====================================================== WARNING: possible circular locking dependency detected 4.16.0-rc1+ #315 Not tainted ------------------------------------------------------ syz-executor6/6130 is trying to acquire lock: (sk_lock-AF_INET6){+.+.}, at: [<00000000ee1ec78a>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET6){+.+.}, at: [<00000000ee1ec78a>] do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 net/ipv6/ipv6_sockglue.c:167 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<000000000acc2110>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 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+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 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2401 ipv6_setsockopt+0xa0/0x130 net/ipv6/ipv6_sockglue.c:917 sctp_setsockopt+0x2b6/0x61d0 net/sctp/socket.c:4104 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+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #1 (&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:1046 xt_request_find_table_lock+0x28/0xc0 net/netfilter/x_tables.c:1093 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+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (sk_lock-AF_INET6){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 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 sctp_setsockopt+0x2b6/0x61d0 net/sctp/socket.c:4104 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+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Chain exists of: sk_lock-AF_INET6 --> &xt[i].mutex --> rtnl_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rtnl_mutex); lock(&xt[i].mutex); lock(rtnl_mutex); lock(sk_lock-AF_INET6); *** DEADLOCK *** 1 lock held by syz-executor6/6130: #0: (rtnl_mutex){+.+.}, at: [<000000000acc2110>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 stack backtrace: CPU: 0 PID: 6130 Comm: syz-executor6 Not tainted 4.16.0-rc1+ #315 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 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 sctp_setsockopt+0x2b6/0x61d0 net/sctp/socket.c:4104 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+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453a59 RSP: 002b:00007f881f5bbc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f881f5bc6d4 RCX: 0000000000453a59 RDX: 000000000000002a RSI: 0000000000000029 RDI: 0000000000000013 RBP: 000000000071bea0 R08: 0000000000000088 R09: 0000000000000000 R10: 0000000020625000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004fb R14: 00000000006f7828 R15: 0000000000000000 QAT: Invalid ioctl QAT: Invalid ioctl binder: 6215:6217 transaction failed 29189/-22, size 40-8 line 2842 binder: BINDER_SET_CONTEXT_MGR already set binder_alloc: 6215: binder_alloc_buf, no vma binder: 6209:6228 ioctl 40046207 0 returned -16 binder: 6215:6217 transaction failed 29189/-3, size 40-8 line 2957 xt_connbytes: Forcing CT accounting to be enabled kauditd_printk_skb: 18 callbacks suppressed audit: type=1400 audit(1518818123.317:45): avc: denied { create } for pid=6301 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_connector_socket permissive=1 audit: type=1400 audit(1518818123.321:46): avc: denied { bind } for pid=6301 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_connector_socket permissive=1 audit: type=1400 audit(1518818123.324:47): avc: denied { getattr } for pid=6301 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_connector_socket permissive=1 sctp: [Deprecated]: syz-executor0 (pid 6357) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor0 (pid 6357) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead syz-executor4 (6501) used greatest stack depth: 12384 bytes left netlink: 'syz-executor2': attribute type 3 has an invalid length. QAT: Invalid ioctl netlink: 'syz-executor2': attribute type 3 has an invalid length. QAT: Invalid ioctl QAT: Invalid ioctl device eql entered promiscuous mode syz-executor1 uses obsolete (PF_INET,SOCK_PACKET) audit: type=1400 audit(1518818125.483:48): avc: denied { getopt } for pid=6804 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=netlink_generic_socket permissive=1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=23666 sclass=netlink_route_socket pig=6841 comm=syz-executor6 audit: type=1400 audit(1518818125.751:49): avc: denied { map } for pid=6883 comm="syz-executor1" path="/selinux/checkreqprot" dev="selinuxfs" ino=15 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:security_t:s0 tclass=file permissive=1 audit: type=1400 audit(1518818126.121:50): avc: denied { map } for pid=6997 comm="syz-executor7" path="/dev/loop7" dev="devtmpfs" ino=1114 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:fixed_disk_device_t:s0 tclass=blk_file permissive=1 netlink: 'syz-executor1': attribute type 4 has an invalid length. netlink: 17 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 'syz-executor1': attribute type 4 has an invalid length. netlink: 17 bytes leftover after parsing attributes in process `syz-executor1'. PPPIOCDETACH file->f_count=2 bpf: check failed: parse error bpf: check failed: parse error binder: 7268:7273 transaction failed 29189/-22, size 0-8 line 2842 binder: 7268:7273 ioctl c0306201 2000b000 returned -14 binder: 7268:7288 transaction failed 29189/-22, size 0-8 line 2842 binder: 7268:7288 ioctl c0306201 2000b000 returned -14 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29189 audit: type=1400 audit(1518818127.215:51): avc: denied { prog_run } for pid=7325 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 audit: type=1400 audit(1518818127.548:52): avc: denied { setattr } for pid=7444 comm="syz-executor2" name="clear_refs" dev="proc" ino=20645 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=file permissive=1 device syz0 entered promiscuous mode device syz0 left promiscuous mode IPv4: Oversized IP packet from 127.0.0.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=51306 sclass=netlink_route_socket pig=7554 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=51306 sclass=netlink_route_socket pig=7565 comm=syz-executor5 audit: type=1400 audit(1518818128.051:53): avc: denied { map } for pid=7597 comm="syz-executor7" path="/proc/401/net/dev" dev="proc" ino=4026533106 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:proc_net_t:s0 tclass=file permissive=1 ALSA: seq fatal error: cannot create timer (-22) ALSA: seq fatal error: cannot create timer (-22) audit: type=1400 audit(1518818128.269:54): avc: denied { map } for pid=7672 comm="syz-executor1" path=2F6D656D66643A202864656C6574656429 dev="tmpfs" ino=20920 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:tmpfs_t:s0 tclass=file permissive=1 dccp_invalid_packet: P.Data Offset(66) too large dccp_invalid_packet: P.Data Offset(66) too large audit: type=1400 audit(1518818128.523:55): avc: denied { map } for pid=7752 comm="syz-executor4" path="socket:[21037]" dev="sockfs" ino=21037 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_route_socket permissive=1 xt_connbytes: Forcing CT accounting to be enabled QAT: Invalid ioctl QAT: Invalid ioctl dccp_invalid_packet: P.Data Offset(0) too small xt_connbytes: Forcing CT accounting to be enabled mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium xt_TPROXY: Can be used only in combination with either -p tcp or -p udp xt_TPROXY: Can be used only in combination with either -p tcp or -p udp xt_connbytes: Forcing CT accounting to be enabled device syz1 entered promiscuous mode device syz1 left promiscuous mode device syz1 entered promiscuous mode IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE IPv6: NLM_F_CREATE should be set when creating new route IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE PPPIOCDETACH file->f_count=2 audit: type=1400 audit(1518818129.908:56): avc: denied { getopt } for pid=8090 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=netlink_netfilter_socket permissive=1 binder: 8301 RLIMIT_NICE not set audit: type=1326 audit(1518818130.672:57): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=8306 comm="syz-executor3" exe="/root/syz-executor3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x0 binder: 8301 RLIMIT_NICE not set audit: type=1326 audit(1518818130.697:58): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=8306 comm="syz-executor3" exe="/root/syz-executor3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x453a59 code=0x0 audit: type=1400 audit(1518818130.825:59): avc: denied { map } for pid=8360 comm="syz-executor2" path="pipe:[23622]" dev="pipefs" ino=23622 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=fifo_file permissive=1 netlink: 'syz-executor6': attribute type 21 has an invalid length. netlink: 'syz-executor6': attribute type 21 has an invalid length. netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. QAT: Invalid ioctl QAT: Invalid ioctl xt_CT: netfilter: NOTRACK target is deprecated, use CT instead or upgrade iptables