package_osx64/build/src/toplevel.c:825
jl_toplevel_eval_in at /Users/osx/buildbot/slave/package_osx64/build/src/builtins.c:633
eval at ./boot.jl:319
eval_user_input at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v0.7/REPL/src/REPL.jl:85
macro expansion at /Users/osx/buildbot/slave/package_osx64/build/usr/share/julia/stdlib/v0.7/REPL/src/REPL.jl:117 [inlined]
#28 at ./task.jl:262
jl_apply at /Users/osx/buildbot/slave/package_osx64/build/src/./julia.h:1538 [inlined]
start_task at /Users/osx/buildbot/slave/package_osx64/build/src/task.c:268
Allocations: 58071594 (Pool: 58060526; Big: 11068); GC: 287
Illegal instruction: 4
My question is, how to track down the causes of such crash?