======================================
| [  794.979252][T21419] eth0: left promiscuous mode
| [  795.061581][T21424] eth1: left promiscuous mode
| [  795.333451][T21363] BUG: using __this_cpu_write() in preemptible [00000000] code: iperf3/21363
| [  795.333965][T21363] caller is tcp_v6_do_rcv (net/ipv6/tcp_ipv6.c:1644)
[  795.334222][T21363] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  795.334225][T21363] Call Trace:
[  795.334228][T21363]  <TASK>
[  795.334231][T21363]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  795.334240][T21363]  check_preemption_disabled (lib/smp_processor_id.c:47)
[  795.334246][T21363]  tcp_v6_do_rcv (net/ipv6/tcp_ipv6.c:1644)
[  795.334252][T21363]  __release_sock (./include/net/sock.h:1190 net/core/sock.c:3216)
[  795.334262][T21363]  __tcp_close (net/ipv4/tcp.c:3238)
[  795.334266][T21363]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[  795.334275][T21363]  tcp_close (net/ipv4/tcp.c:3316)
[  795.334278][T21363]  inet_release (net/ipv4/af_inet.c:442)
[  795.334281][T21363]  ? fcntl_setlk (fs/locks.c:2486)
[  795.334287][T21363]  __sock_release (net/socket.c:722)
[  795.334293][T21363]  sock_close (net/socket.c:1514 (discriminator 1))
[  795.334295][T21363]  __fput (fs/file_table.c:510)
[  795.334300][T21363]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  795.334305][T21363]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  795.334310][T21363]  ? do_raw_spin_unlock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:32 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141)
[  795.334314][T21363]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:187 kernel/locking/spinlock.c:206)
[  795.334317][T21363]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[  795.334320][T21363]  task_work_run (kernel/task_work.c:233)
[  795.334325][T21363]  ? task_work_cancel (kernel/task_work.c:190)
[  795.334334][T21363]  get_signal (kernel/signal.c:2809)
[  795.334342][T21363]  ? preempt_count_add (./include/linux/ftrace.h:1168 kernel/sched/core.c:5837 kernel/sched/core.c:5834 kernel/sched/core.c:5862)
[  795.334345][T21363]  ? kick_process (./include/linux/preempt.h:468 kernel/sched/core.c:3475)
[  795.334347][T21363]  ? kick_process (./include/linux/preempt.h:468 (discriminator 2) kernel/sched/core.c:3475 (discriminator 2))
[  795.334350][T21363]  ? task_work_add (./include/linux/resume_user_mode.h:24 kernel/task_work.c:84)
[  795.334353][T21363]  ? generic_write_checks_count (fs/read_write.c:1754)
[  795.334356][T21363]  ? ptrace_signal (./include/linux/signal.h:87)
[  795.334361][T21363]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  795.334367][T21363]  arch_do_signal_or_restart (arch/x86/kernel/signal.c:337)
[  795.334375][T21363]  ? get_sigframe_size (arch/x86/kernel/signal.c:233)
[  795.334383][T21363]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  795.334387][T21363]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  795.334391][T21363]  exit_to_user_mode_loop (kernel/entry/common.c:64 kernel/entry/common.c:98)
[  795.334395][T21363]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  795.334400][T21363]  do_syscall_64 (./include/linux/irq-entry-common.h:207 ./include/linux/irq-entry-common.h:238 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
[  795.334404][T21363]  ? irq_exit_rcu (kernel/softirq.c:754)
[  795.334409][T21363]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  795.334413][T21363] RIP: 0033:0x7f3c3afa9e32
[  795.334418][T21363] Code: 08 0f 85 91 41 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 55 bf 01 00
All code
========
   0:	08 0f                	or     %cl,(%rdi)
   2:	85 91 41 ff ff 49    	test   %edx,0x49ffff41(%rcx)
   8:	89 fb                	mov    %edi,%ebx
   a:	48 89 f0             	mov    %rsi,%rax
   d:	48 89 d7             	mov    %rdx,%rdi
  10:	48 89 ce             	mov    %rcx,%rsi
  13:	4c 89 c2             	mov    %r8,%rdx
  16:	4d 89 ca             	mov    %r9,%r10
  19:	4c 8b 44 24 08       	mov    0x8(%rsp),%r8
  1e:	4c 8b 4c 24 10       	mov    0x10(%rsp),%r9
  23:	4c 89 5c 24 08       	mov    %r11,0x8(%rsp)
  28:	0f 05                	syscall
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  32:	00 00 00 
  35:	0f 1f 00             	nopl   (%rax)
  38:	f3 0f 1e fa          	endbr64
  3c:	55                   	push   %rbp
  3d:	bf                   	.byte 0xbf
  3e:	01 00                	add    %eax,(%rax)

Code starting with the faulting instruction
===========================================
   0:	c3                   	ret
   1:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   8:	00 00 00 
   b:	0f 1f 00             	nopl   (%rax)
   e:	f3 0f 1e fa          	endbr64
  12:	55                   	push   %rbp
  13:	bf                   	.byte 0xbf
  14:	01 00                	add    %eax,(%rax)
[  795.334420][T21363] RSP: 002b:00007f3c3a760c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[  795.334425][T21363] RAX: fffffffffffffe00 RBX: 0000000000000400 RCX: 00007f3c3afa9e32
[  795.334427][T21363] RDX: 0000000000000400 RSI: 00007f3c3a781000 RDI: 0000000000000008
[  795.334428][T21363] RBP: 00007f3c3a760cc0 R08: 0000000000000000 R09: 0000000000000000
[  795.334430][T21363] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000400


Finger prints:
check_preemption_disabled:tcp_v6_do_rcv:__release_sock:__tcp_close:tcp_close