====================================================== WARNING: possible circular locking dependency detected 4.14.232-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/9863 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: [] tun_detach drivers/net/tun.c:593 [inline] (rtnl_mutex){+.+.}, at: [] tun_chr_close+0x34/0x60 drivers/net/tun.c:2727 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 udpv6_setsockopt+0x45/0x80 net/ipv6/udp.c:1459 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: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 rollback_registered+0xca/0x170 net/core/dev.c:7245 unregister_netdevice_queue+0x1b4/0x360 net/core/dev.c:8266 unregister_netdevice include/linux/netdevice.h:2443 [inline] __tun_detach+0xca2/0xf60 drivers/net/tun.c:584 tun_detach drivers/net/tun.c:594 [inline] tun_chr_close+0x41/0x60 drivers/net/tun.c:2727 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 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 *** 1 lock held by syz-executor.2/9863: #0: (rtnl_mutex){+.+.}, at: [] tun_detach drivers/net/tun.c:593 [inline] #0: (rtnl_mutex){+.+.}, at: [] tun_chr_close+0x34/0x60 drivers/net/tun.c:2727 stack backtrace: CPU: 0 PID: 9863 Comm: syz-executor.2 Not tainted 4.14.232-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+0x765/0xba0 net/core/dev.c:7203 rollback_registered+0xca/0x170 net/core/dev.c:7245 unregister_netdevice_queue+0x1b4/0x360 net/core/dev.c:8266 unregister_netdevice include/linux/netdevice.h:2443 [inline] __tun_detach+0xca2/0xf60 drivers/net/tun.c:584 tun_detach drivers/net/tun.c:594 [inline] tun_chr_close+0x41/0x60 drivers/net/tun.c:2727 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4665d9 RSP: 002b:00007fb158efd188 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 RAX: 0000000000000003 RBX: 000000000056bf60 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd3f79810f R14: 00007fb158efd300 R15: 0000000000022000 audit: type=1804 audit(1621240754.501:4): pid=9895 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir414243009/syzkaller.5N1CKA/17/file1/file0" dev="loop4" ino=4 res=1 syz-executor.5 uses obsolete (PF_INET,SOCK_PACKET) FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) REISERFS warning (device loop0): super-6502 reiserfs_getopt: unknown mount option "€©¡—Ëm" REISERFS warning (device loop0): super-6502 reiserfs_getopt: unknown mount option "€©¡—Ëm" FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) sctp: [Deprecated]: syz-executor.1 (pid 10057) Use of int in maxseg socket option. Use struct sctp_assoc_value instead bridge0: port 3(ip6gretap0) entered blocking state bridge0: port 3(ip6gretap0) entered disabled state device ip6gretap0 entered promiscuous mode bridge0: port 3(ip6gretap0) entered blocking state bridge0: port 3(ip6gretap0) entered forwarding state EXT4-fs (loop2): bad s_want_extra_isize: 215 batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 team0: Device batadv_slave_0 is up. Set it down before adding it as a team port device ip6gretap0 left promiscuous mode bridge0: port 3(ip6gretap0) entered disabled state team0: Device batadv_slave_0 is up. Set it down before adding it as a team port NFQUEUE: number of total queues is 0 bridge0: port 3(ip6gretap0) entered blocking state bridge0: port 3(ip6gretap0) entered disabled state EXT4-fs (loop2): bad s_want_extra_isize: 215 device ip6gretap0 entered promiscuous mode bridge0: port 3(ip6gretap0) entered blocking state bridge0: port 3(ip6gretap0) entered forwarding state device ip6gretap0 left promiscuous mode bridge0: port 3(ip6gretap0) entered disabled state team0: Device batadv_slave_0 is up. Set it down before adding it as a team port bridge0: port 3(ip6gretap0) entered blocking state bridge0: port 3(ip6gretap0) entered disabled state device ip6gretap0 entered promiscuous mode bridge0: port 3(ip6gretap0) entered blocking state bridge0: port 3(ip6gretap0) entered forwarding state device ip6gretap0 left promiscuous mode NFQUEUE: number of total queues is 0 bridge0: port 3(ip6gretap0) entered disabled state NFQUEUE: number of total queues is 0 NFQUEUE: number of total queues is 0 NFQUEUE: number of total queues is 0 bridge0: port 3(ip6gretap0) entered blocking state bridge0: port 3(ip6gretap0) entered disabled state device ip6gretap0 entered promiscuous mode bridge0: port 3(ip6gretap0) entered blocking state bridge0: port 3(ip6gretap0) entered forwarding state device ip6gretap0 left promiscuous mode audit: type=1804 audit(1621240756.181:5): pid=10195 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir929674615/syzkaller.sR7Ixs/21/file1/bus" dev="loop2" ino=7 res=1 bridge0: port 3(ip6gretap0) entered disabled state audit: type=1804 audit(1621240756.211:6): pid=10195 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir929674615/syzkaller.sR7Ixs/21/file1/bus" dev="loop2" ino=7 res=1 attempt to access beyond end of device net_ratelimit: 16 callbacks suppressed ip6_tables: ip6tables: counters copy to user failed while replacing table loop2: rw=1, want=230, limit=87 audit: type=1804 audit(1621240756.241:7): pid=10205 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir929674615/syzkaller.sR7Ixs/21/file1/bus" dev="loop2" ino=7 res=1 ip6_tables: ip6tables: counters copy to user failed while replacing table audit: type=1804 audit(1621240756.241:8): pid=10206 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir929674615/syzkaller.sR7Ixs/21/file1/bus" dev="loop2" ino=7 res=1 ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on loop2 ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table (syz-executor.2,10271,0):ocfs2_parse_options:1484 ERROR: Unrecognized mount option "%}" or missing value (syz-executor.2,10271,1):ocfs2_fill_super:1217 ERROR: status = -22 squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on loop2 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored [EXT4 FS bs=1024, gc=1, bpg=8192, ipg=32, mo=e002e01c, mo2=0006] System zones: 1-2, 19-19, 35-38, 46-46 EXT4-fs (loop2): mounting with "discard" option, but the device does not support discard EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 net_ratelimit: 31 callbacks suppressed ip6_tables: ip6tables: counters copy to user failed while replacing table NFQUEUE: number of total queues is 0 NFQUEUE: number of total queues is 0 ip6_tables: ip6tables: counters copy to user failed while replacing table NFQUEUE: number of total queues is 0 ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table NFQUEUE: number of total queues is 0