====================================================== WARNING: possible circular locking dependency detected 4.16.0-rc1+ #315 Not tainted ------------------------------------------------------ syz-executor2/5502 is trying to acquire lock: (sk_lock-AF_INET6){+.+.}, at: [<000000004a1d4004>] lock_sock include/net/sock.h:1463 [inline] (sk_lock-AF_INET6){+.+.}, at: [<000000004a1d4004>] do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 net/ipv6/ipv6_sockglue.c:167 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<000000005320e4dc>] 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 raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:870 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-executor2/5502: #0: (rtnl_mutex){+.+.}, at: [<000000005320e4dc>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 stack backtrace: CPU: 0 PID: 5502 Comm: syz-executor2 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:00007f3014bb3c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f3014bb46d4 RCX: 0000000000453a59 RDX: 000000000000002c RSI: 0000000000000029 RDI: 0000000000000013 RBP: 000000000071bea0 R08: 0000000000000108 R09: 0000000000000000 R10: 0000000020c6c000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000506 R14: 00000000006f7930 R15: 0000000000000000 capability: warning: `syz-executor1' uses 32-bit capabilities (legacy support in use) audit: type=1400 audit(1518814566.235:29): avc: denied { map_create } for pid=5552 comm="syz-executor0" 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(1518814566.239:30): avc: denied { map_read map_write } for pid=5552 comm="syz-executor0" 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(1518814566.282:31): avc: denied { relabelto } for pid=5550 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:ldconfig_cache_t:s0 tclass=packet permissive=1 netlink: 20 bytes leftover after parsing attributes in process `syz-executor0'. x86/PAT: syz-executor2:5873 map pfn RAM range req write-combining for [mem 0x1b5140000-0x1b5143fff], got write-back x86/PAT: syz-executor2:5873 map pfn RAM range req write-combining for [mem 0x1b5bb0000-0x1b5bb3fff], got write-back netlink: 'syz-executor6': attribute type 3 has an invalid length. netlink: 'syz-executor6': attribute type 3 has an invalid length. netlink: 'syz-executor5': attribute type 3 has an invalid length. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium netlink: 'syz-executor5': attribute type 3 has an invalid length. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl IPVS: set_ctl: invalid protocol: 1 0.0.0.0:24699 IPVS: set_ctl: invalid protocol: 1 0.0.0.0:24699 kauditd_printk_skb: 27 callbacks suppressed audit: type=1400 audit(1518814570.323:58): avc: denied { set_context_mgr } for pid=6509 comm="syz-executor6" 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: 6527 RLIMIT_NICE not set audit: type=1400 audit(1518814570.393:59): avc: denied { call } for pid=6509 comm="syz-executor6" 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: 6509: binder_alloc_buf, no vma binder: 6509:6547 transaction failed 29189/-3, size 0-0 line 2957 binder: BINDER_SET_CONTEXT_MGR already set binder: 6509:6560 ioctl 40046207 0 returned -16 binder: 6556 RLIMIT_NICE not set binder_alloc: 6509: binder_alloc_buf, no vma binder: 6509:6562 transaction failed 29189/-3, size 0-0 line 2957 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29189 netlink: 'syz-executor1': attribute type 2 has an invalid length. SELinux: unrecognized netlink message: protocol=6 nlmsg_type=25222 sclass=netlink_xfrm_socket pig=6573 comm=syz-executor3 netlink: 'syz-executor1': attribute type 2 has an invalid length. SELinux: unrecognized netlink message: protocol=6 nlmsg_type=25222 sclass=netlink_xfrm_socket pig=6585 comm=syz-executor3 xt_connbytes: Forcing CT accounting to be enabled netlink: 'syz-executor2': attribute type 1 has an invalid length. netlink: 'syz-executor2': attribute type 1 has an invalid length. x86/PAT: syz-executor7:6678 map pfn RAM range req write-combining for [mem 0x1b5140000-0x1b5143fff], got write-back x86/PAT: syz-executor5:6677 map pfn RAM range req write-combining for [mem 0x1b5bb0000-0x1b5bb1fff], got write-back x86/PAT: syz-executor5:6677 map pfn RAM range req write-combining for [mem 0x1a43c0000-0x1a43c1fff], got write-back x86/PAT: syz-executor7:6678 map pfn RAM range req write-combining for [mem 0x1a4370000-0x1a4373fff], got write-back x86/PAT: syz-executor7:6696 map pfn RAM range req write-combining for [mem 0x1b5bb0000-0x1b5bb3fff], got write-back audit: type=1400 audit(1518814571.052:60): avc: denied { map } for pid=6687 comm="syz-executor6" path="/selinux/mls" dev="selinuxfs" ino=12 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:security_t:s0 tclass=file permissive=1 netlink: 'syz-executor6': attribute type 3 has an invalid length. netlink: 'syz-executor6': attribute type 3 has an invalid length. binder_alloc: binder_alloc_mmap_handler: 6819 2023d000-2063d000 already mapped failed -16 audit: type=1400 audit(1518814571.788:61): avc: denied { create } for pid=6873 comm="syz-executor4" 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(1518814571.812:62): avc: denied { setopt } for pid=6874 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_generic_socket permissive=1 audit: type=1400 audit(1518814571.892:63): avc: denied { ioctl } for pid=6894 comm="syz-executor5" path="socket:[19783]" dev="sockfs" ino=19783 ioctlcmd=0x894b 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 audit: type=1400 audit(1518814572.582:64): avc: denied { fsetid } for pid=7103 comm="syz-executor5" capability=4 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 audit: type=1400 audit(1518814572.639:65): avc: denied { map } for pid=7119 comm="syz-executor5" path="socket:[19269]" dev="sockfs" ino=19269 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 x_tables: ip_tables: ah match: only valid for protocol 51 x_tables: ip_tables: ah match: only valid for protocol 51 Cannot find add_set index 0 as target Cannot find add_set index 0 as target xt_connbytes: Forcing CT accounting to be enabled device eql entered promiscuous mode device eql entered promiscuous mode IPv4: Oversized IP packet from 127.0.0.1 netlink: 'syz-executor3': attribute type 3 has an invalid length. netlink: 'syz-executor3': attribute type 3 has an invalid length. QAT: failed to copy from user. QAT: failed to copy from user. device lo entered promiscuous mode device lo left promiscuous mode device lo entered promiscuous mode device lo left promiscuous mode audit: type=1400 audit(1518814573.829:66): avc: denied { bind } for pid=7436 comm="syz-executor0" 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 ipt_CLUSTERIP: Please specify destination IP xt_recent: Unsupported user space flags (00000061) ipt_CLUSTERIP: Please specify destination IP mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium binder: 7621:7633 ioctl 5609 207f2000 returned -22 binder: 7621:7633 ioctl 5609 207f2000 returned -22 binder: BINDER_SET_CONTEXT_MGR already set binder: 7621:7635 ioctl 40046207 0 returned -16 audit: type=1400 audit(1518814574.595:67): avc: denied { setuid } for pid=7666 comm="syz-executor3" capability=7 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 ion_ioctl: ioctl validate failed