bug#19303: 25.0.50; infinite loop (stack overflow) in mark_object

[Dmitry Antipov]

On 12/08/2014 04:42 PM, Sam Steingold wrote:

> in a situation very similar to that of bug#19022 & bug#19133, I now get
> this crash (this is git tip from dec 8 morning):
> this seems to indicate an infinite recursion in GC.

> Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
> 0   libsystem_kernel.dylib              0x00007fff9555bc7e __kill + 10
> 1   org.gnu.Emacs                       0x00000001000db933 emacs_abort + 19
> 2   org.gnu.Emacs                       0x0000000100141c30 Fsignal + 1344
> 3   org.gnu.Emacs                       0x0000000100141cd9 xsignal + 9
> 4   org.gnu.Emacs                       0x000000010013fc6c xsignal1 + 28
> 5   org.gnu.Emacs                       0x000000010010731d compile_pattern + 733
> 6   org.gnu.Emacs                       0x0000000100107999 fast_string_match + 
> 41
> 7   org.gnu.Emacs                       0x00000001000f3acd 
> Ffind_file_name_handler + 221
> 8   org.gnu.Emacs                       0x00000001000f4389 Fexpand_file_name + 
> 89
> 9   org.gnu.Emacs                       0x00000001000fb7ae Fdo_auto_save + 286
> 10  org.gnu.Emacs                       0x00000001000bdabf shut_down_emacs + 239
> 11  org.gnu.Emacs                       0x00000001000bd8b9 
> terminate_due_to_signal + 89
> 12  org.gnu.Emacs                       0x00000001000dd3e6 
> deliver_fatal_thread_signal + 134
> 13  org.gnu.Emacs                       0x00000001000de166 handle_sigsegv + 150
> 14  libsystem_platform.dylib            0x00007fff9789cf1a _sigtramp + 26
> 15  ???                                 000000000000000000 0 + 0
> 16  org.gnu.Emacs                       0x0000000100124b19 mark_object + 1033
> 17  org.gnu.Emacs                       0x0000000100124b19 mark_object + 1033
> 18  org.gnu.Emacs                       0x0000000100124b19 mark_object + 1033
> 19  org.gnu.Emacs                       0x0000000100124b19 mark_object + 1033
> 20  org.gnu.Emacs                       0x0000000100124b19 mark_object + 1033

Could you please disassemble mark_object? I think we can have nasty issue
somewhat similar to http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16986#32.

Dmitry