[ 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 '10.128.0.141' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 57.044526][ T6802] ------------[ cut here ]------------ [ 57.050072][ T6802] hook not found, pf 2 num 0 [ 57.050423][ T6802] WARNING: CPU: 0 PID: 6802 at net/netfilter/core.c:413 __nf_unregister_net_hook+0x1eb/0x500 [ 57.066118][ T6802] Kernel panic - not syncing: panic_on_warn set ... [ 57.072698][ T6802] CPU: 0 PID: 6802 Comm: syz-executor019 Not tainted 5.8.0-rc4-next-20200710-syzkaller #0 [ 57.082552][ T6802] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.092580][ T6802] Call Trace: [ 57.095890][ T6802] dump_stack+0x18f/0x20d [ 57.100196][ T6802] panic+0x2e3/0x75c [ 57.104066][ T6802] ? __warn_printk+0xf3/0xf3 [ 57.108634][ T6802] ? __warn.cold+0x5/0x45 [ 57.112937][ T6802] ? __warn+0xd6/0x1f2 [ 57.116984][ T6802] ? __nf_unregister_net_hook+0x1eb/0x500 [ 57.122677][ T6802] __warn.cold+0x20/0x45 [ 57.126893][ T6802] ? __nf_unregister_net_hook+0x1eb/0x500 [ 57.132584][ T6802] report_bug+0x1bd/0x210 [ 57.136891][ T6802] handle_bug+0x38/0x90 [ 57.141057][ T6802] ? __warn_printk+0xc6/0xf3 [ 57.145618][ T6802] exc_invalid_op+0x13/0x40 [ 57.150135][ T6802] asm_exc_invalid_op+0x12/0x20 [ 57.154964][ T6802] RIP: 0010:__nf_unregister_net_hook+0x1eb/0x500 [ 57.161264][ T6802] 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 80 4e 03 89 e8 f7 55 d3 fa <0f> 0b e9 b1 00 00 00 e8 e9 1d 02 fb 44 8b 3c 24 4c 89 f8 48 c1 e0 [ 57.180838][ T6802] RSP: 0018:ffffc900014773e0 EFLAGS: 00010286 [ 57.186876][ T6802] RAX: 0000000000000000 RBX: ffff8880a3a06200 RCX: 0000000000000000 [ 57.194820][ T6802] RDX: ffff8880a2a86080 RSI: ffffffff815d7e07 RDI: fffff5200028ee6e [ 57.202850][ T6802] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 [ 57.210792][ T6802] R10: 000000000000059d R11: 0000000000000000 R12: ffffffff8a7b1e08 [ 57.218737][ T6802] R13: 0000000000000000 R14: ffff8880a69f5500 R15: 0000000000000005 [ 57.226690][ T6802] ? vprintk_func+0x97/0x1a6 [ 57.231258][ T6802] nf_unregister_net_hook+0x59/0xa0 [ 57.236433][ T6802] nft_table_disable+0xb3/0x2d0 [ 57.241259][ T6802] nf_tables_commit+0x2e5a/0x422b [ 57.246260][ T6802] ? nf_tables_setelem_notify.constprop.0+0x460/0x460 [ 57.253038][ T6802] ? __nla_parse+0x3d/0x4a [ 57.257431][ T6802] nfnetlink_rcv_batch+0xb2c/0x1de0 [ 57.262620][ T6802] ? nf_tables_fill_set+0x7c1/0x1390 [ 57.267881][ T6802] ? nfnetlink_bind+0x2b0/0x2b0 [ 57.272713][ T6802] ? lock_is_held_type+0xb0/0xe0 [ 57.277628][ T6802] ? nla_get_range_signed+0x520/0x520 [ 57.282973][ T6802] ? netlink_deliver_tap+0x146/0xb70 [ 57.288331][ T6802] ? apparmor_capable+0x1d8/0x460 [ 57.293330][ T6802] ? security_capable+0x8f/0xc0 [ 57.298154][ T6802] ? __nla_parse+0x3d/0x4a [ 57.302546][ T6802] nfnetlink_rcv+0x3af/0x420 [ 57.307108][ T6802] ? nfnetlink_rcv_batch+0x1de0/0x1de0 [ 57.312541][ T6802] ? lock_is_held_type+0xb0/0xe0 [ 57.317453][ T6802] netlink_unicast+0x533/0x7d0 [ 57.322189][ T6802] ? netlink_attachskb+0x810/0x810 [ 57.327272][ T6802] ? _copy_from_iter_full+0x247/0x890 [ 57.332617][ T6802] ? __phys_addr+0x9a/0x110 [ 57.337091][ T6802] ? __phys_addr_symbol+0x2c/0x70 [ 57.343216][ T6802] ? __check_object_size+0x171/0x3e4 [ 57.348489][ T6802] netlink_sendmsg+0x856/0xd90 [ 57.353228][ T6802] ? netlink_unicast+0x7d0/0x7d0 [ 57.358142][ T6802] ? netlink_unicast+0x7d0/0x7d0 [ 57.363053][ T6802] sock_sendmsg+0xcf/0x120 [ 57.367442][ T6802] ____sys_sendmsg+0x6e8/0x810 [ 57.372179][ T6802] ? kernel_sendmsg+0x50/0x50 [ 57.376830][ T6802] ? do_recvmmsg+0x6d0/0x6d0 [ 57.381395][ T6802] ? lock_acquire+0x1f1/0xad0 [ 57.386046][ T6802] ? do_huge_pmd_anonymous_page+0x120d/0x2230 [ 57.392084][ T6802] ? find_held_lock+0x2d/0x110 [ 57.396823][ T6802] ___sys_sendmsg+0xf3/0x170 [ 57.401393][ T6802] ? sendmsg_copy_msghdr+0x160/0x160 [ 57.406655][ T6802] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 57.412612][ T6802] ? do_huge_pmd_anonymous_page+0x8ef/0x2230 [ 57.418570][ T6802] ? handle_mm_fault+0xb78/0x45e0 [ 57.423582][ T6802] ? find_held_lock+0x2d/0x110 [ 57.428320][ T6802] ? __fget_light+0x215/0x280 [ 57.432975][ T6802] __sys_sendmsg+0xe5/0x1b0 [ 57.437453][ T6802] ? __sys_sendmsg_sock+0xb0/0xb0 [ 57.442449][ T6802] ? vmacache_update+0xce/0x140 [ 57.447281][ T6802] ? do_syscall_64+0x1c/0xe0 [ 57.451842][ T6802] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 57.457795][ T6802] do_syscall_64+0x60/0xe0 [ 57.462184][ T6802] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.468055][ T6802] RIP: 0033:0x440709 [ 57.471917][ T6802] Code: Bad RIP value. [ 57.475955][ T6802] RSP: 002b:00007ffdf3c160e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 57.484337][ T6802] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440709 [ 57.492291][ T6802] RDX: 0000000000000000 RSI: 000000002000c2c0 RDI: 0000000000000003 [ 57.500249][ T6802] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 57.508197][ T6802] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000401f10 [ 57.516141][ T6802] R13: 0000000000401fa0 R14: 0000000000000000 R15: 0000000000000000 [ 57.525352][ T6802] Kernel Offset: disabled [ 57.529724][ T6802] Rebooting in 86400 seconds..