syz-executor.0 (10132) used greatest stack depth: 24832 bytes left FAT-fs (loop5): Directory bread(block 3) failed FAT-fs (loop5): Directory bread(block 4) failed ====================================================== FAT-fs (loop5): Directory bread(block 5) failed WARNING: possible circular locking dependency detected 4.14.295-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/10217 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: netlink: 20 bytes leftover after parsing attributes in process `syz-executor.5'. ( FAT-fs (loop5): Directory bread(block 6) failed &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 rdev_del_virtual_intf_deprecated net/ieee802154/rdev-ops.h:24 [inline] ieee802154_del_iface+0x3c3/0x610 net/ieee802154/nl-phy.c:331 genl_family_rcv_msg+0x572/0xb20 net/netlink/genetlink.c:600 genl_rcv_msg+0xaf/0x140 net/netlink/genetlink.c:625 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2454 genl_rcv+0x24/0x40 net/netlink/genetlink.c:636 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+0x232/0x310 net/ipv6/netfilter/ip6_tables.c:685 __do_replace+0x38d/0x580 net/ipv4/netfilter/arp_tables.c:930 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 -> #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.4/10217: #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: 1 PID: 10217 Comm: syz-executor.4 Not tainted 4.14.295-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 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: 0033:0x7f579f56f5a9 RSP: 002b:00007f579dee2168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f579f68ff80 RCX: 00007f579f56f5a9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007f579f5ca580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffca6950adf R14: 00007f579dee2300 R15: 0000000000022000 FAT-fs (loop3): invalid media value (0x74) team0: Port device team_slave_1 removed FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop5): Directory bread(block 3) failed FAT-fs (loop1): invalid media value (0x74) FAT-fs (loop5): Directory bread(block 4) failed FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop5): Directory bread(block 5) failed FAT-fs (loop5): Directory bread(block 6) failed FAT-fs (loop5): Directory bread(block 3) failed FAT-fs (loop5): Directory bread(block 4) failed FAT-fs (loop3): Directory bread(block 3) failed FAT-fs (loop3): Directory bread(block 4) failed FAT-fs (loop0): Directory bread(block 3) failed FAT-fs (loop3): Directory bread(block 5) failed FAT-fs (loop0): Directory bread(block 4) failed FAT-fs (loop0): Directory bread(block 5) failed FAT-fs (loop0): Directory bread(block 6) failed FAT-fs (loop0): Directory bread(block 3) failed FAT-fs (loop1): invalid media value (0x74) netlink: 20 bytes leftover after parsing attributes in process `syz-executor.3'. FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop2): Directory bread(block 3) failed FAT-fs (loop3): Directory bread(block 6) failed FAT-fs (loop0): Directory bread(block 4) failed team0: Port device team_slave_1 removed FAT-fs (loop2): Directory bread(block 4) failed FAT-fs (loop0): Directory bread(block 5) failed FAT-fs (loop2): Directory bread(block 5) failed FAT-fs (loop2): Directory bread(block 6) failed FAT-fs (loop0): Directory bread(block 6) failed netlink: 20 bytes leftover after parsing attributes in process `syz-executor.5'. FAT-fs (loop0): Directory bread(block 3) failed netlink: 20 bytes leftover after parsing attributes in process `syz-executor.0'. FAT-fs (loop0): Directory bread(block 4) failed team0: Port device team_slave_1 removed netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'. team0: Port device team_slave_1 removed netlink: 20 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.5'. FAT-fs (loop2): Directory bread(block 3) failed FAT-fs (loop2): Directory bread(block 4) failed FAT-fs (loop2): Directory bread(block 5) failed FAT-fs (loop2): Directory bread(block 6) failed netlink: 20 bytes leftover after parsing attributes in process `syz-executor.0'. FAT-fs (loop2): Directory bread(block 3) failed FAT-fs (loop2): Directory bread(block 4) failed FAT-fs (loop3): Directory bread(block 3) failed FAT-fs (loop3): Directory bread(block 4) failed FAT-fs (loop3): Directory bread(block 5) failed FAT-fs (loop3): Directory bread(block 6) failed FAT-fs (loop3): Directory bread(block 3) failed FAT-fs (loop3): Directory bread(block 4) failed FAT-fs (loop3): Directory bread(block 5) failed netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'. FAT-fs (loop3): Directory bread(block 6) failed FAT-fs (loop3): Directory bread(block 3) failed FAT-fs (loop3): Directory bread(block 4) failed IPVS: ftp: loaded support on port[0] = 21 syz-executor.2 (10607) used greatest stack depth: 24336 bytes left usb usb9: usbfs: interface 0 claimed by hub while 'syz-executor.4' sets config #0 usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.4' 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.4' sets config #0 usb usb9: usbfs: interface 0 claimed by usbfs while 'syz-executor.4' sets config #1 audit: type=1804 audit(1666023876.349:2): pid=10726 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir1558914262/syzkaller.GyU5hw/41/bus" dev="sda1" ino=13977 res=1 PKCS7: Unknown OID: [4] 3.8 PKCS7: Only support pkcs7_signedData type audit: type=1800 audit(1666023876.349:3): pid=10726 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=13977 res=0 PKCS7: Unknown OID: [4] 3.8 PKCS7: Only support pkcs7_signedData type PKCS7: Unknown OID: [4] 3.8 PKCS7: Only support pkcs7_signedData type audit: type=1804 audit(1666023876.589:4): pid=10766 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir1558914262/syzkaller.GyU5hw/42/bus" dev="sda1" ino=14044 res=1 PKCS7: Unknown OID: [4] 3.8 PKCS7: Only support pkcs7_signedData type audit: type=1800 audit(1666023876.619:5): pid=10766 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=14044 res=0 audit: type=1804 audit(1666023876.659:6): pid=10770 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir600560068/syzkaller.cI3frm/43/bus" dev="sda1" ino=14047 res=1 audit: type=1800 audit(1666023876.659:7): pid=10770 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="sda1" ino=14047 res=0 audit: type=1804 audit(1666023876.919:8): pid=10800 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir1558914262/syzkaller.GyU5hw/43/bus" dev="sda1" ino=14034 res=1 audit: type=1800 audit(1666023876.929:9): pid=10800 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="bus" dev="sda1" ino=14034 res=0 audit: type=1804 audit(1666023876.989:10): pid=10808 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir600560068/syzkaller.cI3frm/44/bus" dev="sda1" ino=14047 res=1 audit: type=1800 audit(1666023876.989:11): pid=10808 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="sda1" ino=14047 res=0 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready