====================================================== WARNING: possible circular locking dependency detected 4.14.236-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:3/562 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: [] ip6gre_exit_net+0x70/0x570 net/ipv6/ip6_gre.c:1207 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:684 __do_replace+0x38d/0x580 net/ipv6/netfilter/ip6_tables.c:1105 do_replace net/ipv6/netfilter/ip6_tables.c:1161 [inline] do_ip6t_set_ctl+0x256/0x3b0 net/ipv6/netfilter/ip6_tables.c:1687 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:2828 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 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:2433 nfnetlink_rcv+0x1ab/0x1da0 net/netfilter/nfnetlink.c:515 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878 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+0x765/0xba0 net/core/dev.c:7203 unregister_netdevice_many.part.0+0x18/0x2e0 net/core/dev.c:8285 unregister_netdevice_many+0x36/0x50 net/core/dev.c:8284 ip6gre_exit_net+0x41e/0x570 net/ipv6/ip6_gre.c:1209 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:142 cleanup_net+0x3b3/0x840 net/core/net_namespace.c:484 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 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 *** 4 locks held by kworker/u4:3/562: #0: ("%s""netns"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: (net_cleanup_work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 #2: (net_mutex){+.+.}, at: [] cleanup_net+0x110/0x840 net/core/net_namespace.c:450 #3: (rtnl_mutex){+.+.}, at: [] ip6gre_exit_net+0x70/0x570 net/ipv6/ip6_gre.c:1207 stack backtrace: CPU: 0 PID: 562 Comm: kworker/u4:3 Not tainted 4.14.236-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net 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+0x765/0xba0 net/core/dev.c:7203 unregister_netdevice_many.part.0+0x18/0x2e0 net/core/dev.c:8285 unregister_netdevice_many+0x36/0x50 net/core/dev.c:8284 ip6gre_exit_net+0x41e/0x570 net/ipv6/ip6_gre.c:1209 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:142 cleanup_net+0x3b3/0x840 net/core/net_namespace.c:484 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 sd 0:0:1:0: [sg0] tag#4495 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK sd 0:0:1:0: [sg0] tag#4495 CDB: Write Filemarks sd 0:0:1:0: [sg0] tag#4495 CDB[00]: 10 75 61 f9 b9 2c 59 f1 dd dd 98 b2 02 06 7e c7 sd 0:0:1:0: [sg0] tag#4495 CDB[10]: 4f 1d 49 37 e7 6a 95 1c 8b 27 0a ec ff 44 78 7a sd 0:0:1:0: [sg0] tag#4495 CDB[20]: 86 print_req_error: I/O error, dev loop3, sector 0 print_req_error: I/O error, dev loop3, sector 0 ISOFS: Unable to identify CD-ROM format. WARNING: can't dereference registers at 0000000000000a71 for ip retint_user+0x8/0x18 ISOFS: Unable to identify CD-ROM format. print_req_error: I/O error, dev loop1, sector 0 print_req_error: I/O error, dev loop1, sector 0 print_req_error: I/O error, dev loop3, sector 0 9pnet: Insufficient options for proto=fd tmpfs: Bad value 'default:' for mount option 'mpol' tmpfs: Bad value 'default:' for mount option 'mpol' EXT4-fs (loop0): VFS: Can't find ext4 filesystem EXT4-fs (loop4): VFS: Can't find ext4 filesystem EXT4-fs (loop0): VFS: Can't find ext4 filesystem EXT4-fs (loop4): VFS: Can't find ext4 filesystem tmpfs: Bad value 'default:31' for mount option 'mpol' EXT4-fs warning (device sda1): verify_group_input:131: Cannot add at group 255 (only 16 groups) EXT4-fs (loop0): VFS: Can't find ext4 filesystem print_req_error: I/O error, dev loop0, sector 0 Buffer I/O error on dev loop0, logical block 0, async page read print_req_error: I/O error, dev loop0, sector 4 Buffer I/O error on dev loop0, logical block 2, async page read