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BUG: KCSAN: data-race in insert_work / wq_worker_running

read-write to 0xffff888237c2a7e0 of 4 bytes by task 1920 on cpu 0:
 wq_worker_running+0x96/0xe0 kernel/workqueue.c:880
 schedule_timeout+0xc1/0x290 kernel/time/timer.c:1884
 synchronize_rcu_expedited_wait_once kernel/rcu/tree_exp.h:472 [inline]
 synchronize_rcu_expedited_wait+0x1aa/0xac0 kernel/rcu/tree_exp.h:523
 rcu_exp_wait_wake kernel/rcu/tree_exp.h:588 [inline]
 rcu_exp_sel_wait_wake+0x355/0x660 kernel/rcu/tree_exp.h:622
 wait_rcu_exp_gp+0x1a/0x20 kernel/rcu/tree_exp.h:633
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffff888237c2a7e0 of 4 bytes by task 2315 on cpu 1:
 __need_more_worker kernel/workqueue.c:785 [inline]
 insert_work+0x10e/0x190 kernel/workqueue.c:1365
 __queue_work+0x69e/0x8e0 kernel/workqueue.c:1517
 queue_work_on+0x7e/0xe0 kernel/workqueue.c:1545
 queue_work include/linux/workqueue.h:502 [inline]
 schedule_work include/linux/workqueue.h:563 [inline]
 __xfrm_state_destroy net/xfrm/xfrm_state.c:674 [inline]
 xfrm_state_put include/net/xfrm.h:789 [inline]
 xfrm_state_find+0x1521/0x1b80 net/xfrm/xfrm_state.c:1205
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2393 [inline]
 xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2438 [inline]
 xfrm_resolve_and_create_bundle+0x522/0x1bf0 net/xfrm/xfrm_policy.c:2728
 xfrm_lookup_with_ifid+0x3be/0x1880 net/xfrm/xfrm_policy.c:3062
 xfrm_lookup net/xfrm/xfrm_policy.c:3191 [inline]
 xfrm_lookup_route+0x37/0x100 net/xfrm/xfrm_policy.c:3202
 ip_route_output_flow+0x123/0x160 net/ipv4/route.c:2874
 udp_sendmsg+0xd8b/0x1200 net/ipv4/udp.c:1220
 inet_sendmsg+0x5f/0x80 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 ____sys_sendmsg+0x38f/0x500 net/socket.c:2413
 ___sys_sendmsg net/socket.c:2467 [inline]
 __sys_sendmmsg+0x27c/0x4a0 net/socket.c:2553
 __do_sys_sendmmsg net/socket.c:2582 [inline]
 __se_sys_sendmmsg net/socket.c:2579 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2579
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2315 Comm: syz-executor.1 Not tainted 5.18.0-rc4-syzkaller-00083-g259b897e5a79-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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syz-executor.1 (2315) used greatest stack depth: 10560 bytes left