============================= WARNING: suspicious RCU usage 4.19.0-rc5+ #243 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-executor5/15558: #0: 000000002ea732e0 (sk_lock-AF_INET6){+.+.}, at: lock_sock include/net/sock.h:1492 [inline] #0: 000000002ea732e0 (sk_lock-AF_INET6){+.+.}, at: inet_csk_accept+0xba/0xe70 net/ipv4/inet_connection_sock.c:442 stack backtrace: CPU: 0 PID: 15558 Comm: syz-executor5 Not tainted 4.19.0-rc5+ #243 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:4536 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 inet_csk_wait_for_connect net/ipv4/inet_connection_sock.c:409 [inline] inet_csk_accept+0x4f8/0xe70 net/ipv4/inet_connection_sock.c:460 inet_accept+0x14b/0x9e0 net/ipv4/af_inet.c:734 __sys_accept4+0x3b2/0x8a0 net/socket.c:1590 __do_sys_accept4 net/socket.c:1625 [inline] __se_sys_accept4 net/socket.c:1622 [inline] __x64_sys_accept4+0x97/0xf0 net/socket.c:1622 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcd0bdcbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000120 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457579 RDX: 0000000020752ffc RSI: 00000000200000c0 RDI: 0000000000000006 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcd0bdcc6d4 R13: 00000000004bd5b4 R14: 00000000004cbd10 R15: 00000000ffffffff ============================= WARNING: suspicious RCU usage 4.19.0-rc5+ #243 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-executor5/15558: #0: 000000002ea732e0 (sk_lock-AF_INET6){+.+.}, at: lock_sock include/net/sock.h:1492 [inline] #0: 000000002ea732e0 (sk_lock-AF_INET6){+.+.}, at: inet_csk_accept+0xba/0xe70 net/ipv4/inet_connection_sock.c:442 stack backtrace: CPU: 0 PID: 15558 Comm: syz-executor5 Not tainted 4.19.0-rc5+ #243 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:4536 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 inet_csk_wait_for_connect net/ipv4/inet_connection_sock.c:409 [inline] inet_csk_accept+0x4f8/0xe70 net/ipv4/inet_connection_sock.c:460 inet_accept+0x14b/0x9e0 net/ipv4/af_inet.c:734 __sys_accept4+0x3b2/0x8a0 net/socket.c:1590 __do_sys_accept4 net/socket.c:1625 [inline] __se_sys_accept4 net/socket.c:1622 [inline] __x64_sys_accept4+0x97/0xf0 net/socket.c:1622 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcd0bdcbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000120 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457579 RDX: 0000000020752ffc RSI: 00000000200000c0 RDI: 0000000000000006 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcd0bdcc6d4 R13: 00000000004bd5b4 R14: 00000000004cbd10 R15: 00000000ffffffff EXT4-fs (sda1): resizing filesystem from 524032 to 524032 blocks EXT4-fs (sda1): resizing filesystem from 524032 to 524032 blocks sctp: [Deprecated]: syz-executor5 (pid 15787) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor5 (pid 15794) Use of int in maxseg socket option. Use struct sctp_assoc_value instead IPVS: length: 239 != 24 dccp_close: ABORT with 971 bytes unread