print_req_error: I/O error, dev loop0, sector 6 Buffer I/O error on dev loop0, logical block 3, async page read ptrace attach of "/root/syz-executor.0"[16147] was attempted by "/root/syz-executor.0"[16149] REISERFS warning (device loop1): sh-2021 reiserfs_fill_super: can not find reiserfs on loop1 REISERFS warning (device loop1): sh-2021 reiserfs_fill_super: can not find reiserfs on loop1 REISERFS warning (device loop1): sh-2021 reiserfs_fill_super: can not find reiserfs on loop1 REISERFS warning (device loop1): sh-2021 reiserfs_fill_super: can not find reiserfs on loop1 REISERFS warning (device loop1): sh-2021 reiserfs_fill_super: can not find reiserfs on loop1 XFS (loop2): unknown mount option [appraise_type=imasig]. caif:caif_disconnect_client(): nothing to disconnect caif:caif_disconnect_client(): nothing to disconnect XFS (loop2): unknown mount option [appraise_type=imasig]. REISERFS warning (device loop4): super-6504 reiserfs_getopt: the option "nolargeio" requires an argument REISERFS warning (device loop4): super-6504 reiserfs_getopt: the option "nolargeio" requires an argument REISERFS warning (device loop5): super-6502 reiserfs_getopt: unknown mount option "" REISERFS warning (device loop4): super-6504 reiserfs_getopt: the option "nolargeio" requires an argument REISERFS warning (device loop5): super-6502 reiserfs_getopt: unknown mount option "" REISERFS warning (device loop0): jmacd-7 reiserfs_fill_super: resize option for remount only REISERFS warning (device loop4): super-6504 reiserfs_getopt: the option "nolargeio" requires an argument REISERFS warning (device loop0): jmacd-7 reiserfs_fill_super: resize option for remount only REISERFS warning (device loop4): super-6504 reiserfs_getopt: the option "nolargeio" requires an argument x_tables: ip_tables: TPROXY target: used from hooks INPUT/FORWARD, but only usable from PREROUTING x_tables: ip_tables: TPROXY target: used from hooks INPUT/FORWARD, but only usable from PREROUTING caif:caif_disconnect_client(): nothing to disconnect caif:caif_disconnect_client(): nothing to disconnect REISERFS warning (device loop4): super-6504 reiserfs_getopt: the option "grpjquota" requires an argument REISERFS warning (device loop4): super-6504 reiserfs_getopt: the option "grpjquota" requires an argument orangefs_mount: mount request failed with -4 orangefs_mount: mount request failed with -4 x_tables: ip_tables: TPROXY target: used from hooks INPUT/FORWARD, but only usable from PREROUTING x_tables: ip_tables: TPROXY target: used from hooks INPUT/FORWARD, but only usable from PREROUTING x_tables: ip_tables: TPROXY target: used from hooks INPUT/FORWARD, but only usable from PREROUTING REISERFS warning (device loop1): super-6507 reiserfs_parse_options: bad value 0x for -oresize REISERFS warning (device loop1): super-6507 reiserfs_parse_options: bad value 0x for -oresize XFS (loop1): sunit and swidth must be specified together REISERFS warning (device loop2): jmacd-7 reiserfs_fill_super: resize option for remount only XFS (loop1): sunit and swidth must be specified together REISERFS warning (device loop2): jmacd-7 reiserfs_fill_super: resize option for remount only REISERFS warning (device loop5): sh-2021 reiserfs_fill_super: can not find reiserfs on loop5 REISERFS warning (device loop5): sh-2021 reiserfs_fill_super: can not find reiserfs on loop5 Bluetooth: hci5 command 0x0405 tx timeout caif:caif_disconnect_client(): nothing to disconnect REISERFS warning (device loop2): super-6502 reiserfs_getopt: unknown mount option "subj_type=/dev/urandom" caif:caif_disconnect_client(): nothing to disconnect REISERFS warning (device loop2): super-6502 reiserfs_getopt: unknown mount option "subj_type=/dev/urandom"