[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.108' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 57.869020][ T6805] ------------[ cut here ]------------ [ 57.874769][ T6805] hook not found, pf 2 num 0 [ 57.875112][ T6805] WARNING: CPU: 0 PID: 6805 at net/netfilter/core.c:413 __nf_unregister_net_hook+0x1eb/0x500 [ 57.891911][ T6805] Kernel panic - not syncing: panic_on_warn set ... [ 57.898638][ T6805] CPU: 0 PID: 6805 Comm: syz-executor436 Not tainted 5.8.0-rc4-syzkaller #0 [ 57.908110][ T6805] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.918960][ T6805] Call Trace: [ 57.922248][ T6805] dump_stack+0x18f/0x20d [ 57.926621][ T6805] panic+0x2e3/0x75c [ 57.930783][ T6805] ? __warn_printk+0xf3/0xf3 [ 57.935381][ T6805] ? mark_held_locks+0x9f/0xe0 [ 57.940137][ T6805] ? __warn.cold+0x5/0x45 [ 57.944481][ T6805] ? __warn+0xd6/0x1f2 [ 57.948561][ T6805] ? __nf_unregister_net_hook+0x1eb/0x500 [ 57.955506][ T6805] __warn.cold+0x20/0x45 [ 57.959770][ T6805] ? lockdep_hardirqs_on+0x6a/0xe0 [ 57.964903][ T6805] ? __nf_unregister_net_hook+0x1eb/0x500 [ 57.970633][ T6805] report_bug+0x1bd/0x210 [ 57.974959][ T6805] handle_bug+0x38/0x90 [ 57.979361][ T6805] exc_invalid_op+0x13/0x40 [ 57.984030][ T6805] asm_exc_invalid_op+0x12/0x20 [ 57.989406][ T6805] RIP: 0010:__nf_unregister_net_hook+0x1eb/0x500 [ 57.995805][ T6805] 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 37 92 d7 fa <0f> 0b e9 b1 00 00 00 e8 c9 51 06 fb 44 8b 3c 24 4c 89 f8 48 c1 e0 [ 58.016377][ T6805] RSP: 0018:ffffc900015773c8 EFLAGS: 00010282 [ 58.022434][ T6805] RAX: 0000000000000000 RBX: ffff8880a7b3f000 RCX: 0000000000000000 [ 58.030587][ T6805] RDX: ffff8880a6076040 RSI: ffffffff815d4f87 RDI: fffff520002aee6b [ 58.038548][ T6805] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 [ 58.046626][ T6805] R10: 000000000000059e R11: 0000000000000000 R12: ffffffff8a7a8048 [ 58.054592][ T6805] R13: 0000000000000000 R14: ffff8880a7b39500 R15: 0000000000000005 [ 58.062567][ T6805] ? vprintk_func+0x97/0x1a6 [ 58.067141][ T6805] ? __nf_unregister_net_hook+0x1eb/0x500 [ 58.072866][ T6805] nf_unregister_net_hook+0x59/0xa0 [ 58.078071][ T6805] nft_table_disable+0xb3/0x2d0 [ 58.082926][ T6805] nf_tables_commit+0x2dcf/0x4155 [ 58.087952][ T6805] ? nf_tables_setelem_notify.constprop.0+0x1e0/0x1e0 [ 58.095215][ T6805] ? __nla_parse+0x3d/0x4a [ 58.099657][ T6805] nfnetlink_rcv_batch+0xb2c/0x1de0 [ 58.104851][ T6805] ? __nf_tables_abort+0x2421/0x2f50 [ 58.110146][ T6805] ? nfnetlink_bind+0x2b0/0x2b0 [ 58.115005][ T6805] ? lockdep_hardirqs_on+0x6a/0xe0 [ 58.120117][ T6805] ? lock_is_held_type+0xb0/0xe0 [ 58.125062][ T6805] ? nla_get_range_signed+0x520/0x520 [ 58.130449][ T6805] ? netlink_deliver_tap+0x146/0xb70 [ 58.135731][ T6805] ? apparmor_capable+0x1d8/0x460 [ 58.140744][ T6805] ? security_capable+0x8f/0xc0 [ 58.145668][ T6805] ? __nla_parse+0x3d/0x4a [ 58.150099][ T6805] nfnetlink_rcv+0x3af/0x420 [ 58.154685][ T6805] ? nfnetlink_rcv_batch+0x1de0/0x1de0 [ 58.160143][ T6805] netlink_unicast+0x533/0x7d0 [ 58.164906][ T6805] ? netlink_attachskb+0x810/0x810 [ 58.170003][ T6805] ? _copy_from_iter_full+0x247/0x890 [ 58.175358][ T6805] ? __phys_addr+0x9a/0x110 [ 58.179854][ T6805] ? __phys_addr_symbol+0x2c/0x70 [ 58.184872][ T6805] ? __check_object_size+0x171/0x3e4 [ 58.190328][ T6805] netlink_sendmsg+0x856/0xd90 [ 58.195076][ T6805] ? netlink_unicast+0x7d0/0x7d0 [ 58.200541][ T6805] ? netlink_unicast+0x7d0/0x7d0 [ 58.205472][ T6805] sock_sendmsg+0xcf/0x120 [ 58.209883][ T6805] ____sys_sendmsg+0x6e8/0x810 [ 58.214649][ T6805] ? kernel_sendmsg+0x50/0x50 [ 58.219324][ T6805] ? do_recvmmsg+0x6d0/0x6d0 [ 58.223906][ T6805] ? lock_acquire+0x1f1/0xad0 [ 58.228597][ T6805] ? do_huge_pmd_anonymous_page+0x120d/0x2230 [ 58.236015][ T6805] ___sys_sendmsg+0xf3/0x170 [ 58.240616][ T6805] ? sendmsg_copy_msghdr+0x160/0x160 [ 58.246621][ T6805] ? do_huge_pmd_anonymous_page+0x1b94/0x2230 [ 58.252682][ T6805] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 58.258666][ T6805] ? do_huge_pmd_anonymous_page+0x8ef/0x2230 [ 58.264644][ T6805] ? handle_mm_fault+0xad9/0x43f0 [ 58.269681][ T6805] ? __fget_light+0x215/0x280 [ 58.274374][ T6805] __sys_sendmsg+0xe5/0x1b0 [ 58.282639][ T6805] ? __sys_sendmsg_sock+0xb0/0xb0 [ 58.288381][ T6805] ? vmacache_update+0xce/0x140 [ 58.293239][ T6805] ? lock_is_held_type+0xb0/0xe0 [ 58.298685][ T6805] ? do_fast_syscall_32+0x40/0x120 [ 58.303780][ T6805] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 58.309851][ T6805] do_syscall_32_irqs_on+0x3f/0x60 [ 58.314961][ T6805] do_fast_syscall_32+0x7f/0x120 [ 58.319883][ T6805] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 58.326824][ T6805] RIP: 0023:0xf7ffb569 [ 58.330994][ T6805] Code: Bad RIP value. [ 58.335052][ T6805] RSP: 002b:00000000ffc7a17c EFLAGS: 00000202 ORIG_RAX: 0000000000000172 [ 58.343461][ T6805] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000002000c2c0 [ 58.351436][ T6805] RDX: 0000000000000000 RSI: 00000000080eb078 RDI: 00000000ffc7a1d0 [ 58.359756][ T6805] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 58.368183][ T6805] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 58.376143][ T6805] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 58.385454][ T6805] Kernel Offset: disabled [ 58.390128][ T6805] Rebooting in 86400 seconds..