------------[ cut here ]------------
WARNING: CPU: 0 PID: 13378 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: 0 PID: 13378 Comm: syz-executor.1 Not tainted 5.8.0-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+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x4a kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:nsim_fib6_rt_nh_del+0x267/0x330 drivers/net/netdevsim/fib.c:448
Code: e8 0e d5 6b fc 85 db 74 32 e8 85 d8 6b fc 48 89 ef e8 ed 73 ab fc 5b 5d 41 5c 41 5d 41 5e 41 5f e9 6e d8 6b fc e8 69 d8 6b fc <0f> 0b 5b 5d 41 5c 41 5d 41 5e 41 5f e9 58 d8 6b fc e8 53 d8 6b fc
RSP: 0018:ffffc900177cef98 EFLAGS: 00010212
RAX: 00000000000010a2 RBX: dffffc0000000000 RCX: ffffc9000aa5e000
RDX: 0000000000040000 RSI: ffffffff85087417 RDI: ffff8880908d3680
RBP: ffff8880908d36b8 R08: 0000000000000001 R09: ffff88805c156cc8
R10: 0000000000000001 R11: 00000000000066d0 R12: ffff888092fc4550
R13: ffff88809ef07000 R14: ffff8880908d36b8 R15: ffff8880908d3680
 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+0x1230/0x2880 drivers/net/netdevsim/fib.c:772
 notifier_call_chain+0xb5/0x200 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 net/ipv6/ip6_fib.c:400 [inline]
 fib6_del_route net/ipv6/ip6_fib.c:1982 [inline]
 fib6_del+0xf7d/0x1630 net/ipv6/ip6_fib.c:2018
 __ip6_del_rt net/ipv6/route.c:3763 [inline]
 ip6_del_rt+0xf3/0x200 net/ipv6/route.c:3778
 ndisc_router_discovery+0x2368/0x2ce0 net/ipv6/ndisc.c:1305
 ndisc_rcv+0x451/0x500 net/ipv6/ndisc.c:1764
 icmpv6_rcv+0x13d5/0x1bd0 net/ipv6/icmp.c:933
 ip6_protocol_deliver_rcu+0x2e8/0x1660 net/ipv6/ip6_input.c:433
 ip6_input_finish+0x7f/0x160 net/ipv6/ip6_input.c:474
 NF_HOOK include/linux/netfilter.h:301 [inline]
 NF_HOOK include/linux/netfilter.h:295 [inline]
 ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:483
 ip6_mc_input+0x411/0xea0 net/ipv6/ip6_input.c:577
 dst_input include/net/dst.h:449 [inline]
 ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 NF_HOOK include/linux/netfilter.h:295 [inline]
 ipv6_rcv+0x28e/0x3c0 net/ipv6/ip6_input.c:307
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5286
 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5400
 netif_receive_skb_internal net/core/dev.c:5500 [inline]
 netif_receive_skb+0x159/0x990 net/core/dev.c:5559
 tun_rx_batched.isra.0+0x460/0x720 drivers/net/tun.c:1503
 tun_get_user+0x23b1/0x35b0 drivers/net/tun.c:1957
 tun_chr_write_iter+0xba/0x151 drivers/net/tun.c:1986
 call_write_iter include/linux/fs.h:1882 [inline]
 new_sync_write+0x422/0x650 fs/read_write.c:503
 vfs_write+0x5ad/0x730 fs/read_write.c:578
 ksys_write+0x12d/0x250 fs/read_write.c:631
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x416ac1
Code: 75 14 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 c4 1b 00 00 c3 48 83 ec 08 e8 ca fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 13 fd ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fb44fa5ec60 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000118cf40 RCX: 0000000000416ac1
RDX: 000000000000009e RSI: 0000000020000200 RDI: 00000000000000f0
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fb44fa5f9d0 R11: 0000000000000293 R12: 000000000118cf4c
R13: 000000000169fb6f R14: 00007fb44fa5f9c0 R15: 000000000118cf4c
Kernel Offset: disabled
Rebooting in 86400 seconds..