[ 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 '10.128.0.10' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.600807] audit: type=1400 audit(1597286153.538:8): avc: denied { execmem } for pid=6361 comm="syz-executor381" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 33.622334] kasan: CONFIG_KASAN_INLINE enabled [ 33.626990] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 33.635199] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.641480] Modules linked in: [ 33.644692] CPU: 1 PID: 6361 Comm: syz-executor381 Not tainted 4.14.193-syzkaller #0 [ 33.652541] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.661875] task: ffff888097cfe500 task.stack: ffff888097a58000 [ 33.667916] RIP: 0010:nf_nat_setup_info+0x28c/0x1a80 [ 33.672993] RSP: 0018:ffff888097a5efa8 EFLAGS: 00010246 [ 33.678334] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 33.685581] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff88939d20 [ 33.692826] RBP: ffff888097a5f168 R08: ffffffff853ace4a R09: 0000000000020012 [ 33.700072] R10: ffff888097cfedd8 R11: ffff888097cfe500 R12: ffff888097a5f048 [ 33.707327] R13: 0000000000000018 R14: 0000000000000000 R15: ffff8880a35f6dc0 [ 33.714593] FS: 0000000001ca5880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 [ 33.724091] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.729943] CR2: 00007f3d6a583000 CR3: 00000000a8a2c000 CR4: 00000000001406e0 [ 33.737185] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.744426] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.751669] Call Trace: [ 33.754253] ? nft_cmp_init+0x230/0x230 [ 33.758200] ? nf_nat_cleanup_conntrack+0x1b0/0x1b0 [ 33.763190] ? depot_save_stack+0x1d3/0x3e3 [ 33.767486] ? kasan_kmalloc+0x139/0x160 [ 33.771518] ? kasan_kmalloc+0xeb/0x160 [ 33.775462] ? kmem_cache_alloc+0x124/0x3c0 [ 33.779757] ? __nf_conntrack_alloc+0xa2/0x550 [ 33.784458] ? ctnetlink_create_conntrack+0x9e/0x1050 [ 33.789623] ? ctnetlink_new_conntrack+0x457/0xbf0 [ 33.794526] ? nfnetlink_rcv_msg+0x9bb/0xc00 [ 33.798905] ? netlink_rcv_skb+0x125/0x390 [ 33.803110] ? nfnetlink_rcv+0x1ab/0x1da0 [ 33.807227] ? netlink_unicast+0x437/0x610 [ 33.811457] ? ctnetlink_create_conntrack+0x166/0x1050 [ 33.816705] __nf_nat_alloc_null_binding+0x13f/0x180 [ 33.821781] ? nf_nat_setup_info+0x1a80/0x1a80 [ 33.826336] ? nft_cmp_init+0x230/0x230 [ 33.830280] ? nft_cmp_init+0x230/0x230 [ 33.834222] nfnetlink_parse_nat_setup+0x483/0x560 [ 33.839122] ? nf_nat_alloc_null_binding+0x40/0x40 [ 33.844023] ? lock_downgrade+0x740/0x740 [ 33.848144] ? __nf_conntrack_alloc+0xa2/0x550 [ 33.852700] ? check_preemption_disabled+0x35/0x240 [ 33.857688] ? nf_nat_alloc_null_binding+0x40/0x40 [ 33.862589] ctnetlink_parse_nat_setup+0x70/0x490 [ 33.867414] ctnetlink_create_conntrack+0x43b/0x1050 [ 33.872491] ? ctnetlink_glue_parse+0x440/0x440 [ 33.877131] ? nf_ct_invert_tuplepr+0x2b0/0x2b0 [ 33.881772] ctnetlink_new_conntrack+0x457/0xbf0 [ 33.886498] ? ctnetlink_create_conntrack+0x1050/0x1050 [ 33.891836] ? ctnetlink_create_conntrack+0x1050/0x1050 [ 33.897270] nfnetlink_rcv_msg+0x9bb/0xc00 [ 33.901482] ? lock_downgrade+0x740/0x740 [ 33.905603] netlink_rcv_skb+0x125/0x390 [ 33.909635] ? nfnetlink_net_exit_batch+0x150/0x150 [ 33.914622] ? netlink_ack+0x9a0/0x9a0 [ 33.918485] ? ns_capable_common+0x127/0x150 [ 33.922863] nfnetlink_rcv+0x1ab/0x1da0 [ 33.926807] ? do_syscall_64+0x1d5/0x640 [ 33.930840] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 33.936175] ? trace_hardirqs_on+0x10/0x10 [ 33.940381] ? __netlink_lookup+0x345/0x5d0 [ 33.944673] ? lock_downgrade+0x740/0x740 [ 33.948793] ? nfnetlink_bind+0x240/0x240 [ 33.952912] ? netlink_table_grab.part.0+0x1f0/0x1f0 [ 33.957993] ? netlink_deliver_tap+0x90/0x7d0 [ 33.962460] ? lock_downgrade+0x740/0x740 [ 33.966590] netlink_unicast+0x437/0x610 [ 33.970714] ? netlink_sendskb+0xd0/0xd0 [ 33.974758] netlink_sendmsg+0x62e/0xb80 [ 33.978789] ? nlmsg_notify+0x170/0x170 [ 33.982737] ? kernel_recvmsg+0x210/0x210 [ 33.986858] ? security_socket_sendmsg+0x83/0xb0 [ 33.991584] ? nlmsg_notify+0x170/0x170 [ 33.995538] sock_sendmsg+0xb5/0x100 [ 33.999225] ___sys_sendmsg+0x6c8/0x800 [ 34.003169] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 34.007895] ? lock_downgrade+0x740/0x740 [ 34.012012] ? do_raw_spin_unlock+0x164/0x220 [ 34.016478] ? _raw_spin_unlock+0x29/0x40 [ 34.020601] ? do_huge_pmd_anonymous_page+0x732/0x1670 [ 34.025849] ? prep_transhuge_page+0xa0/0xa0 [ 34.030231] ? __handle_mm_fault+0x80f/0x4620 [ 34.034699] ? vm_insert_page+0x7c0/0x7c0 [ 34.038819] ? __fdget+0x167/0x1f0 [ 34.043818] ? sockfd_lookup_light+0xb2/0x160 [ 34.048283] __sys_sendmsg+0xa3/0x120 [ 34.052053] ? SyS_shutdown+0x160/0x160 [ 34.055999] ? up_read+0x17/0x30 [ 34.059337] ? __do_page_fault+0x19a/0xb50 [ 34.063541] SyS_sendmsg+0x27/0x40 [ 34.067051] ? __sys_sendmsg+0x120/0x120 [ 34.071085] do_syscall_64+0x1d5/0x640 [ 34.074946] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 34.080106] RIP: 0033:0x440629 [ 34.083265] RSP: 002b:00007ffc8cb1bf58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 34.090955] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440629 [ 34.098195] RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 [ 34.105435] RBP: 00000000006ca018 R08: 0000000000000008 R09: 00000000004002c8 [ 34.112677] R10: 0000000000000014 R11: 0000000000000246 R12: 0000000000401e30 [ 34.119920] R13: 0000000000401ec0 R14: 0000000000000000 R15: 0000000000000000 [ 34.127161] Code: 48 c1 ea 03 80 3c 02 00 0f 85 cd 15 00 00 4a 8b 04 ed 60 9c 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 [ 34.146220] RIP: nf_nat_setup_info+0x28c/0x1a80 RSP: ffff888097a5efa8 [ 34.153107] ---[ end trace 814fe820b021f656 ]--- [ 34.157855] Kernel panic - not syncing: Fatal exception [ 34.164442] Kernel Offset: disabled [ 34.168051] Rebooting in 86400 seconds..