[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.180' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.186530] audit: type=1400 audit(1595935768.255:8): avc: denied { execmem } for pid=6327 comm="syz-executor516" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 31.206502] kasan: CONFIG_KASAN_INLINE enabled [ 31.211693] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 31.219132] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.225392] Modules linked in: [ 31.228561] CPU: 1 PID: 6327 Comm: syz-executor516 Not tainted 4.14.189-syzkaller #0 [ 31.236412] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.245744] task: ffff8880862fc340 task.stack: ffff888084560000 [ 31.251777] RIP: 0010:nf_nat_setup_info+0x28c/0x1a80 [ 31.256848] RSP: 0018:ffff888084566fa8 EFLAGS: 00010246 [ 31.262185] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 31.269427] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff88934170 [ 31.276668] RBP: ffff888084567168 R08: ffffffff85388e2a R09: 0000000000020012 [ 31.283908] R10: ffff8880862fcc18 R11: ffff8880862fc340 R12: ffff888084567048 [ 31.291150] R13: 0000000000000012 R14: 0000000000000000 R15: ffff88808f3c7dc0 [ 31.298392] FS: 000000000150f880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 [ 31.306588] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.312447] CR2: 00007f3c578dd6c0 CR3: 0000000087f8e000 CR4: 00000000001406e0 [ 31.319690] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.326931] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.334173] Call Trace: [ 31.336739] ? nf_nat_cleanup_conntrack+0x1b0/0x1b0 [ 31.341732] ? depot_save_stack+0x1d3/0x3e3 [ 31.346026] ? kasan_kmalloc+0x139/0x160 [ 31.350060] ? kasan_kmalloc+0xeb/0x160 [ 31.354004] ? kmem_cache_alloc+0x124/0x3c0 [ 31.358297] ? __nf_conntrack_alloc+0xa2/0x550 [ 31.362850] ? ctnetlink_create_conntrack+0x9e/0x1050 [ 31.368011] ? ctnetlink_new_conntrack+0x457/0xbf0 [ 31.372911] ? nfnetlink_rcv_msg+0x9bb/0xc00 [ 31.377287] ? netlink_rcv_skb+0x125/0x390 [ 31.381490] ? nfnetlink_rcv+0x1ab/0x1da0 [ 31.385607] ? netlink_unicast+0x437/0x610 [ 31.389813] ? ctnetlink_create_conntrack+0x166/0x1050 [ 31.395062] __nf_nat_alloc_null_binding+0x13f/0x180 [ 31.400135] ? nf_nat_setup_info+0x1a80/0x1a80 [ 31.404689] nfnetlink_parse_nat_setup+0x483/0x560 [ 31.409587] ? nf_nat_alloc_null_binding+0x40/0x40 [ 31.414487] ? lock_downgrade+0x740/0x740 [ 31.418608] ? __nf_conntrack_alloc+0xa2/0x550 [ 31.423215] ? check_preemption_disabled+0x35/0x240 [ 31.428241] ? wimax_dev_add+0x2a0/0x640 [ 31.432275] ? nf_nat_alloc_null_binding+0x40/0x40 [ 31.437175] ctnetlink_parse_nat_setup+0x70/0x490 [ 31.441989] ctnetlink_create_conntrack+0x43b/0x1050 [ 31.447110] ? ctnetlink_glue_parse+0x440/0x440 [ 31.451755] ? nf_ct_invert_tuplepr+0x2b0/0x2b0 [ 31.456395] ctnetlink_new_conntrack+0x457/0xbf0 [ 31.461121] ? ctnetlink_create_conntrack+0x1050/0x1050 [ 31.466459] ? ctnetlink_create_conntrack+0x1050/0x1050 [ 