gdb ./simple-cancel 
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Reading symbols from ./simple-cancel...done.
(gdb) r
Starting program: /home/fweimer/tmp/simple-cancel 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7ffff77e1700 (LWP 12256)]
handler2 called
handler1 called
[Thread 0x7ffff77e1700 (LWP 12256) exited]
[Inferior 1 (process 12252) exited normally]
Missing separate debuginfos, use: dnf debuginfo-install libgcc-7.2.1-2.fc26.x86_64
(gdb) break sigcancel_handler
Breakpoint 1 at 0x7ffff7bbc960: file nptl-init.c, line 187.
(gdb) r
Starting program: /home/fweimer/tmp/simple-cancel 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7ffff77e1700 (LWP 12258)]
[Switching to Thread 0x7ffff77e1700 (LWP 12258)]

Thread 2 "simple-cancel" hit Breakpoint 1, sigcancel_handler (sig=32, si=0x7ffff77e09b0, ctx=0x7ffff77e0880)
    at nptl-init.c:187
187	  if (sig != SIGCANCEL
(gdb) bt
#0  sigcancel_handler (sig=32, si=0x7ffff77e09b0, ctx=0x7ffff77e0880) at nptl-init.c:187
#1  <signal handler called>
#2  0x00007ffff7bc89ed in pause () at ../sysdeps/unix/syscall-template.S:84
#3  0x000000000040098d in pausefunc () at simple-cancel.c:27
#4  0x00000000004009af in handlerfunc () at simple-cancel.c:35
#5  0x00000000004009ff in threadfunc (closure=<optimized out>) at simple-cancel.c:45
#6  0x00007ffff7bbe36d in start_thread (arg=0x7ffff77e1700) at pthread_create.c:456
#7  0x00007ffff78f2e1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
(gdb) up
#1  <signal handler called>
(gdb) down
#0  sigcancel_handler (sig=32, si=0x7ffff77e09b0, ctx=0x7ffff77e0880) at nptl-init.c:187
187	  if (sig != SIGCANCEL
(gdb) disas
Dump of assembler code for function sigcancel_handler:
=> 0x00007ffff7bbc960 <+0>:	cmp    $0x20,%edi
   0x00007ffff7bbc963 <+3>:	je     0x7ffff7bbc970 <sigcancel_handler+16>
   0x00007ffff7bbc965 <+5>:	repz retq 
   0x00007ffff7bbc967 <+7>:	nopw   0x0(%rax,%rax,1)
   0x00007ffff7bbc970 <+16>:	push   %rbp
   0x00007ffff7bbc971 <+17>:	push   %rbx
   0x00007ffff7bbc972 <+18>:	mov    %rsi,%rbx
   0x00007ffff7bbc975 <+21>:	sub    $0x8,%rsp
   0x00007ffff7bbc979 <+25>:	mov    0x10(%rsi),%ebp
   0x00007ffff7bbc97c <+28>:	callq  0x7ffff7bbc670
   0x00007ffff7bbc981 <+33>:	cmp    %eax,%ebp
   0x00007ffff7bbc983 <+35>:	je     0x7ffff7bbc990 <sigcancel_handler+48>
   0x00007ffff7bbc985 <+37>:	add    $0x8,%rsp
   0x00007ffff7bbc989 <+41>:	pop    %rbx
   0x00007ffff7bbc98a <+42>:	pop    %rbp
   0x00007ffff7bbc98b <+43>:	retq   
   0x00007ffff7bbc98c <+44>:	nopl   0x0(%rax)
   0x00007ffff7bbc990 <+48>:	cmpl   $0xfffffffa,0x8(%rbx)
   0x00007ffff7bbc994 <+52>:	jne    0x7ffff7bbc985 <sigcancel_handler+37>
   0x00007ffff7bbc996 <+54>:	mov    %fs:0x308,%edx
   0x00007ffff7bbc99e <+62>:	jmp    0x7ffff7bbc9b7 <sigcancel_handler+87>
   0x00007ffff7bbc9a0 <+64>:	test   $0x10,%dl
   0x00007ffff7bbc9a3 <+67>:	jne    0x7ffff7bbc985 <sigcancel_handler+37>
   0x00007ffff7bbc9a5 <+69>:	mov    %edx,%eax
   0x00007ffff7bbc9a7 <+71>:	lock cmpxchg %ecx,%fs:0x308
   0x00007ffff7bbc9b1 <+81>:	cmp    %eax,%edx
   0x00007ffff7bbc9b3 <+83>:	je     0x7ffff7bbc9c8 <sigcancel_handler+104>
   0x00007ffff7bbc9b5 <+85>:	mov    %eax,%edx
   0x00007ffff7bbc9b7 <+87>:	mov    %edx,%ecx
   0x00007ffff7bbc9b9 <+89>:	or     $0xc,%ecx
   0x00007ffff7bbc9bc <+92>:	cmp    %ecx,%edx
   0x00007ffff7bbc9be <+94>:	jne    0x7ffff7bbc9a0 <sigcancel_handler+64>
   0x00007ffff7bbc9c0 <+96>:	jmp    0x7ffff7bbc985 <sigcancel_handler+37>
   0x00007ffff7bbc9c2 <+98>:	nopw   0x0(%rax,%rax,1)
   0x00007ffff7bbc9c8 <+104>:	movq   $0xffffffffffffffff,%fs:0x630
   0x00007ffff7bbc9d5 <+117>:	and    $0x2,%edx
   0x00007ffff7bbc9d8 <+120>:	je     0x7ffff7bbc985 <sigcancel_handler+37>
   0x00007ffff7bbc9da <+122>:	lock orl $0x10,%fs:0x308
   0x00007ffff7bbc9e4 <+132>:	mov    %fs:0x300,%rdi
   0x00007ffff7bbc9ed <+141>:	callq  0x7ffff7bc7e60 <__GI___pthread_unwind>
End of assembler dump.
(gdb) break *0x00007ffff7bbc965
Breakpoint 2 at 0x7ffff7bbc965: file nptl-init.c, line 187.
(gdb) break *0x00007ffff7bbc98b
Breakpoint 3 at 0x7ffff7bbc98b: file nptl-init.c, line 223.
(gdb) up
#1  <signal handler called>
(gdb) disas
Dump of assembler code for function __restore_rt:
=> 0x00007ffff7bc93b0 <+0>:	mov    $0xf,%rax
   0x00007ffff7bc93b7 <+7>:	syscall 
   0x00007ffff7bc93b9 <+9>:	nopl   0x0(%rax)
End of assembler dump.
(gdb) up
#2  0x00007ffff7bc89ed in pause () at ../sysdeps/unix/syscall-template.S:84
84	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
(gdb) disas
Dump of assembler code for function pause:
   0x00007ffff7bc89c0 <+0>:	cmpl   $0x0,0x20c7b9(%rip)        # 0x7ffff7dd5180 <__pthread_multiple_threads>
   0x00007ffff7bc89c7 <+7>:	jne    0x7ffff7bc89d9 <pause+25>
   0x00007ffff7bc89c9 <+0>:	mov    $0x22,%eax
   0x00007ffff7bc89ce <+5>:	syscall 
   0x00007ffff7bc89d0 <+7>:	cmp    $0xfffffffffffff001,%rax
   0x00007ffff7bc89d6 <+13>:	jae    0x7ffff7bc8a09 <pause+73>
   0x00007ffff7bc89d8 <+15>:	retq   
   0x00007ffff7bc89d9 <+25>:	sub    $0x8,%rsp
   0x00007ffff7bc89dd <+29>:	callq  0x7ffff7bc7f90 <__pthread_enable_asynccancel>
   0x00007ffff7bc89e2 <+34>:	mov    %rax,(%rsp)
   0x00007ffff7bc89e6 <+38>:	mov    $0x22,%eax
   0x00007ffff7bc89eb <+43>:	syscall 
=> 0x00007ffff7bc89ed <+45>:	mov    (%rsp),%rdi
   0x00007ffff7bc89f1 <+49>:	mov    %rax,%rdx
   0x00007ffff7bc89f4 <+52>:	callq  0x7ffff7bc7ff0 <__pthread_disable_asynccancel>
   0x00007ffff7bc89f9 <+57>:	mov    %rdx,%rax
   0x00007ffff7bc89fc <+60>:	add    $0x8,%rsp
   0x00007ffff7bc8a00 <+64>:	cmp    $0xfffffffffffff001,%rax
   0x00007ffff7bc8a06 <+70>:	jae    0x7ffff7bc8a09 <pause+73>
   0x00007ffff7bc8a08 <+72>:	retq   
   0x00007ffff7bc8a09 <+73>:	mov    0x208370(%rip),%rcx        # 0x7ffff7dd0d80
   0x00007ffff7bc8a10 <+80>:	neg    %eax
   0x00007ffff7bc8a12 <+82>:	mov    %eax,%fs:(%rcx)
   0x00007ffff7bc8a15 <+85>:	or     $0xffffffffffffffff,%rax
   0x00007ffff7bc8a19 <+89>:	retq   
End of assembler dump.
(gdb) break *0x00007ffff7bc89d8
Breakpoint 4 at 0x7ffff7bc89d8: file ../sysdeps/unix/syscall-template.S, line 84.
(gdb) break *0x00007ffff7bc8a08
Breakpoint 5 at 0x7ffff7bc8a08: file ../sysdeps/unix/syscall-template.S, line 85.
(gdb) break *0x00007ffff7bc8a19
Breakpoint 6 at 0x7ffff7bc8a19: file ../sysdeps/unix/syscall-template.S, line 86.
(gdb) up
#3  0x000000000040098d in pausefunc () at simple-cancel.c:27
27	    pause ();
(gdb) disas
Dump of assembler code for function pausefunc:
   0x0000000000400980 <+0>:	sub    $0x8,%rsp
   0x0000000000400984 <+4>:	nopl   0x0(%rax)
   0x0000000000400988 <+8>:	callq  0x400780 <pause@plt>
=> 0x000000000040098d <+13>:	jmp    0x400988 <pausefunc+8>
End of assembler dump.
(gdb) up
#4  0x00000000004009af in handlerfunc () at simple-cancel.c:35
35	  pausefunc ();
(gdb) disas
Dump of assembler code for function handlerfunc:
   0x0000000000400990 <+0>:	sub    $0x78,%rsp
   0x0000000000400994 <+4>:	xor    %esi,%esi
   0x0000000000400996 <+6>:	mov    %rsp,%rdi
   0x0000000000400999 <+9>:	callq  0x4007c0 <__sigsetjmp@plt>
   0x000000000040099e <+14>:	test   %eax,%eax
   0x00000000004009a0 <+16>:	jne    0x4009c8 <handlerfunc+56>
   0x00000000004009a2 <+18>:	mov    %rsp,%rdi
   0x00000000004009a5 <+21>:	callq  0x400750 <__pthread_register_cancel@plt>
   0x00000000004009aa <+26>:	callq  0x400980 <pausefunc>
=> 0x00000000004009af <+31>:	mov    %rsp,%rdi
   0x00000000004009b2 <+34>:	callq  0x400770 <__pthread_unregister_cancel@plt>
   0x00000000004009b7 <+39>:	xor    %edi,%edi
   0x00000000004009b9 <+41>:	callq  0x400970 <handler2>
   0x00000000004009be <+46>:	add    $0x78,%rsp
   0x00000000004009c2 <+50>:	retq   
   0x00000000004009c3 <+51>:	nopl   0x0(%rax,%rax,1)
   0x00000000004009c8 <+56>:	xor    %edi,%edi
   0x00000000004009ca <+58>:	callq  0x400970 <handler2>
   0x00000000004009cf <+63>:	mov    %rsp,%rdi
   0x00000000004009d2 <+66>:	callq  0x4007b0 <__pthread_unwind_next@plt>
End of assembler dump.
(gdb) break *0x00000000004009c2
Breakpoint 7 at 0x4009c2: file simple-cancel.c, line 37.
(gdb) up
#5  0x00000000004009ff in threadfunc (closure=<optimized out>) at simple-cancel.c:45
45	  handlerfunc ();
(gdb) disas
Dump of assembler code for function threadfunc:
   0x00000000004009e0 <+0>:	sub    $0x78,%rsp
   0x00000000004009e4 <+4>:	xor    %esi,%esi
   0x00000000004009e6 <+6>:	mov    %rsp,%rdi
   0x00000000004009e9 <+9>:	callq  0x4007c0 <__sigsetjmp@plt>
   0x00000000004009ee <+14>:	test   %eax,%eax
   0x00000000004009f0 <+16>:	jne    0x400a10 <threadfunc+48>
   0x00000000004009f2 <+18>:	mov    %rsp,%rdi
   0x00000000004009f5 <+21>:	callq  0x400750 <__pthread_register_cancel@plt>
   0x00000000004009fa <+26>:	callq  0x400990 <handlerfunc>
=> 0x00000000004009ff <+31>:	mov    %rsp,%rdi
   0x0000000000400a02 <+34>:	callq  0x400770 <__pthread_unregister_cancel@plt>
   0x0000000000400a07 <+39>:	xor    %eax,%eax
   0x0000000000400a09 <+41>:	add    $0x78,%rsp
   0x0000000000400a0d <+45>:	retq   
   0x0000000000400a0e <+46>:	xchg   %ax,%ax
   0x0000000000400a10 <+48>:	xor    %edi,%edi
   0x0000000000400a12 <+50>:	callq  0x400960 <handler1>
   0x0000000000400a17 <+55>:	mov    %rsp,%rdi
   0x0000000000400a1a <+58>:	callq  0x4007b0 <__pthread_unwind_next@plt>
End of assembler dump.
