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BUG: KCSAN: data-race in yama_task_free / yama_task_free

write to 0xffff88810a5ce950 of 1 bytes by interrupt on cpu 0:
 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+0x4e/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
 is_atomic kernel/kcsan/core.c:234 [inline]
 should_watch kernel/kcsan/core.c:262 [inline]
 check_access kernel/kcsan/core.c:631 [inline]
 __tsan_read1+0x116/0x180 kernel/kcsan/core.c:839
 tomoyo_check_acl+0x6a/0x200 security/tomoyo/domain.c:173
 tomoyo_path_permission security/tomoyo/file.c:586 [inline]
 tomoyo_path_perm+0x22f/0x330 security/tomoyo/file.c:838
 tomoyo_path_unlink+0x43/0x60 security/tomoyo/tomoyo.c:150
 security_path_unlink+0x82/0xd0 security/security.c:1101
 do_unlinkat+0x231/0x4d0 fs/namei.c:3894
 __do_sys_unlink fs/namei.c:3943 [inline]
 __se_sys_unlink fs/namei.c:3941 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3941
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810a5ce950 of 1 bytes by interrupt on cpu 1:
 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+0x4e/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
 is_atomic kernel/kcsan/core.c:234 [inline]
 should_watch kernel/kcsan/core.c:262 [inline]
 check_access kernel/kcsan/core.c:631 [inline]
 __tsan_read2+0x11a/0x180 kernel/kcsan/core.c:840
 vmx_read_guest_seg_selector+0xfb/0x150 arch/x86/kvm/vmx/vmx.c:780
 vmx_get_segment+0xcb/0x230 arch/x86/kvm/vmx/vmx.c:3190
 kvm_get_segment arch/x86/kvm/x86.c:5846 [inline]
 emulator_get_segment+0x59/0x230 arch/x86/kvm/x86.c:6649
 x86_decode_insn+0x1f5/0x2b70 arch/x86/kvm/emulate.c:5216
 x86_emulate_instruction+0x215/0x2ac0 arch/x86/kvm/x86.c:7317
 kvm_mmu_page_fault+0x315/0x3c0 arch/x86/kvm/mmu/mmu.c:5097
 handle_ept_violation+0x277/0x350 arch/x86/kvm/vmx/vmx.c:5357
 vmx_handle_exit+0x2fd/0x7e0 arch/x86/kvm/vmx/vmx.c:6068
 vcpu_enter_guest+0x1978/0x2390 arch/x86/kvm/x86.c:9025
 vcpu_run+0x26e/0x730 arch/x86/kvm/x86.c:9090
 kvm_arch_vcpu_ioctl_run+0x362/0x660 arch/x86/kvm/x86.c:9307
 kvm_vcpu_ioctl+0x562/0x8f0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3234
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 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: 13032 Comm: syz-executor.5 Not tainted 5.10.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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