programm fails when compiled with ldc under OSX

[ikod]

Hello

Program crashes when compiled with ldc2 and works ok when compiled with dmd or when tested on linux

details
OSX 10.15.1, ldc2 - 1.19.0-beta1
reproduce.txt

(lldb) target create "./test"
Current executable set to './test' (x86_64).
(lldb) run
Process 82507 launched: '/tmp/test/test' (x86_64)
test.test.a:
Process 82507 stopped
* thread #2, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x00000001001b6f89 test`_D2rt8monitor_13ensureMonitorFNbC6ObjectZPOSQBqQBq7Monitor + 217
test`_D2rt8monitor_13ensureMonitorFNbC6ObjectZPOSQBqQBq7Monitor:
->  0x1001b6f89 <+217>: movq   (%rax), %rax
    0x1001b6f8c <+220>: testb  $0x1, 0x69(%rax)
    0x1001b6f90 <+224>: jne    0x1001b6ecf               ; <+31>
    0x1001b6f96 <+230>: movl   $0x1, %edi
Target 0: (test) stopped.
(lldb) bt
* thread #2, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x00000001001b6f89 test`_D2rt8monitor_13ensureMonitorFNbC6ObjectZPOSQBqQBq7Monitor + 217
    frame #1: 0x0000000100b046c0
    frame #2: 0x0000000100001110 test`_D4testQf17__unittest_L18_C1FZv at test.d:24:9
    frame #3: 0x0000000100014fd1 test`_D13unit_threaded6runner10reflection__T16moduleUnitTests_S4testQfZQBbFZ__T18addMemberUnittestsSQBlQBoZQBcMFNaNbZ9__lambda2MFZv at reflection.d:268:46
    frame #4: 0x0000000100054d1a test`_D13unit_threaded6runner8testcase16FunctionTestCase4testMFZv(this=0x0000000100b001c0) at testcase.d:218:9
    frame #5: 0x0000000100054d95 test`_D13unit_threaded6runner8testcase15BuiltinTestCase4testMFZv(this=0x0000000100b001c0) at testcase.d:244:13
    frame #6: 0x00000001000546f3 test`_D13unit_threaded6runner8testcase8TestCase6doTestMFZ12__dgliteral2MFNaNiNfZv at testcase.d:101:19
    frame #7: 0x0000000100054531 test`_D13unit_threaded6runner8testcase8TestCase__T5checkTvZQjMFLvZb(this=0x0000000100b001c0, expression=void delegate() @ 0x0000700004755d08) at testcase.d:111:13
    frame #8: 0x00000001000542e1 test`_D13unit_threaded6runner8testcase8TestCase6doTestMFZv(this=0x0000000100b001c0) at testcase.d:101:9
    frame #9: 0x0000000100054182 test`_D13unit_threaded6runner8testcase8TestCase6opCallMFZAAya(this=0x0000000100b001c0) at testcase.d:51:9
    frame #10: 0x00000001000553dc test`_D13unit_threaded6runner9testsuite7runTestFCQBqQBe8testcase8TestCaseZAAya(test=0x0000000100b001c0) at testsuite.d:15:5
    frame #11: 0x000000010005afeb test`_D3std11parallelism8TaskPool__T4amapS_D13unit_threaded6runner9testsuite7runTestFCQBqQBe8testcase8TestCaseZAAyaZ__TQDfTAQBnZQDoMFQkZ4doItMFZv at parallelism.d:1805:29
    frame #12: 0x00000001000ebbe1 test`_D3std11parallelism8TaskPool5doJobMFPSQBkQBj12AbstractTaskZv + 17
    frame #13: 0x00000001000ebd8b test`_D3std11parallelism8TaskPool13startWorkLoopMFZv + 139
    frame #14: 0x0000000100191f05 test`thread_entryPoint + 373
    frame #15: 0x00007fff70cc7d36 libsystem_pthread.dylib`_pthread_start + 125
    frame #16: 0x00007fff70cc458f libsystem_pthread.dylib`thread_start + 15
(lldb) 

[ikod]

Forgot to mention that it also works ok if started with --DRT-gcopt="disable:1"

[rainers]

Does it also work with disabled parallel marking by the GC, i.e. with --DRT-gcopt="parallel:0"?

[ikod]

Does it also work with disabled parallel marking by the GC, i.e. with --DRT-gcopt="parallel:0"?

no, still fails:

$ ./test --DRT-gcopt="parallel:0"
test.test.a:
Segmentation fault: 11

[kinke]

This might be a duplicate of #2187 and fixed in v1.19 final.