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BUG: KCSAN: data-race in yama_task_free / yama_task_free

write to 0xffff88810dd02550 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:1610
 __put_task_struct+0xc2/0x3a0 kernel/fork.c:736
 put_task_struct include/linux/sched/task.h:113 [inline]
 delayed_put_task_struct+0x49/0x130 kernel/exit.c:173
 rcu_do_batch kernel/rcu/tree.c:2559 [inline]
 rcu_core+0x6e3/0xc70 kernel/rcu/tree.c:2794
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2807
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu+0xb4/0xc0 kernel/softirq.c:422
 sysvec_apic_timer_interrupt+0x6e/0x80 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
 smap_restore arch/x86/include/asm/smap.h:71 [inline]
 kcsan_setup_watchpoint+0x436/0x470 kernel/kcsan/core.c:590
 zap_pte_range+0x178/0x13f0 mm/memory.c:1239
 zap_pmd_range mm/memory.c:1380 [inline]
 zap_pud_range mm/memory.c:1409 [inline]
 zap_p4d_range mm/memory.c:1430 [inline]
 unmap_page_range+0x540/0x650 mm/memory.c:1451
 unmap_single_vma+0x157/0x210 mm/memory.c:1496
 unmap_vmas+0xc0/0x170 mm/memory.c:1528
 exit_mmap+0x1be/0x400 mm/mmap.c:3218
 __mmput+0xa2/0x220 kernel/fork.c:1082
 mmput+0x3d/0x50 kernel/fork.c:1103
 exit_mm+0x344/0x430 kernel/exit.c:501
 do_exit+0x3ff/0x1670 kernel/exit.c:812
 do_group_exit+0x17d/0x180 kernel/exit.c:922
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:933
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:931
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:931
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810dd02550 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:1610
 __put_task_struct+0xc2/0x3a0 kernel/fork.c:736
 put_task_struct include/linux/sched/task.h:113 [inline]
 delayed_put_task_struct+0x49/0x130 kernel/exit.c:173
 rcu_do_batch kernel/rcu/tree.c:2559 [inline]
 rcu_core+0x6e3/0xc70 kernel/rcu/tree.c:2794
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2807
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu+0xb4/0xc0 kernel/softirq.c:422
 sysvec_apic_timer_interrupt+0x6e/0x80 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
 memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:63
 slab_alloc mm/slab.c:3322 [inline]
 kmem_cache_alloc+0x197/0x320 mm/slab.c:3502
 getname_flags+0x84/0x3d0 fs/namei.c:138
 getname fs/namei.c:209 [inline]
 user_path_create fs/namei.c:3654 [inline]
 do_symlinkat+0x59/0x2b0 fs/namei.c:4196
 __do_sys_symlink fs/namei.c:4227 [inline]
 __se_sys_symlink fs/namei.c:4225 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4225
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13084 Comm: syz-executor.0 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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