netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. ====================================================== WARNING: possible circular locking dependency detected 4.14.209-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/29211 is trying to acquire lock: (&table[i].mutex){+.+.}, at: [] ip_set_nfnl_put+0x11a/0x310 net/netfilter/ipset/ip_set_core.c:732 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: -> #1 (&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 -> #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 ip_set_nfnl_put+0x11a/0x310 net/netfilter/ipset/ip_set_core.c:732 set_target_v1_destroy+0xd7/0x150 net/netfilter/xt_set.c:392 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+0x256/0x39e net/ipv4/netfilter/ip_tables.c:1674 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 raw_setsockopt+0xac/0xd0 net/ipv4/raw.c:857 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: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(&table[i].mutex); lock(&xt[i].mutex); lock(&table[i].mutex); *** DEADLOCK *** 1 lock held by syz-executor.4/29211: #0: (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x38/0x3d0 net/netfilter/x_tables.c:1092 stack backtrace: CPU: 1 PID: 29211 Comm: syz-executor.4 Not tainted 4.14.209-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+0x1b2/0x283 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 ip_set_nfnl_put+0x11a/0x310 net/netfilter/ipset/ip_set_core.c:732 set_target_v1_destroy+0xd7/0x150 net/netfilter/xt_set.c:392 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+0x256/0x39e net/ipv4/netfilter/ip_tables.c:1674 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 raw_setsockopt+0xac/0xd0 net/ipv4/raw.c:857 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: 0033:0x45deb9 RSP: 002b:00007fb643e81c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000002f540 RCX: 000000000045deb9 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 000000000118bf70 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffe031b8c3f R14: 00007fb643e829c0 R15: 000000000118bf2c ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. ip_tables: iptables: counters copy to user failed while replacing table netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. Cannot find add_set index 0 as target audit: type=1804 audit(1606465143.000:82): pid=29304 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir265650942/syzkaller.OTjn9B/1963/bus" dev="sda1" ino=17188 res=1 audit: type=1804 audit(1606465143.250:83): pid=29318 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir265650942/syzkaller.OTjn9B/1963/bus" dev="sda1" ino=17188 res=1 ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table Cannot find add_set index 0 as target audit: type=1804 audit(1606465143.580:84): pid=29339 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir655647764/syzkaller.7vTUEH/3357/bus" dev="sda1" ino=17191 res=1 ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. Cannot find add_set index 0 as target audit: type=1804 audit(1606465143.950:85): pid=29350 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir265650942/syzkaller.OTjn9B/1964/bus" dev="sda1" ino=17167 res=1 ip_tables: iptables: counters copy to user failed while replacing table Cannot find add_set index 0 as target audit: type=1804 audit(1606465144.390:86): pid=29371 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir655647764/syzkaller.7vTUEH/3358/bus" dev="sda1" ino=17177 res=1 netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. ip_tables: iptables: counters copy to user failed while replacing table Cannot find add_set index 0 as target audit: type=1804 audit(1606465144.910:87): pid=29394 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir265650942/syzkaller.OTjn9B/1965/bus" dev="sda1" ino=17198 res=1 netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. Cannot find add_set index 0 as target audit: type=1804 audit(1606465145.570:88): pid=29425 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir265650942/syzkaller.OTjn9B/1966/bus" dev="sda1" ino=17211 res=1 net_ratelimit: 2 callbacks suppressed ip_tables: iptables: counters copy to user failed while replacing table netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. Cannot find add_set index 0 as target audit: type=1804 audit(1606465146.220:89): pid=29473 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir265650942/syzkaller.OTjn9B/1967/bus" dev="sda1" ino=17221 res=1 ip_tables: iptables: counters copy to user failed while replacing table netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. Cannot find add_set index 0 as target ip_tables: iptables: counters copy to user failed while replacing table netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table Cannot find add_set index 0 as target netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. ip_tables: iptables: 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 netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. Cannot find add_set index 0 as target Cannot find add_set index 0 as target netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. Cannot find add_set index 0 as target