====================================================== WARNING: possible circular locking dependency detected 4.14.280-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/13576 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [] target_revfn+0x43/0x210 net/netfilter/x_tables.c:354 but task is already holding lock: (&table[i].mutex){+.+.}, at: [] nfnl_lock net/netfilter/nfnetlink.c:61 [inline] (&table[i].mutex){+.+.}, at: [] nfnetlink_rcv_msg+0x726/0xc00 net/netfilter/nfnetlink.c:209 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&table[i].mutex){+.+.}: __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 unregister_netdevice include/linux/netdevice.h:2444 [inline] rtnl_newlink+0x1611/0x1830 net/core/rtnetlink.c:2775 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4322 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2454 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 -> #1 (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+0x1fd/0x2d0 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+0x256/0x3a0 net/ipv4/netfilter/ip_tables.c:1676 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 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 -> #0 (&xt[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 target_revfn+0x43/0x210 net/netfilter/x_tables.c:354 xt_find_revision+0x15e/0x1d0 net/netfilter/x_tables.c:378 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:2454 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 other info that might help us debug this: Chain exists of: &xt[i].mutex --> rtnl_mutex --> &table[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&table[i].mutex); lock(rtnl_mutex); lock(&table[i].mutex); lock(&xt[i].mutex); *** DEADLOCK *** 1 lock held by syz-executor.5/13576: #0: (&table[i].mutex){+.+.}, at: [] nfnl_lock net/netfilter/nfnetlink.c:61 [inline] #0: (&table[i].mutex){+.+.}, at: [] nfnetlink_rcv_msg+0x726/0xc00 net/netfilter/nfnetlink.c:209 stack backtrace: CPU: 0 PID: 13576 Comm: syz-executor.5 Not tainted 4.14.280-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 target_revfn+0x43/0x210 net/netfilter/x_tables.c:354 xt_find_revision+0x15e/0x1d0 net/netfilter/x_tables.c:378 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:2454 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 RIP: 0033:0x7f9f0f3260e9 RSP: 002b:00007f9f0dc9b168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9f0f438f60 RCX: 00007f9f0f3260e9 RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000000000003 RBP: 00007f9f0f38008d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff180846cf R14: 00007f9f0dc9b300 R15: 0000000000022000 Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout bridge0: port 2(bridge_slave_1) entered disabled state IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 2(bridge_slave_1) entered disabled state FAT-fs (loop0): Directory bread(block 6) failed IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state base_sock_release(ffff888053d5e080) sk=ffff8880a9a32ac0 bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state base_sock_release(ffff888062d12900) sk=ffff8880aba8adc0 base_sock_release(ffff888053d73080) sk=ffff888093e00e00 base_sock_release(ffff888062c645c0) sk=ffff8880aae340c0 base_sock_release(ffff888062dbd940) sk=ffff8880b2fc6180 base_sock_release(ffff8880902bf640) sk=ffff888094c5a240 base_sock_release(ffff888053da71c0) sk=ffff88805f26ab00 IPVS: sync thread started: state = BACKUP, mcast_ifn = ip6_vti0, syncid = 3, id = 0 kauditd_printk_skb: 3 callbacks suppressed audit: type=1326 audit(1653349805.103:31304): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=13824 comm="syz-executor.0" exe="/root/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa1b797d0e9 code=0x3180000 unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 audit: type=1326 audit(1653349805.853:31305): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=13841 comm="syz-executor.0" exe="/root/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa1b797d0e9 code=0x3180000 hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected FAT-fs (loop4): Directory bread(block 6) failed usb usb9: usbfs: interface 0 claimed by hub while 'syz-executor.5' sets config #0 usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.5' sets config #1 audit: type=1326 audit(1653349806.733:31306): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=13874 comm="syz-executor.0" exe="/root/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa1b797d0e9 code=0x3180000 hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected usb usb9: usbfs: interface 0 claimed by hub while 'syz-executor.2' sets config #0 usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.5' sets config #0 usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.2' sets config #1 usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.5' sets config #1 hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected usb usb9: usbfs: interface 0 claimed by hub while 'syz-executor.5' sets config #1 audit: type=1326 audit(1653349807.573:31307): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=13918 comm="syz-executor.0" exe="/root/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa1b797d0e9 code=0x3180000 usb usb9: usbfs: interface 0 claimed by hub while 'syz-executor.5' sets config #0 usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.5' sets config #1 FAT-fs (loop4): Directory bread(block 6) failed hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected