There is a deadlock when destroying VLANs after the epoch changes were made.
Thread 1:
epoch_block_handler_preempt() at epoch_block_handler_preempt+0x90/frame 0xfffffe00261b3970 ck_epoch_synchronize_wait() at ck_epoch_synchronize_wait+0x9d/frame 0xfffffe00261b39c0 epoch_wait_preempt() at epoch_wait_preempt+0x170/frame 0xfffffe00261b3a20 vlan_setmulti() at vlan_setmulti+0xb4/frame 0xfffffe00261b3a70 vlan_ioctl() at vlan_ioctl+0x83/frame 0xfffffe00261b3ad0 in6m_release_task() at in6m_release_task+0x32e/frame 0xfffffe00261b3b30 gtaskqueue_run_locked() at gtaskqueue_run_locked+0xf9/frame 0xfffffe00261b3b80 gtaskqueue_thread_loop() at gtaskqueue_thread_loop+0x88/frame 0xfffffe00261b3bb0 fork_exit() at fork_exit+0x84/frame 0xfffffe00261b3bf0 fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00261b3bf0 --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
Thread 2:
sleepq_switch() at sleepq_switch+0x10d/frame 0xfffffe002bffd3f0 sleepq_wait() at sleepq_wait+0x43/frame 0xfffffe002bffd420 _sx_xlock_hard() at _sx_xlock_hard+0x4a6/frame 0xfffffe002bffd4c0 _sx_xlock() at _sx_xlock+0xc1/frame 0xfffffe002bffd500 in6_leavegroup() at in6_leavegroup+0x27/frame 0xfffffe002bffd520 in6_purgeaddr() at in6_purgeaddr+0xc2/frame 0xfffffe002bffd6a0 if_purgeaddrs() at if_purgeaddrs+0x11e/frame 0xfffffe002bffd750 if_detach_internal() at if_detach_internal+0x709/frame 0xfffffe002bffd7d0 if_detach() at if_detach+0x3d/frame 0xfffffe002bffd7f0 vlan_clone_destroy() at vlan_clone_destroy+0x21/frame 0xfffffe002bffd820 if_clone_destroyif() at if_clone_destroyif+0x175/frame 0xfffffe002bffd870 if_clone_destroy() at if_clone_destroy+0x205/frame 0xfffffe002bffd8c0 ifioctl() at ifioctl+0x582/frame 0xfffffe002bffd990 kern_ioctl() at kern_ioctl+0x2ba/frame 0xfffffe002bffd9f0 sys_ioctl() at sys_ioctl+0x15e/frame 0xfffffe002bffdac0 amd64_syscall() at amd64_syscall+0x28c/frame 0xfffffe002bffdbf0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe002bffdbf0 --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x80047b92a, rsp = 0x7fffffffe318, rbp = 0x7fffffffe330 ---