[Bug 271983] mi_switch hang in KVM on Sapphire Rapids running NET_EPOCH_DRAIN_CALLBACKS

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 13 Jun 2023 16:45:54 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271983

            Bug ID: 271983
           Summary: mi_switch hang in KVM on Sapphire Rapids running
                    NET_EPOCH_DRAIN_CALLBACKS
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: rcm@rcm.sh

I am seeing a strange issue running CURRENT on KVM on Sapphire Rapids.

If I create an interface like `ifconfig wg create` and then destroy the
interface via `ifconfig wg0 destroy`, the process hangs deep within the kernel.


load: 1.55  cmd: ifconfig 2277 [runnable] 31.14r 0.00u 0.00s 0% 3276k
mi_switch+0x175 sched_bind+0xbc epoch_drain_callbacks+0x179
wg_clone_destroy+0x25c if_clone_destroyif_flags+0x69 if_clone_destroy+0xff
ifioctl+0x8d3 kern_ioctl+0x1fe sys_ioctl+0x154 amd64_syscall+0x140
fast_syscall_common+0xf8

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