(gdb) break *0x0000000000400a0d
Breakpoint 8 at 0x400a0d: file simple-cancel.c, line 48.
(gdb) up
#6  0x00007ffff7bbe36d in start_thread (arg=0x7ffff77e1700) at pthread_create.c:456
456	      THREAD_SETMEM (pd, result, CALL_THREAD_FCT (pd));
(gdb) disas
Dump of assembler code for function start_thread:
   0x00007ffff7bbe290 <+0>:	push   %rbx
   0x00007ffff7bbe291 <+1>:	mov    %rdi,%rbx
   0x00007ffff7bbe294 <+4>:	sub    $0xa0,%rsp
   0x00007ffff7bbe29b <+11>:	mov    %rdi,0x8(%rsp)
   0x00007ffff7bbe2a0 <+16>:	mov    %fs:0x28,%rax
   0x00007ffff7bbe2a9 <+25>:	mov    %rax,0x98(%rsp)
   0x00007ffff7bbe2b1 <+33>:	xor    %eax,%eax
   0x00007ffff7bbe2b3 <+35>:	rdtsc  
   0x00007ffff7bbe2b5 <+37>:	shl    $0x20,%rdx
   0x00007ffff7bbe2b9 <+41>:	mov    %eax,%eax
   0x00007ffff7bbe2bb <+43>:	or     %rax,%rdx
   0x00007ffff7bbe2be <+46>:	mov    %rdx,%fs:0x620
   0x00007ffff7bbe2c7 <+55>:	mov    0x212ada(%rip),%rax        # 0x7ffff7dd0da8
   0x00007ffff7bbe2ce <+62>:	lea    0x6b8(%rdi),%rdx
   0x00007ffff7bbe2d5 <+69>:	mov    %rdx,%fs:(%rax)
   0x00007ffff7bbe2d9 <+73>:	callq  0x7ffff7bbc780
   0x00007ffff7bbe2de <+78>:	xor    %eax,%eax
   0x00007ffff7bbe2e0 <+80>:	xchg   %eax,0x61c(%rbx)
   0x00007ffff7bbe2e6 <+86>:	cmp    $0xfffffffe,%eax
   0x00007ffff7bbe2e9 <+89>:	je     0x7ffff7bbe46b <start_thread+475>
   0x00007ffff7bbe2ef <+95>:	mov    0x8(%rsp),%rbx
   0x00007ffff7bbe2f4 <+100>:	mov    $0x18,%esi
   0x00007ffff7bbe2f9 <+105>:	mov    $0x111,%eax
   0x00007ffff7bbe2fe <+110>:	lea    0x2e0(%rbx),%rdi
   0x00007ffff7bbe305 <+117>:	syscall 
   0x00007ffff7bbe307 <+119>:	testb  $0x4,0x614(%rbx)
   0x00007ffff7bbe30e <+126>:	jne    0x7ffff7bbe432 <start_thread+418>
   0x00007ffff7bbe314 <+132>:	lea    0x10(%rsp),%rdi
   0x00007ffff7bbe319 <+137>:	movq   $0x0,0x58(%rsp)
   0x00007ffff7bbe322 <+146>:	movq   $0x0,0x60(%rsp)
   0x00007ffff7bbe32b <+155>:	callq  0x7ffff7bbc6e0
   0x00007ffff7bbe330 <+160>:	test   %eax,%eax
   0x00007ffff7bbe332 <+162>:	mov    %eax,%ebx
   0x00007ffff7bbe334 <+164>:	jne    0x7ffff7bbe376 <start_thread+230>
   0x00007ffff7bbe336 <+166>:	lea    0x10(%rsp),%rax
   0x00007ffff7bbe33b <+171>:	mov    %rax,%fs:0x300
   0x00007ffff7bbe344 <+180>:	mov    0x8(%rsp),%rax
   0x00007ffff7bbe349 <+185>:	cmpb   $0x0,0x613(%rax)
   0x00007ffff7bbe350 <+192>:	jne    0x7ffff7bbe4d4 <start_thread+580>
   0x00007ffff7bbe356 <+198>:	mov    0x8(%rsp),%rax
   0x00007ffff7bbe35b <+203>:	nop
   0x00007ffff7bbe35c <+204>:	mov    %fs:0x648,%rdi
   0x00007ffff7bbe365 <+213>:	callq  *%fs:0x640
=> 0x00007ffff7bbe36d <+221>:	mov    %rax,%fs:0x630
   0x00007ffff7bbe376 <+230>:	callq  0x7ffff7bbc6d0
