[GHC] #14669: 32-bit binaries sometimes throw a stack overflow on shutdown.

[GHC]

#14669: 32-bit binaries sometimes throw a stack overflow on shutdown.
-----------------------------------+----------------------------------
        Reporter:  sergv           |                Owner:  (none)
            Type:  bug             |               Status:  infoneeded
        Priority:  normal          |            Milestone:
       Component:  Runtime System  |              Version:  8.2.1
      Resolution:                  |             Keywords:
Operating System:  Windows         |         Architecture:  x86
 Type of failure:  Runtime crash   |            Test Case:
      Blocked By:                  |             Blocking:
 Related Tickets:                  |  Differential Rev(s):
       Wiki Page:                  |
-----------------------------------+----------------------------------

Comment (by sergv):

 Unfortunately, there's no informative backtrace to speak of:
 {{{
 sergey at box /c/home/ghc/bugs/rts-investigations$ gdb --quiet -ex run --args
 ./HW.exe
 Reading symbols from ./HW.exe...done.
 Starting program: C:\home\ghc\bugs\rts-investigations\HW.exe
 [New Thread 2916.0x360]
 warning: `C:\Windows\SYSTEM32\ntdll.dll': Shared library architecture
 i386:x86-64 is not compatible with target architecture i386.
 warning: `C:\Windows\SYSTEM32\wow64.dll': Shared library architecture
 i386:x86-64 is not compatible with target architecture i386.
 warning: `C:\Windows\SYSTEM32\wow64win.dll': Shared library architecture
 i386:x86-64 is not compatible with target architecture i386.
 warning: `C:\Windows\SYSTEM32\wow64cpu.dll': Shared library architecture
 i386:x86-64 is not compatible with target architecture i386.
 warning: Could not load shared library symbols for WOW64_IMAGE_SECTION.
 Do you need "set solib-search-path" or "set sysroot"?
 warning: Could not load shared library symbols for WOW64_IMAGE_SECTION.
 Do you need "set solib-search-path" or "set sysroot"?
 warning: Could not load shared library symbols for NOT_AN_IMAGE.
 Do you need "set solib-search-path" or "set sysroot"?
 warning: Could not load shared library symbols for NOT_AN_IMAGE.
 Do you need "set solib-search-path" or "set sysroot"?
 [New Thread 2916.0x100]
 [New Thread 2916.0xe44]
 [New Thread 2916.0xdb0]
 Situation normal

 Thread 1 received signal SIGSEGV, Segmentation fault.
 0x0000002b in ?? ()
 (gdb) where
 #0  0x0000002b in ?? ()
 #1  0x00788140 in n_capabilities ()
 #2  0x01bde848 in ?? ()
 #3  0x00000000 in ?? ()
 (gdb)
 }}}

 However, I did narrow down the problem. Compiling `rts/StgCRun.c` with
 `-O0` fixes the issue, while compiling it with `-O1` reproduces the crash.
 Is there anything I can do to `StgCRun.c` to make locating the crash
 easier?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14669#comment:15>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler