syzbot

==================================================================
BUG: KCSAN: data-race in devlink_trap_report / devlink_trap_stats_put

read-write to 0xffffe8ffffd87fb0 of 8 bytes by task 54 on cpu 1:
 devlink_trap_stats_update net/core/devlink.c:9799 [inline]
 devlink_trap_report+0xd1/0x290 net/core/devlink.c:9836
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:575 [inline]
 nsim_dev_trap_report_work+0x4dc/0x5b0 drivers/net/netdevsim/dev.c:603
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
 worker_thread+0x635/0xb90 kernel/workqueue.c:2418
 kthread+0x1fa/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffffe8ffffd87fb0 of 8 bytes by task 15956 on cpu 0:
 devlink_trap_stats_read net/core/devlink.c:6741 [inline]
 devlink_trap_stats_put+0x97/0x270 net/core/devlink.c:6756
 devlink_nl_trap_group_fill+0x2c4/0x350 net/core/devlink.c:7038
 devlink_nl_cmd_trap_group_get_dumpit+0x193/0x270 net/core/devlink.c:7108
 genl_lock_dumpit+0x3c/0x60 net/netlink/genetlink.c:623
 netlink_dump+0x34a/0x690 net/netlink/af_netlink.c:2268
 __netlink_dump_start+0x3ec/0x4e0 net/netlink/af_netlink.c:2373
 genl_family_rcv_msg_dumpit net/netlink/genetlink.c:686 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:780 [inline]
 genl_rcv_msg+0x575/0x800 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2494
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x5df/0x6b0 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x6f8/0x7c0 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 ____sys_sendmsg+0x352/0x4c0 net/socket.c:2353
 ___sys_sendmsg net/socket.c:2407 [inline]
 __sys_sendmsg+0x1e2/0x260 net/socket.c:2440
 __do_sys_sendmsg net/socket.c:2449 [inline]
 __se_sys_sendmsg net/socket.c:2447 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2447
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15956 Comm: syz-executor.3 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================