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BUG: KCSAN: data-race in yama_task_free / yama_task_free

write to 0xffff88809436be10 of 1 bytes by interrupt on cpu 1:
 yama_ptracer_del security/yama/yama_lsm.c:191 [inline]
 yama_task_free+0xc6/0x150 security/yama/yama_lsm.c:207
 security_task_free+0x3f/0xa0 security/security.c:1595
 __put_task_struct+0x96/0x370 kernel/fork.c:750
 put_task_struct include/linux/sched/task.h:126 [inline]
 delayed_put_task_struct+0x52/0x160 kernel/exit.c:172
 rcu_do_batch kernel/rcu/tree.c:2414 [inline]
 rcu_core+0x576/0xac0 kernel/rcu/tree.c:2641
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2650
 __do_softirq+0x198/0x360 kernel/softirq.c:292
 run_ksoftirqd+0x2f/0x60 kernel/softirq.c:630
 smpboot_thread_fn+0x347/0x530 kernel/smpboot.c:165
 kthread+0x20d/0x230 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

read to 0xffff88809436be10 of 1 bytes by interrupt on cpu 0:
 yama_ptracer_del security/yama/yama_lsm.c:187 [inline]
 yama_task_free+0x61/0x150 security/yama/yama_lsm.c:207
 security_task_free+0x3f/0xa0 security/security.c:1595
 __put_task_struct+0x96/0x370 kernel/fork.c:750
 put_task_struct include/linux/sched/task.h:126 [inline]
 delayed_put_task_struct+0x52/0x160 kernel/exit.c:172
 rcu_do_batch kernel/rcu/tree.c:2414 [inline]
 rcu_core+0x576/0xac0 kernel/rcu/tree.c:2641
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2650
 __do_softirq+0x198/0x360 kernel/softirq.c:292
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x5d/0x80 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:387 [inline]
 __irq_exit_rcu+0x115/0x120 kernel/softirq.c:417
 sysvec_apic_timer_interrupt+0xba/0xd0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23753 Comm: syz-executor.0 Not tainted 5.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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