[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.223' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 41.167902] kasan: CONFIG_KASAN_INLINE enabled [ 41.173366] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 41.180983] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 41.187228] CPU: 0 PID: 6440 Comm: syz-executor490 Not tainted 4.19.115-syzkaller #0 [ 41.195961] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.205573] RIP: 0010:get_unique_tuple+0x27a/0x1d50 [ 41.210575] Code: c1 e9 03 80 3c 11 00 0f 85 cd 17 00 00 4a 8b 14 e5 60 10 8e 89 4c 8d 24 c2 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 99 17 00 00 49 8b 04 24 48 89 85 08 ff ff ff e8 [ 41.230473] RSP: 0018:ffff888089956e18 EFLAGS: 00010246 [ 41.235878] RAX: dffffc0000000000 RBX: ffff888089956fc0 RCX: 1ffffffff131c2dd [ 41.243145] RDX: 0000000000000000 RSI: ffffffff85d2a977 RDI: ffffffff898e16e8 [ 41.250410] RBP: ffff888089956f70 R08: ffff8880a6674040 R09: ffffed1015cc4733 [ 41.257693] R10: ffffed1015cc4732 R11: ffff8880ae623993 R12: 0000000000000000 [ 41.264953] R13: 0000000000000001 R14: ffff888089957010 R15: ffff88809fbf7680 [ 41.272229] FS: 000000000081e880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 41.280455] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.286322] CR2: 0000000020000280 CR3: 000000009222d000 CR4: 00000000001406f0 [ 41.293580] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.300832] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.308952] Call Trace: [ 41.311526] ? find_held_lock+0x2d/0x110 [ 41.315572] ? nf_ct_invert_tuplepr+0x118/0x1f0 [ 41.320242] ? hash_by_src+0x3a0/0x3a0 [ 41.324128] ? lock_downgrade+0x740/0x740 [ 41.329232] ? check_preemption_disabled+0x41/0x280 [ 41.334253] nf_nat_setup_info+0x1c3/0x840 [ 41.338478] ? nf_nat_proto_clean+0x1f0/0x1f0 [ 41.342961] ? _raw_spin_unlock_irqrestore+0xa0/0xe0 [ 41.348922] ? save_stack+0x89/0xa0 [ 41.352533] ? kasan_kmalloc+0xbf/0xe0 [ 41.356612] ? kmem_cache_alloc+0x127/0x710 [ 41.360934] ? __nf_conntrack_alloc+0xd6/0x670 [ 41.365507] ? ctnetlink_create_conntrack+0xb1/0x1280 [ 41.370692] ? ctnetlink_new_conntrack+0x4f5/0xde0 [ 41.375604] ? nfnetlink_rcv_msg+0xc9e/0xf4b [ 41.379996] ? netlink_rcv_skb+0x160/0x410 [ 41.384224] ? nfnetlink_rcv+0x1b2/0x420 [ 41.388879] ? netlink_unicast+0x4d7/0x6a0 [ 41.393114] ? netlink_sendmsg+0x80b/0xcd0 [ 41.397335] ? sock_sendmsg+0xcf/0x120 [ 41.401201] ? ___sys_sendmsg+0x803/0x920 [ 41.405417] ? __sys_sendmsg+0xec/0x1b0 [ 41.409724] ? do_syscall_64+0xf9/0x620 [ 41.413868] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.420187] __nf_nat_alloc_null_binding+0x164/0x1d0 [ 41.425280] ? nf_nat_setup_info+0x840/0x840 [ 41.429677] ? mark_held_locks+0xf0/0xf0 [ 41.433722] ? __lock_is_held+0xad/0x140 [ 41.437783] nfnetlink_parse_nat_setup+0x38f/0x410 [ 41.442704] ? nf_nat_inet_fn+0x8c0/0x8c0 [ 41.446835] ? __nf_conntrack_alloc+0xd6/0x670 [ 41.451500] ? __lock_is_held+0xad/0x140 [ 41.455545] ctnetlink_parse_nat_setup+0xb6/0x640 [ 41.460531] ctnetlink_create_conntrack+0x4b7/0x1280 [ 41.465772] ? ctnetlink_dump_table+0x11e0/0x11e0 [ 41.470718] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 41.475907] ? hash_conntrack_raw+0x2d3/0x450 [ 41.480395] ? nf_ct_unconfirmed_destroy+0xa0/0xa0 [ 41.485328] ? __nf_conntrack_confirm+0x2fc0/0x2fc0 [ 41.490349] ctnetlink_new_conntrack+0x4f5/0xde0 [ 41.495100] ? ctnetlink_create_conntrack+0x1280/0x1280 [ 41.500450] ? mutex_trylock+0x1a0/0x1a0 [ 41.504503] ? __lock_is_held+0xad/0x140 [ 41.508552] ? check_preemption_disabled+0x41/0x280 [ 41.513554] ? ctnetlink_create_conntrack+0x1280/0x1280 [ 41.518908] nfnetlink_rcv_msg+0xc9e/0xf4b [ 41.523154] ? nfnetlink_bind+0x2b0/0x2b0 [ 41.527331] ? __lock_acquire+0x6ee/0x49c0 [ 41.531560] ? __alloc_skb+0xef/0x5b0 [ 41.535523] ? cred_has_capability+0x162/0x2e0 [ 41.540207] ? cred_has_capability+0x16d/0x2e0 [ 41.544780] ? selinux_ipv4_output+0x50/0x50 [ 41.549959] ? selinux_ipv4_output+0x50/0x50 [ 41.554368] netlink_rcv_skb+0x160/0x410 [ 41.558414] ? nfnetlink_bind+0x2b0/0x2b0 [ 41.562559] ? netlink_ack+0xa60/0xa60 [ 41.566437] ? ns_capable_common+0xe2/0x100 [ 41.570761] nfnetlink_rcv+0x1b2/0x420 [ 41.575001] ? nfnetlink_rcv_batch+0x15e0/0x15e0 [ 41.579765] netlink_unicast+0x4d7/0x6a0 [ 41.583819] ? netlink_attachskb+0x710/0x710 [ 41.588215] netlink_sendmsg+0x80b/0xcd0 [ 41.592263] ? netlink_unicast+0x6a0/0x6a0 [ 41.596481] ? move_addr_to_kernel.part.0+0x110/0x110 [ 41.601660] ? netlink_unicast+0x6a0/0x6a0 [ 41.606012] sock_sendmsg+0xcf/0x120 [ 41.609851] ___sys_sendmsg+0x803/0x920 [ 41.614248] ? copy_msghdr_from_user+0x410/0x410 [ 41.619006] ? rcu_read_lock_sched_held+0x10a/0x130 [ 41.624092] ? kmem_cache_alloc+0x31b/0x710 [ 41.628415] ? percpu_counter_add_batch+0x123/0x180 [ 41.634304] ? alloc_empty_file+0xd7/0x170 [ 41.638647] ? find_held_lock+0x2d/0x110 [ 41.642711] ? __fd_install+0x1b4/0x610 [ 41.646668] ? __fget_light+0x1a2/0x230 [ 41.650690] __sys_sendmsg+0xec/0x1b0 [ 41.654471] ? __ia32_sys_shutdown+0x70/0x70 [ 41.658865] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 41.663616] ? trace_hardirqs_off_caller+0x55/0x210 [ 41.668613] ? do_syscall_64+0x21/0x620 [ 41.672572] do_syscall_64+0xf9/0x620 [ 41.676388] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.682523] RIP: 0033:0x440239 [ 41.685707] 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 [ 41.704593] RSP: 002b:00007ffed10cad28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 41.712287] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440239 [ 41.719537] RDX: 0000000000000000 RSI: 0000000020000640 RDI: 0000000000000003 [ 41.726803] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 41.734855] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401ac0 [ 41.742540] R13: 0000000000401b50 R14: 0000000000000000 R15: 0000000000000000 [ 41.750765] Modules linked in: [ 41.754239] ---[ end trace 35711f42054ef681 ]--- [ 41.759059] RIP: 0010:get_unique_tuple+0x27a/0x1d50 [ 41.764081] Code: c1 e9 03 80 3c 11 00 0f 85 cd 17 00 00 4a 8b 14 e5 60 10 8e 89 4c 8d 24 c2 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 99 17 00 00 49 8b 04 24 48 89 85 08 ff ff ff e8 [ 41.787259] RSP: 0018:ffff888089956e18 EFLAGS: 00010246 [ 41.795731] RAX: dffffc0000000000 RBX: ffff888089956fc0 RCX: 1ffffffff131c2dd [ 41.803080] RDX: 0000000000000000 RSI: ffffffff85d2a977 RDI: ffffffff898e16e8 [ 41.810400] RBP: ffff888089956f70 R08: ffff8880a6674040 R09: ffffed1015cc4733 [ 41.817843] R10: ffffed1015cc4732 R11: ffff8880ae623993 R12: 0000000000000000 [ 41.825123] R13: 0000000000000001 R14: ffff888089957010 R15: ffff88809fbf7680 [ 41.832470] FS: 000000000081e880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 41.840748] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.847711] CR2: 0000559af9bb36e0 CR3: 000000009222d000 CR4: 00000000001406f0 [ 41.855006] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.862337] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.870097] Kernel panic - not syncing: Fatal exception [ 41.876760] Kernel Offset: disabled [ 41.880398] Rebooting in 86400 seconds..