[   33.583630] audit: type=1800 audit(1579180671.845:33): pid=7167 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0
[   33.611100] audit: type=1800 audit(1579180671.845:34): pid=7167 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   37.446403] random: sshd: uninitialized urandom read (32 bytes read)
[   37.742550] audit: type=1400 audit(1579180676.005:35): avc:  denied  { map } for  pid=7343 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
[   37.795344] random: sshd: uninitialized urandom read (32 bytes read)
[   38.518677] random: sshd: uninitialized urandom read (32 bytes read)
[   38.724243] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.1.11' (ECDSA) to the list of known hosts.
[   44.332533] random: sshd: uninitialized urandom read (32 bytes read)
[   44.455644] audit: type=1400 audit(1579180682.715:36): avc:  denied  { map } for  pid=7355 comm="syz-executor243" path="/root/syz-executor243239082" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
[   44.701021] IPVS: ftp: loaded support on port[0] = 21
executing program
[   46.735409] ip_tables: iptables: counters copy to user failed while replacing table
[   46.744115] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
[   46.757062] audit: type=1400 audit(1579180685.015:37): avc:  denied  { create } for  pid=7359 comm="syz-executor243" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1
executing program
[   46.781467] audit: type=1400 audit(1579180685.015:38): avc:  denied  { write } for  pid=7359 comm="syz-executor243" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1
[   46.809698] ip_tables: iptables: counters copy to user failed while replacing table
[   46.817889] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
[   46.830804] 
[   46.832442] ======================================================
[   46.838745] WARNING: possible circular locking dependency detected
[   46.845102] 4.14.165-syzkaller #0 Not tainted
[   46.849589] ------------------------------------------------------
[   46.855902] syz-executor243/7361 is trying to acquire lock:
[   46.861598]  (&table[i].mutex){+.+.}, at: [<ffffffff8540bc24>] nfnl_lock+0x24/0x30
[   46.869329] 
[   46.869329] but task is already holding lock:
[   46.875489]  (rtnl_mutex){+.+.}, at: [<ffffffff85239119>] rtnetlink_rcv_msg+0x339/0xb70
[   46.884164] 
[   46.884164] which lock already depends on the new lock.
[   46.884164] 
[   46.892595] 
[   46.892595] the existing dependency chain (in reverse order) is:
[   46.900205] 
[   46.900205] -> #2 (rtnl_mutex){+.+.}:
[   46.905559]        lock_acquire+0x16f/0x430
[   46.909883]        __mutex_lock+0xe8/0x1470
[   46.914196]        mutex_lock_nested+0x16/0x20
[   46.918872]        rtnl_lock+0x17/0x20
[   46.922755]        unregister_netdevice_notifier+0x5f/0x2c0
[   46.928455]        tee_tg_destroy+0x61/0xc0
[   46.932836]        cleanup_entry+0x17d/0x230
[   46.937393]        __do_replace+0x3c5/0x5b0
[   46.941731]        do_ipt_set_ctl+0x296/0x3ee
[   46.946234]        nf_setsockopt+0x67/0xc0
[   46.950465]        ip_setsockopt+0x9b/0xb0
[   46.954698]        tcp_setsockopt+0x84/0xd0
[   46.959312]        sock_common_setsockopt+0x94/0xd0
[   46.964317]        SyS_setsockopt+0x13c/0x210
[   46.968800]        do_syscall_64+0x1e8/0x640
[   46.973217]        entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   46.978913] 
[   46.978913] -> #1 (&xt[i].mutex){+.+.}:
[   46.984377]        lock_acquire+0x16f/0x430
[   46.988692]        __mutex_lock+0xe8/0x1470
[   46.993000]        mutex_lock_nested+0x16/0x20
[   46.997620]        xt_find_revision+0x82/0x200
[   47.002269]        nfnl_compat_get+0x229/0x950
[   47.006913]        nfnetlink_rcv_msg+0xa08/0xc00
[   47.011668]        netlink_rcv_skb+0x14f/0x3c0
[   47.016315]        nfnetlink_rcv+0x1ab/0x1650
[   47.020811]        netlink_unicast+0x44d/0x650
[   47.025425]        netlink_sendmsg+0x7c4/0xc60
[   47.029992]        sock_sendmsg+0xce/0x110
[   47.034385]        ___sys_sendmsg+0x70a/0x840
[   47.038868]        __sys_sendmsg+0xb9/0x140
[   47.043261]        SyS_sendmsg+0x2d/0x50
[   47.047455]        do_syscall_64+0x1e8/0x640
[   47.051948]        entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   47.057839] 
[   47.057839] -> #0 (&table[i].mutex){+.+.}:
[   47.063555]        __lock_acquire+0x2cb3/0x4620
[   47.068212]        lock_acquire+0x16f/0x430
[   47.072662]        __mutex_lock+0xe8/0x1470
[   47.077009]        mutex_lock_nested+0x16/0x20
[   47.081599]        nfnl_lock+0x24/0x30
[   47.085499]        nf_tables_netdev_event+0x13f/0x580
[   47.090706]        notifier_call_chain+0x111/0x1b0
[   47.095645]        raw_notifier_call_chain+0x2e/0x40
[   47.100741]        call_netdevice_notifiers_info+0x56/0x70
[   47.106365]        rollback_registered_many+0x70d/0xb60
[   47.111722]        rollback_registered+0xdd/0x180
[   47.116552]        unregister_netdevice_queue+0x1ae/0x230
[   47.122090]        veth_newlink+0x58e/0x900
[   47.126411]        rtnl_newlink+0xecb/0x1700
[   47.130813]        rtnetlink_rcv_msg+0x3da/0xb70
[   47.135613]        netlink_rcv_skb+0x14f/0x3c0
[   47.140263]        rtnetlink_rcv+0x1d/0x30
[   47.144594]        netlink_unicast+0x44d/0x650
[   47.149166]        netlink_sendmsg+0x7c4/0xc60
[   47.153760]        sock_sendmsg+0xce/0x110
[   47.157997]        ___sys_sendmsg+0x70a/0x840
[   47.162484]        __sys_sendmsg+0xb9/0x140
[   47.166800]        SyS_sendmsg+0x2d/0x50
[   47.170847]        do_syscall_64+0x1e8/0x640
[   47.175242]        entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   47.180937] 
[   47.180937] other info that might help us debug this:
[   47.180937] 
[   47.189075] Chain exists of:
[   47.189075]   &table[i].mutex --> &xt[i].mutex --> rtnl_mutex
[   47.189075] 
[   47.199300]  Possible unsafe locking scenario:
[   47.199300] 
[   47.205447]        CPU0                    CPU1
[   47.210207]        ----                    ----
[   47.214855]   lock(rtnl_mutex);
[   47.218131]                                lock(&xt[i].mutex);
[   47.224087]                                lock(rtnl_mutex);
[   47.229873]   lock(&table[i].mutex);
[   47.233573] 
[   47.233573]  *** DEADLOCK ***
[   47.233573] 
[   47.239614] 1 lock held by syz-executor243/7361:
[   47.244355]  #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85239119>] rtnetlink_rcv_msg+0x339/0xb70
[   47.252941] 
[   47.252941] stack backtrace:
[   47.257429] CPU: 0 PID: 7361 Comm: syz-executor243 Not tainted 4.14.165-syzkaller #0
[   47.265300] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.274699] Call Trace:
[   47.277280]  dump_stack+0x142/0x197
[   47.281017]  print_circular_bug.isra.0.cold+0x1cc/0x28f
[   47.286411]  __lock_acquire+0x2cb3/0x4620
[   47.290559]  ? trace_hardirqs_on+0x10/0x10
[   47.294802]  ? bpf_prog_kallsyms_find+0x39/0x280
[   47.299562]  ? is_bpf_text_address+0xa6/0x120
[   47.304177]  lock_acquire+0x16f/0x430
[   47.307974]  ? nfnl_lock+0x24/0x30
[   47.311516]  ? nfnl_lock+0x24/0x30
[   47.315157]  __mutex_lock+0xe8/0x1470
[   47.318957]  ? nfnl_lock+0x24/0x30
[   47.322488]  ? __lock_acquire+0x2298/0x4620
[   47.326813]  ? debug_object_active_state+0x23c/0x370
[   47.331948]  ? nfnl_lock+0x24/0x30
[   47.335489]  ? mutex_trylock+0x1c0/0x1c0
[   47.339543]  ? trace_hardirqs_on+0x10/0x10
[   47.343816]  ? dropmon_net_event+0x210/0x440
[   47.348253]  ? save_trace+0x290/0x290
[   47.352059]  mutex_lock_nested+0x16/0x20
[   47.356107]  ? mutex_lock_nested+0x16/0x20
[   47.360331]  nfnl_lock+0x24/0x30
[   47.363687]  nf_tables_netdev_event+0x13f/0x580
[   47.368363]  ? mark_held_locks+0xb1/0x100
[   47.372705]  ? __local_bh_enable_ip+0x99/0x1a0
[   47.377292]  ? nf_tables_netdev_init_net+0x220/0x220
[   47.382495]  ? mirred_device_event+0x152/0x190
[   47.387079]  ? _raw_spin_unlock_bh+0x31/0x40
[   47.391490]  ? mirred_device_event+0x57/0x190
[   47.396044]  ? nfqnl_rcv_dev_event+0x23/0x440
[   47.400541]  notifier_call_chain+0x111/0x1b0
[   47.404952]  raw_notifier_call_chain+0x2e/0x40
[   47.409528]  call_netdevice_notifiers_info+0x56/0x70
[   47.414632]  rollback_registered_many+0x70d/0xb60
[   47.419523]  ? netdev_info+0xf0/0xf0
[   47.423235]  ? cpumask_next+0x35/0x40
[   47.427027]  rollback_registered+0xdd/0x180
[   47.431340]  ? rollback_registered_many+0xb60/0xb60
[   47.436465]  unregister_netdevice_queue+0x1ae/0x230
[   47.441475]  veth_newlink+0x58e/0x900
[   47.445259]  ? veth_poll_controller+0x10/0x10
[   47.449770]  ? rcu_lockdep_current_cpu_online+0xf2/0x140
[   47.455216]  ? __kmalloc_node+0x3d/0x80
[   47.459195]  ? rcu_read_lock_sched_held+0x110/0x130
[   47.464203]  ? kmem_cache_alloc_node_trace+0x379/0x770
[   47.469478]  ? __hw_addr_add_ex+0x1c0/0x280
[   47.473852]  ? kasan_unpoison_shadow+0x35/0x50
[   47.478437]  ? kasan_kmalloc+0xce/0xf0
[   47.482319]  ? __kmalloc_node+0x51/0x80
[   47.486322]  ? kvmalloc_node+0x56/0xe0
[   47.490209]  ? alloc_netdev_mqs+0x918/0xbc0
[   47.494520]  ? rtnl_create_link+0x12c/0x850
[   47.498843]  ? __netlink_ns_capable+0xe2/0x130
[   47.503433]  rtnl_newlink+0xecb/0x1700
[   47.507362]  ? veth_poll_controller+0x10/0x10
[   47.511869]  ? rtnl_link_unregister+0x200/0x200
[   47.516539]  ? avc_has_perm_noaudit+0x2b2/0x420
[   47.521200]  ? lock_acquire+0x16f/0x430
[   47.525519]  ? rtnetlink_rcv_msg+0x339/0xb70
[   47.529955]  ? rtnl_link_unregister+0x200/0x200
[   47.534623]  rtnetlink_rcv_msg+0x3da/0xb70
[   47.538849]  ? rtnl_bridge_getlink+0x7a0/0x7a0
[   47.543457]  ? netlink_deliver_tap+0x93/0x8f0
[   47.547956]  netlink_rcv_skb+0x14f/0x3c0
[   47.552016]  ? rtnl_bridge_getlink+0x7a0/0x7a0
[   47.556596]  ? lock_downgrade+0x740/0x740
[   47.560735]  ? netlink_ack+0x9a0/0x9a0
[   47.564614]  ? netlink_deliver_tap+0xba/0x8f0
[   47.569115]  rtnetlink_rcv+0x1d/0x30
[   47.572819]  netlink_unicast+0x44d/0x650
[   47.576865]  ? netlink_attachskb+0x6a0/0x6a0
[   47.581328]  ? security_netlink_send+0x81/0xb0
[   47.585896]  netlink_sendmsg+0x7c4/0xc60
[   47.589962]  ? netlink_unicast+0x650/0x650
[   47.594191]  ? security_socket_sendmsg+0x89/0xb0
[   47.599295]  ? netlink_unicast+0x650/0x650
[   47.603640]  sock_sendmsg+0xce/0x110
[   47.607356]  ___sys_sendmsg+0x70a/0x840
[   47.611318]  ? copy_msghdr_from_user+0x3f0/0x3f0
[   47.616068]  ? save_trace+0x290/0x290
[   47.619858]  ? selinux_file_alloc_security+0xb4/0x190
[   47.625052]  ? __fd_install+0x1fb/0x5f0
[   47.629041]  ? find_held_lock+0x35/0x130
[   47.633117]  ? __lock_is_held+0xb6/0x140
[   47.637183]  ? lock_downgrade+0x740/0x740
[   47.641349]  ? __fd_install+0x236/0x5f0
[   47.645327]  ? errseq_sample+0x4d/0x60
[   47.649240]  ? __fget_light+0x172/0x1f0
[   47.653216]  ? __fdget+0x1b/0x20
[   47.656588]  ? sockfd_lookup_light+0xb4/0x160
[   47.661077]  __sys_sendmsg+0xb9/0x140
[   47.664959]  ? SyS_shutdown+0x170/0x170
[   47.668930]  ? fd_install+0x4d/0x60
[   47.672661]  ? SyS_recv+0x40/0x40
[   47.676130]  SyS_sendmsg+0x2d/0x50
[   47.679669]  ? __sys_sendmsg+0x140/0x140
[   47.683731]  do_syscall_64+0x1e8/0x640
[   47.687618]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   47.692463]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   47.697655] RIP: 0033:0x4431f9
[   47.700973] RSP: 002b:00007fff194f5b88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   47.708666] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004431f9
[   47.715933] RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000004
[   47.723300] RBP: 000000000000b68c R08: 00007fff194f5d38 R09: 00007fff194f5d38
[   47.730576] R10: 00007fff194f5d38 R11: 0000000000000246 R12: 00000000006cedc8
executing program
[   47.737895] R13: 00000000006cf440 R14: 0000000000000000 R15: 0000000000000000
executing program
[   47.784902] ip_tables: iptables: counters copy to user failed while replacing table
[   47.793008] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
[   47.844493] ip_tables: iptables: counters copy to user failed while replacing table
[   47.852575] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
[   47.905636] ip_tables: iptables: counters copy to user failed while replacing table
[   47.913910] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
[   47.965400] ip_tables: iptables: counters copy to user failed while replacing table
[   47.973462] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
[   48.035394] ip_tables: iptables: counters copy to user failed while replacing table
[   48.043466] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
[   48.105413] ip_tables: iptables: counters copy to user failed while replacing table
[   48.113721] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
executing program
[   48.175396] ip_tables: iptables: counters copy to user failed while replacing table
[   48.183618] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
[   48.224429] ip_tables: iptables: counters copy to user failed while replacing table
[   48.232554] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
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[   51.794856] net_ratelimit: 78 callbacks suppressed
[   51.794859] ip_tables: iptables: counters copy to user failed while replacing table
[   51.808131] nla_parse: 78 callbacks suppressed
[   51.808134] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
[   51.885091] ip_tables: iptables: counters copy to user failed while replacing table
[   51.893489] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
[   51.955208] ip_tables: iptables: counters copy to user failed while replacing table
[   51.963458] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
[   52.035201] ip_tables: iptables: counters copy to user failed while replacing table
[   52.043361] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
executing program
[   52.104787] ip_tables: iptables: counters copy to user failed while replacing table
[   52.112971] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
[   52.164613] ip_tables: iptables: counters copy to user failed while replacing table
[   52.172661] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
[   52.234248] ip_tables: iptables: counters copy to user failed while replacing table
[   52.242386] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
executing program
[   52.305209] ip_tables: iptables: counters copy to user failed while replacing table
[   52.313577] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
[   52.355150] ip_tables: iptables: counters copy to user failed while replacing table
[   52.364341] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
executing program
[   52.404946] ip_tables: iptables: counters copy to user failed while replacing table
[   52.413106] netlink: 20 bytes leftover after parsing attributes in process `syz-executor243'.
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