netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. audit: type=1800 audit(1582728027.112:308): pid=31051 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed" comm="syz-executor.2" name="bus" dev="sda1" ino=17457 res=0 ====================================================== WARNING: possible circular locking dependency detected 4.14.171-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/31102 is trying to acquire lock: audit: type=1804 audit(1582728027.272:309): pid=31115 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir233529238/syzkaller.Pfzoju/894/bus" dev="sda1" ino=17399 res=1 (rtnl_mutex){+.+.}, at: [] unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1634 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x35/0x3d0 net/netfilter/x_tables.c:1092 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&xt[i].mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 xt_find_revision+0x89/0x200 net/netfilter/x_tables.c:373 nfnl_compat_get+0x1f7/0x8a0 net/netfilter/nft_compat.c:678 nfnetlink_rcv_msg+0xa08/0xc00 net/netfilter/nfnetlink.c:214 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2432 nfnetlink_rcv+0x1ab/0x1650 net/netfilter/nfnetlink.c:515 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1877 audit: type=1804 audit(1582728027.282:310): pid=31114 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir319971923/syzkaller.uip3Kr/950/bus" dev="sda1" ino=17537 res=1 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xc5/0x100 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #1 (&table[i].mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 nf_tables_netdev_event+0x10d/0x4d0 net/netfilter/nf_tables_netdev.c:122 notifier_call_chain+0x107/0x1a0 kernel/notifier.c:93 call_netdevice_notifiers net/core/dev.c:1687 [inline] rollback_registered_many+0x694/0xa70 net/core/dev.c:7205 rollback_registered+0xd6/0x180 net/core/dev.c:7247 unregister_netdevice_queue net/core/dev.c:8259 [inline] unregister_netdevice_queue+0x1a1/0x220 net/core/dev.c:8252 unregister_netdevice include/linux/netdevice.h:2442 [inline] ppp_release+0x177/0x1a0 drivers/net/ppp/ppp_generic.c:408 __fput+0x25f/0x790 fs/file_table.c:210 task_work_run+0x113/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1d6/0x220 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (rtnl_mutex){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1634 tee_tg_destroy+0x5c/0xb0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x169/0x220 net/ipv4/netfilter/ip_tables.c:666 __do_replace+0x38d/0x570 net/ipv4/netfilter/ip_tables.c:1086 do_replace net/ipv4/netfilter/ip_tables.c:1142 [inline] do_ipt_set_ctl+0x255/0x39d net/ipv4/netfilter/ip_tables.c:1674 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 ip_setsockopt net/ipv4/ip_sockglue.c:1255 [inline] ip_setsockopt+0x94/0xb0 net/ipv4/ip_sockglue.c:1240 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2451 SYSC_setsockopt net/socket.c:1865 [inline] SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Chain exists of: rtnl_mutex --> &table[i].mutex --> &xt[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(&table[i].mutex); lock(&xt[i].mutex); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor.1/31102: #0: (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x35/0x3d0 net/netfilter/x_tables.c:1092 stack backtrace: CPU: 0 PID: 31102 Comm: syz-executor.1 Not tainted 4.14.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 print_circular_bug.isra.0.cold+0x1c4/0x282 kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1634 tee_tg_destroy+0x5c/0xb0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x169/0x220 net/ipv4/netfilter/ip_tables.c:666 __do_replace+0x38d/0x570 net/ipv4/netfilter/ip_tables.c:1086 do_replace net/ipv4/netfilter/ip_tables.c:1142 [inline] do_ipt_set_ctl+0x255/0x39d net/ipv4/netfilter/ip_tables.c:1674 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 ip_setsockopt net/ipv4/ip_sockglue.c:1255 [inline] ip_setsockopt+0x94/0xb0 net/ipv4/ip_sockglue.c:1240 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2451 SYSC_setsockopt net/socket.c:1865 [inline] SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c449 RSP: 002b:00007f5ad64a0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f5ad64a16d4 RCX: 000000000045c449 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000410 R09: 0000000000000000 R10: 00000000200009c0 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a34 R14: 00000000004cc9b4 R15: 000000000076bf2c ip_tables: iptables: counters copy to user failed while replacing table netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. audit: type=1804 audit(1582728028.132:311): pid=31136 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir319971923/syzkaller.uip3Kr/951/bus" dev="sda1" ino=17398 res=1 ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table audit: type=1804 audit(1582728028.172:312): pid=31134 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir233529238/syzkaller.Pfzoju/895/bus" dev="sda1" ino=17425 res=1 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. ip_tables: iptables: counters copy to user failed while replacing table audit: type=1804 audit(1582728028.182:313): pid=31131 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir697167179/syzkaller.bT7U0o/935/bus" dev="sda1" ino=17809 res=1 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table audit: type=1804 audit(1582728029.032:314): pid=31178 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir319971923/syzkaller.uip3Kr/952/bus" dev="sda1" ino=17921 res=1 ip_tables: iptables: counters copy to user failed while replacing table audit: type=1804 audit(1582728029.082:315): pid=31180 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir697167179/syzkaller.bT7U0o/936/bus" dev="sda1" ino=17985 res=1 device macvlan2 entered promiscuous mode device veth15 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth15 left promiscuous mode ip_tables: iptables: counters copy to user failed while replacing table device macvlan2 entered promiscuous mode device veth17 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth17 left promiscuous mode device macvlan2 entered promiscuous mode device veth19 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth19 left promiscuous mode device macvlan2 entered promiscuous mode device veth37 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth37 left promiscuous mode device macvlan2 entered promiscuous mode device veth21 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth21 left promiscuous mode device macvlan2 entered promiscuous mode device veth39 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth39 left promiscuous mode device macvlan2 entered promiscuous mode device veth41 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth41 left promiscuous mode device macvlan2 entered promiscuous mode device veth43 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth43 left promiscuous mode device macvlan2 entered promiscuous mode device veth23 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth23 left promiscuous mode device macvlan2 entered promiscuous mode device veth17 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth17 left promiscuous mode device macvlan2 entered promiscuous mode device veth45 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth45 left promiscuous mode device macvlan2 entered promiscuous mode device veth25 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth25 left promiscuous mode device macvlan2 entered promiscuous mode device veth19 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth19 left promiscuous mode device macvlan2 entered promiscuous mode device veth47 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth47 left promiscuous mode device macvlan2 entered promiscuous mode device veth27 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth27 left promiscuous mode device macvlan2 entered promiscuous mode device veth21 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvlan2: link is not ready device veth21 left promiscuous mode devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options devpts: called with bogus options