====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #297 Not tainted ------------------------------------------------------ syz-executor2/5714 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [<000000006d05b9dd>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [<000000000696bc7f>] 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_ipt_get_ctl+0x159/0xac0 net/ipv4/netfilter/ip_tables.c:1699 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122 ip_getsockopt+0x15c/0x220 net/ipv4/ip_sockglue.c:1571 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_INET){+.+.}: lock_sock_nested+0xc2/0x110 net/core/sock.c:2777 lock_sock include/net/sock.h:1463 [inline] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 ip_setsockopt+0x3a/0xa0 net/ipv4/ip_sockglue.c:1252 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+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_INET --> &xt[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xt[i].mutex); lock(sk_lock-AF_INET); lock(&xt[i].mutex); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor2/5714: #0: (&xt[i].mutex){+.+.}, at: [<000000000696bc7f>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041 stack backtrace: CPU: 1 PID: 5714 Comm: syz-executor2 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:00007f495f8b4c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000014 RBP: 00000000000004d4 R08: 00000000000002e0 R09: 0000000000000000 R10: 0000000020777825 R11: 0000000000000212 R12: 00000000006f6480 R13: 00000000ffffffff R14: 00007f495f8b56d4 R15: 0000000000000000 binder: 5747:5754 BC_DEAD_BINDER_DONE 0000000000000000 not found binder: 5747:5765 BC_DEAD_BINDER_DONE 0000000000000000 not found SELinux: unrecognized netlink message: protocol=9 nlmsg_type=20 sclass=netlink_audit_socket pig=5839 comm=syz-executor7 audit: type=1400 audit(1517836064.965:53): avc: denied { write } for pid=5831 comm="syz-executor6" name="net" dev="proc" ino=15011 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 audit: type=1400 audit(1517836064.991:54): avc: denied { add_name } for pid=5831 comm="syz-executor6" name="pfkey" 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 SELinux: unrecognized netlink message: protocol=9 nlmsg_type=20 sclass=netlink_audit_socket pig=5854 comm=syz-executor7 audit: type=1400 audit(1517836064.992:55): avc: denied { create } for pid=5831 comm="syz-executor6" name="pfkey" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:insmod_t:s0 tclass=file permissive=1 audit: type=1400 audit(1517836065.116:56): avc: denied { map } for pid=5869 comm="syz-executor3" path=2F616E6F6E5F6875676570616765202864656C6574656429 dev="hugetlbfs" ino=15743 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:hugetlbfs_t:s0 tclass=file permissive=1 device syz2 entered promiscuous mode audit: type=1400 audit(1517836065.230:57): avc: denied { setopt } for pid=5894 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=netlink_generic_socket permissive=1 xt_l2tp: invalid flags combination: 8 xt_l2tp: invalid flags combination: 8 Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable TCP: request_sock_TCP: Possible SYN flooding on port 20018. Sending cookies. Check SNMP counters. Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable binder: 6043:6046 ERROR: BC_REGISTER_LOOPER called without request binder: 6043:6046 unknown command 0 binder: 6043:6046 ioctl c0306201 20007000 returned -22 audit: type=1400 audit(1517836065.746:58): avc: denied { map } for pid=6043 comm="syz-executor0" path="/dev/binder0" dev="devtmpfs" ino=9130 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:device_t:s0 tclass=chr_file permissive=1 binder: 6043:6046 BC_ACQUIRE_DONE uffffffffffffffff no match binder: 6046 RLIMIT_NICE not set binder: 6043:6058 BC_CLEAR_DEATH_NOTIFICATION invalid ref 0 binder: 6058 RLIMIT_NICE not set binder: BINDER_SET_CONTEXT_MGR already set binder: 6043:6061 ERROR: BC_REGISTER_LOOPER called without request binder: 6043:6058 ioctl 40046207 0 returned -16 binder: 6043:6061 unknown command 0 binder: 6043:6062 BC_CLEAR_DEATH_NOTIFICATION invalid ref 0 binder: 6043:6061 ioctl c0306201 20007000 returned -22 binder: 6062 RLIMIT_NICE not set binder: 6043:6058 BC_ACQUIRE_DONE uffffffffffffffff no match audit: type=1400 audit(1517836065.902:59): avc: denied { ipc_owner } for pid=6069 comm="syz-executor1" capability=15 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(1517836065.903:60): avc: denied { map } for pid=6066 comm="syz-executor5" 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 binder: 6112:6117 unknown command 0 binder: 6112:6117 ioctl c0306201 2000a000 returned -22 audit: type=1400 audit(1517836066.104:61): avc: denied { call } for pid=6112 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=binder permissive=1 kvm [6134]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0x186 data 