Julia 1.2 crashes with try/catch invalid rational

[siroccal]

let
    for i = 1:2
        try 0//0 catch; end
    end
    if false; a = 0; end
    +a
end

or one-line let;for i=1:2;try 0//0 catch;end;end;if false;a=0;end;+a;end

This crashes with

Unreachable reached at 0x7f1cde7c33c3
signal (4): Illegal instruction
[...]
__libc_start_main at /lib64/libc.so.6 (unknown line)
unknown function (ip: 0x4015d4)

Removing or changing almost anything makes the bug disappear, including:

• removing the let block (a function still crashes)
• changing i=1:2 to i=1:1
• changing 0//0 to 0//1 or 0/0 (but 0/(0//1) still crashes)
• removing the try-catch
• changing false to true
• not assigning a in the if
• not doing something with a after the if

Julia Version 1.2.0
Commit c6da87ff4b (2019-08-20 00:03 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: AMD Phenom(tm) II X4 955 Processor
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-6.0.1 (ORCJIT, amdfam10)

I'm using the tarball downloaded from julialang.org.

[fredrikekre]

Thanks for the report, and for the nicely reduced example. I think this is fixed by #32830 which is already applied to the 1.3 backport branch (#33073), and marked for backport to 1.0.5 (#33075) if someone makes the manual backport.

[mortenpi]

I can confirm that the bug is fixed on the 1.2.1 backports branch (backports-release-1.2/03c9c72961), but still present on the 1.0.5 backports branch (backports-release-1.0/ec7c6f6187) at the moment.

[laborg]

Closing, because this was fixed a while ago and there won't be an update to 1.0 anymore.