if_bridge(4): Fix module teardown
bridge_rtnode_zone still has outstanding allocations at the time of destruction in the current model because all of the interface teardown happens in a VNET_SYSUNINIT, -after- the MOD_UNLOAD has already been processed. The SYSUNINIT triggers destruction of the interfaces, which then attempts to free the memory from the zone that's already been destroyed, and we hit a panic. Solve this by virtualizing the uma_zone we allocate the rtnodes from to fix the ordering. bridge_rtable_fini should also take care to flush any remaining routes that weren't taken care of when dynamic routes were flushed in bridge_stop. Reviewed by: kp Differential Revision: https://reviews.freebsd.org/D19578
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parent
0204d1c793
commit
a87407ff85
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=345180
@ -235,7 +235,8 @@ static eventhandler_tag bridge_detach_cookie;
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int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
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uma_zone_t bridge_rtnode_zone;
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VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone);
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#define V_bridge_rtnode_zone VNET(bridge_rtnode_zone)
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static int bridge_clone_create(struct if_clone *, int, caddr_t);
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static void bridge_clone_destroy(struct ifnet *);
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@ -527,6 +528,9 @@ static void
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vnet_bridge_init(const void *unused __unused)
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{
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V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
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sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
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UMA_ALIGN_PTR, 0);
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BRIDGE_LIST_LOCK_INIT();
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LIST_INIT(&V_bridge_list);
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V_bridge_cloner = if_clone_simple(bridge_name,
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@ -542,6 +546,7 @@ vnet_bridge_uninit(const void *unused __unused)
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if_clone_detach(V_bridge_cloner);
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V_bridge_cloner = NULL;
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BRIDGE_LIST_LOCK_DESTROY();
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uma_zdestroy(V_bridge_rtnode_zone);
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}
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VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
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vnet_bridge_uninit, NULL);
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@ -552,9 +557,6 @@ bridge_modevent(module_t mod, int type, void *data)
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switch (type) {
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case MOD_LOAD:
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bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
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sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
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UMA_ALIGN_PTR, 0);
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bridge_dn_p = bridge_dummynet;
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bridge_detach_cookie = EVENTHANDLER_REGISTER(
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ifnet_departure_event, bridge_ifdetach, NULL,
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@ -563,7 +565,6 @@ bridge_modevent(module_t mod, int type, void *data)
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case MOD_UNLOAD:
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EVENTHANDLER_DEREGISTER(ifnet_departure_event,
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bridge_detach_cookie);
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uma_zdestroy(bridge_rtnode_zone);
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bridge_dn_p = NULL;
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break;
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default:
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@ -730,6 +731,9 @@ bridge_clone_destroy(struct ifnet *ifp)
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bridge_delete_span(sc, bif);
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}
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/* Tear down the routing table. */
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bridge_rtable_fini(sc);
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BRIDGE_UNLOCK(sc);
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callout_drain(&sc->sc_brcallout);
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@ -742,9 +746,6 @@ bridge_clone_destroy(struct ifnet *ifp)
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ether_ifdetach(ifp);
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if_free(ifp);
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/* Tear down the routing table. */
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bridge_rtable_fini(sc);
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BRIDGE_LOCK_DESTROY(sc);
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free(sc, M_DEVBUF);
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}
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@ -2669,7 +2670,7 @@ bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
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* initialize the expiration time and Ethernet
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* address.
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*/
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brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
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brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
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if (brt == NULL)
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return (ENOMEM);
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@ -2682,7 +2683,7 @@ bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
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brt->brt_vlan = vlan;
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if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
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uma_zfree(bridge_rtnode_zone, brt);
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uma_zfree(V_bridge_rtnode_zone, brt);
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return (error);
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}
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brt->brt_dst = bif;
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@ -2766,11 +2767,14 @@ bridge_timer(void *arg)
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BRIDGE_LOCK_ASSERT(sc);
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/* Destruction of rtnodes requires a proper vnet context */
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CURVNET_SET(sc->sc_ifp->if_vnet);
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bridge_rtage(sc);
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if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
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callout_reset(&sc->sc_brcallout,
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bridge_rtable_prune_period * hz, bridge_timer, sc);
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CURVNET_RESTORE();
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}
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/*
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@ -2886,6 +2890,7 @@ bridge_rtable_fini(struct bridge_softc *sc)
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KASSERT(sc->sc_brtcnt == 0,
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("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
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bridge_rtflush(sc, 1);
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free(sc->sc_rthash, M_DEVBUF);
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}
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@ -3028,7 +3033,7 @@ bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
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LIST_REMOVE(brt, brt_list);
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sc->sc_brtcnt--;
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brt->brt_dst->bif_addrcnt--;
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uma_zfree(bridge_rtnode_zone, brt);
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uma_zfree(V_bridge_rtnode_zone, brt);
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}
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/*
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