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Date: Fri, 24 May 2024 16:29:14 -0700 (PDT)
To: Takashi Yano <takashi.yano@nifty.ne.jp>
cc: cygwin@cygwin.com
Subject: Re: frequent hangs running ldd
In-Reply-To: <74e13efb-885a-3a90-f530-a6aa14bc5953@jdrake.com>
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From: Jeremy Drake via Cygwin <cygwin@cygwin.com>
Reply-To: Jeremy Drake <cygwin@jdrake.com>
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On Fri, 24 May 2024, Jeremy Drake wrote:

> 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()

It appears that cygheap is NULL, so I'm guessing that VirtualAlloc failed.
!gle in windbg shows
0:000> !gle
LastErrorValue: (Win32) 0x1e7 (487) - Attempt to access invalid address.
LastStatusValue: (NTSTATUS) 0xc0000018 - {Conflicting Address Range}  The
specified address range conflicts with the address space.

Looking at !address, it seems Windows put the PEB, TEBs, and stacks in the
area where the cygheap should be.  Way to go, ASLR :P
        BaseAddress      EndAddress+1        RegionSize     Type       State                 Protect             Usage
--------------------------------------------------------------------------------------------------------------------------
+        5`e8181000        8`05a00000        2`1d87f000             MEM_FREE    PAGE_NOACCESS                      Free
+        8`05a00000        8`05b57000        0`00157000 MEM_PRIVATE MEM_RESERVE                                    <unknown>
         8`05b57000        8`05b58000        0`00001000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE                     PEB        [4628]
         8`05b58000        8`05b5a000        0`00002000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE                     TEB        [~0; 4628.31ac]
         8`05b5a000        8`05b5c000        0`00002000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE                     TEB        [~1; 4628.4aac]
         8`05b5c000        8`05b5e000        0`00002000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE                     TEB        [~2; 4628.5840]
         8`05b5e000        8`05b60000        0`00002000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE                     TEB        [~3; 4628.6b9c]
         8`05b60000        8`05c00000        0`000a0000 MEM_PRIVATE MEM_RESERVE                                    <unknown>
+        8`05c00000        8`05df6000        0`001f6000 MEM_PRIVATE MEM_RESERVE                                    Stack      [~0; 4628.31ac]
         8`05df6000        8`05df9000        0`00003000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE | PAGE_GUARD        Stack      [~0; 4628.31ac]
         8`05df9000        8`05e00000        0`00007000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE                     Stack      [~0; 4628.31ac]
+        8`05e00000        8`05ffb000        0`001fb000 MEM_PRIVATE MEM_RESERVE                                    Stack      [~1; 4628.4aac]
         8`05ffb000        8`05ffe000        0`00003000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE | PAGE_GUARD        Stack      [~1; 4628.4aac]
         8`05ffe000        8`06000000        0`00002000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE                     Stack      [~1; 4628.4aac]
+        8`06000000        8`061fb000        0`001fb000 MEM_PRIVATE MEM_RESERVE                                    Stack      [~2; 4628.5840]
         8`061fb000        8`061fe000        0`00003000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE | PAGE_GUARD        Stack      [~2; 4628.5840]
         8`061fe000        8`06200000        0`00002000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE                     Stack      [~2; 4628.5840]
+        8`06200000        8`063fb000        0`001fb000 MEM_PRIVATE MEM_RESERVE                                    Stack      [~3; 4628.6b9c]
         8`063fb000        8`063fe000        0`00003000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE | PAGE_GUARD        Stack      [~3; 4628.6b9c]
         8`063fe000        8`06400000        0`00002000 MEM_PRIVATE MEM_COMMIT  PAGE_READWRITE                     Stack      [~3; 4628.6b9c]
+        8`06400000      19e`64400000      196`5e000000             MEM_FREE    PAGE_NOACCESS                      Free

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