Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable ============================= WARNING: suspicious RCU usage 4.15.0-rc4+ #164 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 syzkaller667189/5780: #0: (sk_lock-AF_INET6){+.+.}, at: [<000000008d7d4e62>] lock_sock include/net/sock.h:1462 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<000000008d7d4e62>] do_ipv6_setsockopt.isra.9+0x23d/0x38f0 net/ipv6/ipv6_sockglue.c:167 stack backtrace: CPU: 0 PID: 5780 Comm: syzkaller667189 Not tainted 4.15.0-rc4+ #164 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+0xa7/0x640 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+0xeb/0x160 net/dccp/ipv4.c:682 dccp_v6_do_rcv+0x81a/0x9b0 net/dccp/ipv6.c:578 sk_backlog_rcv include/net/sock.h:907 [inline] __release_sock+0x124/0x360 net/core/sock.c:2274 release_sock+0xa4/0x2a0 net/core/sock.c:2789 do_ipv6_setsockopt.isra.9+0x50f/0x38f0 net/ipv6/ipv6_sockglue.c:898 ipv6_setsockopt+0xd7/0x150 net/ipv6/ipv6_sockglue.c:922 dccp_setsockopt+0x85/0xd0 net/dccp/proto.c:573 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1821 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1800 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x445ec9 RSP: 002b:00007fa001b58db8 EFLAGS: 00000297 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 0000000000445ec9 RDX: 0000000000000020 RSI: 0000000000000029 RDI: 0000000000000004 RBP: 00000000006dbc20 R08: 0000000000000020 R09: 0000000000000000 R10: 000000002030a000 R11: 0000000000000297 R12: 0000000000000000 R13: 00007fff809eec1f R14: 00007fa001b599c0 R15: 0000000000000001 ============================= WARNING: suspicious RCU usage 4.15.0-rc4+ #164 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 syzkaller667189/5780: #0: (sk_lock-AF_INET6){+.+.}, at: [<000000008d7d4e62>] lock_sock include/net/sock.h:1462 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<000000008d7d4e62>] do_ipv6_setsockopt.isra.9+0x23d/0x38f0 net/ipv6/ipv6_sockglue.c:167 stack backtrace: CPU: 0 PID: 5780 Comm: syzkaller667189 Not tainted 4.15.0-rc4+ #164 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+0x4b0/0x640 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+0xeb/0x160 net/dccp/ipv4.c:682 dccp_v6_do_rcv+0x81a/0x9b0 net/dccp/ipv6.c:578 sk_backlog_rcv include/net/sock.h:907 [inline] __release_sock+0x124/0x360 net/core/sock.c:2274 release_sock+0xa4/0x2a0 net/core/sock.c:2789 do_ipv6_setsockopt.isra.9+0x50f/0x38f0 net/ipv6/ipv6_sockglue.c:898 ipv6_setsockopt+0xd7/0x150 net/ipv6/ipv6_sockglue.c:922 dccp_setsockopt+0x85/0xd0 net/dccp/proto.c:573 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1821 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1800 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x445ec9 RSP: 002b:00007fa001b58db8 EFLAGS: 00000297 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 0000000000445ec9 RDX: 0000000000000020 RSI: 0000000000000029 RDI: 0000000000000004 RBP: 00000000006dbc20 R08: 0000000000000020 R09: 0000000000000000 R10: 000000002030a000 R11: 0000000000000297 R12: 0000000000000000 R13: 00007fff809eec1f R14: 00007fa001b599c0 R15: 0000000000000001 net_ratelimit: 986 callbacks suppressed Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable net_ratelimit: 1063 callbacks suppressed Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable