====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #297 Not tainted ------------------------------------------------------ syz-executor7/11728 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [<00000000acb64f02>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [<000000002d3cdcba>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041 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+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041 xt_request_find_table_lock+0x28/0xc0 net/netfilter/x_tables.c:1088 get_info+0x154/0x690 net/ipv6/netfilter/ip6_tables.c:989 do_ip6t_get_ctl+0x159/0xaf0 net/ipv6/netfilter/ip6_tables.c:1710 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122 ipv6_getsockopt+0x1df/0x2e0 net/ipv6/ipv6_sockglue.c:1371 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3359 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2934 SYSC_getsockopt net/socket.c:1880 [inline] SyS_getsockopt+0x178/0x340 net/socket.c:1862 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b -> #1 (sk_lock-AF_INET6){+.+.}: lock_sock_nested+0xc2/0x110 net/core/sock.c:2777 lock_sock include/net/sock.h:1463 [inline] do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 net/ipv6/ipv6_sockglue.c:167 ipv6_setsockopt+0xd7/0x130 net/ipv6/ipv6_sockglue.c:922 udpv6_setsockopt+0x45/0x80 net/ipv6/udp.c:1422 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b -> #0 (rtnl_mutex){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1673 tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:654 __do_replace+0x79d/0xa50 net/ipv4/netfilter/ip_tables.c:1089 do_replace net/ipv4/netfilter/ip_tables.c:1145 [inline] do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1675 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1259 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b other info that might help us debug this: Chain exists of: rtnl_mutex --> sk_lock-AF_INET6 --> &xt[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(sk_lock-AF_INET6); lock(&xt[i].mutex); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor7/11728: #0: (&xt[i].mutex){+.+.}, at: [<000000002d3cdcba>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041 stack backtrace: CPU: 0 PID: 11728 Comm: syz-executor7 Not tainted 4.15.0+ #297 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+0x194/0x257 lib/dump_stack.c:53 print_circular_bug.isra.38+0x2cd/0x2dc kernel/locking/lockdep.c:1223 check_prev_add kernel/locking/lockdep.c:1863 [inline] check_prevs_add kernel/locking/lockdep.c:1976 [inline] validate_chain kernel/locking/lockdep.c:2417 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3431 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1673 tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:654 __do_replace+0x79d/0xa50 net/ipv4/netfilter/ip_tables.c:1089 do_replace net/ipv4/netfilter/ip_tables.c:1145 [inline] do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1675 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1259 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b RIP: 0033:0x453299 RSP: 002b:00007f687cfd7c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000016 RBP: 00000000000004d4 R08: 00000000000002e0 R09: 0000000000000000 R10: 0000000020777825 R11: 0000000000000212 R12: 00000000006f6480 R13: 00000000ffffffff R14: 00007f687cfd86d4 R15: 0000000000000000 netlink: 232 bytes leftover after parsing attributes in process `syz-executor3'. QAT: Invalid ioctl netlink: 'syz-executor0': attribute type 1 has an invalid length. QAT: Invalid ioctl syz-executor3 (11885) used greatest stack depth: 6736 bytes left kauditd_printk_skb: 63 callbacks suppressed audit: type=1400 audit(1517832936.743:236): avc: denied { transfer } for pid=11947 comm="syz-executor7" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=binder permissive=1 binder_alloc: binder_alloc_mmap_handler: 11947 20000000-20002000 already mapped failed -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 11947:11948 ioctl 40046207 0 returned -16 binder_alloc: 11947: binder_alloc_buf, no vma binder: 11947:11955 transaction failed 29189/-3, size 80-16 line 2957 netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. binder: 11947:11948 IncRefs 0 refcount change on invalid ref 2 ret -22 netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. binder: undelivered TRANSACTION_ERROR: 29189 binder: release 11947:11948 transaction 28 out, still active binder: unexpected work type, 4, not freed binder: unexpected work type, 4, not freed binder: undelivered TRANSACTION_COMPLETE binder: send failed reply for transaction 28, target dead openvswitch: netlink: Message has 8 unknown bytes. device eql entered promiscuous mode openvswitch: netlink: Message has 8 unknown bytes. SELinux: policydb magic number 0xbe765789 does not match expected magic number 0xf97cff8c SELinux: failed to load policy device gre0 entered promiscuous mode SELinux: unrecognized netlink message: protocol=9 nlmsg_type=24 sclass=netlink_audit_socket