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BUG: KCSAN: data-race in yama_task_free / yama_task_free

write to 0xffff888019ff1290 of 1 bytes by interrupt on cpu 0:
 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:733
 put_task_struct include/linux/sched/task.h:113 [inline]
 delayed_put_task_struct+0x4b/0x150 kernel/exit.c:172
 rcu_do_batch kernel/rcu/tree.c:2430 [inline]
 rcu_core+0x5a6/0xb30 kernel/rcu/tree.c:2658
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2667
 __do_softirq+0x198/0x360 kernel/softirq.c:298
 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+0x5b/0x70 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu+0x115/0x120 kernel/softirq.c:423
 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:581
 clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:48
 clear_page arch/x86/include/asm/page_64.h:49 [inline]
 clear_highpage include/linux/highmem.h:283 [inline]
 kernel_init_free_pages mm/page_alloc.c:1163 [inline]
 prep_new_page+0xa8/0x240 mm/page_alloc.c:2228
 get_page_from_freelist+0x391/0x500 mm/page_alloc.c:3831
 __alloc_pages_nodemask+0x19c/0x380 mm/page_alloc.c:4882
 __alloc_pages include/linux/gfp.h:509 [inline]
 __alloc_pages_node include/linux/gfp.h:522 [inline]
 alloc_pages_vma+0x718/0x890 mm/mempolicy.c:2219
 do_huge_pmd_anonymous_page+0x5dd/0x870 mm/huge_memory.c:748
 create_huge_pmd mm/memory.c:4282 [inline]
 __handle_mm_fault mm/memory.c:4506 [inline]
 handle_mm_fault+0xfd0/0x1af0 mm/memory.c:4633
 do_user_addr_fault+0x380/0x770 arch/x86/mm/fault.c:1372
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538

read to 0xffff888019ff1290 of 1 bytes by interrupt on cpu 1:
 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:733
 put_task_struct include/linux/sched/task.h:113 [inline]
 delayed_put_task_struct+0x4b/0x150 kernel/exit.c:172
 rcu_do_batch kernel/rcu/tree.c:2430 [inline]
 rcu_core+0x5a6/0xb30 kernel/rcu/tree.c:2658
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2667
 __do_softirq+0x198/0x360 kernel/softirq.c:298
 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+0x5b/0x70 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu+0x115/0x120 kernel/softirq.c:423
 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:581
 preempt_count arch/x86/include/asm/preempt.h:26 [inline]
 get_ctx kernel/kcsan/core.c:193 [inline]
 check_access kernel/kcsan/core.c:601 [inline]
 __tsan_read8+0xf0/0x180 kernel/kcsan/core.c:801
 in_x32_syscall arch/x86/include/asm/compat.h:197 [inline]
 in_32bit_syscall arch/x86/include/asm/compat.h:205 [inline]
 in_compat_syscall arch/x86/include/asm/compat.h:211 [inline]
 get_timespec64+0xa1/0x110 kernel/time/time.c:794
 __do_sys_nanosleep kernel/time/hrtimer.c:1962 [inline]
 __se_sys_nanosleep+0x32/0x2a0 kernel/time/hrtimer.c:1957
 __x64_sys_nanosleep+0x2d/0x40 kernel/time/hrtimer.c:1957
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8717 Comm: syz-executor.1 Not tainted 5.9.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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