   0x00007ffff7bbe37b <+235>:	xor    %eax,%eax
   0x00007ffff7bbe37d <+237>:	mov    %fs:0x610,%al
   0x00007ffff7bbe385 <+245>:	test   %al,%al
   0x00007ffff7bbe387 <+247>:	jne    0x7ffff7bbe428 <start_thread+408>
   0x00007ffff7bbe38d <+253>:	callq  0x7ffff7bbc710
   0x00007ffff7bbe392 <+258>:	lock decl 0x212c87(%rip)        # 0x7ffff7dd1020 <__nptl_nthreads>
   0x00007ffff7bbe399 <+265>:	sete   %al
   0x00007ffff7bbe39c <+268>:	test   %al,%al
   0x00007ffff7bbe39e <+270>:	jne    0x7ffff7bbe5cd <start_thread+829>
   0x00007ffff7bbe3a4 <+276>:	mov    0x8(%rsp),%rax
   0x00007ffff7bbe3a9 <+281>:	cmpb   $0x0,0x611(%rax)
   0x00007ffff7bbe3b0 <+288>:	jne    0x7ffff7bbe59f <start_thread+783>
   0x00007ffff7bbe3b6 <+294>:	mov    0x8(%rsp),%rbx
   0x00007ffff7bbe3bb <+299>:	lock orl $0x10,0x308(%rbx)
   0x00007ffff7bbe3c3 <+307>:	callq  0x7ffff7bbc758
   0x00007ffff7bbe3c8 <+312>:	mov    0x690(%rbx),%rdi
   0x00007ffff7bbe3cf <+319>:	neg    %eax
   0x00007ffff7bbe3d1 <+321>:	mov    %rsp,%rdx
   0x00007ffff7bbe3d4 <+324>:	cltq   
   0x00007ffff7bbe3d6 <+326>:	sub    %rdi,%rdx
   0x00007ffff7bbe3d9 <+329>:	and    %rdx,%rax
   0x00007ffff7bbe3dc <+332>:	cmp    %rax,0x698(%rbx)
   0x00007ffff7bbe3e3 <+339>:	jbe    0x7ffff7bbe4b5 <start_thread+549>
   0x00007ffff7bbe3e9 <+345>:	cmp    $0x4000,%rax
   0x00007ffff7bbe3ef <+351>:	ja     0x7ffff7bbe617 <start_thread+903>
   0x00007ffff7bbe3f5 <+357>:	mov    0x8(%rsp),%rax
   0x00007ffff7bbe3fa <+362>:	cmp    %rax,0x628(%rax)
   0x00007ffff7bbe401 <+369>:	je     0x7ffff7bbe608 <start_thread+888>
   0x00007ffff7bbe407 <+375>:	mov    0x8(%rsp),%rax
   0x00007ffff7bbe40c <+380>:	testb  $0x40,0x308(%rax)
   0x00007ffff7bbe413 <+387>:	jne    0x7ffff7bbe53a <start_thread+682>
   0x00007ffff7bbe419 <+393>:	mov    $0x3c,%edx
   0x00007ffff7bbe41e <+398>:	xchg   %ax,%ax
   0x00007ffff7bbe420 <+400>:	xor    %edi,%edi
   0x00007ffff7bbe422 <+402>:	mov    %edx,%eax
   0x00007ffff7bbe424 <+404>:	syscall 
   0x00007ffff7bbe426 <+406>:	jmp    0x7ffff7bbe420 <start_thread+400>
   0x00007ffff7bbe428 <+408>:	callq  0x7ffff7bbd020 <__nptl_deallocate_tsd>
   0x00007ffff7bbe42d <+413>:	jmpq   0x7ffff7bbe38d <start_thread+253>
   0x00007ffff7bbe432 <+418>:	lea    0x18(%rsp),%rdx
   0x00007ffff7bbe437 <+423>:	xor    %eax,%eax
   0x00007ffff7bbe439 <+425>:	mov    $0x1e,%ecx
   0x00007ffff7bbe43e <+430>:	lea    0x10(%rsp),%rsi
   0x00007ffff7bbe443 <+435>:	mov    $0x8,%r10d
   0x00007ffff7bbe449 <+441>:	mov    %rdx,%rdi
   0x00007ffff7bbe44c <+444>:	xor    %edx,%edx
   0x00007ffff7bbe44e <+446>:	rep stos %eax,%es:(%rdi)
