====================================================== WARNING: possible circular locking dependency detected 4.14.282-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/12464 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [] match_revfn+0x43/0x210 net/netfilter/x_tables.c:332 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] unregister_netdev+0x18/0x20 net/core/dev.c:8315 sixpack_close+0xd7/0x1c0 drivers/net/hamradio/6pack.c:687 tty_ldisc_close+0x8c/0xc0 drivers/tty/tty_ldisc.c:505 tty_ldisc_kill drivers/tty/tty_ldisc.c:651 [inline] tty_ldisc_hangup+0x269/0x6c0 drivers/tty/tty_ldisc.c:769 __tty_hangup.part.0+0x31a/0x730 drivers/tty/tty_io.c:622 __tty_hangup drivers/tty/tty_io.c:2600 [inline] tty_vhangup drivers/tty/tty_io.c:695 [inline] tty_ioctl+0x730/0x1430 drivers/tty/tty_io.c:2599 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 -> #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 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: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.2/12464: #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: 12464 Comm: syz-executor.2 Not tainted 4.14.282-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 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: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: 0033:0x7fdfdd71c109 RSP: 002b:00007fdfdc091168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fdfdd82ef60 RCX: 00007fdfdd71c109 RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000003 RBP: 00007fdfdd7760ad R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffddfc705df R14: 00007fdfdc091300 R15: 0000000000022000 bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered forwarding state overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered forwarding state overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered forwarding state overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: hidraw0: HID v0.00 Device [syz1] on %z5 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: hidraw0: HID v0.00 Device [syz1] on %z5 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: hidraw0: HID v0.00 Device [syz1] on %z5 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: hidraw1: HID v0.00 Device [syz1] on %z5 hid-generic 0000:0000:0000.0004: hidraw0: HID v0.00 Device [syz1] on %z5 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: hidraw0: HID v0.00 Device [syz1] on %z5 hid-generic 0000:0000:0000.0007: unknown main item tag 0x0 hid-generic 0000:0000:0000.0007: unknown main item tag 0x0 hid-generic 0000:0000:0000.0007: unknown main item tag 0x0 hid-generic 0000:0000:0000.0007: unknown main item tag 0x0 hid-generic 0000:0000:0000.0007: unknown main item tag 0x0 hid-generic 0000:0000:0000.0007: unknown main item tag 0x0 hid-generic 0000:0000:0000.0007: unknown main item tag 0x0 hid-generic 0000:0000:0000.0007: unknown main item tag 0x0 hid-generic 0000:0000:0000.0007: unknown main item tag 0x0 hid-generic 0000:0000:0000.0007: unknown main item tag 0x0 hid-generic 0000:0000:0000.0007: unknown main item tag 0x0 hid-generic 0000:0000:0000.0007: hidraw0: HID v0.00 Device [syz1] on %z5 hid-generic 0000:0000:0000.0008: unknown main item tag 0x0 hid-generic 0000:0000:0000.0008: unknown main item tag 0x0 hid-generic 0000:0000:0000.0008: unknown main item tag 0x0 hid-generic 0000:0000:0000.0008: unknown main item tag 0x0 hid-generic 0000:0000:0000.0008: unknown main item tag 0x0 hid-generic 0000:0000:0000.0008: unknown main item tag 0x0 hid-generic 0000:0000:0000.0008: unknown main item tag 0x0 hid-generic 0000:0000:0000.0008: unknown main item tag 0x0 hid-generic 0000:0000:0000.0008: unknown main item tag 0x0 hid-generic 0000:0000:0000.0008: unknown main item tag 0x0 hid-generic 0000:0000:0000.0008: unknown main item tag 0x0 hid-generic 0000:0000:0000.0008: hidraw0: HID v0.00 Device [syz1] on %z5 hid-generic 0000:0000:0000.0009: unknown main item tag 0x0 hid-generic 0000:0000:0000.0009: unknown main item tag 0x0 hid-generic 0000:0000:0000.0009: unknown main item tag 0x0 hid-generic 0000:0000:0000.0009: unknown main item tag 0x0 hid-generic 0000:0000:0000.0009: unknown main item tag 0x0 hid-generic 0000:0000:0000.0009: unknown main item tag 0x0 hid-generic 0000:0000:0000.0009: unknown main item tag 0x0 hid-generic 0000:0000:0000.0009: unknown main item tag 0x0 hid-generic 0000:0000:0000.0009: unknown main item tag 0x0 hid-generic 0000:0000:0000.0009: unknown main item tag 0x0 hid-generic 0000:0000:0000.0009: unknown main item tag 0x0 hid-generic 0000:0000:0000.0009: hidraw1: HID v0.00 Device [syz1] on %z5 (syz-executor.3,12876,0):dlmfs_mkdir:481 ERROR: invalid domain name for directory. caif:caif_disconnect_client(): nothing to disconnect (syz-executor.3,12896,0):dlmfs_mkdir:481 ERROR: invalid domain name for directory. caif:caif_disconnect_client(): nothing to disconnect syz-executor.2 uses obsolete (PF_INET,SOCK_PACKET) caif:caif_disconnect_client(): nothing to disconnect (syz-executor.3,12928,1):dlmfs_mkdir:481 ERROR: invalid domain name for directory. caif:caif_disconnect_client(): nothing to disconnect (syz-executor.3,12943,0):dlmfs_mkdir:481 ERROR: invalid domain name for directory. Restarting kernel threads ... done. usb usb9: usbfs: interface 0 claimed by hub while 'syz-executor.3' sets config #0 usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.3' sets config #1 hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected