[ 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 '10.128.10.31' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.319715] audit: type=1400 audit(1597285610.897:8): avc: denied { execmem } for pid=6475 comm="syz-executor688" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 38.322070] kasan: CONFIG_KASAN_INLINE enabled [ 38.344393] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.351807] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.358047] CPU: 0 PID: 6475 Comm: syz-executor688 Not tainted 4.19.139-syzkaller #0 [ 38.365903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.375241] RIP: 0010:nf_nat_setup_info+0x2f6/0x1f20 [ 38.380322] Code: c1 ea 03 80 3c 02 00 0f 85 60 19 00 00 4a 8b 04 e5 60 53 af 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 [ 38.399202] RSP: 0018:ffff8880a50e6ed0 EFLAGS: 00010246 [ 38.404540] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85ee39cd [ 38.411899] RDX: 0000000000000000 RSI: ffffffff85ee2eb7 RDI: ffffffff89af5420 [ 38.419199] RBP: ffff8880a50e70b0 R08: 0000000000000000 R09: 0000000000000000 [ 38.426446] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000018 [ 38.433693] R13: ffff8880a50e6f70 R14: ffff8880a9443500 R15: 0000000000000000 [ 38.440944] FS: 0000000000975880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 38.449145] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.455004] CR2: 0000000020000606 CR3: 000000008dd49000 CR4: 00000000001406f0 [ 38.462283] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.469530] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.476884] Call Trace: [ 38.479455] ? lock_acquire+0x170/0x3c0 [ 38.483407] ? __bpf_address_lookup+0x330/0x330 [ 38.488054] ? check_preemption_disabled+0x41/0x280 [ 38.493049] ? nf_nat_cleanup_conntrack+0x1c0/0x1c0 [ 38.498045] ? mark_held_locks+0xa6/0xf0 [ 38.502095] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 38.507194] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 38.511769] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 38.516850] ? depot_save_stack+0x258/0x40a [ 38.521149] ? kasan_kmalloc+0x139/0x160 [ 38.525188] __nf_nat_alloc_null_binding+0x164/0x1d0 [ 38.530271] ? nf_nat_setup_info+0x1f20/0x1f20 [ 38.534833] nfnetlink_parse_nat_setup+0x53a/0x640 [ 38.539738] ? mark_held_locks+0xf0/0xf0 [ 38.543774] ? nf_nat_inet_fn+0xb00/0xb00 [ 38.547901] ? lock_downgrade+0x720/0x720 [ 38.552024] ? lock_acquire+0x170/0x3c0 [ 38.555975] ? cache_alloc_refill+0x95/0x340 [ 38.560365] ? check_preemption_disabled+0x41/0x280 [ 38.565366] ? __nf_conntrack_alloc+0xda/0x5e0 [ 38.569922] ? check_preemption_disabled+0x41/0x280 [ 38.574915] ctnetlink_parse_nat_setup+0xb6/0x640 [ 38.579748] ctnetlink_create_conntrack+0x4bb/0x12c0 [ 38.584832] ? ctnetlink_change_synproxy.isra.0+0x380/0x380 [ 38.590524] ? hash_conntrack_raw+0x2d6/0x460 [ 38.595039] ? nf_ct_get_tuplepr+0x310/0x310 [ 38.599426] ? nf_ct_gc_expired+0x300/0x300 [ 38.603727] ? nfnetlink_rcv_msg+0x98d/0xf60 [ 38.608117] ctnetlink_new_conntrack+0x4f3/0xde0 [ 38.612909] ? ctnetlink_create_conntrack+0x12c0/0x12c0 [ 38.618339] ? nfnetlink_rcv_msg+0x98d/0xf60 [ 38.622729] ? nfnetlink_rcv_msg+0x95a/0xf60 [ 38.627119] ? ctnetlink_create_conntrack+0x12c0/0x12c0 [ 38.632462] nfnetlink_rcv_msg+0xc4f/0xf60 [ 38.636682] ? nfnetlink_net_exit_batch+0x150/0x150 [ 38.641685] ? __lock_acquire+0x6de/0x3ff0 [ 38.645901] ? cred_has_capability.isra.0+0x139/0x2b0 [ 38.651072] ? cred_has_capability.isra.0+0x1b0/0x2b0 [ 38.656239] ? check_nnp_nosuid.isra.0+0x2a0/0x2a0 [ 38.661144] ? check_nnp_nosuid.isra.0+0x2a0/0x2a0 [ 38.666055] netlink_rcv_skb+0x160/0x440 [ 38.670094] ? nfnetlink_net_exit_batch+0x150/0x150 [ 38.675090] ? netlink_ack+0xae0/0xae0 [ 38.678956] ? ns_capable+0xde/0x100 [ 38.682648] nfnetlink_rcv+0x1b2/0x41b [ 38.686513] ? nfnetlink_rcv_batch+0x1df0/0x1df0 [ 38.691247] netlink_unicast+0x4d5/0x690 [ 38.695285] ? netlink_sendskb+0x110/0x110 [ 38.699498] netlink_sendmsg+0x6bb/0xc40 [ 38.703536] ? nlmsg_notify+0x1a0/0x1a0 [ 38.707486] ? kernel_recvmsg+0x220/0x220 [ 38.711610] ? nlmsg_notify+0x1a0/0x1a0 [ 38.715561] sock_sendmsg+0xc3/0x120 [ 38.719258] ___sys_sendmsg+0x7bb/0x8e0 [ 38.723215] ? copy_msghdr_from_user+0x440/0x440 [ 38.727950] ? do_huge_pmd_anonymous_page+0x939/0x1cc0 [ 38.733206] ? prep_transhuge_page+0xa0/0xa0 [ 38.737594] ? check_preemption_disabled+0x41/0x280 [ 38.742589] ? mark_held_locks+0xf0/0xf0 [ 38.746642] ? __handle_mm_fault+0xf34/0x41c0 [ 38.751119] ? errseq_sample+0x56/0x70 [ 38.754986] ? vm_insert_page+0x9c0/0x9c0 [ 38.759168] ? __do_page_fault+0x71b/0xde0 [ 38.763425] ? __fdget+0x1a0/0x230 [ 38.766946] __x64_sys_sendmsg+0x132/0x220 [ 38.771165] ? __sys_sendmsg+0x1b0/0x1b0 [ 38.775245] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 38.779985] ? trace_hardirqs_off_caller+0x69/0x210 [ 38.784981] ? do_syscall_64+0x21/0x620 [ 38.788933] do_syscall_64+0xf9/0x620 [ 38.792713] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.797883] RIP: 0033:0x440629 [ 38.801052] 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 38.819932] RSP: 002b:00007fffd0ae4118 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 38.827617] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440629 [ 38.834863] RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 [ 38.842150] RBP: 00000000006ca018 R08: 0000000000000008 R09: 00000000004002c8 [ 38.849438] R10: 0000000000000014 R11: 0000000000000246 R12: 0000000000401e30 [ 38.856686] R13: 0000000000401ec0 R14: 0000000000000000 R15: 0000000000000000 [ 38.863942] Modules linked in: [ 38.867616] ---[ end trace 9231cd5f4216cf31 ]--- [ 38.872378] RIP: 0010:nf_nat_setup_info+0x2f6/0x1f20 [ 38.877528] Code: c1 ea 03 80 3c 02 00 0f 85 60 19 00 00 4a 8b 04 e5 60 53 af 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 [ 38.896581] RSP: 0018:ffff8880a50e6ed0 EFLAGS: 00010246 [ 38.901935] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85ee39cd [ 38.909221] RDX: 0000000000000000 RSI: ffffffff85ee2eb7 RDI: ffffffff89af5420 [ 38.916514] RBP: ffff8880a50e70b0 R08: 0000000000000000 R09: 0000000000000000 [ 38.923771] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000018 [ 38.931049] R13: ffff8880a50e6f70 R14: ffff8880a9443500 R15: 0000000000000000 [ 38.938342] FS: 0000000000975880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 38.946693] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.952561] CR2: 0000000020000606 CR3: 000000008dd49000 CR4: 00000000001406f0 [ 38.959870] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.967182] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.974452] Kernel panic - not syncing: Fatal exception [ 38.981134] Kernel Offset: disabled [ 38.984746] Rebooting in 86400 seconds..