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BUG: KCSAN: data-race in yama_task_free / yama_task_free

write to 0xffff8880854ee0d0 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
 run_ksoftirqd+0x2f/0x60 kernel/softirq.c:652
 smpboot_thread_fn+0x347/0x530 kernel/smpboot.c:165
 kthread+0x20d/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff8880854ee0d0 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
 arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline]
 kcsan_setup_watchpoint+0x44b/0x4a0 kernel/kcsan/core.c:563
 ext4_raw_inode fs/ext4/ext4.h:2278 [inline]
 ext4_do_update_inode fs/ext4/inode.c:4957 [inline]
 ext4_mark_iloc_dirty+0xf6/0x1660 fs/ext4/inode.c:5624
 __ext4_mark_inode_dirty+0x448/0x630 fs/ext4/inode.c:5818
 ext4_evict_inode+0x91d/0xc20 fs/ext4/inode.c:273
 evict+0x19f/0x470 fs/inode.c:576
 iput_final fs/inode.c:1652 [inline]
 iput+0x44a/0x550 fs/inode.c:1678
 do_unlinkat+0x2c9/0x4d0 fs/namei.c:3902
 __do_sys_unlink fs/namei.c:3942 [inline]
 __se_sys_unlink fs/namei.c:3940 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3940
 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: 12339 Comm: syz-executor.3 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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