[ OK ] Started Daily apt upgrade and clean activities. [ OK ] Reached target Timers. Starting Permit User Sessions... [ OK ] Started Regular background program processing daemon. Starting System Logging Service... [ OK ] Started Permit User Sessions. [ OK ] Started System Logging Service. [ OK ] Found device /dev/ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.192' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 60.346179][ T28] audit: type=1400 audit(1594550888.278:8): avc: denied { execmem } for pid=6827 comm="syz-executor622" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 60.348617][ T6827] ------------[ cut here ]------------ [ 60.374203][ T6827] hook not found, pf 2 num 0 [ 60.374547][ T6827] WARNING: CPU: 1 PID: 6827 at net/netfilter/core.c:413 __nf_unregister_net_hook+0x1eb/0x500 [ 60.389549][ T6827] Kernel panic - not syncing: panic_on_warn set ... [ 60.396125][ T6827] CPU: 1 PID: 6827 Comm: syz-executor622 Not tainted 5.8.0-rc4-syzkaller #0 [ 60.404769][ T6827] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.414797][ T6827] Call Trace: [ 60.418069][ T6827] dump_stack+0x18f/0x20d [ 60.422378][ T6827] panic+0x2e3/0x75c [ 60.426251][ T6827] ? __warn_printk+0xf3/0xf3 [ 60.430827][ T6827] ? __warn.cold+0x5/0x45 [ 60.435131][ T6827] ? __warn+0xd6/0x1f2 [ 60.439187][ T6827] ? __nf_unregister_net_hook+0x1eb/0x500 [ 60.444881][ T6827] __warn.cold+0x20/0x45 [ 60.449114][ T6827] ? __nf_unregister_net_hook+0x1eb/0x500 [ 60.454867][ T6827] report_bug+0x1bd/0x210 [ 60.459185][ T6827] handle_bug+0x38/0x90 [ 60.463323][ T6827] ? __warn_printk+0xc6/0xf3 [ 60.467891][ T6827] exc_invalid_op+0x13/0x40 [ 60.472369][ T6827] asm_exc_invalid_op+0x12/0x20 [ 60.477196][ T6827] RIP: 0010:__nf_unregister_net_hook+0x1eb/0x500 [ 60.483501][ T6827] 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 [ 60.503117][ T6827] RSP: 0018:ffffc900015f73e0 EFLAGS: 00010286 [ 60.509171][ T6827] RAX: 0000000000000000 RBX: ffff88809f965a00 RCX: 0000000000000000 [ 60.517119][ T6827] RDX: ffff88808dfa83c0 RSI: ffffffff815d4f87 RDI: fffff520002bee6e [ 60.525064][ T6827] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 [ 60.533016][ T6827] R10: 000000000000061b R11: 0000000000000000 R12: ffffffff8a7a8048 [ 60.540979][ T6827] R13: 0000000000000000 R14: ffff8880a8586f00 R15: 0000000000000005 [ 60.548946][ T6827] ? vprintk_func+0x97/0x1a6 [ 60.553529][ T6827] nf_unregister_net_hook+0x59/0xa0 [ 60.558704][ T6827] nft_table_disable+0xb3/0x2d0 [ 60.563540][ T6827] nf_tables_commit+0x2dcf/0x4155 [ 60.568546][ T6827] ? nf_tables_setelem_notify.constprop.0+0x1e0/0x1e0 [ 60.575286][ T6827] ? __nla_parse+0x3d/0x4a [ 60.579696][ T6827] nfnetlink_rcv_batch+0xb2c/0x1de0 [ 60.584957][ T6827] ? __nf_tables_abort+0x2421/0x2f50 [ 60.590218][ T6827] ? nfnetlink_bind+0x2b0/0x2b0 [ 60.595054][ T6827] ? lock_is_held_type+0xb0/0xe0 [ 60.599983][ T6827] ? nla_get_range_signed+0x520/0x520 [ 60.605336][ T6827] ? netlink_deliver_tap+0x146/0xb70 [ 60.610595][ T6827] ? cap_capable+0x1eb/0x250 [ 60.615156][ T6827] ? security_capable+0x8f/0xc0 [ 60.619980][ T6827] ? __nla_parse+0x3d/0x4a [ 60.624373][ T6827] nfnetlink_rcv+0x3af/0x420 [ 60.628938][ T6827] ? nfnetlink_rcv_batch+0x1de0/0x1de0 [ 60.634373][ T6827] netlink_unicast+0x533/0x7d0 [ 60.639111][ T6827] ? netlink_attachskb+0x810/0x810 [ 60.644196][ T6827] ? _copy_from_iter_full+0x247/0x890 [ 60.649547][ T6827] netlink_sendmsg+0x856/0xd90 [ 60.654286][ T6827] ? netlink_unicast+0x7d0/0x7d0 [ 60.659202][ T6827] ? netlink_unicast+0x7d0/0x7d0 [ 60.664114][ T6827] sock_sendmsg+0xcf/0x120 [ 60.668505][ T6827] ____sys_sendmsg+0x6e8/0x810 [ 60.673254][ T6827] ? kernel_sendmsg+0x50/0x50 [ 60.677918][ T6827] ? do_recvmmsg+0x6d0/0x6d0 [ 60.682501][ T6827] ? lock_acquire+0x1f1/0xad0 [ 60.687156][ T6827] ? do_huge_pmd_anonymous_page+0x120d/0x2230 [ 60.693715][ T6827] ? find_held_lock+0x2d/0x110 [ 60.698460][ T6827] ___sys_sendmsg+0xf3/0x170 [ 60.703023][ T6827] ? sendmsg_copy_msghdr+0x160/0x160 [ 60.708284][ T6827] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 60.714238][ T6827] ? do_huge_pmd_anonymous_page+0x8ef/0x2230 [ 60.720196][ T6827] ? handle_mm_fault+0xad9/0x43f0 [ 60.725194][ T6827] ? find_held_lock+0x2d/0x110 [ 60.729940][ T6827] ? __fget_light+0x215/0x280 [ 60.734594][ T6827] __sys_sendmsg+0xe5/0x1b0 [ 60.739085][ T6827] ? __sys_sendmsg_sock+0xb0/0xb0 [ 60.744091][ T6827] ? do_syscall_64+0x1c/0xe0 [ 60.748657][ T6827] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 60.754622][ T6827] do_syscall_64+0x60/0xe0 [ 60.759022][ T6827] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 60.764914][ T6827] RIP: 0033:0x440709 [ 60.768777][ T6827] Code: Bad RIP value. [ 60.772813][ T6827] RSP: 002b:00007ffc0b233cb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 60.781193][ T6827] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440709 [ 60.789140][ T6827] RDX: 0000000000000000 RSI: 000000002000c2c0 RDI: 0000000000000003 [ 60.797106][ T6827] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 60.805063][ T6827] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000401f10 [ 60.813068][ T6827] R13: 0000000000401fa0 R14: 0000000000000000 R15: 0000000000000000 [ 60.822259][ T6827] Kernel Offset: disabled [ 60.826702][ T6827] Rebooting in 86400 seconds..