ip6_tables: ip6tables: counters copy to user failed while replacing table ====================================================== WARNING: possible circular locking dependency detected 4.14.216-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/23893 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [] unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x38/0x3d0 net/netfilter/x_tables.c:1092 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&xt[i].mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 xt_find_revision+0x88/0x200 net/netfilter/x_tables.c:373 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 -> #1 (&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 tmpfs: No value for mount option 'nr_bl' 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:2442 [inline] ppp_release+0x177/0x1a0 drivers/net/ppp/ppp_generic.c:408 __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 -> #0 (rtnl_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 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:1685 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 other info that might help us debug this: Chain exists of: rtnl_mutex --> &table[i].mutex --> &xt[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(&table[i].mutex); lock(&xt[i].mutex); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor.4/23893: #0: (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x38/0x3d0 net/netfilter/x_tables.c:1092 stack backtrace: CPU: 1 PID: 23893 Comm: syz-executor.4 Not tainted 4.14.216-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 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:1685 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 RIP: 0033:0x45e219 RSP: 002b:00007f509f555c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 000000000119bfd0 R08: 0000000000000448 R09: 0000000000000000 R10: 0000000020000980 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffcb569379f R14: 00007f509f5569c0 R15: 000000000119bf8c ip6_tables: ip6tables: counters copy to user failed while replacing table print_req_error: I/O error, dev loop0, sector 0 tmpfs: No value for mount option 'nr_bl' audit: type=1800 audit(1610893533.989:144): pid=23924 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="sda1" ino=17264 res=0 audit: type=1804 audit(1610893534.019:145): pid=23924 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir034522792/syzkaller.LRkJwo/428/file0" dev="sda1" ino=17264 res=1 ip6_tables: ip6tables: counters copy to user failed while replacing table BTRFS info (device loop3): turning on flush-on-commit ip6_tables: ip6tables: counters copy to user failed while replacing table BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents ip6_tables: ip6tables: counters copy to user failed while replacing table BTRFS error (device loop3): open_ctree failed tmpfs: No value for mount option 'nr_bl' audit: type=1800 audit(1610893534.319:146): pid=23987 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="sda1" ino=16961 res=0 audit: type=1800 audit(1610893534.359:147): pid=24000 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="file0" dev="sda1" ino=16658 res=0 audit: type=1804 audit(1610893534.399:148): pid=24000 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir387311196/syzkaller.7lcIgp/317/file0" dev="sda1" ino=16658 res=1 audit: type=1804 audit(1610893534.669:149): pid=23987 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir034522792/syzkaller.LRkJwo/429/file0" dev="sda1" ino=16961 res=1 audit: type=1800 audit(1610893534.829:150): pid=24073 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="sda1" ino=17025 res=0 audit: type=1800 audit(1610893534.859:151): pid=24076 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="file0" dev="sda1" ino=17262 res=0 audit: type=1804 audit(1610893534.899:152): pid=24076 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir387311196/syzkaller.7lcIgp/318/file0" dev="sda1" ino=17262 res=1 audit: type=1804 audit(1610893534.929:153): pid=24073 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir034522792/syzkaller.LRkJwo/430/file0" dev="sda1" ino=17025 res=1 overlayfs: workdir and upperdir must be separate subtrees overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. ip6_tables: ip6tables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table ip6_tables: ip6tables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table FAT-fs (loop3): bread failed, FSINFO block (sector = 1) bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 1(bridge_slave_0) entered disabled state device bridge0 entered promiscuous mode netlink: 5 bytes leftover after parsing attributes in process `syz-executor.2'. bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered forwarding state IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 1(bridge_slave_0) entered disabled state FAT-fs (loop3): bread failed, FSINFO block (sector = 1) net_ratelimit: 5 callbacks suppressed ip_tables: iptables: counters copy to user failed while replacing table netlink: 5 bytes leftover after parsing attributes in process `syz-executor.2'. kauditd_printk_skb: 4 callbacks suppressed audit: type=1800 audit(1610893539.619:158): pid=24367 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=17287 res=0 ip_tables: iptables: counters copy to user failed while replacing table bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered forwarding state FAT-fs (loop3): bread failed, FSINFO block (sector = 1) IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready FAT-fs (loop3): bread failed, FSINFO block (sector = 1) bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 1(bridge_slave_0) entered disabled state netlink: 5 bytes leftover after parsing attributes in process `syz-executor.2'. bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered forwarding state x86/PAT: syz-executor.3:24395 map pfn RAM range req write-combining for [mem 0x3ed02000-0x3ed02fff], got write-back bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 1(bridge_slave_0) entered disabled state x86/PAT: syz-executor.3:24411 map pfn RAM range req write-combining for [mem 0x39202000-0x39202fff], got write-back netlink: 5 bytes leftover after parsing attributes in process `syz-executor.2'. bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered forwarding state audit: type=1800 audit(1610893542.629:159): pid=24432 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=17297 res=0 x86/PAT: syz-executor.3:24437 map pfn RAM range req write-combining for [mem 0x3ed02000-0x3ed02fff], got write-back x86/PAT: syz-executor.2:24438 map pfn RAM range req write-combining for [mem 0x39202000-0x39202fff], got write-back x86/PAT: syz-executor.2:24449 map pfn RAM range req write-combining for [mem 0x3c002000-0x3c002fff], got write-back x86/PAT: syz-executor.3:24453 map pfn RAM range req write-combining for [mem 0x39d02000-0x39d02fff], got write-back x86/PAT: syz-executor.2:24463 map pfn RAM range req write-combining for [mem 0x3bb02000-0x3bb02fff], got write-back