pig=12277 comm=syz-executor7 audit: type=1326 audit(1517832938.404:237): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12321 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 ALSA: seq fatal error: cannot create timer (-22) ALSA: seq fatal error: cannot create timer (-22) audit: type=1326 audit(1517832938.431:238): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12321 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=271 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832938.432:239): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12321 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832938.432:240): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12321 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832938.436:241): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12321 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=9 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832938.440:242): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12321 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832938.442:243): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12321 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=41 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832938.442:244): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12321 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832938.442:245): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12321 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 device eql entered promiscuous mode dccp_xmit_packet: Payload too large (65423) for featneg. dccp_xmit_packet: Payload too large (65423) for featneg. binder: BINDER_SET_CONTEXT_MGR already set binder_alloc: 12657: binder_alloc_buf, no vma binder: 12657:12660 ioctl 40046207 0 returned -16 binder: 12657:12669 transaction failed 29189/-3, size 0-0 line 2957 binder: undelivered TRANSACTION_ERROR: 29189 binder: release 12657:12660 transaction 35 out, still active binder: undelivered TRANSACTION_COMPLETE binder: send failed reply for transaction 35, target dead sock: sock_set_timeout: `syz-executor0' (pid 12761) tries to set negative timeout PPPIOCDETACH file->f_count=2 sock: sock_set_timeout: `syz-executor0' (pid 12761) tries to set negative timeout IPv4: Oversized IP packet from 127.0.0.1 binder: 12897:12905 got transaction with invalid handle, 0 binder: 12897:12905 transaction failed 29201/-22, size 56-8 line 3049 binder: 12897:12915 ioctl 400454c8 20107ffc returned -22 binder: BINDER_SET_CONTEXT_MGR already set binder: 12897:12915 ioctl 40046207 0 returned -16 binder: undelivered TRANSACTION_ERROR: 29201 encrypted_key: insufficient parameters specified encrypted_key: insufficient parameters specified TCP: request_sock_TCP: Possible SYN flooding on port 20010. Sending cookies. Check SNMP counters. QAT: Invalid ioctl ipt_CLUSTERIP: Please specify destination IP QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl kauditd_printk_skb: 10 callbacks suppressed audit: type=1400 audit(1517832943.586:256): avc: denied { setattr } for pid=13472 comm="syz-executor7" name="task" dev="proc" ino=33527 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=dir permissive=1 QAT: Invalid ioctl QAT: Invalid ioctl audit: type=1400 audit(1517832944.166:257): avc: denied { ioctl } for pid=13651 comm="syz-executor0" path="socket:[34159]" dev="sockfs" ino=34159 ioctlcmd=0x8901 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_crypto_socket permissive=1 Cannot find add_set index 0 as target Cannot find add_set index 0 as target dccp_close: ABORT with 2 bytes unread SELinux: Invalid class 85 audit: type=1326 audit(1517832944.828:258): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13831 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832944.829:259): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13831 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=281 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832944.829:260): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13831 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832944.829:261): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13831 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=257 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832944.829:262): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13831 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517832944.829:263): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13831 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=16 compat=0 ip=0x453299 code=0x7ffc0000 binder: BINDER_SET_CONTEXT_MGR already set audit: type=1326 audit(1517832944.829:264): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=13831 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 binder: 13863:13875 ioctl 40046207 0 returned -16 xt_CT: You must specify a L4 protocol, and not use inversions on it. xt_CT: You must specify a L4 protocol, and not use inversions on it.