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bug#32381: 27.0.50; crash in json tests


From: Andy Moreton
Subject: bug#32381: 27.0.50; crash in json tests
Date: Tue, 7 Aug 2018 00:15:42 +0100
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Running "make check" for a Windows mingw64 x86_64 build (configured
--with-json) results in a crash in the tests from test/src/json-tests.el.

Attaching GDB shows:

(gdb) bt
#0 0x00007ffdd5e8c903 in KERNELBASE!DebugBreak () from C:\WINDOWS\System32\KernelBase.dll #1 0x000000040021af70 in emacs_abort () at C:/emacs/git/emacs/master/src/w32fns.c:10775 #2 0x00000004000efb6c in terminate_due_to_signal (sig=0xb, backtrace_limit=<optimized out>) at C:/emacs/git/emacs/master/src/emacs.c:399 #3 0x00000004001102b0 in handle_fatal_signal (sig=0xcf0000, address@hidden) at C:/emacs/git/emacs/master/src/sysdep.c:1769 #4 0x000000040010ff58 in deliver_thread_signal (sig=0xb, handler=0x4001102a2 <handle_fatal_signal>) at C:/emacs/git/emacs/master/src/sysdep.c:1743 #5 0x000000040010ff75 in deliver_fatal_thread_signal (sig=0xcf0000) at C:/emacs/git/emacs/master/src/sysdep.c:1781 #6 0x000000040028348c in _gnu_exception_handler (exception_data=0xbf5610) at C:/repo/mingw-w64-crt-git/src/mingw-w64/mingw-w64-crt/crt/crt_handler.c:223 #7 0x00007ffdd9327c58 in msvcrt!__C_specific_handler () from C:\WINDOWS\System32\msvcrt.dll #8 0x00007ffdd97beced in ntdll!.chkstk () from C:\WINDOWS\SYSTEM32\ntdll.dll #9 0x00007ffdd9726c86 in ntdll!RtlWalkFrameChain () from C:\WINDOWS\SYSTEM32\ntdll.dll #10 0x00007ffdd97bdc1e in ntdll!KiUserExceptionDispatcher () from C:\WINDOWS\SYSTEM32\ntdll.dll #11 0x00007ffdd9730317 in ntdll!RtlFreeHeap () from C:\WINDOWS\SYSTEM32\ntdll.dll
#12 0x00007ffdd93198bc in msvcrt!free () from C:\WINDOWS\System32\msvcrt.dll
#13 0x0000000400187d8d in do_one_unbind (address@hidden, address@hidden, address@hidden) at C:/emacs/git/emacs/master/src/eval.c:3473 #14 0x0000000400188f75 in unbind_to (address@hidden, value=XIL(0x41cc154)) at C:/emacs/git/emacs/master/src/eval.c:3593 #15 0x0000000400274980 in Fjson_serialize (nargs=<optimized out>, args=0xbf69b8) at C:/emacs/git/emacs/master/src/json.c:610 #16 0x000000040018b92f in funcall_subr (subr=0x4006657e0 <Sjson_serialize>, address@hidden, address@hidden) at C:/emacs/git/emacs/master/src/eval.c:2877
...
[another 150 frames omitted]

Lisp Backtrace:
"json-serialize" (0xbf69b8)
"apply" (0xbf69b0)
"byte-optimize-form-code-walker" (0xbf6ee0)
"byte-optimize-form" (0xbf7148)
"mapcar" (0xbf73a0)
"byte-optimize-form-code-walker" (0xbf78e0)
"byte-optimize-form" (0xbf7b80)
"byte-optimize-body" (0xbf7de0)
"byte-optimize-form-code-walker" (0xbf8310)
"byte-optimize-form" (0xbf85b0)
"byte-optimize-form-code-walker" (0xbf8ae0)
"byte-optimize-form" (0xbf8d60)
0xba8e40 PVEC_COMPILED
"mapcar" (0xbf91c8)
"byte-optimize-form-code-walker" (0xbf9700)
"byte-optimize-form" (0xbf99a0)
"byte-optimize-body" (0xbf9bf8)
"byte-optimize-form-code-walker" (0xbfa130)
"byte-optimize-form" (0xbfa3c8)
"byte-compile-top-level" (0xbfa6a0)
"byte-compile-lambda" (0xbfa9e8)
"byte-compile-function-form" (0xbfac38)
"byte-compile-form" (0xbfb028)
"mapc" (0xbfb238)
"byte-compile-normal-call" (0xbfb4a8)
"byte-compile-form" (0xbfb898)
"mapc" (0xbfbaa8)
"byte-compile-normal-call" (0xbfbd18)
"byte-compile-form" (0xbfc120)
"byte-compile-keep-pending" (0xbfc360)
"byte-compile-file-form" (0xbfc588)
0xb2ee40 PVEC_COMPILED
"byte-compile-recurse-toplevel" (0xbfc9e8)
0xbcbca0 PVEC_COMPILED
"mapcar" (0xbfce28)
"byte-compile-recurse-toplevel" (0xbfd068)
"byte-compile-toplevel-file-form" (0xbfd270)
0xb2af70 PVEC_COMPILED
"byte-compile-from-buffer" (0xbfd890)
"byte-compile-file" (0xbfdcb8)
"batch-byte-compile-file" (0xbfdf40)
"batch-byte-compile" (0xbfe268)
"command-line-1" (0xbfe930)
"command-line" (0xbff1c8)
"normal-top-level" (0xbff550)

(gdb) frame 15
#15 0x0000000400274980 in Fjson_serialize (nargs=<optimized out>, args=0xbf69b8) at C:/emacs/git/emacs/master/src/json.c:610
610       return unbind_to (count, json_build_string (string));

(gdb) info locals
count = 0x6b
conf = {
  object_type = json_object_hashtable,
  null_object = XIL(0x15e0),
  false_object = XIL(0xa80)
}
json = <optimized out>
string = 0x4206870 "{\"abc\":[1,2,true],\"def\":null}"
(gdb)









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