syzbot

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BUG: KCSAN: data-race in insert_work / wq_worker_running

read-write to 0xffff888237c2c9a4 of 4 bytes by task 902 on cpu 0:
 wq_worker_running+0x98/0x120 kernel/workqueue.c:1071
 schedule_timeout+0xcc/0x230 kernel/time/timer.c:2167
 schedule_timeout_uninterruptible kernel/time/timer.c:2201 [inline]
 msleep+0x52/0x70 kernel/time/timer.c:2322
 nsim_fib6_rt_add drivers/net/netdevsim/fib.c:693 [inline]
 nsim_fib6_rt_insert drivers/net/netdevsim/fib.c:759 [inline]
 nsim_fib6_event drivers/net/netdevsim/fib.c:856 [inline]
 nsim_fib_event drivers/net/netdevsim/fib.c:889 [inline]
 nsim_fib_event_work+0x1fee/0x2250 drivers/net/netdevsim/fib.c:1492
 process_one_work+0x434/0x860 kernel/workqueue.c:2600
 process_scheduled_works kernel/workqueue.c:2667 [inline]
 worker_thread+0x79a/0xa10 kernel/workqueue.c:2753
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

read to 0xffff888237c2c9a4 of 4 bytes by task 3261 on cpu 1:
 __need_more_worker kernel/workqueue.c:830 [inline]
 insert_work+0x10e/0x190 kernel/workqueue.c:1563
 __queue_work+0x722/0x980 kernel/workqueue.c:1717
 queue_work_on+0x95/0xf0 kernel/workqueue.c:1747
 srcu_queue_delayed_work_on kernel/rcu/srcutree.c:808 [inline]
 srcu_schedule_cbs_sdp kernel/rcu/srcutree.c:821 [inline]
 srcu_gp_end kernel/rcu/srcutree.c:889 [inline]
 srcu_advance_state kernel/rcu/srcutree.c:1671 [inline]
 process_srcu+0x710/0xae0 kernel/rcu/srcutree.c:1769
 process_one_work+0x434/0x860 kernel/workqueue.c:2600
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2751
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3261 Comm: kworker/1:8 Not tainted 6.5.0-syzkaller-09276-g99d99825fc07 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: rcu_gp process_srcu
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