------------[ cut here ]------------
WARNING: CPU: 1 PID: 7258 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: 7258 Comm: syz-executor.5 Not tainted 5.8.0-rc6-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+0x20/0x45 kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:540
RIP: 0010:nsim_fib6_rt_nh_del+0x267/0x330 drivers/net/netdevsim/fib.c:448
Code: e8 3e 40 6f fc 85 db 74 32 e8 b5 43 6f fc 48 89 ef e8 1d 59 ae fc 5b 5d 41 5c 41 5d 41 5e 41 5f e9 9e 43 6f fc e8 99 43 6f fc <0f> 0b 5b 5d 41 5c 41 5d 41 5e 41 5f e9 88 43 6f fc e8 83 43 6f fc
RSP: 0018:ffffc900052b7040 EFLAGS: 00010293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff8504ca9d
RDX: ffff888052960280 RSI: ffffffff850478f7 RDI: ffff8880a2a9a400
RBP: ffff8880a2a9a438 R08: 0000000000000001 R09: ffff888052960b48
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880a67f7690
R13: ffff88808ffbd600 R14: ffff8880a2a9a438 R15: ffff8880a2a9a400
 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:399 [inline]
 fib6_del_route net/ipv6/ip6_fib.c:1981 [inline]
 fib6_del+0xf7d/0x1630 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+0x182/0x370 net/ipv6/ip6_fib.c:2149
 fib6_clean_tree+0xdb/0x120 net/ipv6/ip6_fib.c:2229
 __fib6_clean_all+0x120/0x290 net/ipv6/ip6_fib.c:2245
 rt6_sync_down_dev net/ipv6/route.c:4778 [inline]
 rt6_disable_ip+0x775/0x870 net/ipv6/route.c:4783
 addrconf_ifdown.isra.0+0xf6/0x1570 net/ipv6/addrconf.c:3677
 addrconf_notify+0x55c/0x2310 net/ipv6/addrconf.c:3602
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
 call_netdevice_notifiers net/core/dev.c:2053 [inline]
 dev_close_many+0x30b/0x650 net/core/dev.c:1628
 rollback_registered_many+0x3af/0xf60 net/core/dev.c:8945
 rollback_registered net/core/dev.c:9013 [inline]
 unregister_netdevice_queue+0x2dd/0x570 net/core/dev.c:10094
 unregister_netdevice include/linux/netdevice.h:2754 [inline]
 __tun_detach+0xff6/0x1310 drivers/net/tun.c:691
 tun_detach drivers/net/tun.c:708 [inline]
 tun_chr_close+0xd9/0x180 drivers/net/tun.c:3423
 __fput+0x33c/0x880 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:135
 exit_task_work include/linux/task_work.h:25 [inline]
 do_exit+0xb72/0x2a40 kernel/exit.c:805
 do_group_exit+0x125/0x310 kernel/exit.c:903
 __do_sys_exit_group kernel/exit.c:914 [inline]
 __se_sys_exit_group kernel/exit.c:912 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:912
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007ffd90014798 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045c1f9
RDX: 0000000000415c90 RSI: 0000000000ca85f0 RDI: 0000000000000043
RBP: 00000000004c1e13 R08: 000000000000000b R09: 0000000000000000
R10: 0000000001bc1940 R11: 0000000000000246 R12: 0000000000000009
R13: 00007ffd900148e0 R14: 0000000000078cd1 R15: 00007ffd900148f0
Kernel Offset: disabled
Rebooting in 86400 seconds..