   0x00007ffff7bbe450 <+448>:	mov    $0x80000000,%eax
   0x00007ffff7bbe455 <+453>:	mov    $0x1,%edi
   0x00007ffff7bbe45a <+458>:	mov    %rax,0x10(%rsp)
   0x00007ffff7bbe45f <+463>:	mov    $0xe,%eax
   0x00007ffff7bbe464 <+468>:	syscall 
   0x00007ffff7bbe466 <+470>:	jmpq   0x7ffff7bbe314 <start_thread+132>
   0x00007ffff7bbe46b <+475>:	mov    0x8(%rsp),%rax
   0x00007ffff7bbe470 <+480>:	xor    %r10d,%r10d
   0x00007ffff7bbe473 <+483>:	mov    $0x1,%edx
   0x00007ffff7bbe478 <+488>:	mov    $0x81,%esi
   0x00007ffff7bbe47d <+493>:	lea    0x61c(%rax),%rdi
   0x00007ffff7bbe484 <+500>:	mov    $0xca,%eax
   0x00007ffff7bbe489 <+505>:	syscall 
   0x00007ffff7bbe48b <+507>:	cmp    $0xfffffffffffff000,%rax
   0x00007ffff7bbe491 <+513>:	jbe    0x7ffff7bbe2ef <start_thread+95>
   0x00007ffff7bbe497 <+519>:	cmp    $0xffffffea,%eax
   0x00007ffff7bbe49a <+522>:	je     0x7ffff7bbe2ef <start_thread+95>
   0x00007ffff7bbe4a0 <+528>:	cmp    $0xfffffff2,%eax
   0x00007ffff7bbe4a3 <+531>:	je     0x7ffff7bbe2ef <start_thread+95>
   0x00007ffff7bbe4a9 <+537>:	lea    0xc770(%rip),%rdi        # 0x7ffff7bcac20
   0x00007ffff7bbe4b0 <+544>:	callq  0x7ffff7bbc638
   0x00007ffff7bbe4b5 <+549>:	lea    0xc914(%rip),%rcx        # 0x7ffff7bcadd0 <__PRETTY_FUNCTION__.11908>
   0x00007ffff7bbe4bc <+556>:	lea    0xc962(%rip),%rsi        # 0x7ffff7bcae25
   0x00007ffff7bbe4c3 <+563>:	lea    0xc8b6(%rip),%rdi        # 0x7ffff7bcad80
   0x00007ffff7bbe4ca <+570>:	mov    $0x22a,%edx
   0x00007ffff7bbe4cf <+575>:	callq  0x7ffff7bbc6a0
   0x00007ffff7bbe4d4 <+580>:	callq  0x7ffff7bc7f90 <__pthread_enable_asynccancel>
   0x00007ffff7bbe4d9 <+585>:	mov    $0x1,%esi
   0x00007ffff7bbe4de <+590>:	mov    %eax,%edx
   0x00007ffff7bbe4e0 <+592>:	mov    %ebx,%eax
   0x00007ffff7bbe4e2 <+594>:	mov    0x8(%rsp),%rbx
   0x00007ffff7bbe4e7 <+599>:	lock cmpxchg %esi,0x618(%rbx)
   0x00007ffff7bbe4ef <+607>:	je     0x7ffff7bbe50b <start_thread+635>
   0x00007ffff7bbe4f1 <+609>:	lea    0x618(%rbx),%rdi
   0x00007ffff7bbe4f8 <+616>:	sub    $0x80,%rsp
   0x00007ffff7bbe4ff <+623>:	callq  0x7ffff7bc8050 <__lll_lock_wait_private>
   0x00007ffff7bbe504 <+628>:	add    $0x80,%rsp
   0x00007ffff7bbe50b <+635>:	lock decl 0x618(%rbx)
   0x00007ffff7bbe512 <+642>:	je     0x7ffff7bbe52e <start_thread+670>
   0x00007ffff7bbe514 <+644>:	lea    0x618(%rbx),%rdi
   0x00007ffff7bbe51b <+651>:	sub    $0x80,%rsp
   0x00007ffff7bbe522 <+658>:	callq  0x7ffff7bc8100 <__lll_unlock_wake_private>
   0x00007ffff7bbe527 <+663>:	add    $0x80,%rsp
   0x00007ffff7bbe52e <+670>:	mov    %edx,%edi
   0x00007ffff7bbe530 <+672>:	callq  0x7ffff7bc7ff0 <__pthread_disable_asynccancel>
