device lo entered promiscuous mode kvm [20367]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc2 data 0x1 Y4`Ҙ: renamed from lo ====================================================== WARNING: possible circular locking dependency detected 4.14.166-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/20359 is trying to acquire lock: (&table[i].mutex){+.+.}, at: [] nfnl_lock+0x24/0x30 net/netfilter/nfnetlink.c:61 but task is already holding lock: (rtnl_mutex){+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (rtnl_mutex){+.+.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 unregister_netdevice_notifier+0x5f/0x2c0 net/core/dev.c:1634 tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x1a6/0x260 net/ipv6/netfilter/ip6_tables.c:684 __do_replace+0x3c5/0x5c0 net/ipv6/netfilter/ip6_tables.c:1105 do_replace net/ipv6/netfilter/ip6_tables.c:1161 [inline] do_ip6t_set_ctl+0x296/0x3f4 net/ipv6/netfilter/ip6_tables.c:1685 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt net/ipv6/ipv6_sockglue.c:930 [inline] ipv6_setsockopt+0x105/0x130 net/ipv6/ipv6_sockglue.c:914 rawv6_setsockopt+0x4f/0x110 net/ipv6/raw.c:1083 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:2968 SYSC_setsockopt net/socket.c:1865 [inline] SyS_setsockopt+0x13c/0x210 net/socket.c:1844 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #1 (&xt[i].mutex){+.+.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 xt_find_revision+0x82/0x200 net/netfilter/x_tables.c:373 nfnl_compat_get+0x229/0x950 net/netfilter/nft_compat.c:678 nfnetlink_rcv_msg+0xa08/0xc00 net/netfilter/nfnetlink.c:214 netlink_rcv_skb+0x14f/0x3c0 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+0x44d/0x650 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xb9/0x140 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2103 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (&table[i].mutex){+.+.}: 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+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 nfnl_lock+0x24/0x30 net/netfilter/nfnetlink.c:61 nf_tables_netdev_event+0x13f/0x580 net/netfilter/nf_tables_netdev.c:122 notifier_call_chain+0x111/0x1b0 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x56/0x70 net/core/dev.c:1671 call_netdevice_notifiers net/core/dev.c:1687 [inline] dev_change_name+0x4b4/0x990 net/core/dev.c:1236 dev_ifsioc+0x3d7/0x7f0 net/core/dev_ioctl.c:323 dev_ioctl+0x892/0xcb0 net/core/dev_ioctl.c:515 sock_do_ioctl+0x93/0xb0 net/socket.c:981 sock_ioctl+0x2a6/0x470 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Chain exists of: &table[i].mutex --> &xt[i].mutex --> rtnl_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rtnl_mutex); lock(&xt[i].mutex); lock(rtnl_mutex); lock(&table[i].mutex); *** DEADLOCK *** 1 lock held by syz-executor.0/20359: #0: (rtnl_mutex){+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 stack backtrace: CPU: 1 PID: 20359 Comm: syz-executor.0 Not tainted 4.14.166-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+0x142/0x197 lib/dump_stack.c:58 print_circular_bug.isra.0.cold+0x1cc/0x28f 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+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 nfnl_lock+0x24/0x30 net/netfilter/nfnetlink.c:61 nf_tables_netdev_event+0x13f/0x580 net/netfilter/nf_tables_netdev.c:122 notifier_call_chain+0x111/0x1b0 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x56/0x70 net/core/dev.c:1671 call_netdevice_notifiers net/core/dev.c:1687 [inline] dev_change_name+0x4b4/0x990 net/core/dev.c:1236 dev_ifsioc+0x3d7/0x7f0 net/core/dev_ioctl.c:323 dev_ioctl+0x892/0xcb0 net/core/dev_ioctl.c:515 sock_do_ioctl+0x93/0xb0 net/socket.c:981 sock_ioctl+0x2a6/0x470 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45b349 RSP: 002b:00007f384f6a6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f384f6a76d4 RCX: 000000000045b349 RDX: 0000000020000680 RSI: 0000000000008923 RDI: 000000000000000c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000003f5 R14: 00000000004d1710 R15: 000000000075bf2c netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. kvm [20388]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc2 data 0x1 kvm [20419]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc2 data 0x1 mmap: syz-executor.0 (20449) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. selinux_nlmsg_perm: 4763 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=20476 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=20476 comm=syz-executor.2 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. Unknown ioctl -1054845647 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. Unknown ioctl 1077171746 Unknown ioctl -1054845647 Unknown ioctl 1077171746 libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error kvm [20719]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc2 data 0x1 input: syz1 as /devices/virtual/input/input33 input: syz1 as /devices/virtual/input/input34 Unknown ioctl -1054845647 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. Unknown ioctl -1070836150 kvm [20761]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc2 data 0x1 Unknown ioctl -1054845647 Unknown ioctl -1070836150 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. kvm [20805]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc2 data 0x1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=24368 sclass=netlink_route_socket pig=20815 comm=syz-executor.2 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. kvm [20847]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc1 data 0x1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=20854 comm=syz-executor.0 netlink: 16 bytes leftover after parsing attributes in process `syz-executor.0'. kvm [20847]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc2 data 0x1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=20854 comm=syz-executor.0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=20854 comm=syz-executor.0 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=20854 comm=syz-executor.0 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=20854 comm=syz-executor.0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=20854 comm=syz-executor.0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=20854 comm=syz-executor.0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=20854 comm=syz-executor.0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=20854 comm=syz-executor.0