[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.20' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 56.024660][ T6812] ------------[ cut here ]------------ [ 56.030332][ T6812] hook not found, pf 2 num 0 [ 56.030640][ T6812] WARNING: CPU: 1 PID: 6812 at net/netfilter/core.c:413 __nf_unregister_net_hook+0x1eb/0x500 [ 56.045955][ T6812] Kernel panic - not syncing: panic_on_warn set ... [ 56.052621][ T6812] CPU: 1 PID: 6812 Comm: syz-executor057 Not tainted 5.8.0-rc4-syzkaller #0 [ 56.061275][ T6812] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.071325][ T6812] Call Trace: [ 56.074614][ T6812] dump_stack+0x18f/0x20d [ 56.078945][ T6812] panic+0x2e3/0x75c [ 56.082825][ T6812] ? __warn_printk+0xf3/0xf3 [ 56.087409][ T6812] ? __warn.cold+0x5/0x45 [ 56.091733][ T6812] ? __warn+0xd6/0x1f2 [ 56.095783][ T6812] ? __nf_unregister_net_hook+0x1eb/0x500 [ 56.101490][ T6812] __warn.cold+0x20/0x45 [ 56.105732][ T6812] ? __nf_unregister_net_hook+0x1eb/0x500 [ 56.111455][ T6812] report_bug+0x1bd/0x210 [ 56.115794][ T6812] handle_bug+0x38/0x90 [ 56.119942][ T6812] ? __warn_printk+0xc6/0xf3 [ 56.124523][ T6812] exc_invalid_op+0x13/0x40 [ 56.129028][ T6812] asm_exc_invalid_op+0x12/0x20 [ 56.133860][ T6812] RIP: 0010:__nf_unregister_net_hook+0x1eb/0x500 [ 56.140790][ T6812] Code: 0f b6 14 02 48 89 c8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 09 03 00 00 8b 53 1c 89 ee 48 c7 c7 e0 d3 02 89 e8 27 92 d7 fa <0f> 0b e9 b1 00 00 00 e8 b9 51 06 fb 44 8b 3c 24 4c 89 f8 48 c1 e0 [ 56.160907][ T6812] RSP: 0018:ffffc900016073e0 EFLAGS: 00010286 [ 56.166954][ T6812] RAX: 0000000000000000 RBX: ffff88809ef98a00 RCX: 0000000000000000 [ 56.174933][ T6812] RDX: ffff88809ab0e480 RSI: ffffffff815d4f87 RDI: fffff520002c0e6e [ 56.186619][ T6812] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 [ 56.194583][ T6812] R10: 000000000000059a R11: 0000000000000000 R12: ffffffff8a7a8048 [ 56.202544][ T6812] R13: 0000000000000000 R14: ffff8880a8fffe00 R15: 0000000000000005 [ 56.210523][ T6812] ? vprintk_func+0x97/0x1a6 [ 56.215112][ T6812] nf_unregister_net_hook+0x59/0xa0 [ 56.220300][ T6812] nft_table_disable+0xb3/0x2d0 [ 56.225147][ T6812] nf_tables_commit+0x2dcf/0x4155 [ 56.230349][ T6812] ? nf_tables_setelem_notify.constprop.0+0x1e0/0x1e0 [ 56.237107][ T6812] ? __nla_parse+0x3d/0x4a [ 56.241537][ T6812] nfnetlink_rcv_batch+0xb2c/0x1de0 [ 56.246829][ T6812] ? __nf_tables_abort+0x2411/0x2f50 [ 56.252134][ T6812] ? nfnetlink_bind+0x2b0/0x2b0 [ 56.258897][ T6812] ? lock_is_held_type+0xb0/0xe0 [ 56.263837][ T6812] ? nla_get_range_signed+0x520/0x520 [ 56.269198][ T6812] ? netlink_deliver_tap+0x146/0xb70 [ 56.274484][ T6812] ? apparmor_capable+0x1d8/0x460 [ 56.279513][ T6812] ? security_capable+0x8f/0xc0 [ 56.284358][ T6812] ? __nla_parse+0x3d/0x4a [ 56.288771][ T6812] nfnetlink_rcv+0x3af/0x420 [ 56.293431][ T6812] ? nfnetlink_rcv_batch+0x1de0/0x1de0 [ 56.298881][ T6812] netlink_unicast+0x533/0x7d0 [ 56.303641][ T6812] ? netlink_attachskb+0x810/0x810 [ 56.308773][ T6812] ? _copy_from_iter_full+0x247/0x890 [ 56.314139][ T6812] ? __phys_addr+0x9a/0x110 [ 56.318642][ T6812] ? __phys_addr_symbol+0x2c/0x70 [ 56.323657][ T6812] ? __check_object_size+0x171/0x3e4 [ 56.328949][ T6812] netlink_sendmsg+0x856/0xd90 [ 56.333720][ T6812] ? netlink_unicast+0x7d0/0x7d0 [ 56.338654][ T6812] ? netlink_unicast+0x7d0/0x7d0 [ 56.343573][ T6812] sock_sendmsg+0xcf/0x120 [ 56.347993][ T6812] ____sys_sendmsg+0x6e8/0x810 [ 56.352739][ T6812] ? kernel_sendmsg+0x50/0x50 [ 56.357402][ T6812] ? do_recvmmsg+0x6d0/0x6d0 [ 56.362016][ T6812] ? lock_acquire+0x1f1/0xad0 [ 56.366704][ T6812] ? do_huge_pmd_anonymous_page+0x120d/0x2230 [ 56.372755][ T6812] ? find_held_lock+0x2d/0x110 [ 56.377509][ T6812] ___sys_sendmsg+0xf3/0x170 [ 56.382101][ T6812] ? sendmsg_copy_msghdr+0x160/0x160 [ 56.387386][ T6812] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 56.393360][ T6812] ? do_huge_pmd_anonymous_page+0x8ef/0x2230 [ 56.399322][ T6812] ? handle_mm_fault+0xad9/0x43f0 [ 56.404327][ T6812] ? find_held_lock+0x2d/0x110 [ 56.409099][ T6812] ? __fget_light+0x215/0x280 [ 56.413765][ T6812] __sys_sendmsg+0xe5/0x1b0 [ 56.419218][ T6812] ? __sys_sendmsg_sock+0xb0/0xb0 [ 56.424231][ T6812] ? do_syscall_64+0x1c/0xe0 [ 56.428818][ T6812] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 56.434784][ T6812] do_syscall_64+0x60/0xe0 [ 56.439204][ T6812] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.445081][ T6812] RIP: 0033:0x440709 [ 56.448949][ T6812] Code: Bad RIP value. [ 56.453005][ T6812] RSP: 002b:00007ffffd1380a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 56.461422][ T6812] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440709 [ 56.469432][ T6812] RDX: 0000000000000000 RSI: 000000002000c2c0 RDI: 0000000000000003 [ 56.477396][ T6812] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 56.485353][ T6812] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000401f10 [ 56.493326][ T6812] R13: 0000000000401fa0 R14: 0000000000000000 R15: 0000000000000000 [ 56.502549][ T6812] Kernel Offset: disabled [ 56.507104][ T6812] Rebooting in 86400 seconds..