   0x00007ffff7bbe535 <+677>:	jmpq   0x7ffff7bbe356 <start_thread+198>
   0x00007ffff7bbe53a <+682>:	lea    0x61c(%rax),%rbx
   0x00007ffff7bbe541 <+689>:	mov    $0xca,%r9d
   0x00007ffff7bbe547 <+695>:	mov    $0x1,%r8d
   0x00007ffff7bbe54d <+701>:	jmp    0x7ffff7bbe561 <start_thread+721>
   0x00007ffff7bbe54f <+703>:	mov    0x8(%rsp),%rax
   0x00007ffff7bbe554 <+708>:	testb  $0x40,0x308(%rax)
   0x00007ffff7bbe55b <+715>:	je     0x7ffff7bbe62d <start_thread+925>
   0x00007ffff7bbe561 <+721>:	xor    %r10d,%r10d
   0x00007ffff7bbe564 <+724>:	xor    %edx,%edx
   0x00007ffff7bbe566 <+726>:	mov    $0x80,%esi
   0x00007ffff7bbe56b <+731>:	mov    %rbx,%rdi
   0x00007ffff7bbe56e <+734>:	mov    %r9d,%eax
   0x00007ffff7bbe571 <+737>:	syscall 
   0x00007ffff7bbe573 <+739>:	cmp    $0xfffffffffffff000,%rax
   0x00007ffff7bbe579 <+745>:	jbe    0x7ffff7bbe54f <start_thread+703>
   0x00007ffff7bbe57b <+747>:	add    $0xb,%eax
   0x00007ffff7bbe57e <+750>:	cmp    $0xb,%eax
   0x00007ffff7bbe581 <+753>:	ja     0x7ffff7bbe4a9 <start_thread+537>
   0x00007ffff7bbe587 <+759>:	mov    %eax,%ecx
   0x00007ffff7bbe589 <+761>:	mov    %r8,%rsi
   0x00007ffff7bbe58c <+764>:	shl    %cl,%rsi
   0x00007ffff7bbe58f <+767>:	mov    %rsi,%rax
   0x00007ffff7bbe592 <+770>:	test   $0x881,%eax
   0x00007ffff7bbe597 <+775>:	je     0x7ffff7bbe4a9 <start_thread+537>
   0x00007ffff7bbe59d <+781>:	jmp    0x7ffff7bbe54f <start_thread+703>
   0x00007ffff7bbe59f <+783>:	mov    0x8(%rsp),%rcx
   0x00007ffff7bbe5a4 <+788>:	mov    0x216b36(%rip),%eax        # 0x7ffff7dd50e0 <__nptl_threads_events>
   0x00007ffff7bbe5aa <+794>:	or     0x650(%rcx),%eax
   0x00007ffff7bbe5b0 <+800>:	test   $0x1,%ah
   0x00007ffff7bbe5b3 <+803>:	je     0x7ffff7bbe3b6 <start_thread+294>
   0x00007ffff7bbe5b9 <+809>:	cmpq   $0x0,0x668(%rcx)
   0x00007ffff7bbe5c1 <+817>:	je     0x7ffff7bbe5d4 <start_thread+836>
   0x00007ffff7bbe5c3 <+819>:	callq  0x7ffff7bbced0 <__nptl_death_event>
   0x00007ffff7bbe5c8 <+824>:	jmpq   0x7ffff7bbe3b6 <start_thread+294>
   0x00007ffff7bbe5cd <+829>:	xor    %edi,%edi
   0x00007ffff7bbe5cf <+831>:	callq  0x7ffff7bbc810
   0x00007ffff7bbe5d4 <+836>:	mov    %rcx,%rax
   0x00007ffff7bbe5d7 <+839>:	movl   $0x9,0x658(%rcx)
   0x00007ffff7bbe5e1 <+849>:	mov    %rcx,0x660(%rax)
   0x00007ffff7bbe5e8 <+856>:	mov    0x216ae9(%rip),%rax        # 0x7ffff7dd50d8 <__nptl_last_event>
   0x00007ffff7bbe5ef <+863>:	mov    0x8(%rsp),%rsi
   0x00007ffff7bbe5f4 <+868>:	mov    %rax,0x668(%rsi)
   0x00007ffff7bbe5fb <+875>:	lock cmpxchg %rsi,0x216ad4(%rip)        # 0x7ffff7dd50d8 <__nptl_last_event>
