syzbot

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BUG: KCSAN: data-race in devlink_trap_stats_put / devlink_trap_stats_update

write to 0xffffe8ffffc75ee0 of 8 bytes by task 1041 on cpu 0:
 devlink_trap_stats_update+0x6c/0x80 net/core/devlink.c:8073
 devlink_trap_report+0xbb/0x1a0 net/core/devlink.c:8107
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:384 [inline]
 nsim_dev_trap_report_work+0x4c5/0x5a0 drivers/net/netdevsim/dev.c:412
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264
 worker_thread+0xa0/0x800 kernel/workqueue.c:2410
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffffe8ffffc75ee0 of 8 bytes by task 12581 on cpu 1:
 devlink_trap_stats_read net/core/devlink.c:5449 [inline]
 devlink_trap_stats_put+0x78/0x2b0 net/core/devlink.c:5464
 devlink_nl_trap_group_fill.isra.0+0x12e/0x220 net/core/devlink.c:5728
 devlink_nl_cmd_trap_group_get_dumpit+0x18e/0x250 net/core/devlink.c:5798
 genl_lock_dumpit+0x57/0x80 net/netlink/genetlink.c:534
 netlink_dump+0x315/0x800 net/netlink/af_netlink.c:2244
 __netlink_dump_start+0x402/0x530 net/netlink/af_netlink.c:2352
 genl_family_rcv_msg_dumpit net/netlink/genetlink.c:617 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:714 [inline]
 genl_rcv_msg+0x71f/0x900 net/netlink/genetlink.c:734
 netlink_rcv_skb+0xb0/0x260 net/netlink/af_netlink.c:2477
 genl_rcv+0x32/0x50 net/netlink/genetlink.c:745
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x3a6/0x4d0 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x4d3/0x8b0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:659
 ____sys_sendmsg+0x49d/0x4d0 net/socket.c:2330
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2384
 __sys_sendmsg+0xa0/0x160 net/socket.c:2417
 __do_sys_sendmsg net/socket.c:2426 [inline]
 __se_sys_sendmsg net/socket.c:2424 [inline]
 __x64_sys_sendmsg+0x51/0x70 net/socket.c:2424
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12581 Comm: syz-executor.4 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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