31.471791] nfnetlink_rcv_msg+0x9bb/0xc00 [ 31.476003] ? lock_downgrade+0x740/0x740 [ 31.480129] netlink_rcv_skb+0x125/0x390 [ 31.484161] ? nfnetlink_net_exit_batch+0x150/0x150 [ 31.489150] ? netlink_ack+0x9a0/0x9a0 [ 31.493009] ? ns_capable_common+0x127/0x150 [ 31.497388] nfnetlink_rcv+0x1ab/0x1da0 [ 31.501334] ? do_syscall_64+0x1d5/0x640 [ 31.505368] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 31.510711] ? trace_hardirqs_on+0x10/0x10 [ 31.514917] ? __netlink_lookup+0x345/0x5d0 [ 31.519211] ? lock_downgrade+0x740/0x740 [ 31.523328] ? nfnetlink_bind+0x240/0x240 [ 31.527448] ? netlink_table_grab.part.0+0x1f0/0x1f0 [ 31.532526] ? netlink_deliver_tap+0x90/0x7d0 [ 31.536991] ? lock_downgrade+0x740/0x740 [ 31.541109] netlink_unicast+0x437/0x610 [ 31.545141] ? netlink_sendskb+0xd0/0xd0 [ 31.549172] netlink_sendmsg+0x62e/0xb80 [ 31.553218] ? nlmsg_notify+0x170/0x170 [ 31.557161] ? kernel_recvmsg+0x210/0x210 [ 31.561292] ? security_socket_sendmsg+0x83/0xb0 [ 31.566017] ? nlmsg_notify+0x170/0x170 [ 31.569965] sock_sendmsg+0xb5/0x100 [ 31.573648] ___sys_sendmsg+0x6c8/0x800 [ 31.577593] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 31.582317] ? trace_hardirqs_on+0x10/0x10 [ 31.586542] ? trace_hardirqs_on+0x10/0x10 [ 31.590750] ? trace_hardirqs_on+0x10/0x10 [ 31.594953] ? fs_reclaim_release+0xd0/0x110 [ 31.599335] ? wimax_dev_add+0x2a0/0x640 [ 31.603366] ? selinux_file_alloc_security+0xaf/0x190 [ 31.608525] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 31.613946] ? __fd_install+0x1ec/0x5c0 [ 31.617891] ? lock_acquire+0x170/0x3f0 [ 31.621836] ? lock_downgrade+0x740/0x740 [ 31.625955] ? __fdget+0x167/0x1f0 [ 31.629469] ? sockfd_lookup_light+0xb2/0x160 [ 31.633935] __sys_sendmsg+0xa3/0x120 [ 31.637708] ? SyS_shutdown+0x160/0x160 [ 31.641653] ? move_addr_to_kernel+0x60/0x60 [ 31.646032] ? __do_page_fault+0x19a/0xb50 [ 31.650236] SyS_sendmsg+0x27/0x40 [ 31.653745] ? __sys_sendmsg+0x120/0x120 [ 31.657781] do_syscall_64+0x1d5/0x640 [ 31.661639] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 31.666798] RIP: 0033:0x440309 [ 31.669960] RSP: 002b:00007ffc49f26af8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 31.677638] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 31.684879] RDX: 0000000000000000 RSI: 0000000020000580 RDI: 0000000000000003 [ 31.692119] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 31.699375] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b10 [ 31.706618] R13: 0000000000401ba0 R14: 0000000000000000 R15: 0000000000000000 [ 31.713873] Code: 48 c1 ea 03 80 3c 02 00 0f 85 cd 15 00 00 4a 8b 04 ed e0 40 93 88 48 8d 1c d8 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 ca 15 00 00 48 8b 03 48 89 85 78 fe ff ff e8 [ 31.732933] RIP: nf_nat_setup_info+0x28c/0x1a80 RSP: ffff888084566fa8 [ 31.739797] ---[ end trace 5a12a273a189249a ]--- [ 31.744539] Kernel panic - not syncing: Fatal exception [ 31.751105] Kernel Offset: disabled [ 31.754720] Rebooting in 86400 seconds..