IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready ============================= WARNING: suspicious RCU usage 4.19.0-rc3+ #218 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-executor4/8838: #0: 00000000399c543b (sk_lock-AF_INET6){+.+.}, at: lock_sock include/net/sock.h:1492 [inline] #0: 00000000399c543b (sk_lock-AF_INET6){+.+.}, at: sock_fasync+0x85/0x150 net/socket.c:1163 stack backtrace: CPU: 0 PID: 8838 Comm: syz-executor4 Not tainted 4.19.0-rc3+ #218 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+0x1c4/0x2b4 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4537 ireq_opt_deref include/net/inet_sock.h:135 [inline] inet_csk_route_req+0x977/0xde0 net/ipv4/inet_connection_sock.c:547 dccp_v4_send_response+0xb4/0x6d0 net/dccp/ipv4.c:485 dccp_v4_conn_request+0xc81/0x1390 net/dccp/ipv4.c:634 dccp_v6_conn_request+0xdb9/0x1660 net/dccp/ipv6.c:317 dccp_rcv_state_process+0x6f7/0x1a32 net/dccp/input.c:612 dccp_v4_do_rcv+0x102/0x180 net/dccp/ipv4.c:683 dccp_v6_do_rcv+0x99d/0xbf0 net/dccp/ipv6.c:579 sk_backlog_rcv include/net/sock.h:932 [inline] __release_sock+0x12f/0x3a0 net/core/sock.c:2336 release_sock+0xad/0x2c0 net/core/sock.c:2849 sock_fasync+0xf7/0x150 net/socket.c:1172 __fput+0x7e9/0xa30 fs/file_table.c:275 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x410e91 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffcd819aa60 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000410e91 RDX: 0000000000000000 RSI: 0000000000731448 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff R10: 00000000009300a0 R11: 0000000000000293 R12: 0000000000000007 R13: 0000000000025c60 R14: 0000000000000037 R15: badc0ffeebadface ============================= WARNING: suspicious RCU usage 4.19.0-rc3+ #218 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-executor4/8838: #0: 00000000399c543b (sk_lock-AF_INET6 ){+.+.}, at: lock_sock include/net/sock.h:1492 [inline] ){+.+.}, at: sock_fasync+0x85/0x150 net/socket.c:1163 stack backtrace: CPU: 0 PID: 8838 Comm: syz-executor4 Not tainted 4.19.0-rc3+ #218 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+0x1c4/0x2b4 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4537 ireq_opt_deref include/net/inet_sock.h:135 [inline] dccp_v4_send_response+0x537/0x6d0 net/dccp/ipv4.c:496 dccp_v4_conn_request+0xc81/0x1390 net/dccp/ipv4.c:634 dccp_v6_conn_request+0xdb9/0x1660 net/dccp/ipv6.c:317 dccp_rcv_state_process+0x6f7/0x1a32 net/dccp/input.c:612 dccp_v4_do_rcv+0x102/0x180 net/dccp/ipv4.c:683 dccp_v6_do_rcv+0x99d/0xbf0 net/dccp/ipv6.c:579 sk_backlog_rcv include/net/sock.h:932 [inline] __release_sock+0x12f/0x3a0 net/core/sock.c:2336 release_sock+0xad/0x2c0 net/core/sock.c:2849 sock_fasync+0xf7/0x150 net/socket.c:1172 __fput+0x7e9/0xa30 fs/file_table.c:275 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x410e91 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffcd819aa60 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000410e91 RDX: 0000000000000000 RSI: 0000000000731448 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff R10: 00000000009300a0 R11: 0000000000000293 R12: 0000000000000007 R13: 0000000000025c60 R14: 0000000000000037 R15: badc0ffeebadface IPVS: ftp: loaded support on port[0] = 21 audit: type=1107 audit(1537214895.690:2): pid=8920 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg=' ' audit: type=1107 audit(1537214895.710:3): pid=8920 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg=' ' IPVS: ftp: loaded support on port[0] = 21 kernel msg: ebtables bug: please report to author: Entries_size never zero sctp: [Deprecated]: syz-executor3 (pid 9008) Use of int in max_burst socket option. Use struct sctp_assoc_value instead kernel msg: ebtables bug: please report to author: Entries_size never zero sctp: [Deprecated]: syz-executor3 (pid 9018) Use of int in max_burst socket option. Use struct sctp_assoc_value instead nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. mip6: mip6_rthdr_init_state: state's mode is not 2: 0 mip6: mip6_rthdr_init_state: state's mode is not 2: 0 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready PF_BRIDGE: br_mdb_parse() with invalid ifindex PF_BRIDGE: br_mdb_parse() with invalid ifindex