Failures:

  1) seg fault detects stack overflow on the main stack
     Failure/Error: error.should contain("Stack overflow")

       Expected:   "Invalid memory access (signal 11) at address 0xffffc59b7e30\n[0xaab6d0310cb8] *CallStack::print_backtrace:Int32 +100\n[0xaab6d03034d0] __crystal_sigfault_handler +208\n[0xfff785619964] __setjmp +56\n[0xaab6d03444c0] *Pointer(Hash::Entry(String, NamedTuple(time: Time, location: Time::Location)) | Nil) +136\n[0xaab6d0303530] *foo:NoReturn +48\n[0xaab6d0308fdc] *foo:NoReturn +23260 (1522 times)\n[0xaab6d02f9130] __crystal_main +2072\n[0xaab6d034690c] *Crystal::main_user_code<Int32, Pointer(Pointer(UInt8))>:Nil +8\n[0xaab6d0346864] *Crystal::main<Int32, Pointer(Pointer(UInt8))>:Int32 +40\n[0xaab6d02ffedc] main +8\n[0xfff7855ee734] ???\n"
       to include: "Stack overflow"

     # spec/std/kernel_spec.cr:249

  2) TCPServer .new using IPv4 reuse_port raises when not binding with reuse_port
     Failure/Error: expect_raises_errno(Errno::EADDRINUSE, {% if flag?(:linux) %}"listen: "{% else %}"bind: "{% end %}) do

       Expected Errno with "listen: ", got #<Errno: bind: Address in use> with backtrace:
         # src/socket/tcp_server.cr:73:15 in 'initialize:reuse_port'
         # src/socket/tcp_server.cr:32:3 in 'new:reuse_port'
         # spec/std/socket/tcp_server_spec.cr:66:14 in '->'
         # src/spec/methods.cr:255:3 in 'it'
         # spec/std/socket/tcp_server_spec.cr:51:9 in '->'
         # src/spec/context.cr:158:7 in 'describe'
         # src/spec/methods.cr:16:5 in 'describe'
         # spec/std/socket/tcp_server_spec.cr:42:7 in '->'
         # spec/std/socket/spec_helper.cr:255:3 in '->'
         # src/spec/context.cr:158:7 in 'describe'
         # src/spec/methods.cr:16:5 in 'describe'
         # spec/std/socket/spec_helper.cr:11:3 in 'each_ip_family'
         # spec/std/socket/tcp_server_spec.cr:6:5 in '->'
         # src/spec/context.cr:255:3 in 'describe'
         # src/spec/methods.cr:16:5 in 'describe'
         # spec/std/socket/tcp_server_spec.cr:5:3 in '->'
         # src/spec/context.cr:255:3 in 'describe'
         # src/spec/methods.cr:16:5 in 'describe'
         # spec/std/socket/tcp_socket_spec.cr:1:1 in '__crystal_main'
         # src/crystal/main.cr:97:5 in 'main_user_code'
         # src/crystal/main.cr:86:7 in 'main'
         # src/crystal/main.cr:106:3 in 'main'
         # ???

     # spec/std/socket/tcp_server_spec.cr:53

  3) TCPServer .new using IPv6 reuse_port raises when not binding with reuse_port
     Failure/Error: expect_raises_errno(Errno::EADDRINUSE, {% if flag?(:linux) %}"listen: "{% else %}"bind: "{% end %}) do

       Expected Errno with "listen: ", got #<Errno: bind: Address in use> with backtrace:
         # src/socket/tcp_server.cr:73:15 in 'initialize:reuse_port'
         # src/socket/tcp_server.cr:32:3 in 'new:reuse_port'
         # spec/std/socket/tcp_server_spec.cr:66:14 in '->'
         # src/spec/methods.cr:255:3 in 'it'
         # spec/std/socket/tcp_server_spec.cr:51:9 in '->'
         # src/spec/context.cr:158:7 in 'describe'
         # src/spec/methods.cr:16:5 in 'describe'
         # spec/std/socket/tcp_server_spec.cr:42:7 in '->'
         # spec/std/socket/spec_helper.cr:255:3 in '->'
         # src/spec/context.cr:158:7 in 'describe'
         # src/spec/methods.cr:16:5 in 'describe'
         # spec/std/socket/spec_helper.cr:15:3 in 'each_ip_family'
         # spec/std/socket/tcp_server_spec.cr:6:5 in '->'
         # src/spec/context.cr:255:3 in 'describe'
         # src/spec/methods.cr:16:5 in 'describe'
         # spec/std/socket/tcp_server_spec.cr:5:3 in '->'
         # src/spec/context.cr:255:3 in 'describe'
         # src/spec/methods.cr:16:5 in 'describe'
         # spec/std/socket/tcp_socket_spec.cr:1:1 in '__crystal_main'
         # src/crystal/main.cr:97:5 in 'main_user_code'
         # src/crystal/main.cr:86:7 in 'main'
         # src/crystal/main.cr:106:3 in 'main'
         # ???

     # spec/std/socket/tcp_server_spec.cr:53

Finished in 41:20 minutes
15287 examples, 3 failures, 0 errors, 12 pending

Failed examples:

crystal spec spec/std/kernel_spec.cr:235 # seg fault detects stack overflow on the main stack
crystal spec spec/std/socket/tcp_server_spec.cr:51 # TCPServer .new using IPv4 reuse_port raises when not binding with reuse_port
crystal spec spec/std/socket/tcp_server_spec.cr:51 # TCPServer .new using IPv6 reuse_port raises when not binding with reuse_port
make: *** [Makefile:86: spec] Error 1
>>> ERROR: crystal: check failed