====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #297 Not tainted ------------------------------------------------------ syz-executor2/4217 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [<000000005af30a9a>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 but task is already holding lock: (&xt[i].mutex){+.+.}, at: [<000000000579cdfe>] 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 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2401 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-executor2/4217: #0: (&xt[i].mutex){+.+.}, at: [<000000000579cdfe>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041 stack backtrace: CPU: 0 PID: 4217 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: 0033:0x455d8a RSP: 002b:0000000000a2f598 EFLAGS: 00000206 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00000000006f8a40 RCX: 0000000000455d8a RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 00000000006f8a40 R08: 00000000000002d8 R09: 0000000000000001 R10: 00000000006f8e68 R11: 0000000000000206 R12: 0000000000000013 R13: 00000000006fb9e8 R14: 0000000000010b08 R15: 0000000000000001 device eql entered promiscuous mode capability: warning: `syz-executor3' uses deprecated v2 capabilities in a way that may be insecure TCP: request_sock_TCP: Possible SYN flooding on port 20006. Sending cookies. Check SNMP counters. device syz6 entered promiscuous mode device syz6 left promiscuous mode kauditd_printk_skb: 39 callbacks suppressed audit: type=1400 audit(1517835403.852:151): avc: denied { map } for pid=8137 comm="syz-executor4" path="/103/file0/bus" dev="ramfs" ino=23653 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:ramfs_t:s0 tclass=file permissive=1 PPPIOCDETACH file->f_count=2 audit: type=1400 audit(1517835404.321:152): avc: denied { ioctl } for pid=8170 comm="syz-executor1" path="socket:[23703]" dev="sockfs" ino=23703 ioctlcmd=0x8916 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(1517835404.353:153): avc: denied { getopt } for pid=8173 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1 audit: type=1400 audit(1517835404.353:154): avc: denied { setopt } for pid=8173 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1 IPVS: ftp: loaded support on port[0] = 21 audit: type=1400 audit(1517835404.797:155): avc: denied { map } for pid=8296 comm="syz-executor3" path="/dev/sg0" dev="devtmpfs" ino=9103 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:scsi_generic_device_t:s0 tclass=chr_file permissive=1 netlink: 'syz-executor7': attribute type 1 has an invalid length. netlink: 'syz-executor7': attribute type 1 has an invalid length. device syz3 entered promiscuous mode device syz3 left promiscuous mode audit: type=1400 audit(1517835405.211:156): avc: denied { create } for pid=8414 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_iscsi_socket permissive=1 *** Guest State *** CR0: actual=0x000000001ffffff0, shadow=0x000000007ffffff0, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002050, shadow=0x0000000000000000, gh_mask=ffffffffffffe871 CR3 = 0x00000000fffbc000 RSP = 0x0000000000000000 RIP = 0x0000000000008000 RFLAGS=0x00000002 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000 CS: sel=0x3000, attr=0x08093, limit=0xffffffff, base=0x0000000000030000 DS: sel=0x0000, attr=0x08093, limit=0xffffffff, base=0x0000000000000000 SS: sel=0x0000, attr=0x08093, limit=0xffffffff, base=0x0000000000000000 ES: sel=0x0000, attr=0x08093, limit=0xffffffff, base=0x0000000000000000 FS: sel=0x0000, attr=0x08093, limit=0xffffffff, base=0x0000000000000000 GS: sel=0x0000, attr=0x08093, limit=0xffffffff, base=0x0000000000000000 GDTR: limit=0x00000000, base=0x0000000000000000 LDTR: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 IDTR: limit=0x00000000, base=0x0000000000000000 TR: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 EFER = 0x0000000000000000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000008 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff811c99dc RSP = 0xffff8801b1cef3b8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007fc4d32b6700 GSBase=ffff8801db400000 TRBase=fffffe0000003000 GDTBase=fffffe0000001000 IDTBase=fffffe0000000000 CR0=0000000080050033 CR3=00000001b32f7001 CR4=00000000001626f0 Sysenter RSP=fffffe0000002200 CS:RIP=0010:ffffffff85a019f0 EFER = 0x0000000000000d01 PAT = 0x0000000000000000 *** Control State *** PinBased=0000003f CPUBased=b699edfa SecondaryExec=000000c2 EntryControls=0000d1ff ExitControls=0023efff ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000 VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000 VMExit: intr_info=00000000 errcode=00000000 ilen=00000003 reason=80000021 qualification=0000000000000000 IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xffffffd68770d745 EPT pointer = 0x00000001d783101e netlink: 6 bytes leftover after parsing attributes in process `syz-executor7'. audit: type=1400 audit(1517835406.421:157): avc: denied { getattr } for pid=8643 comm="syz-executor2" 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 dccp_close: ABORT with 2 bytes unread dccp_close: ABORT with 2 bytes unread sctp: [Deprecated]: syz-executor1 (pid 8919) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead Trying to set illegal importance in message Trying to set illegal importance in message audit: type=1400 audit(1517835407.565:158): avc: denied { ioctl } for pid=8993 comm="syz-executor7" path="socket:[24858]" dev="sockfs" ino=24858 ioctlcmd=0x8970 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 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770 sclass=netlink_route_socket pig=9078 comm=syz-executor3 QAT: Invalid ioctl SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770 sclass=netlink_route_socket pig=9089 comm=syz-executor3 QAT: Invalid ioctl QAT: Invalid ioctl sctp: [Deprecated]: syz-executor2 (pid 9228) Use of int in max_burst socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 9228) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 9238) Use of int in max_burst socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 9238) Use of int in maxseg socket option. Use struct sctp_assoc_value instead binder: 9278:9289 BC_INCREFS_DONE u0000000000000000 node 13 cookie mismatch 0000000000000002 != 0000000000000000 binder: 9278:9289 DecRefs 0 refcount change on invalid ref 0 ret -22 binder: 9278:9289 Release 1 refcount change on invalid ref 0 ret -22 binder: 9278:9289 ERROR: BC_REGISTER_LOOPER called without request binder: 9289 RLIMIT_NICE not set binder: 9289 RLIMIT_NICE not set binder: BINDER_SET_CONTEXT_MGR already set binder: 9278:9312 ioctl 40046207 0 returned -16 binder: 9278:9289 BC_INCREFS_DONE u0000000000000000 no match binder: 9278:9289 DecRefs 0 refcount change on invalid ref 0 ret -22 binder: 9278:9289 Release 1 refcount change on invalid ref 0 ret -22 binder: 9278:9289 ERROR: BC_REGISTER_LOOPER called without request binder: 9289 RLIMIT_NICE not set binder: release 9278:9289 transaction 14 in, still active binder: send failed reply for transaction 14 to 9278:9299 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 SELinux: unknown mount option IPv4: Oversized IP packet from 127.0.0.1 xt_cluster: this node mask cannot be higher than the total number of nodes sock: sock_set_timeout: `syz-executor5' (pid 9468) tries to set negative timeout xt_cluster: this node mask cannot be higher than the total number of nodes sock: sock_set_timeout: `syz-executor5' (pid 9475) tries to set negative timeout