=====================================================
BUG: KMSAN: use-after-free in ip6_ignore_linkdown include/net/addrconf.h:402 [inline]
BUG: KMSAN: use-after-free in find_match+0x317/0x1480 net/ipv6/route.c:749
CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.6.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 ip6_ignore_linkdown include/net/addrconf.h:402 [inline]
 find_match+0x317/0x1480 net/ipv6/route.c:749
 __find_rr_leaf+0x3f9/0x1160 net/ipv6/route.c:837
 find_rr_leaf net/ipv6/route.c:858 [inline]
 rt6_select net/ipv6/route.c:902 [inline]
 fib6_table_lookup+0x586/0x1420 net/ipv6/route.c:2170
 ip6_pol_route+0x203/0x2960 net/ipv6/route.c:2206
 ip6_pol_route_input+0x123/0x140 net/ipv6/route.c:2264
 fib6_rule_lookup+0x38f/0xa10 net/ipv6/fib6_rules.c:114
 ip6_route_input_lookup net/ipv6/route.c:2276 [inline]
 ip6_route_input+0xb9d/0xcf0 net/ipv6/route.c:2445
 ip6_rcv_finish_core+0x1f9/0x470 net/ipv6/ip6_input.c:63
 ip6_rcv_finish+0x2e8/0x3b0 net/ipv6/ip6_input.c:74
 ip_sabotage_in+0x2f6/0x350 net/bridge/br_netfilter_hooks.c:870
 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline]
 nf_hook_slow+0x16e/0x400 net/netfilter/core.c:512
 nf_hook include/linux/netfilter.h:262 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ipv6_rcv+0x273/0x710 net/ipv6/ip6_input.c:306
 __netif_receive_skb_one_core net/core/dev.c:5198 [inline]
 __netif_receive_skb net/core/dev.c:5312 [inline]
 netif_receive_skb_internal net/core/dev.c:5402 [inline]
 netif_receive_skb+0x66b/0xf20 net/core/dev.c:5461
 br_netif_receive_skb net/bridge/br_input.c:29 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 br_pass_frame_up+0x964/0x9c0 net/bridge/br_input.c:64
 br_handle_frame_finish+0x1a37/0x1bb0 net/bridge/br_input.c:171
 br_nf_hook_thresh+0x4f7/0x680 net/bridge/br_netfilter_hooks.c:1021
 br_nf_pre_routing_finish_ipv6+0xe72/0x1000 net/bridge/br_netfilter_ipv6.c:187
 NF_HOOK include/linux/netfilter.h:307 [inline]
 br_nf_pre_routing_ipv6+0x6ad/0x7f0 net/bridge/br_netfilter_ipv6.c:236
 br_nf_pre_routing+0xd0e/0x1fd0 net/bridge/br_netfilter_hooks.c:505
 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:227 [inline]
 br_handle_frame+0xcd2/0x2050 net/bridge/br_input.c:352
 __netif_receive_skb_core+0x21de/0x5840 net/core/dev.c:5099
 __netif_receive_skb_one_core net/core/dev.c:5196 [inline]
 __netif_receive_skb net/core/dev.c:5312 [inline]
 process_backlog+0x936/0x1410 net/core/dev.c:6144
 napi_poll net/core/dev.c:6582 [inline]
 net_rx_action+0x786/0x1aa0 net/core/dev.c:6650
 __do_softirq+0x311/0x83d kernel/softirq.c:293
 run_ksoftirqd+0x25/0x40 kernel/softirq.c:607
 smpboot_thread_fn+0x493/0x980 kernel/smpboot.c:165
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127
 kmsan_slab_free+0x6e/0xb0 mm/kmsan/kmsan_hooks.c:107
 slab_free_freelist_hook mm/slub.c:1477 [inline]
 slab_free mm/slub.c:3040 [inline]
 kfree+0x565/0x30a0 mm/slub.c:3993
 tomoyo_find_next_domain+0x2f06/0x33a0 security/tomoyo/domain.c:883
 tomoyo_bprm_check_security+0x1a9/0x290 security/tomoyo/tomoyo.c:107
 security_bprm_check+0xb7/0x1e0 security/security.c:816
 search_binary_handler+0xb7/0xa20 fs/exec.c:1649
 exec_binprm fs/exec.c:1705 [inline]
 __do_execve_file+0x21c3/0x2e70 fs/exec.c:1825
 do_execveat_common fs/exec.c:1871 [inline]
 do_execve fs/exec.c:1888 [inline]
 __do_sys_execve fs/exec.c:1964 [inline]
 __se_sys_execve+0xec/0x110 fs/exec.c:1959
 __x64_sys_execve+0x4a/0x70 fs/exec.c:1959
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================