Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable ============================= WARNING: suspicious RCU usage 4.15.0-rc8+ #197 Not tainted ----------------------------- ./include/net/inet_sock.h:136 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor5/13431: #0: (sk_lock-AF_INET6){+.+.}, at: [<0000000016ca95af>] lock_sock include/net/sock.h:1463 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<0000000016ca95af>] do_ipv6_setsockopt.isra.9+0x23d/0x39a0 net/ipv6/ipv6_sockglue.c:167 stack backtrace: CPU: 1 PID: 13431 Comm: syz-executor5 Not tainted 4.15.0-rc8+ #197 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 lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4585 ireq_opt_deref include/net/inet_sock.h:135 [inline] inet_csk_route_req+0x824/0xca0 net/ipv4/inet_connection_sock.c:544 dccp_v4_send_response+0xa7/0x650 net/dccp/ipv4.c:485 dccp_v4_conn_request+0x9ee/0x11b0 net/dccp/ipv4.c:633 dccp_v6_conn_request+0xd30/0x1350 net/dccp/ipv6.c:317 dccp_rcv_state_process+0x574/0x1620 net/dccp/input.c:612 dccp_v4_do_rcv+0xf1/0x160 net/dccp/ipv4.c:682 dccp_v6_do_rcv+0x823/0x9c0 net/dccp/ipv6.c:578 sk_backlog_rcv include/net/sock.h:908 [inline] __release_sock+0x124/0x360 net/core/sock.c:2274 release_sock+0xa4/0x2a0 net/core/sock.c:2789 do_ipv6_setsockopt.isra.9+0x50a/0x39a0 net/ipv6/ipv6_sockglue.c:898 ipv6_setsockopt+0xd7/0x150 net/ipv6/ipv6_sockglue.c:922 dccp_setsockopt+0x85/0xd0 net/dccp/proto.c:576 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1823 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1802 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007f6e2a7adc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452e99 RDX: 0000000000000020 RSI: 0000000000000029 RDI: 0000000000000013 RBP: 000000000000047f R08: 0000000000000020 R09: 0000000000000000 R10: 0000000020eaafe0 R11: 0000000000000212 R12: 00000000006f4c88 R13: 00000000ffffffff R14: 00007f6e2a7ae6d4 R15: 0000000000000006 ============================= WARNING: suspicious RCU usage 4.15.0-rc8+ #197 Not tainted ----------------------------- netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'. ./include/net/inet_sock.h:136 suspicious rcu_dereference_check() usage! netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'. other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor5/13431: #0: (sk_lock-AF_INET6){+.+.}, at: [<0000000016ca95af>] lock_sock include/net/sock.h:1463 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<0000000016ca95af>] do_ipv6_setsockopt.isra.9+0x23d/0x39a0 net/ipv6/ipv6_sockglue.c:167 Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable stack backtrace: CPU: 1 PID: 13431 Comm: syz-executor5 Not tainted 4.15.0-rc8+ #197 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 lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4585 ireq_opt_deref include/net/inet_sock.h:135 [inline] dccp_v4_send_response+0x4b6/0x650 net/dccp/ipv4.c:496 dccp_v4_conn_request+0x9ee/0x11b0 net/dccp/ipv4.c:633 dccp_v6_conn_request+0xd30/0x1350 net/dccp/ipv6.c:317 dccp_rcv_state_process+0x574/0x1620 net/dccp/input.c:612 dccp_v4_do_rcv+0xf1/0x160 net/dccp/ipv4.c:682 dccp_v6_do_rcv+0x823/0x9c0 net/dccp/ipv6.c:578 sk_backlog_rcv include/net/sock.h:908 [inline] __release_sock+0x124/0x360 net/core/sock.c:2274 release_sock+0xa4/0x2a0 net/core/sock.c:2789 do_ipv6_setsockopt.isra.9+0x50a/0x39a0 net/ipv6/ipv6_sockglue.c:898 ipv6_setsockopt+0xd7/0x150 net/ipv6/ipv6_sockglue.c:922 dccp_setsockopt+0x85/0xd0 net/dccp/proto.c:576 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1823 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1802 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007f6e2a7adc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452e99 RDX: 0000000000000020 RSI: 0000000000000029 RDI: 0000000000000013 RBP: 000000000000047f R08: 0000000000000020 R09: 0000000000000000 R10: 0000000020eaafe0 R11: 0000000000000212 R12: 00000000006f4c88 R13: 00000000ffffffff R14: 00007f6e2a7ae6d4 R15: 0000000000000006 netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. dccp_close: ABORT with 1 bytes unread TCP: request_sock_TCPv6: Possible SYN flooding on port 20026. Sending cookies. Check SNMP counters. netlink: 'syz-executor3': attribute type 2 has an invalid length. netlink: 'syz-executor3': attribute type 2 has an invalid length. sctp: [Deprecated]: syz-executor6 (pid 14231) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor6 (pid 14243) Use of int in maxseg socket option. Use struct sctp_assoc_value instead SELinux: unrecognized netlink message: protocol=0 nlmsg_type=9528 sclass=netlink_route_socket pig=14542 comm=syz-executor6 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=9528 sclass=netlink_route_socket pig=14542 comm=syz-executor6 audit: type=1400 audit(1516375595.251:82): avc: denied { read } for pid=14609 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 netlink: 'syz-executor0': attribute type 2 has an invalid length. netlink: 'syz-executor0': attribute type 2 has an invalid length. sctp: [Deprecated]: syz-executor5 (pid 14808) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor5 (pid 14821) Use of int in maxseg socket option. Use struct sctp_assoc_value instead tc_dump_action: action bad kind sctp: [Deprecated]: syz-executor2 (pid 14917) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor2 (pid 14917) Use of int in maxseg socket option. Use struct sctp_assoc_value instead netlink: 14 bytes leftover after parsing attributes in process `syz-executor5'. tc_dump_action: action bad kind tc_dump_action: action bad kind ip_tunnel: non-ECT from 0.0.0.0 with TOS=0x1 ip_tunnel: non-ECT from 0.0.0.0 with TOS=0x1 Trying to set illegal importance in message Trying to set illegal importance in message audit: type=1400 audit(1516375598.677:83): avc: denied { map } for pid=15628 comm="syz-executor4" path="socket:[70101]" dev="sockfs" ino=70101 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(1516375599.189:84): avc: denied { ioctl } for pid=15791 comm="syz-executor0" path="socket:[70226]" dev="sockfs" ino=70226 ioctlcmd=0x43d2 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_fib_lookup_socket permissive=1 openvswitch: netlink: Key type 1023 is out of range max 29 sctp: [Deprecated]: syz-executor0 (pid 16038) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor0 (pid 16038) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead dccp_close: ABORT with 253 bytes unread