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BUG: KCSAN: data-race in yama_relation_cleanup / yama_task_free

write to 0xffff88810a5e96d0 of 1 bytes by interrupt on cpu 0:
 yama_ptracer_del security/yama/yama_lsm.c:191 [inline]
 yama_task_free+0xc3/0x160 security/yama/yama_lsm.c:207
 security_task_free+0x3f/0xa0 security/security.c:1597
 __put_task_struct+0xc2/0x3a0 kernel/fork.c:736
 put_task_struct include/linux/sched/task.h:111 [inline]
 delayed_put_task_struct+0x4e/0x130 kernel/exit.c:172
 rcu_do_batch kernel/rcu/tree.c:2489 [inline]
 rcu_core+0x69b/0xb90 kernel/rcu/tree.c:2723
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2736
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x32/0x40 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu+0xb4/0xc0 kernel/softirq.c:420
 sysvec_apic_timer_interrupt+0x74/0x90 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
 native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
 arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
 kcsan_setup_watchpoint+0x1fc/0x4e0 kernel/kcsan/core.c:591
 vm_normal_page+0x7f/0x1b0 mm/memory.c:636
 copy_present_pte mm/memory.c:860 [inline]
 copy_pte_range+0x403/0x1ab0 mm/memory.c:978
 copy_pmd_range mm/memory.c:1058 [inline]
 copy_pud_range mm/memory.c:1095 [inline]
 copy_p4d_range mm/memory.c:1119 [inline]
 copy_page_range+0x85e/0xb30 mm/memory.c:1192
 dup_mmap+0x75e/0xa90 kernel/fork.c:594
 dup_mm+0x7c/0x210 kernel/fork.c:1361
 copy_mm kernel/fork.c:1417 [inline]
 copy_process+0x125c/0x2da0 kernel/fork.c:2099
 kernel_clone+0x14b/0x680 kernel/fork.c:2464
 __do_sys_clone kernel/fork.c:2581 [inline]
 __se_sys_clone kernel/fork.c:2565 [inline]
 __x64_sys_clone+0xc8/0xf0 kernel/fork.c:2565
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810a5e96d0 of 1 bytes by task 9788 on cpu 1:
 yama_relation_cleanup+0x69/0x150 security/yama/yama_lsm.c:122
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x635/0xb90 kernel/workqueue.c:2421
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9788 Comm: kworker/1:4 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events yama_relation_cleanup
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