l2tp_ppp: sess 4/0: set debug=cf10464f ============================= WARNING: suspicious RCU usage 4.17.0-rc6+ #72 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-executor1/14370: #0: 000000006ae98340 (sk_lock-AF_INET6){+.+.}, at: lock_sock include/net/sock.h:1474 [inline] #0: 000000006ae98340 (sk_lock-AF_INET6){+.+.}, at: sock_fasync+0x85/0x220 net/socket.c:1173 stack backtrace: CPU: 0 PID: 14370 Comm: syz-executor1 Not tainted 4.17.0-rc6+ #72 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4592 ireq_opt_deref include/net/inet_sock.h:135 [inline] inet_csk_route_req+0x957/0xda0 net/ipv4/inet_connection_sock.c:538 l2tp_ppp: sess 4/0: set debug=cf10464f dccp_v4_send_response+0xac/0x6c0 net/dccp/ipv4.c:485 dccp_v4_conn_request+0xc66/0x1360 net/dccp/ipv4.c:634 dccp_v6_conn_request+0xd9a/0x1640 net/dccp/ipv6.c:317 dccp_rcv_state_process+0x6de/0x1a0e net/dccp/input.c:612 dccp_v4_do_rcv+0x102/0x180 net/dccp/ipv4.c:683 dccp_v6_do_rcv+0x935/0xb60 net/dccp/ipv6.c:579 sk_backlog_rcv include/net/sock.h:914 [inline] __release_sock+0x12f/0x3a0 net/core/sock.c:2342 release_sock+0xa4/0x2b0 net/core/sock.c:2857 sock_fasync+0x11e/0x220 net/socket.c:1182 __fput+0x664/0x890 fs/file_table.c:206 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1e4/0x290 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x2bd/0x310 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+0x6ac/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a09 RSP: 002b:00007ff9c0ee7c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007ff9c0ee86d4 RCX: 0000000000455a09 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 000000000072c000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000053 R14: 00000000006f5868 R15: 0000000000000002 ============================= WARNING: suspicious RCU usage 4.17.0-rc6+ #72 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-executor1/14370: #0: 000000006ae98340 (sk_lock-AF_INET6){+.+.}, at: lock_sock include/net/sock.h:1474 [inline] #0: 000000006ae98340 (sk_lock-AF_INET6){+.+.}, at: sock_fasync+0x85/0x220 net/socket.c:1173 stack backtrace: CPU: 0 PID: 14370 Comm: syz-executor1 Not tainted 4.17.0-rc6+ #72 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4592 ireq_opt_deref include/net/inet_sock.h:135 [inline] dccp_v4_send_response+0x526/0x6c0 net/dccp/ipv4.c:496 dccp_v4_conn_request+0xc66/0x1360 net/dccp/ipv4.c:634 dccp_v6_conn_request+0xd9a/0x1640 net/dccp/ipv6.c:317 dccp_rcv_state_process+0x6de/0x1a0e net/dccp/input.c:612 dccp_v4_do_rcv+0x102/0x180 net/dccp/ipv4.c:683 dccp_v6_do_rcv+0x935/0xb60 net/dccp/ipv6.c:579 sk_backlog_rcv include/net/sock.h:914 [inline] __release_sock+0x12f/0x3a0 net/core/sock.c:2342 release_sock+0xa4/0x2b0 net/core/sock.c:2857 sock_fasync+0x11e/0x220 net/socket.c:1182 __fput+0x664/0x890 fs/file_table.c:206 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1e4/0x290 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x2bd/0x310 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+0x6ac/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a09 RSP: 002b:00007ff9c0ee7c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007ff9c0ee86d4 RCX: 0000000000455a09 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 000000000072c000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000053 R14: 00000000006f5868 R15: 0000000000000002 l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f IPVS: set_ctl: invalid protocol: 46 0.0.1.255:20001 ovf l2tp_ppp: sess 4/0: set debug=cf10464f IPVS: set_ctl: invalid protocol: 46 0.0.1.255:20001 ovf l2tp_ppp: sess 4/0: set debug=cf10464f kernel msg: ebtables bug: please report to author: Entries_size never zero l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f netlink: 20 bytes leftover after parsing attributes in process `syz-executor3'. l2tp_ppp: sess 4/0: set debug=cf10464f netlink: 20 bytes leftover after parsing attributes in process `syz-executor3'. l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f l2tp_ppp: sess 4/0: set debug=cf10464f xt_cluster: you have exceeded the maximum number of cluster nodes (1243 > 32) IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21