===================================================== 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: 12620 Comm: syz-executor.5 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 net/ipv6/ip6_input.c:74 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ipv6_rcv+0x628/0x710 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] process_backlog+0xa41/0x1410 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 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:546 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1149 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:834 RIP: 0010:_raw_spin_unlock_irqrestore+0x4b/0x70 kernel/locking/spinlock.c:192 Code: 00 8b b8 88 0c 00 00 48 8b 00 48 85 c0 75 28 48 89 df e8 c8 d1 96 f3 c6 00 00 c6 03 00 4d 85 e4 75 1c 4c 89 7d d8 ff 75 d8 9d <48> 83 c4 08 5b 41 5c 41 5e 41 5f 5d c3 e8 63 d7 96 f3 eb d1 44 89 RSP: 0018:ffffa48c0123fb98 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff8a9f1fe75ac0 RBX: ffff8a9e2fc1eac0 RCX: ffffe79505eec960 RDX: ffff8a9f1fdcdac0 RSI: 0000000000000000 RDI: ffff8a9e2fc1eac0 RBP: ffffa48c0123fbc0 R08: ffffe7950000000f R09: ffff8a9e2fffb000 R10: 000000a2aa3fa392 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000286 unlock_hrtimer_base kernel/time/hrtimer.c:898 [inline] hrtimer_start_range_ns+0x1631/0x1660 kernel/time/hrtimer.c:1136 hrtimer_start_expires include/linux/hrtimer.h:435 [inline] hrtimer_sleeper_start_expires kernel/time/hrtimer.c:1795 [inline] do_nanosleep+0x1cc/0x940 kernel/time/hrtimer.c:1871 hrtimer_nanosleep kernel/time/hrtimer.c:1927 [inline] __do_sys_nanosleep_time32 kernel/time/hrtimer.c:1982 [inline] __se_sys_nanosleep_time32+0x55e/0x780 kernel/time/hrtimer.c:1969 __ia32_sys_nanosleep_time32+0x91/0xc0 kernel/time/hrtimer.c:1969 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline] do_fast_syscall_32+0x3c7/0x6e0 arch/x86/entry/common.c:410 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f79d99 Code: 90 e8 0b 00 00 00 f3 90 0f ae e8 eb f9 8d 74 26 00 89 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000ffe193ec EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00000000ffe19418 RCX: 0000000000000000 RDX: 0000000000000008 RSI: 00000000000aa6fa RDI: 0000000000000000 RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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 __netdev_name_node_alt_destroy net/core/dev.c:322 [inline] netdev_name_node_alt_destroy+0x587/0x690 net/core/dev.c:334 rtnl_alt_ifname net/core/rtnetlink.c:3518 [inline] rtnl_linkprop+0x939/0xc00 net/core/rtnetlink.c:3567 rtnl_dellinkprop+0x9d/0xb0 net/core/rtnetlink.c:3588 rtnetlink_rcv_msg+0x1153/0x1570 net/core/rtnetlink.c:5438 netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5456 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343 ___sys_sendmsg net/socket.c:2397 [inline] __sys_sendmsg+0x451/0x5f0 net/socket.c:2430 __compat_sys_sendmsg net/compat.c:642 [inline] __do_compat_sys_sendmsg net/compat.c:649 [inline] __se_compat_sys_sendmsg net/compat.c:646 [inline] __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:646 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline] do_fast_syscall_32+0x3c7/0x6e0 arch/x86/entry/common.c:410 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139 =====================================================