0x9 binder_alloc: binder_alloc_mmap_handler: 6112 20000000-20002000 already mapped failed -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 6112:6117 ioctl 40046207 0 returned -16 device lo entered promiscuous mode device lo left promiscuous mode binder: 6112:6159 unknown command 0 binder: 6112:6159 ioctl c0306201 2000a000 returned -22 binder_alloc: 6112: binder_alloc_buf, no vma binder: 6112:6117 transaction failed 29189/-3, size 56-8 line 2957 kvm [6134]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0x186 data 0x9 binder: undelivered TRANSACTION_ERROR: 29189 binder: release 6112:6117 transaction 9 out, still active xt_cgroup: invalid path, errno=-2 binder: undelivered TRANSACTION_COMPLETE binder: send failed reply for transaction 9, target dead xt_cgroup: invalid path, errno=-2 Disabled LAPIC found during irq injection encrypted_key: insufficient parameters specified binder: 6483:6485 got reply transaction with no transaction stack binder: 6483:6485 transaction failed 29201/-71, size 0-0 line 2757 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl device eql entered promiscuous mode QAT: Invalid ioctl netlink: 'syz-executor1': attribute type 1 has an invalid length. l2tp_core: tunl 59: sockfd_lookup(fd=0) returned -88 netlink: 'syz-executor1': attribute type 1 has an invalid length. kauditd_printk_skb: 6 callbacks suppressed audit: type=1400 audit(1517836069.200:68): avc: denied { map } for pid=6833 comm="syz-executor3" path="/proc/334/net/pfkey" dev="proc" ino=4026532765 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:proc_net_t:s0 tclass=file permissive=1 mmap: syz-executor1 (6861) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. device eql entered promiscuous mode audit: type=1400 audit(1517836069.372:69): avc: denied { create } for pid=6879 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_crypto_socket permissive=1 audit: type=1400 audit(1517836069.377:70): avc: denied { bind } for pid=6879 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_crypto_socket permissive=1 audit: type=1400 audit(1517836069.451:71): avc: denied { map } for pid=6888 comm="syz-executor6" path="socket:[17984]" dev="sockfs" ino=17984 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=unix_stream_socket permissive=1 sctp: [Deprecated]: syz-executor1 (pid 7007) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor1 (pid 7018) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead audit: type=1326 audit(1517836070.436:72): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7068 comm="syz-executor0" exe="/root/syz-executor0" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517836070.438:73): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7068 comm="syz-executor0" exe="/root/syz-executor0" sig=0 arch=c000003e syscall=2 compat=0 ip=0x40d591 code=0x7ffc0000 audit: type=1326 audit(1517836070.463:74): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7068 comm="syz-executor0" exe="/root/syz-executor0" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517836070.463:75): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7068 comm="syz-executor0" exe="/root/syz-executor0" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517836070.511:76): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7068 comm="syz-executor0" exe="/root/syz-executor0" sig=0 arch=c000003e syscall=157 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517836070.511:77): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7068 comm="syz-executor0" exe="/root/syz-executor0" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 l2tp_core: tunl 2: fd 22 wrong protocol, got 0, expected 17 l2tp_core: tunl 2: fd 27 wrong protocol, got 0, expected 17 dccp_invalid_packet: P.Data Offset(0) too small dccp_invalid_packet: P.Data Offset(0) too small FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 0 PID: 7504 Comm: syz-executor2 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 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3605 kmalloc include/linux/slab.h:512 [inline] kzalloc include/linux/slab.h:701 [inline] kvm_uevent_notify_change.part.38+0x8d/0x430 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3871 kvm_uevent_notify_change arch/x86/kvm/../../../virt/kvm/kvm_main.c:3857 [inline] kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:715 [inline] kvm_put_kvm+0x181/0xde0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:756 kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:767 __fput+0x327/0x7e0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x199/0x270 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x275/0x2f0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_64+0x6ed/0x940 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x26/0x9b RIP: 0033:0x453299 RSP: 002b:00007f495f8b4c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000021