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BUG: KCSAN: data-race in yama_ptracer_del / yama_ptracer_del

read to 0xffff888035ed2d10 of 1 bytes by interrupt on cpu 0:
 yama_ptracer_del+0xd6/0x1a0 security/yama/yama_lsm.c:187
 yama_task_free+0x22/0x30 security/yama/yama_lsm.c:207
 security_task_free+0x43/0xa0 security/security.c:1518
 __put_task_struct+0xcd/0x360 kernel/fork.c:745
 put_task_struct include/linux/sched/task.h:122 [inline]
 delayed_put_task_struct+0x1a5/0x1d0 kernel/exit.c:182
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch+0x256/0x5b0 kernel/rcu/tree.c:2183
 rcu_core+0x365/0x4c0 kernel/rcu/tree.c:2408
 rcu_core_si+0x12/0x20 kernel/rcu/tree.c:2417
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xbb/0xe0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 __read_once_size include/linux/compiler.h:232 [inline]
 check_kcov_mode kernel/kcov.c:155 [inline]
 write_comp_data+0x1e/0x70 kernel/kcov.c:208
 compound_head include/linux/page-flags.h:176 [inline]
 set_page_dirty+0x70/0x2b0 mm/page-writeback.c:2553
 zap_pte_range mm/memory.c:1073 [inline]
 zap_pmd_range mm/memory.c:1184 [inline]
 zap_pud_range mm/memory.c:1213 [inline]
 zap_p4d_range mm/memory.c:1234 [inline]
 unmap_page_range+0x13ad/0x1940 mm/memory.c:1255
 unmap_single_vma+0x144/0x200 mm/memory.c:1300
 unmap_vmas+0xda/0x1a0 mm/memory.c:1332
 exit_mmap+0x13e/0x300 mm/mmap.c:3140
 __mmput kernel/fork.c:1082 [inline]
 mmput+0xea/0x280 kernel/fork.c:1103
 exit_mm kernel/exit.c:485 [inline]
 do_exit+0x4ac/0x18c0 kernel/exit.c:784
 do_group_exit+0xb4/0x1c0 kernel/exit.c:895
 __do_sys_exit_group kernel/exit.c:906 [inline]
 __se_sys_exit_group kernel/exit.c:904 [inline]
 __x64_sys_exit_group+0x2e/0x30 kernel/exit.c:904
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888035ed2d10 of 1 bytes by interrupt on cpu 1:
 yama_ptracer_del+0x119/0x1a0 security/yama/yama_lsm.c:191
 yama_task_free+0x22/0x30 security/yama/yama_lsm.c:207
 security_task_free+0x43/0xa0 security/security.c:1518
 __put_task_struct+0xcd/0x360 kernel/fork.c:745
 put_task_struct include/linux/sched/task.h:122 [inline]
 delayed_put_task_struct+0x1a5/0x1d0 kernel/exit.c:182
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch+0x256/0x5b0 kernel/rcu/tree.c:2183
 rcu_core+0x365/0x4c0 kernel/rcu/tree.c:2408
 rcu_core_si+0x12/0x20 kernel/rcu/tree.c:2417
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xbb/0xe0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 __read_once_size+0x6/0xe0 include/linux/compiler.h:230
 wait_consider_task+0x55/0x1c60 kernel/exit.c:1261
 do_wait_thread kernel/exit.c:1370 [inline]
 do_wait+0x1c9/0x4c0 kernel/exit.c:1441
 kernel_wait4+0x156/0x240 kernel/exit.c:1613
 __do_sys_wait4+0xea/0x100 kernel/exit.c:1625
 __se_sys_wait4 kernel/exit.c:1621 [inline]
 __x64_sys_wait4+0x5e/0x80 kernel/exit.c:1621
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8510 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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