------------[ cut here ]------------ WARNING: CPU: 1 PID: 20894 at drivers/net/netdevsim/fib.c:448 nsim_fib6_rt_nh_del+0x267/0x330 drivers/net/netdevsim/fib.c:448 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 20894 Comm: syz-executor.4 Not tainted 5.7.0-rc1-next-20200415-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+0x188/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x27b/0x2f0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:175 [inline] fixup_bug arch/x86/kernel/traps.c:170 [inline] do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:nsim_fib6_rt_nh_del+0x267/0x330 drivers/net/netdevsim/fib.c:448 Code: e8 3e dd 78 fc 85 db 74 32 e8 95 db 78 fc 48 89 ef e8 3d af b6 fc 5b 5d 41 5c 41 5d 41 5e 41 5f e9 7e db 78 fc e8 79 db 78 fc <0f> 0b 5b 5d 41 5c 41 5d 41 5e 41 5f e9 68 db 78 fc e8 63 db 78 fc RSP: 0018:ffffc90015c4e488 EFLAGS: 00010246 RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc90010e6e000 RDX: 0000000000040000 RSI: ffffffff84fa5917 RDI: ffff8880a866d900 RBP: ffff8880a866d938 R08: ffff8880913445c0 R09: fffffbfff15169c1 R10: ffffc90015c4e4c0 R11: fffffbfff15169c0 R12: ffff8880a3d1ae10 R13: ffff8880a875ee00 R14: ffff8880a866d938 R15: ffff8880a866d900 nsim_fib6_rt_remove drivers/net/netdevsim/fib.c:688 [inline] nsim_fib6_event drivers/net/netdevsim/fib.c:725 [inline] nsim_fib_event drivers/net/netdevsim/fib.c:744 [inline] nsim_fib_event_nb+0x14bb/0x24e0 drivers/net/netdevsim/fib.c:772 notifier_call_chain+0xc0/0x230 kernel/notifier.c:83 __atomic_notifier_call_chain+0x95/0x180 kernel/notifier.c:173 call_fib_notifiers+0x166/0x290 net/core/fib_notifier.c:35 call_fib6_entry_notifiers+0xfb/0x150 net/ipv6/ip6_fib.c:399 fib6_del_route net/ipv6/ip6_fib.c:1981 [inline] fib6_del+0xe69/0x14f0 net/ipv6/ip6_fib.c:2017 fib6_clean_node+0x39b/0x570 net/ipv6/ip6_fib.c:2179 fib6_walk_continue+0x4aa/0x8e0 net/ipv6/ip6_fib.c:2101 fib6_walk+0x91/0xf0 net/ipv6/ip6_fib.c:2149 fib6_clean_tree+0xdb/0x120 net/ipv6/ip6_fib.c:2229 __fib6_clean_all+0x118/0x2a0 net/ipv6/ip6_fib.c:2245 rt6_sync_down_dev+0x12a/0x150 net/ipv6/route.c:4749 rt6_disable_ip+0x24/0x460 net/ipv6/route.c:4754 addrconf_ifdown+0x9d/0x12f0 net/ipv6/addrconf.c:3718 addrconf_notify+0x5cd/0x2310 net/ipv6/addrconf.c:3643 notifier_call_chain+0xc0/0x230 kernel/notifier.c:83 call_netdevice_notifiers_info net/core/dev.c:1948 [inline] call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1933 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline] call_netdevice_notifiers net/core/dev.c:1974 [inline] __dev_notify_flags+0x1e9/0x2c0 net/core/dev.c:8184 dev_change_flags+0x100/0x160 net/core/dev.c:8220 do_setlink+0xa1c/0x3680 net/core/rtnetlink.c:2598 rtnl_group_changelink net/core/rtnetlink.c:3117 [inline] __rtnl_newlink+0xc96/0x1590 net/core/rtnetlink.c:3271 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3391 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5454 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f752b7a7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000500f40 RCX: 000000000045ca29 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a04 R14: 00000000004ccdcc R15: 00007f752b7a86d4 Kernel Offset: disabled Rebooting in 86400 seconds..