Re: Random crash when sending USR2 + QUIT signals to Unicorn process

[Xuanzhong Wei <azrlew@gmail.com>]

Thanks for quick response!

Here is the compiler version:
gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC)

Furthermore, although I was not able to re-produce the issue with codes caused
the problem, I generated some core files of normal and abnormal masters and
workers.

Here is a glimpse of `ruby_current_vm.objspace.global_list`
compared with normal and abnormal masters with same codes.

// normal
(gdb)
$72 = (struct gc_list *) 0x7feb65625680
$73 = 5
---------------------------------------------
(gdb)
$74 = (struct gc_list *) 0x7feb6424e2a0
$75 = 7 # T_ARRAY
---------------------------------------------
(gdb)
$76 = (struct gc_list *) 0x7feb63a8c120
$77 = 8


// abnormal
(gdb)
$72 = (struct gc_list *) 0x7f7547651cc0
$73 = 5
---------------------------------------------
(gdb)
$74 = (struct gc_list *) 0x7f7546939760
$75 = 27 # T_NODE
---------------------------------------------
(gdb)
$76 = (struct gc_list *) 0x7f7546583e70
$77 = 8

Note that I have checked the whole global_list, the order looks the same.
Hence, I am quite sure that the T_NODE in the abnormal one comes from the same
module as the T_ARRAY in the normal one.
And from contents in T_ARRAY, the module should be unicorn_http.