================================================================== BUG: KCSAN: data-race in yama_task_free / yama_task_free write to 0xffff8880622c3a90 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:1597 __put_task_struct+0xc2/0x3a0 kernel/fork.c:736 put_task_struct include/linux/sched/task.h:111 [inline] delayed_put_task_struct+0x4e/0x130 kernel/exit.c:173 rcu_do_batch kernel/rcu/tree.c:2489 [inline] rcu_core+0x6a7/0xb80 kernel/rcu/tree.c:2723 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2736 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343 run_ksoftirqd+0x13/0x20 kernel/softirq.c:650 smpboot_thread_fn+0x34f/0x520 kernel/smpboot.c:165 kthread+0x20b/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff8880622c3a90 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:1597 __put_task_struct+0xc2/0x3a0 kernel/fork.c:736 put_task_struct include/linux/sched/task.h:111 [inline] delayed_put_task_struct+0x4e/0x130 kernel/exit.c:173 rcu_do_batch kernel/rcu/tree.c:2489 [inline] rcu_core+0x6a7/0xb80 kernel/rcu/tree.c:2723 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2736 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343 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:226 [inline] __irq_exit_rcu+0xb4/0xc0 kernel/softirq.c:420 sysvec_apic_timer_interrupt+0x74/0x90 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 get_current kernel/kcov.c:319 [inline] write_comp_data kernel/kcov.c:217 [inline] __sanitizer_cov_trace_switch+0x56/0x100 kernel/kcov.c:320 do_vfs_ioctl+0x4a/0xec0 fs/ioctl.c:673 __do_sys_ioctl fs/ioctl.c:751 [inline] __se_sys_ioctl+0x83/0x140 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: 0 PID: 17262 Comm: syz-executor.0 Not tainted 5.11.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================