======================================
| [ 6648.489963][T26110] 1 lock held by sctp_hello/26110:
| [6648.490142][T26110] #0: ffff88800ca73b98 (sk_lock-AF_INET6){+.+.}-{0:0}, at: sctp_bind (./arch/x86/include/asm/jump_label.h:27 net/sctp/socket.c:315) sctp
| [ 6648.490541][T26110]
| [ 6648.490541][T26110] stack backtrace:
[ 6648.491385][T26110] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 6648.491917][T26110] Call Trace:
[ 6648.492051][T26110]  <TASK>
[6648.492149][T26110] dump_stack_lvl (lib/dump_stack.c:123) 
[6648.492342][T26110] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[6648.492517][T26110] dev_get_by_index_rcu (net/core/dev.c:876 (discriminator 7)) 
[6648.492692][T26110] sctp_v6_available (net/sctp/ipv6.c:701) sctp
[6648.492901][T26110] sctp_do_bind (net/sctp/socket.c:400) sctp
[6648.493106][T26110] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[6648.493325][T26110] sctp_bind (net/sctp/socket.c:320) sctp
[6648.493621][T26110] inet6_bind_sk (net/ipv6/af_inet6.c:451) 
[6648.493794][T26110] ? __pfx_inet6_bind_sk (net/ipv6/af_inet6.c:442) 
[6648.493961][T26110] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[6648.494139][T26110] __sys_bind (net/socket.c:1845 net/socket.c:1869) 
[6648.494269][T26110] ? __pfx___sys_bind (net/socket.c:1860) 
[6648.494547][T26110] ? __up_read (./arch/x86/include/asm/atomic64_64.h:79 ./include/linux/atomic/atomic-arch-fallback.h:2749 ./include/linux/atomic/atomic-long.h:184 ./include/linux/atomic/atomic-instrumented.h:3317 kernel/locking/rwsem.c:1345) 
[6648.494726][T26110] ? do_user_addr_fault (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/linux/mm.h:729 arch/x86/mm/fault.c:1340) 
[6648.494896][T26110] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:729 arch/x86/mm/fault.c:1340) 
[6648.495068][T26110] __x64_sys_bind (net/socket.c:1875) 
[6648.495239][T26110] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[6648.495410][T26110] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 6648.495616][T26110] RIP: 0033:0x7f0458628b2b
[ 6648.495788][T26110] Code: 73 01 c3 48 8b 0d d5 92 1b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 31 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a5 92 1b 00 f7 d8 64 89 01 48
All code
========
   0:	73 01                	jae    0x3
   2:	c3                   	ret
   3:	48 8b 0d d5 92 1b 00 	mov    0x1b92d5(%rip),%rcx        # 0x1b92df
   a:	f7 d8                	neg    %eax
   c:	64 89 01             	mov    %eax,%fs:(%rcx)
   f:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  13:	c3                   	ret
  14:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  1b:	00 00 00 
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 31 00 00 00       	mov    $0x31,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 8b 0d a5 92 1b 00 	mov    0x1b92a5(%rip),%rcx        # 0x1b92df
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	ret
   9:	48 8b 0d a5 92 1b 00 	mov    0x1b92a5(%rip),%rcx        # 0x1b92b5
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[ 6648.496361][T26110] RSP: 002b:00007ffdb2190e78 EFLAGS: 00000206 ORIG_RAX: 0000000000000031
[ 6648.496619][T26110] RAX: ffffffffffffffda RBX: 00007ffdb2191068 RCX: 00007f0458628b2b
[ 6648.496865][T26110] RDX: 000000000000001c RSI: 00007ffdb2190eb0 RDI: 0000000000000005
[ 6648.497114][T26110] RBP: 0000000000000005 R08: 1999999999999999 R09: 0000000000000000
[ 6648.497480][T26110] R10: 00007f04585f9d90 R11: 0000000000000206 R12: 00007ffdb21919da


Finger prints:
lockdep_rcu_suspicious:dev_get_by_index_rcu:sctp_v6_available:sctp_do_bind:sctp_bind