sctp: failed to load transform for md5: -2
sctp: failed to load transform for md5: -2
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3825 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 kernel/kthread.c:87
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3825 Comm: modprobe Not tainted 4.14.0-rc4-next-20171009+ #33
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x41c kernel/panic.c:181
 __warn+0x1c4/0x1e0 kernel/panic.c:544
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178
 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:261
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:free_kthread_struct+0xa2/0xe0 kernel/kthread.c:87
RSP: 0018:ffff8801db307768 EFLAGS: 00010206
RAX: 0000000080000100 RBX: ffff8801c45ab7c0 RCX: 1ffff1003b660ee1
RDX: ffff880197308300 RSI: 0000000000000000 RDI: ffff8801c45ab948
RBP: ffff8801db307770 R08: ffffffff8593c5c0 R09: 1ffff1003b660ed4
R10: ffff880197308300 R11: 0000000000000001 R12: 1ffff1003b660ef0
R13: 1ffff1003b660ef4 R14: 0000000000000000 R15: ffff8801db3077e0
 free_task+0x134/0x1a0 kernel/fork.c:386
 __put_task_struct+0x229/0x3b0 kernel/fork.c:665
 put_task_struct include/linux/sched/task.h:95 [inline]
 delayed_put_task_struct+0xca/0x3d0 kernel/exit.c:180
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2691 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2945 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2912 [inline]
 rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2929
 __do_softirq+0x29d/0xbb2 kernel/softirq.c:284
 invoke_softirq kernel/softirq.c:364 [inline]
 irq_exit+0x1d3/0x210 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:540 [inline]
 smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1041
 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:770
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline]
RIP: 0010:kfree+0xf7/0x250 mm/slab.c:3822
RSP: 0018:ffff880197317b98 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff11
RAX: 0000000000000007 RBX: ffff8801c510f580 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000282
RBP: ffff880197317bb8 R08: ffffffff8593c5c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000282
R13: ffff8801dac00340 R14: ffffffff81ce31c5 R15: ffff8801c510f500
 free_rb_tree_fname+0x85/0xe0 fs/ext4/dir.c:402
 ext4_htree_free_dir_info fs/ext4/dir.c:424 [inline]
 ext4_release_dir+0x44/0x60 fs/ext4/dir.c:622
 __fput+0x333/0x7f0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:112
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x42f/0x510 arch/x86/entry/common.c:266
 entry_SYSCALL_64_fastpath+0xbc/0xbe
RIP: 0033:0x7f10891ce2b0
RSP: 002b:00007fffe84ac288 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f1089499491 RCX: 00007f10891ce2b0
RDX: 00007f1089484e98 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f108969e2f8 R08: 000055b85490c200 R09: 00007f10892219e0
R10: 00007f10892123e0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffe84ac4b3 R14: 000055b85490c1d0 R15: 000550e54f7edbc0
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled