[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.21' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.302512] audit: type=1400 audit(1597529211.270:8): avc: denied { execmem } for pid=6359 comm="syz-executor276" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 34.334909] kasan: CONFIG_KASAN_INLINE enabled [ 34.339611] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 34.348022] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 34.354263] Modules linked in: [ 34.357437] CPU: 0 PID: 6359 Comm: syz-executor276 Not tainted 4.14.193-syzkaller #0 [ 34.365297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.374757] task: ffff8880a609c380 task.stack: ffff888081e60000 [ 34.380876] RIP: 0010:nfnetlink_parse_nat_setup+0x1df/0x560 [ 34.386671] RSP: 0018:ffff888081e67230 EFLAGS: 00010203 [ 34.392154] RAX: dffffc0000000000 RBX: ffff888081e672f0 RCX: 0000000000000000 [ 34.399431] RDX: 0000000000000007 RSI: 0000000000000000 RDI: 000000000000003e [ 34.406685] RBP: ffff88808e18adc0 R08: 0000000000000001 R09: ffff888081e672f0 [ 34.413958] R10: ffff888081e6731f R11: ffff8880a609c380 R12: 0000000000000000 [ 34.421836] R13: 0000000000000001 R14: 0000000000000006 R15: ffff888081e672a0 [ 34.429101] FS: 0000000000783880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 [ 34.437309] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.443170] CR2: 000055a186a902d0 CR3: 000000008a128000 CR4: 00000000001406f0 [ 34.450430] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.460906] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.468198] Call Trace: [ 34.470781] ? nf_nat_alloc_null_binding+0x40/0x40 [ 34.475704] ? lock_downgrade+0x740/0x740 [ 34.479843] ? __nf_conntrack_alloc+0xa2/0x550 [ 34.484525] ? nf_nat_alloc_null_binding+0x40/0x40 [ 34.489444] ctnetlink_parse_nat_setup+0x70/0x490 [ 34.494276] ctnetlink_create_conntrack+0x43b/0x1050 [ 34.499381] ? ctnetlink_glue_parse+0x440/0x440 [ 34.504037] ? nf_ct_invert_tuplepr+0x2b0/0x2b0 [ 34.510610] ctnetlink_new_conntrack+0x457/0xbf0 [ 34.515370] ? ctnetlink_create_conntrack+0x1050/0x1050 [ 34.520773] ? ctnetlink_create_conntrack+0x1050/0x1050 [ 34.526148] nfnetlink_rcv_msg+0x9bb/0xc00 [ 34.530400] ? lock_downgrade+0x740/0x740 [ 34.534580] netlink_rcv_skb+0x125/0x390 [ 34.538748] ? nfnetlink_net_exit_batch+0x150/0x150 [ 34.543763] ? netlink_ack+0x9a0/0x9a0 [ 34.547732] ? ns_capable_common+0x127/0x150 [ 34.552129] nfnetlink_rcv+0x1ab/0x1da0 [ 34.556089] ? do_syscall_64+0x1d5/0x640 [ 34.560133] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 34.565698] ? trace_hardirqs_on+0x10/0x10 [ 34.570081] ? __netlink_lookup+0x345/0x5d0 [ 34.574977] ? lock_downgrade+0x740/0x740 [ 34.579125] ? nfnetlink_bind+0x240/0x240 [ 34.583315] ? netlink_table_grab.part.0+0x1f0/0x1f0 [ 34.588680] ? netlink_deliver_tap+0x90/0x7d0 [ 34.593439] ? lock_downgrade+0x740/0x740 [ 34.598274] netlink_unicast+0x437/0x610 [ 34.602505] ? netlink_sendskb+0xd0/0xd0 [ 34.606554] netlink_sendmsg+0x62e/0xb80 [ 34.610614] ? nlmsg_notify+0x170/0x170 [ 34.614582] ? kernel_recvmsg+0x210/0x210 [ 34.618743] ? security_socket_sendmsg+0x83/0xb0 [ 34.623488] ? nlmsg_notify+0x170/0x170 [ 34.627492] sock_sendmsg+0xb5/0x100 [ 34.631214] ___sys_sendmsg+0x6c8/0x800 [ 34.635179] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 34.639923] ? lock_downgrade+0x740/0x740 [ 34.644058] ? do_raw_spin_unlock+0x164/0x220 [ 34.648572] ? _raw_spin_unlock+0x29/0x40 [ 34.652721] ? do_huge_pmd_anonymous_page+0x732/0x1670 [ 34.657985] ? prep_transhuge_page+0xa0/0xa0 [ 34.663266] ? __handle_mm_fault+0x80f/0x4620 [ 34.667764] ? vm_insert_page+0x7c0/0x7c0 [ 34.671921] ? __fdget+0x167/0x1f0 [ 34.675446] ? sockfd_lookup_light+0xb2/0x160 [ 34.679921] __sys_sendmsg+0xa3/0x120 [ 34.683709] ? SyS_shutdown+0x160/0x160 [ 34.687670] ? up_read+0x17/0x30 [ 34.691032] ? __do_page_fault+0x19a/0xb50 [ 34.695260] SyS_sendmsg+0x27/0x40 [ 34.698814] ? __sys_sendmsg+0x120/0x120 [ 34.702864] do_syscall_64+0x1d5/0x640 [ 34.706764] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 34.711955] RIP: 0033:0x440359 [ 34.715135] RSP: 002b:00007fff3a038258 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 34.722831] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440359 [ 34.730098] RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 [ 34.737368] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 34.744634] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b60 [ 34.752759] R13: 0000000000401bf0 R14: 0000000000000000 R15: 0000000000000000 [ 34.760135] Code: df 83 e9 04 e8 23 f5 d9 fd 85 c0 0f 88 26 02 00 00 e8 26 ac 20 fc 49 8d 7e 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 28 03 00 00 4c 89 fe 48 89 df 41 ff 56 38 85 [ 34.779219] RIP: nfnetlink_parse_nat_setup+0x1df/0x560 RSP: ffff888081e67230 [ 34.787009] ---[ end trace b0a2f2ee09194c3b ]--- [ 34.791835] Kernel panic - not syncing: Fatal exception [ 34.798181] Kernel Offset: disabled [ 34.801797] Rebooting in 86400 seconds..