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BUG: KCSAN: data-race in yama_task_free / yama_task_free

write to 0xffff888107795d90 of 1 bytes by interrupt on cpu 1:
 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:1596
 __put_task_struct+0xc2/0x3a0 kernel/fork.c:735
 put_task_struct include/linux/sched/task.h:113 [inline]
 delayed_put_task_struct+0x49/0x130 kernel/exit.c:172
 rcu_do_batch kernel/rcu/tree.c:2476 [inline]
 rcu_core+0x6bb/0xbc0 kernel/rcu/tree.c:2711
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2724
 __do_softirq+0x12c/0x2b1 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+0x32/0x40 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu+0xb2/0xc0 kernel/softirq.c:423
 sysvec_apic_timer_interrupt+0x74/0x90 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
 __tsan_read4+0x0/0x180 kernel/kcsan/core.c:632
 devcgroup_inode_permission include/linux/device_cgroup.h:21 [inline]
 inode_permission+0x8c/0x320 fs/namei.c:467
 may_lookup fs/namei.c:1575 [inline]
 link_path_walk+0x178/0x710 fs/namei.c:2126
 path_lookupat+0x7b/0x550 fs/namei.c:2333
 filename_lookup+0xf2/0x380 fs/namei.c:2367
 user_path_at_empty+0x3b/0x50 fs/namei.c:2647
 user_path_at include/linux/namei.h:59 [inline]
 vfs_statx+0x90/0x270 fs/stat.c:185
 vfs_fstatat fs/stat.c:207 [inline]
 vfs_lstat include/linux/fs.h:3125 [inline]
 __do_sys_newlstat fs/stat.c:362 [inline]
 __se_sys_newlstat+0x46/0x250 fs/stat.c:356
 __x64_sys_newlstat+0x2d/0x40 fs/stat.c:356
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888107795d90 of 1 bytes by interrupt on cpu 0:
 yama_ptracer_del security/yama/yama_lsm.c:187 [inline]
 yama_task_free+0x5c/0x160 security/yama/yama_lsm.c:207
 security_task_free+0x3f/0xa0 security/security.c:1596
 __put_task_struct+0xc2/0x3a0 kernel/fork.c:735
 put_task_struct include/linux/sched/task.h:113 [inline]
 delayed_put_task_struct+0x49/0x130 kernel/exit.c:172
 rcu_do_batch kernel/rcu/tree.c:2476 [inline]
 rcu_core+0x6bb/0xbc0 kernel/rcu/tree.c:2711
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2724
 __do_softirq+0x12c/0x2b1 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+0x32/0x40 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu+0xb2/0xc0 kernel/softirq.c:423
 sysvec_apic_timer_interrupt+0x74/0x90 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11942 Comm: modprobe Not tainted 5.10.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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