   0x00007ffff7bbe604 <+884>:	je     0x7ffff7bbe5c3 <start_thread+819>
   0x00007ffff7bbe606 <+886>:	jmp    0x7ffff7bbe5e8 <start_thread+856>
   0x00007ffff7bbe608 <+888>:	mov    0x8(%rsp),%rdi
   0x00007ffff7bbe60d <+893>:	callq  0x7ffff7bbe0a0 <__free_tcb>
   0x00007ffff7bbe612 <+898>:	jmpq   0x7ffff7bbe419 <start_thread+393>
   0x00007ffff7bbe617 <+903>:	lea    -0x4000(%rax),%rsi
   0x00007ffff7bbe61e <+910>:	mov    $0x4,%edx
   0x00007ffff7bbe623 <+915>:	callq  0x7ffff7bbc7b8
   0x00007ffff7bbe628 <+920>:	jmpq   0x7ffff7bbe3f5 <start_thread+357>
   0x00007ffff7bbe62d <+925>:	movl   $0x0,0x61c(%rax)
   0x00007ffff7bbe637 <+935>:	jmpq   0x7ffff7bbe419 <start_thread+393>
End of assembler dump.
(gdb) up
#7  0x00007ffff78f2e1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
97		call	*%rax
(gdb) disas
Dump of assembler code for function clone:
   0x00007ffff78f2de0 <+0>:	mov    $0xffffffffffffffea,%rax
   0x00007ffff78f2de7 <+7>:	test   %rdi,%rdi
   0x00007ffff78f2dea <+10>:	je     0x7ffff78f2e27 <clone+71>
   0x00007ffff78f2dec <+12>:	test   %rsi,%rsi
   0x00007ffff78f2def <+15>:	je     0x7ffff78f2e27 <clone+71>
   0x00007ffff78f2df1 <+17>:	sub    $0x10,%rsi
   0x00007ffff78f2df5 <+21>:	mov    %rcx,0x8(%rsi)
   0x00007ffff78f2df9 <+25>:	mov    %rdi,(%rsi)
   0x00007ffff78f2dfc <+28>:	mov    %rdx,%rdi
   0x00007ffff78f2dff <+31>:	mov    %r8,%rdx
   0x00007ffff78f2e02 <+34>:	mov    %r9,%r8
   0x00007ffff78f2e05 <+37>:	mov    0x8(%rsp),%r10
   0x00007ffff78f2e0a <+42>:	mov    $0x38,%eax
   0x00007ffff78f2e0f <+47>:	syscall 
   0x00007ffff78f2e11 <+49>:	test   %rax,%rax
   0x00007ffff78f2e14 <+52>:	jl     0x7ffff78f2e27 <clone+71>
   0x00007ffff78f2e16 <+54>:	je     0x7ffff78f2e19 <clone+57>
   0x00007ffff78f2e18 <+56>:	retq   
   0x00007ffff78f2e19 <+57>:	xor    %ebp,%ebp
   0x00007ffff78f2e1b <+59>:	pop    %rax
   0x00007ffff78f2e1c <+60>:	pop    %rdi
   0x00007ffff78f2e1d <+61>:	callq  *%rax
=> 0x00007ffff78f2e1f <+63>:	mov    %rax,%rdi
   0x00007ffff78f2e22 <+66>:	callq  0x7ffff78b6fc0 <__GI__exit>
   0x00007ffff78f2e27 <+71>:	mov    0x2be03a(%rip),%rcx        # 0x7ffff7bb0e68
   0x00007ffff78f2e2e <+78>:	neg    %eax
   0x00007ffff78f2e30 <+80>:	mov    %eax,%fs:(%rcx)
   0x00007ffff78f2e33 <+83>:	or     $0xffffffffffffffff,%rax
   0x00007ffff78f2e37 <+87>:	retq   
End of assembler dump.
(gdb) break *0x00007ffff78f2e37
Breakpoint 9 at 0x7ffff78f2e37: file ../sysdeps/unix/sysv/linux/x86_64/clone.S, line 104.
(gdb) up
Initial frame selected; you cannot go up.
(gdb) c
Continuing.
handler2 called
handler1 called
[Thread 0x7ffff77e1700 (LWP 12258) exited]
[Inferior 1 (process 12257) exited normally]
(gdb)