git: 89eddfb4b9f5 - main - linux: fix panic on kldunload

The branch main has been updated by glebius:

URL: https://cgit.FreeBSD.org/src/commit/?id=89eddfb4b9f5d744623ce0ee8ea966b0d33456e5

commit 89eddfb4b9f5d744623ce0ee8ea966b0d33456e5
Author:     Gleb Smirnoff <glebius@FreeBSD.org>
AuthorDate: 2025-12-10 19:20:14 +0000
Commit:     Gleb Smirnoff <glebius@FreeBSD.org>
CommitDate: 2025-12-10 19:20:14 +0000

    linux: fix panic on kldunload
    
    The vnet_deregister_sysuninit() that is called by linker unload sequence also
    calls every registered destructor before unregistering it.  IMHO, this is
    not correct in principle, but for now plug the regression right in the code
    that introduced the panic.
    
    Fixes:  607f11055d2d421770963162a4d9a99cdd136152
---
 sys/compat/linux/linux_if.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sys/compat/linux/linux_if.c b/sys/compat/linux/linux_if.c
index 1281207c1c84..b342b07a6722 100644
--- a/sys/compat/linux/linux_if.c
+++ b/sys/compat/linux/linux_if.c
@@ -105,6 +105,13 @@ VNET_SYSINIT(linux_ifnet_vnet_init, SI_SUB_PROTO_IF, SI_ORDER_ANY,
 static void
 linux_ifnet_vnet_uninit(void *arg __unused)
 {
+	/*
+	 * At a normal vnet shutdown all interfaces are gone at this point.
+	 * But when we kldunload linux.ko, the vnet_deregister_sysuninit()
+	 * would call this function for the default vnet.
+	 */
+	if (IS_DEFAULT_VNET(curvnet))
+		clear_unrhdr(V_linux_eth_unr);
 	delete_unrhdr(V_linux_eth_unr);
 }
 VNET_SYSUNINIT(linux_ifnet_vnet_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY,