[ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started System Logging Service. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.183' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 55.219020][ T6808] ------------[ cut here ]------------ [ 55.224627][ T6808] hook not found, pf 2 num 0 [ 55.224916][ T6808] WARNING: CPU: 1 PID: 6808 at net/netfilter/core.c:413 __nf_unregister_net_hook+0x1eb/0x500 [ 55.240640][ T6808] Kernel panic - not syncing: panic_on_warn set ... [ 55.247226][ T6808] CPU: 1 PID: 6808 Comm: syz-executor741 Not tainted 5.8.0-rc4-syzkaller #0 [ 55.255878][ T6808] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.265906][ T6808] Call Trace: [ 55.269177][ T6808] dump_stack+0x18f/0x20d [ 55.273483][ T6808] panic+0x2e3/0x75c [ 55.277357][ T6808] ? __warn_printk+0xf3/0xf3 [ 55.281939][ T6808] ? __warn.cold+0x5/0x45 [ 55.286281][ T6808] ? __warn+0xd6/0x1f2 [ 55.290352][ T6808] ? __nf_unregister_net_hook+0x1eb/0x500 [ 55.296044][ T6808] __warn.cold+0x20/0x45 [ 55.300288][ T6808] ? __nf_unregister_net_hook+0x1eb/0x500 [ 55.305981][ T6808] report_bug+0x1bd/0x210 [ 55.310289][ T6808] handle_bug+0x38/0x90 [ 55.314424][ T6808] ? __warn_printk+0xc6/0xf3 [ 55.318992][ T6808] exc_invalid_op+0x13/0x40 [ 55.323475][ T6808] asm_exc_invalid_op+0x12/0x20 [ 55.328309][ T6808] RIP: 0010:__nf_unregister_net_hook+0x1eb/0x500 [ 55.334613][ T6808] 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 60 0e 03 89 e8 b7 32 d6 fa <0f> 0b e9 b1 00 00 00 e8 49 f2 04 fb 44 8b 3c 24 4c 89 f8 48 c1 e0 [ 55.354205][ T6808] RSP: 0018:ffffc900014773e0 EFLAGS: 00010286 [ 55.360243][ T6808] RAX: 0000000000000000 RBX: ffff88809e69b200 RCX: 0000000000000000 [ 55.368200][ T6808] RDX: ffff8880a2dfa240 RSI: ffffffff815d4f87 RDI: fffff5200028ee6e [ 55.376152][ T6808] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 [ 55.384099][ T6808] R10: 000000000000059d R11: 0000000000000000 R12: ffffffff8a7a96c8 [ 55.392046][ T6808] R13: 0000000000000000 R14: ffff8880a8984100 R15: 0000000000000005 [ 55.400009][ T6808] ? vprintk_func+0x97/0x1a6 [ 55.404695][ T6808] nf_unregister_net_hook+0x59/0xa0 [ 55.409875][ T6808] nft_table_disable+0xb3/0x2d0 [ 55.414720][ T6808] nf_tables_commit+0x2dcf/0x4155 [ 55.419728][ T6808] ? nf_tables_setelem_notify.constprop.0+0x1e0/0x1e0 [ 55.426478][ T6808] ? __nla_parse+0x3d/0x4a [ 55.430874][ T6808] nfnetlink_rcv_batch+0xb2c/0x1de0 [ 55.436062][ T6808] ? nf_tables_dump_sets+0x891/0xac0 [ 55.441329][ T6808] ? nfnetlink_bind+0x2b0/0x2b0 [ 55.446172][ T6808] ? lock_is_held_type+0xb0/0xe0 [ 55.451115][ T6808] ? nla_get_range_signed+0x520/0x520 [ 55.456463][ T6808] ? netlink_deliver_tap+0x146/0xb70 [ 55.461723][ T6808] ? apparmor_capable+0x1d8/0x460 [ 55.466732][ T6808] ? security_capable+0x8f/0xc0 [ 55.471573][ T6808] ? __nla_parse+0x3d/0x4a [ 55.475969][ T6808] nfnetlink_rcv+0x3af/0x420 [ 55.480549][ T6808] ? nfnetlink_rcv_batch+0x1de0/0x1de0 [ 55.485994][ T6808] netlink_unicast+0x533/0x7d0 [ 55.490735][ T6808] ? netlink_attachskb+0x810/0x810 [ 55.495836][ T6808] ? _copy_from_iter_full+0x247/0x890 [ 55.501192][ T6808] ? __phys_addr+0x9a/0x110 [ 55.505685][ T6808] ? __phys_addr_symbol+0x2c/0x70 [ 55.510687][ T6808] ? __check_object_size+0x171/0x3e4 [ 55.515953][ T6808] netlink_sendmsg+0x856/0xd90 [ 55.520695][ T6808] ? netlink_unicast+0x7d0/0x7d0 [ 55.525622][ T6808] ? netlink_unicast+0x7d0/0x7d0 [ 55.530536][ T6808] sock_sendmsg+0xcf/0x120 [ 55.534934][ T6808] ____sys_sendmsg+0x6e8/0x810 [ 55.539700][ T6808] ? kernel_sendmsg+0x50/0x50 [ 55.544354][ T6808] ? do_recvmmsg+0x6d0/0x6d0 [ 55.548935][ T6808] ? lock_acquire+0x1f1/0xad0 [ 55.553586][ T6808] ? do_huge_pmd_anonymous_page+0x120d/0x2230 [ 55.559625][ T6808] ? find_held_lock+0x2d/0x110 [ 55.564367][ T6808] ___sys_sendmsg+0xf3/0x170 [ 55.568935][ T6808] ? sendmsg_copy_msghdr+0x160/0x160 [ 55.574196][ T6808] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 55.580154][ T6808] ? do_huge_pmd_anonymous_page+0x8ef/0x2230 [ 55.586124][ T6808] ? handle_mm_fault+0xad9/0x43f0 [ 55.591124][ T6808] ? find_held_lock+0x2d/0x110 [ 55.595878][ T6808] ? __fget_light+0x215/0x280 [ 55.600533][ T6808] __sys_sendmsg+0xe5/0x1b0 [ 55.605032][ T6808] ? __sys_sendmsg_sock+0xb0/0xb0 [ 55.610036][ T6808] ? do_syscall_64+0x1c/0xe0 [ 55.614603][ T6808] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 55.620567][ T6808] do_syscall_64+0x60/0xe0 [ 55.624968][ T6808] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.630839][ T6808] RIP: 0033:0x440709 [ 55.634704][ T6808] Code: Bad RIP value. [ 55.638745][ T6808] RSP: 002b:00007ffcfefd5728 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 55.647139][ T6808] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440709 [ 55.655086][ T6808] RDX: 0000000000000000 RSI: 000000002000c2c0 RDI: 0000000000000003 [ 55.663029][ T6808] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 55.670972][ T6808] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000401f10 [ 55.678929][ T6808] R13: 0000000000401fa0 R14: 0000000000000000 R15: 0000000000000000 [ 55.688066][ T6808] Kernel Offset: disabled [ 55.692443][ T6808] Rebooting in 86400 seconds..