============================= WARNING: suspicious RCU usage 4.19.0-rc2+ #126 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-executor1/5472: #0: 00000000335fb84e (sk_lock-AF_INET6){+.+.}, at: lock_sock include/net/sock.h:1491 [inline] #0: 00000000335fb84e (sk_lock-AF_INET6){+.+.}, at: inet_csk_accept+0xba/0xe70 net/ipv4/inet_connection_sock.c:442 stack backtrace: CPU: 0 PID: 5472 Comm: syz-executor1 Not tainted 4.19.0-rc2+ #126 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+0x1c9/0x2b4 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+0x96b/0xdb0 net/ipv4/inet_connection_sock.c:547 dccp_v4_send_response+0xb4/0x6d0 net/dccp/ipv4.c:485 dccp_v4_conn_request+0xc66/0x1370 net/dccp/ipv4.c:634 dccp_v6_conn_request+0xdad/0x1650 net/dccp/ipv6.c:317 dccp_rcv_state_process+0x6f7/0x1a30 net/dccp/input.c:612 dccp_v4_do_rcv+0x102/0x180 net/dccp/ipv4.c:683 dccp_v6_do_rcv+0x946/0xb80 net/dccp/ipv6.c:579 sk_backlog_rcv include/net/sock.h:931 [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+0x14c/0xa40 net/ipv4/af_inet.c:734 __sys_accept4+0x3b2/0x8a0 net/socket.c:1588 __do_sys_accept4 net/socket.c:1623 [inline] __se_sys_accept4 net/socket.c:1620 [inline] __ia32_sys_accept4+0x95/0xf0 net/socket.c:1620 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fc8ca9 Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5f610cc EFLAGS: 00000296 ORIG_RAX: 000000000000016c RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000020000240 RDX: 00000000200002c0 RSI: 0000000000000800 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ============================= WARNING: suspicious RCU usage 4.19.0-rc2+ #126 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-executor1/5472: #0: 00000000335fb84e (sk_lock-AF_INET6){+.+.}, at: lock_sock include/net/sock.h:1491 [inline] #0: 00000000335fb84e (sk_lock-AF_INET6){+.+.}, at: inet_csk_accept+0xba/0xe70 net/ipv4/inet_connection_sock.c:442 stack backtrace: CPU: 0 PID: 5472 Comm: syz-executor1 Not tainted 4.19.0-rc2+ #126 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+0x1c9/0x2b4 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+0xc66/0x1370 net/dccp/ipv4.c:634 dccp_v6_conn_request+0xdad/0x1650 net/dccp/ipv6.c:317 dccp_rcv_state_process+0x6f7/0x1a30 net/dccp/input.c:612 dccp_v4_do_rcv+0x102/0x180 net/dccp/ipv4.c:683 dccp_v6_do_rcv+0x946/0xb80 net/dccp/ipv6.c:579 sk_backlog_rcv include/net/sock.h:931 [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+0x14c/0xa40 net/ipv4/af_inet.c:734 __sys_accept4+0x3b2/0x8a0 net/socket.c:1588 __do_sys_accept4 net/socket.c:1623 [inline] __se_sys_accept4 net/socket.c:1620 [inline] __ia32_sys_accept4+0x95/0xf0 net/socket.c:1620 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fc8ca9 Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5f610cc EFLAGS: 00000296 ORIG_RAX: 000000000000016c RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000020000240 RDX: 00000000200002c0 RSI: 0000000000000800 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 dccp_close: ABORT with 2 bytes unread