====================================================== WARNING: possible circular locking dependency detected 4.14.278-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/10178 is trying to acquire lock: (&table[i].mutex){+.+.}, at: [] nf_tables_netdev_event+0x10d/0x4d0 net/netfilter/nf_tables_netdev.c:122 but task is already holding lock: (rtnl_mutex){+.+.}, at: [] br_del_bridge+0x13/0xe0 net/bridge/br_if.c:403 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (rtnl_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630 tee_tg_destroy+0x5c/0xb0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x232/0x310 net/ipv6/netfilter/ip6_tables.c:685 __do_replace+0x38d/0x580 net/ipv6/netfilter/ip6_tables.c:1106 do_replace net/ipv6/netfilter/ip6_tables.c:1162 [inline] do_ip6t_set_ctl+0x256/0x3b0 net/ipv6/netfilter/ip6_tables.c:1688 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0xc0/0x120 net/ipv6/ipv6_sockglue.c:937 tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2830 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+0x46/0xbb -> #1 (&xt[i].mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 match_revfn+0x43/0x210 net/netfilter/x_tables.c:332 xt_find_revision+0x8d/0x1d0 net/netfilter/x_tables.c:380 nfnl_compat_get+0x1f7/0x870 net/netfilter/nft_compat.c:678 nfnetlink_rcv_msg+0x9bb/0xc00 net/netfilter/nfnetlink.c:214 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2455 nfnetlink_rcv+0x1ab/0x1da0 net/netfilter/nfnetlink.c:515 netlink_unicast_kernel net/netlink/af_netlink.c:1296 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1322 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1893 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 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+0x46/0xbb -> #0 (&table[i].mutex){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 nf_tables_netdev_event+0x10d/0x4d0 net/netfilter/nf_tables_netdev.c:122 notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93 call_netdevice_notifiers_info net/core/dev.c:1667 [inline] call_netdevice_notifiers net/core/dev.c:1683 [inline] rollback_registered_many+0x765/0xbb0 net/core/dev.c:7211 rollback_registered+0xca/0x170 net/core/dev.c:7253 unregister_netdevice_queue+0x1b4/0x360 net/core/dev.c:8274 br_del_bridge+0xa9/0xe0 net/bridge/br_if.c:419 br_ioctl_deviceless_stub+0x1ff/0x5f0 net/bridge/br_ioctl.c:380 sock_ioctl+0x254/0x4c0 net/socket.c:1038 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb 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 *** 2 locks held by syz-executor.0/10178: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x4c0 net/socket.c:1036 #1: (rtnl_mutex){+.+.}, at: [] br_del_bridge+0x13/0xe0 net/bridge/br_if.c:403 stack backtrace: CPU: 0 PID: 10178 Comm: syz-executor.0 Not tainted 4.14.278-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+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 nf_tables_netdev_event+0x10d/0x4d0 net/netfilter/nf_tables_netdev.c:122 notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93 call_netdevice_notifiers_info net/core/dev.c:1667 [inline] call_netdevice_notifiers net/core/dev.c:1683 [inline] rollback_registered_many+0x765/0xbb0 net/core/dev.c:7211 rollback_registered+0xca/0x170 net/core/dev.c:7253 unregister_netdevice_queue+0x1b4/0x360 net/core/dev.c:8274 br_del_bridge+0xa9/0xe0 net/bridge/br_if.c:419 br_ioctl_deviceless_stub+0x1ff/0x5f0 net/bridge/br_ioctl.c:380 sock_ioctl+0x254/0x4c0 net/socket.c:1038 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f2b2fc6c0e9 RSP: 002b:00007f2b2e5e1168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f2b2fd7ef60 RCX: 00007f2b2fc6c0e9 RDX: 0000000020000680 RSI: 00000000000089a1 RDI: 0000000000000003 RBP: 00007f2b2fcc608d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc933ea69f R14: 00007f2b2e5e1300 R15: 0000000000022000 device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode nested_vmx_exit_reflected failed vm entry 7 device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode nested_vmx_exit_reflected failed vm entry 7 nested_vmx_exit_reflected failed vm entry 7 nested_vmx_exit_reflected failed vm entry 7 nested_vmx_exit_reflected failed vm entry 7 nested_vmx_exit_reflected failed vm entry 7 nested_vmx_exit_reflected failed vm entry 7 nested_vmx_exit_reflected failed vm entry 7 nested_vmx_exit_reflected failed vm entry 7 nested_vmx_exit_reflected failed vm entry 7 new mount options do not match the existing superblock, will be ignored CIFS VFS: Malformed UNC in devname. audit: type=1800 audit(1652486887.634:2): pid=10448 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="loop2" ino=13 res=0 new mount options do not match the existing superblock, will be ignored CIFS VFS: Malformed UNC in devname. new mount options do not match the existing superblock, will be ignored CIFS VFS: Malformed UNC in devname. audit: type=1800 audit(1652486888.014:3): pid=10482 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="loop2" ino=15 res=0 new mount options do not match the existing superblock, will be ignored CIFS VFS: Malformed UNC in devname. audit: type=1800 audit(1652486888.394:4): pid=10502 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="loop2" ino=17 res=0 audit: type=1800 audit(1652486888.604:5): pid=10524 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="loop2" ino=19 res=0 audit: type=1800 audit(1652486889.124:6): pid=10558 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=14071 res=0 audit: type=1800 audit(1652486889.144:7): pid=10559 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="loop5" ino=21 res=0 audit: type=1800 audit(1652486889.604:8): pid=10573 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="loop5" ino=23 res=0 audit: type=1800 audit(1652486889.824:9): pid=10582 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=14071 res=0 audit: type=1800 audit(1652486890.114:10): pid=10592 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="loop5" ino=25 res=0 audit: type=1800 audit(1652486890.594:11): pid=10615 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=14072 res=0 new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored CIFS VFS: Malformed UNC in devname. CIFS VFS: Malformed UNC in devname. new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored CIFS VFS: Malformed UNC in devname. CIFS VFS: Malformed UNC in devname. do_dccp_setsockopt: sockopt(CHANGE_L/R) is deprecated: fix your app new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored CIFS VFS: Malformed UNC in devname. CIFS VFS: Malformed UNC in devname. PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex ecryptfs_parse_options: eCryptfs: unrecognized option [fusectl] ecryptfs_parse_options: You must supply at least one valid auth tok signature as a mount parameter; see the eCryptfs README Error parsing options; rc = [-22] ecryptfs_parse_options: eCryptfs: unrecognized option [fusectl] ecryptfs_parse_options: You must supply at least one valid auth tok signature as a mount parameter; see the eCryptfs README Error parsing options; rc = [-22] ecryptfs_parse_options: eCryptfs: unrecognized option [fusectl] ecryptfs_parse_options: You must supply at least one valid auth tok signature as a mount parameter; see the eCryptfs README Error parsing options; rc = [-22]