On Fri, 24 May 2024, Jeremy Drake wrote:
> Windbg reports that ldh.exe is already being debugged. I was able to do a
> "non-invasive" attach to ldh.exe in windbg, but it doesn't seem to be able
> to deal with the split debug symbols (gnulink?). I don't know if gdb can
> do a non-invasive attach like that (or open a minidump assuming one could
> be made from a non-invasize attach in windbg).
Seems it can, and at least lldb can load a minidump (unfortunately it's
not showing source file/line info like gdb does):
(lldb) bt
* thread #1, stop reason = Exception 0x80000007 encountered at address
0x000000
* frame #0: 0x0000000180178837 msys-2.0.dll`cygheap_init()
frame #1: 0x0000000180178b89 msys-2.0.dll`setup_cygheap()
frame #2: 0x00000001800488bd msys-2.0.dll`dll_crt0_0()
frame #3: 0x000000018007197c msys-2.0.dll`dll_entry(h=0x0000000180040000,
reason=<unavailable>, static_load=<unavailable>)
frame #4: 0x00007ffece99869f
ntdll.dll`RtlActivateActivationContextUnsafeFast + 303
frame #5: 0x00007ffece9dd03d ntdll.dll`RtlEnumerateEntryHashTable + 957
frame #6: 0x00007ffece9dcdee ntdll.dll`RtlEnumerateEntryHashTable + 366
frame #7: 0x00007ffece9dce60 ntdll.dll`RtlEnumerateEntryHashTable + 480
frame #8: 0x00007ffece9dce60 ntdll.dll`RtlEnumerateEntryHashTable + 480
frame #9: 0x00007ffece9dce60 ntdll.dll`RtlEnumerateEntryHashTable + 480
frame #10: 0x00007ffece9dce60 ntdll.dll`RtlEnumerateEntryHashTable + 480
frame #11: 0x00007ffece99d62d ntdll.dll`RtlCopyUnicodeString + 1293
frame #12: 0x00007ffece998940 ntdll.dll`RtlImageRvaToSection + 592
frame #13: 0x00007ffece988cac ntdll.dll`RtlUnicodeToCustomCPN + 1020
frame #14: 0x00007ffece99a25a ntdll.dll`LdrLoadDll + 250
frame #15: 0x00007ffecbe961e2 KERNELBASE.dll`LoadLibraryExW + 370
frame #16: 0x00007ff6df3414ba ldh.exe
frame #17: 0x00007ff6df3412ee ldh.exe
frame #18: 0x00007ff6df341406 ldh.exe
frame #19: 0x00007ffecdc6257d kernel32.dll`BaseThreadInitThunk + 29
frame #20: 0x00007ffece9caa48 ntdll.dll`RtlUserThreadStart + 40
msys-2.0.dll`cygheap_init:
0x180178750 <+0>: pushq %rbx
0x180178751 <+1>: subq $0x20, %rsp
0x180178755 <+5>: leaq 0x102de4(%rip), %rcx ; _sys_nerr + 148864
0x18017875c <+12>: leaq 0x153b2f(%rip), %rdx ; __infinity + 5074
0x180178763 <+19>: callq 0x1800cce50 ; muto::init at 32:1
0x180178768 <+24>: movq 0x102e01(%rip), %rcx ; _sys_nerr + 148912
0x18017876f <+31>: leaq 0x102e02(%rip), %rax ; _sys_nerr + 148920
0x180178776 <+38>: cmpq %rax, %rcx
0x180178779 <+41>: je 0x1801787d0 ; <+128> at 294:47
0x18017877b <+43>: cmpq $0x0, 0x4870(%rcx)
0x180178783 <+51>: je 0x1801787a0 ; <+80> at 311:3
0x180178785 <+53>: cmpq $0x0, 0x48a0(%rcx)
0x18017878d <+61>: je 0x1801787b5 ; <+101> at 312:14
0x18017878f <+63>: addq $0x20, %rsp
0x180178793 <+67>: popq %rbx
0x180178794 <+68>: jmp 0x180178680 ; init_cygheap::init_tls_list at
638:1
0x180178799 <+73>: nopl (%rax)
0x1801787a0 <+80>: cmpq $0x0, 0x48a0(%rcx)
0x1801787a8 <+88>: movq $0x3, 0x4888(%rcx)
0x1801787b3 <+99>: jne 0x18017878f ; <+63> at 314:1
0x1801787b5 <+101>: callq 0x1800c0c10 ; sigalloc at 125:1
0x1801787ba <+106>: movq 0x102daf(%rip), %rcx ; _sys_nerr + 148912
0x1801787c1 <+113>: addq $0x20, %rsp
0x1801787c5 <+117>: popq %rbx
0x1801787c6 <+118>: jmp 0x180178680 ; init_cygheap::init_tls_list at
638:1
0x1801787cb <+123>: nopl (%rax,%rax)
0x1801787d0 <+128>: movabsq $0x800000000, %rbx ; imm = 0x800000000
0x1801787da <+138>: movl $0x1, %r9d
0x1801787e0 <+144>: movl $0x2000, %r8d ; imm = 0x2000
0x1801787e6 <+150>: movabsq $0x200000000, %rdx ; imm = 0x200000000
0x1801787f0 <+160>: movq %rbx, %rcx
0x1801787f3 <+163>: callq 0x180217090 ; _alloca + 4336
0x1801787f8 <+168>: movq %rbx, %rcx
0x1801787fb <+171>: movl $0x4, %r9d
0x180178801 <+177>: movl $0x1000, %r8d ; imm = 0x1000
0x180178807 <+183>: movl $0x300000, %edx ; imm = 0x300000
0x18017880c <+188>: movq %rax, 0x102d5d(%rip) ; _sys_nerr + 148912
0x180178813 <+195>: callq 0x180217090 ; _alloca + 4336
0x180178818 <+200>: movq %rax, %rcx
0x18017881b <+203>: movq %rax, 0x102d4e(%rip) ; _sys_nerr + 148912
0x180178822 <+210>: leaq 0x48e0(%rax), %rax
0x180178829 <+217>: movq %rax, 0x102d38(%rip) ; _sys_nerr + 148904
0x180178830 <+224>: leaq 0x3d319(%rip), %rax ; __utf8_mbtowc at 534:1
-> 0x180178837 <+231>: movq %rax, (%rcx)
0x18017883a <+234>: movl $0x12, 0x4828(%rcx)
0x180178844 <+244>: movq $0x0, 0x4830(%rcx)
0x18017884f <+255>: jmp 0x18017877b ; <+43> at 309:3
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