[ 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 '10.128.0.166' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 36.468715] audit: type=1400 audit(1593625703.581:8): avc: denied { execmem } for pid=6433 comm="syz-executor801" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 36.469714] kasan: CONFIG_KASAN_INLINE enabled [ 36.494735] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 36.502170] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 36.508386] CPU: 1 PID: 6433 Comm: syz-executor801 Not tainted 4.19.131-syzkaller #0 [ 36.516238] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.525578] RIP: 0010:nf_nat_setup_info+0x2f6/0x1f20 [ 36.530700] Code: c1 ea 03 80 3c 02 00 0f 85 60 19 00 00 4a 8b 04 e5 60 7c ae 89 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 2c 19 00 00 48 8b 03 48 89 85 48 fe ff ff e8 f1 [ 36.549575] RSP: 0018:ffff8880a64beed0 EFLAGS: 00010206 [ 36.554914] RAX: dffffc0000000000 RBX: 0000030000000002 RCX: ffffffff85ea841d [ 36.562159] RDX: 0000006000000000 RSI: ffffffff85ea7907 RDI: ffffffff89ae82a0 [ 36.569402] RBP: ffff8880a64bf0b0 R08: 0000000000000000 R09: 0000000000000000 [ 36.576646] R10: 0000000000000005 R11: 0000000000000000 R12: 00000000000000c8 [ 36.583929] R13: ffff8880a64bef70 R14: ffff888091791000 R15: 0000000000000000 [ 36.591175] FS: 0000000000907880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 36.599476] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.605349] CR2: 0000000020000300 CR3: 00000000a4ef8000 CR4: 00000000001406e0 [ 36.612608] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.619956] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.627201] Call Trace: [ 36.629767] ? lock_acquire+0x170/0x3c0 [ 36.633716] ? __bpf_address_lookup+0x330/0x330 [ 36.638384] ? check_preemption_disabled+0x41/0x280 [ 36.643382] ? nf_nat_cleanup_conntrack+0x1c0/0x1c0 [ 36.648388] ? mark_held_locks+0xa6/0xf0 [ 36.652424] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 36.657625] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 36.662182] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 36.667296] ? depot_save_stack+0x258/0x40a [ 36.671596] ? kasan_kmalloc+0x139/0x160 [ 36.675633] __nf_nat_alloc_null_binding+0x164/0x1d0 [ 36.680711] ? nf_nat_setup_info+0x1f20/0x1f20 [ 36.685270] nfnetlink_parse_nat_setup+0x53a/0x640 [ 36.690172] ? mark_held_locks+0xf0/0xf0 [ 36.694207] ? nf_nat_inet_fn+0xb00/0xb00 [ 36.698331] ? lock_downgrade+0x720/0x720 [ 36.702455] ? lock_acquire+0x170/0x3c0 [ 36.706404] ? cache_alloc_refill+0x95/0x340 [ 36.710788] ? check_preemption_disabled+0x41/0x280 [ 36.715781] ? __nf_conntrack_alloc+0xda/0x5e0 [ 36.720344] ? check_preemption_disabled+0x41/0x280 [ 36.725336] ctnetlink_parse_nat_setup+0xb6/0x640 [ 36.730159] ctnetlink_create_conntrack+0x4bb/0x12c0 [ 36.735237] ? ctnetlink_change_synproxy.isra.0+0x380/0x380 [ 36.740958] ? hash_conntrack_raw+0x2d6/0x460 [ 36.745433] ? nf_ct_get_tuplepr+0x310/0x310 [ 36.749816] ? nf_ct_gc_expired+0x300/0x300 [ 36.754111] ? nfnetlink_rcv_msg+0x98d/0xf60 [ 36.758537] ctnetlink_new_conntrack+0x4f3/0xde0 [ 36.763269] ? ctnetlink_create_conntrack+0x12c0/0x12c0 [ 36.768606] ? nfnetlink_rcv_msg+0x98d/0xf60 [ 36.772998] ? nfnetlink_rcv_msg+0x95a/0xf60 [ 36.777382] ? ctnetlink_create_conntrack+0x12c0/0x12c0 [ 36.782720] nfnetlink_rcv_msg+0xc4f/0xf60 [ 36.786933] ? nfnetlink_net_exit_batch+0x150/0x150 [ 