Segfault on gamma(big(0)) on Julia v0.7

[dlfivefifty]

julia> using SpecialFunctions

julia> gamma(big(0))

signal (11): Segmentation fault: 11
in expression starting at no file:0
mpfr_lgamma at /Users/solver/Projects/julia7/usr/lib/libmpfr.6.dylib (unknown line)
gamma at /Users/solver/.julia/packages/SpecialFunctions/49Wj/src/gamma.jl:717
gamma at /Users/solver/.julia/packages/SpecialFunctions/49Wj/src/gamma.jl:557
jl_fptr_trampoline at /Users/solver/Projects/julia7/src/gf.c:1813
do_call at /Users/solver/Projects/julia7/src/interpreter.c:324
eval_stmt_value at /Users/solver/Projects/julia7/src/interpreter.c:363 [inlined]
eval_body at /Users/solver/Projects/julia7/src/interpreter.c:671
jl_interpret_toplevel_thunk_callback at /Users/solver/Projects/julia7/src/interpreter.c:788
unknown function (ip: 0xfffffffffffffffe)
unknown function (ip: 0x115a5b66f)
unknown function (ip: 0x0)
jl_interpret_toplevel_thunk at /Users/solver/Projects/julia7/src/interpreter.c:797
jl_toplevel_eval_flex at /Users/solver/Projects/julia7/src/toplevel.c:814
jl_toplevel_eval_in at /Users/solver/Projects/julia7/src/builtins.c:631
eval at ./boot.jl:319
eval_user_input at /Users/solver/Projects/julia7/usr/share/julia/stdlib/v0.7/REPL/src/REPL.jl:85
macro expansion at /Users/solver/Projects/julia7/usr/share/julia/stdlib/v0.7/REPL/src/REPL.jl:116 [inlined]
#28 at ./task.jl:257
jl_fptr_trampoline at /Users/solver/Projects/julia7/src/gf.c:1813
jl_apply at /Users/solver/Projects/julia7/src/./julia.h:1533 [inlined]
start_task at /Users/solver/Projects/julia7/src/task.c:268
Allocations: 3659197 (Pool: 3658607; Big: 590); GC: 7
Segmentation fault: 11

[dlfivefifty]

julia> versioninfo()
Julia Version 0.7.0-alpha.236
Commit 2706a8d475 (2018-06-22 19:23 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin17.6.0)
  CPU: Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-6.0.0 (ORCJIT, skylake)
Environment:
  JULIA_VERSION = 0.6

[ararslan]

I can reproduce. Here's the output when running with LLDB:

* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
    frame #0: 0x000000011554ed99 libmpfr.6.dylib`mpfr_lgamma(y=0x0000000110a04df0, signp=0x0000000110a04dc0, x=0x0000000000000000, rnd=1606412720) at lngamma.c:772 [opt]
   769
   770 	  *signp = 1;  /* most common case */
   771
-> 772 	  if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x)))
   773 	    {
   774 	      if (MPFR_IS_NAN (x))
   775 	        {
Target 0: (julia) stopped.

Did this start recently, do you know? The MPFR-related changes that have happened in Base since the 0.6.x series have been JuliaLang/julia#27331 (recent) and JuliaLang/julia#25710 (January).

[dlfivefifty]

Between 12 and 3 days ago

https://travis-ci.org/ajt60gaibb/FastGaussQuadrature.jl/builds/390946260