GNU gdb (Ubuntu 7.7-0ubuntu3) 7.7
Copyright (C) 2014 Free Software Foundation, Inc.
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Reading symbols from emacs...Reading symbols from /usr/lib/debug/.build-id/03/327e010f548b8c61532289d810e812ceae5172.debug...done.
done.
(gdb) info inferiors
  Num  Description       Executable        
* 1    <null>            /usr/bin/emacs    
(gdb) add-invferior -excec emec emacsclient
Added inferior 2
Reading symbols from emacsclient...(no debugging symbols found)...done.
(gdb) handle SIG33 pass nostop noprint
Signal        Stop	Print	Pass to program	Description
SIG33         No	No	Yes		Real-time event 33
(gdb) set pagination 0
(gdb) inferior  info inferiors
  Num  Description       Executable        
  2    <null>            /usr/bin/emacsclient 
* 1    <null>            /usr/bin/emacs    
(gdb) infeiorior 2
[Switching to inferior 2 [<null>] (/usr/bin/emacsclient)]
(gdb) run try.txt
Starting program: /usr/bin/emacsclient try.txt
Waiting for Emacs...
Program received signal SIGINT, Interrupt.
0x00007ffff7b1003d in __libc_recv (fd=3, buf=0x7fffffffbaf0, n=8192, flags=-1) at ../sysdeps/unix/sysv/linux/x86_64/recv.c:29
29	../sysdeps/unix/sysv/linux/x86_64/recv.c: No such file or directory.
(gdb) backtrace full
#0  0x00007ffff7b1003d in __libc_recv (fd=3, buf=0x7fffffffbaf0, n=8192, flags=-1) at ../sysdeps/unix/sysv/linux/x86_64/recv.c:29
        resultvar = 18446744073709551104
        oldtype = -17663
#1  0x0000000000401caa in ?? ()
No symbol table info available.
#2  0x00007ffff7a35ec5 in __libc_start_main (main=0x401690, argc=2, argv=0x7fffffffdc18, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdc08) at libc-start.c:285
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 1256261073157481417, 4203315, 140737488346128, 0, 0, -1256261072236321847, -1256278290590997559}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x403200, 0x7fffffffdc18}, data = {prev = 0x0, cleanup = 0x0, canceltype = 4207104}}}
        not_first_call = <optimized out>
#3  0x000000000040235c in ?? ()
No symbol table info available.
(gdb) info registers
rax            0xfffffffffffffe00	-512
rbx            0x7fffffffbb01	140737488337665
rcx            0xffffffffffffffff	-1
rdx            0x2000	8192
rsi            0x7fffffffbaf0	140737488337648
rdi            0x3	3
rbp            0x7fffffffbb01	0x7fffffffbb01
rsp            0x7fffffffba98	0x7fffffffba98
r8             0x0	0
r9             0x0	0
r10            0x0	0
r11            0x246	582
r12            0x7ffff7fbf6a0	140737353873056
r13            0x11	17
r14            0x2	2
r15            0x7fffffffdc18	140737488346136
rip            0x7ffff7b1003d	0x7ffff7b1003d <__libc_recv+29>
eflags         0x246	[ PF ZF IF ]
cs             0x33	51
ss             0x2b	43
ds             0x0	0
es             0x0	0
fs             0x0	0
gs             0x0	0
(gdb) x/16i $pc
=> 0x7ffff7b1003d <__libc_recv+29>:	cmp    $0xfffffffffffff000,%rax
   0x7ffff7b10043 <__libc_recv+35>:	ja     0x7ffff7b10046 <__libc_recv+38>
   0x7ffff7b10045 <__libc_recv+37>:	retq   
   0x7ffff7b10046 <__libc_recv+38>:	mov    0x2c2e1b(%rip),%rdx        # 0x7ffff7dd2e68
   0x7ffff7b1004d <__libc_recv+45>:	neg    %eax
   0x7ffff7b1004f <__libc_recv+47>:	mov    %eax,%fs:(%rdx)
   0x7ffff7b10052 <__libc_recv+50>:	or     $0xffffffffffffffff,%rax
   0x7ffff7b10056 <__libc_recv+54>:	retq   
   0x7ffff7b10057 <__libc_recv+55>:	push   %rbp
   0x7ffff7b10058 <__libc_recv+56>:	push   %rbx
   0x7ffff7b10059 <__libc_recv+57>:	mov    $0x2d,%ebx
   0x7ffff7b1005e <__libc_recv+62>:	sub    $0x28,%rsp
   0x7ffff7b10062 <__libc_recv+66>:	mov    %ecx,0x1c(%rsp)
   0x7ffff7b10066 <__libc_recv+70>:	mov    %rdx,0x10(%rsp)
   0x7ffff7b1006b <__libc_recv+75>:	mov    %rsi,0x8(%rsp)
   0x7ffff7b10070 <__libc_recv+80>:	mov    %edi,0x18(%rsp)
(gdb) thread apply all backtrace

Thread 1 (process 5977):
#0  0x00007ffff7b1003d in __libc_recv (fd=3, buf=0x7fffffffbaf0, n=8192, flags=-1) at ../sysdeps/unix/sysv/linux/x86_64/recv.c:29
#1  0x0000000000401caa in ?? ()
#2  0x00007ffff7a35ec5 in __libc_start_main (main=0x401690, argc=2, argv=0x7fffffffdc18, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdc08) at libc-start.c:285
#3  0x000000000040235c in ?? ()
(gdb) quit
A debugging session is active.

	Inferior 2 [process 5977] will be killed.

Quit anyway? (y or n)