================================================================== BUG: KCSAN: data-race in rcu_gp_fqs_check_wake / rcu_note_context_switch write to 0xffffffff85c7d190 of 8 bytes by task 8077 on cpu 0: rcu_preempt_ctxt_queue kernel/rcu/tree_plugin.h:223 [inline] rcu_note_context_switch+0x6f6/0x760 kernel/rcu/tree_plugin.h:315 __schedule+0xa4/0x690 kernel/sched/core.c:4019 preempt_schedule_common+0x37/0x90 kernel/sched/core.c:4236 preempt_schedule+0x30/0x40 kernel/sched/core.c:4261 ___preempt_schedule+0x16/0x18 arch/x86/entry/thunk_64.S:50 __local_bh_enable_ip+0x44/0x80 kernel/softirq.c:196 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:706 [inline] ip_finish_output2+0x421/0xea0 net/ipv4/ip_output.c:229 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0xfe/0x230 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x3a8/0xa40 net/ipv4/ip_output.c:532 ip_queue_xmit+0x45/0x60 include/net/ip.h:237 __tcp_transmit_skb+0xea3/0x1df0 net/ipv4/tcp_output.c:1170 tcp_transmit_skb net/ipv4/tcp_output.c:1186 [inline] tcp_write_xmit+0xa74/0x3190 net/ipv4/tcp_output.c:2441 __tcp_push_pending_frames+0x7b/0x1d0 net/ipv4/tcp_output.c:2617 tcp_push+0x1f7/0x3e0 net/ipv4/tcp.c:726 tcp_sendmsg_locked+0xf54/0x2040 net/ipv4/tcp.c:1392 tcp_sendmsg+0x39/0x60 net/ipv4/tcp.c:1436 inet_sendmsg+0x6d/0x90 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg+0x9f/0xc0 net/socket.c:659 __sys_sendto+0x21f/0x320 net/socket.c:1985 __do_sys_sendto net/socket.c:1997 [inline] __se_sys_sendto net/socket.c:1993 [inline] __x64_sys_sendto+0x89/0xb0 net/socket.c:1993 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffffffff85c7d190 of 8 bytes by task 10 on cpu 1: rcu_gp_fqs_check_wake kernel/rcu/tree.c:1606 [inline] rcu_gp_fqs_check_wake+0x93/0xd0 kernel/rcu/tree.c:1596 rcu_gp_fqs_loop+0x36c/0x580 kernel/rcu/tree.c:1661 rcu_gp_kthread+0x143/0x230 kernel/rcu/tree.c:1821 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 10 Comm: rcu_preempt Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================