36.791965] ? __lock_acquire+0x6de/0x3ff0 [ 36.796173] ? cred_has_capability.isra.0+0x139/0x2b0 [ 36.801338] ? cred_has_capability.isra.0+0x1b0/0x2b0 [ 36.806504] ? check_nnp_nosuid.isra.0+0x2a0/0x2a0 [ 36.811403] ? check_nnp_nosuid.isra.0+0x2a0/0x2a0 [ 36.816304] netlink_rcv_skb+0x160/0x440 [ 36.820382] ? nfnetlink_net_exit_batch+0x150/0x150 [ 36.825371] ? netlink_ack+0xae0/0xae0 [ 36.829233] ? ns_capable+0xde/0x100 [ 36.832934] nfnetlink_rcv+0x1b2/0x41b [ 36.836794] ? nfnetlink_rcv_batch+0x1df0/0x1df0 [ 36.841521] netlink_unicast+0x4d5/0x690 [ 36.845573] ? netlink_sendskb+0x110/0x110 [ 36.849782] netlink_sendmsg+0x6bb/0xc40 [ 36.853818] ? nlmsg_notify+0x1a0/0x1a0 [ 36.857766] ? kernel_recvmsg+0x220/0x220 [ 36.861886] ? nlmsg_notify+0x1a0/0x1a0 [ 36.865831] sock_sendmsg+0xc3/0x120 [ 36.869516] ___sys_sendmsg+0x7bb/0x8e0 [ 36.873496] ? copy_msghdr_from_user+0x440/0x440 [ 36.878225] ? do_huge_pmd_anonymous_page+0x939/0x1cc0 [ 36.883479] ? prep_transhuge_page+0xa0/0xa0 [ 36.887880] ? check_preemption_disabled+0x41/0x280 [ 36.892867] ? mark_held_locks+0xf0/0xf0 [ 36.896918] ? __handle_mm_fault+0xf34/0x41c0 [ 36.901385] ? errseq_sample+0x56/0x70 [ 36.905251] ? vm_insert_page+0x9c0/0x9c0 [ 36.909380] ? __do_page_fault+0x71b/0xde0 [ 36.913592] ? __fdget+0x1a0/0x230 [ 36.917108] __x64_sys_sendmsg+0x132/0x220 [ 36.921315] ? __sys_sendmsg+0x1b0/0x1b0 [ 36.925356] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 36.930090] ? trace_hardirqs_off_caller+0x69/0x210 [ 36.935078] ? do_syscall_64+0x21/0x620 [ 36.939047] do_syscall_64+0xf9/0x620 [ 36.942840] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.948007] RIP: 0033:0x4402b9 [ 36.951178] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 36.970053] RSP: 002b:00007ffc61abc4b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 36.977734] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402b9 [ 36.984975] RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 [ 36.992217] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 36.999472] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b40 [ 37.006716] R13: 0000000000401bd0 R14: 0000000000000000 R15: 0000000000000000 [ 37.013960] Modules linked in: [ 37.017674] ---[ end trace a781491dfd73b47c ]--- [ 37.022439] RIP: 0010:nf_nat_setup_info+0x2f6/0x1f20 [ 37.027571] Code: c1 ea 03 80 3c 02 00 0f 85 60 19 00 00 4a 8b 04 e5 60 7c ae 89 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 2c 19 00 00 48 8b 03 48 89 85 48 fe ff ff e8 f1 [ 37.046503] RSP: 0018:ffff8880a64beed0 EFLAGS: 00010206 [ 37.051864] RAX: dffffc0000000000 RBX: 0000030000000002 RCX: ffffffff85ea841d [ 37.059153] RDX: 0000006000000000 RSI: ffffffff85ea7907 RDI: ffffffff89ae82a0 [ 37.066489] RBP: ffff8880a64bf0b0 R08: 0000000000000000 R09: 0000000000000000 [ 37.073741] R10: 0000000000000005 R11: 0000000000000000 R12: 00000000000000c8 [ 37.081036] R13: ffff8880a64bef70 R14: ffff888091791000 R15: 0000000000000000 [ 37.088346] FS: 0000000000907880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 37.096586] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.102454] CR2: 0000000020000300 CR3: 00000000a4ef8000 CR4: 00000000001406e0 [ 37.109758] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.117050] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.124307] Kernel panic - not syncing: Fatal exception [ 37.130927] Kernel Offset: disabled [ 37.134544] Rebooting in 86400 seconds..