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BUG: KCSAN: data-race in yama_ptracer_del / yama_ptracer_del

write to 0xffff88809cb0ced0 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:1550
 __put_task_struct+0xcd/0x360 kernel/fork.c:751
 put_task_struct include/linux/sched/task.h:122 [inline]
 delayed_put_task_struct+0x1a5/0x1d0 kernel/exit.c:182
 rcu_do_batch kernel/rcu/tree.c:2207 [inline]
 rcu_core+0x533/0x9f0 kernel/rcu/tree.c:2434
 rcu_core_si+0x12/0x20 kernel/rcu/tree.c:2443
 __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:546 [inline]
 smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1146
 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]
 __sanitizer_cov_trace_pc+0x26/0x50 kernel/kcov.c:187
 page_ref_inc include/linux/page_ref.h:107 [inline]
 get_page include/linux/mm.h:1001 [inline]
 copy_one_pte mm/memory.c:790 [inline]
 copy_pte_range mm/memory.c:841 [inline]
 copy_pmd_range mm/memory.c:892 [inline]
 copy_pud_range mm/memory.c:926 [inline]
 copy_p4d_range mm/memory.c:948 [inline]
 copy_page_range+0xb77/0x1a00 mm/memory.c:1010
 dup_mmap kernel/fork.c:610 [inline]
 dup_mm+0x74a/0xba0 kernel/fork.c:1366
 copy_mm kernel/fork.c:1422 [inline]
 copy_process+0x39d7/0x3b40 kernel/fork.c:2087
 _do_fork+0xfe/0x7a0 kernel/fork.c:2436
 __do_sys_clone kernel/fork.c:2591 [inline]
 __se_sys_clone kernel/fork.c:2572 [inline]
 __x64_sys_clone+0x130/0x170 kernel/fork.c:2572
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88809cb0ced0 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:1550
 __put_task_struct+0xcd/0x360 kernel/fork.c:751
 put_task_struct include/linux/sched/task.h:122 [inline]
 delayed_put_task_struct+0x1a5/0x1d0 kernel/exit.c:182
 rcu_do_batch kernel/rcu/tree.c:2207 [inline]
 rcu_core+0x533/0x9f0 kernel/rcu/tree.c:2434
 rcu_core_si+0x12/0x20 kernel/rcu/tree.c:2443
 __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:546 [inline]
 smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1146
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 __tsan_func_exit+0x0/0x10 kernel/kcsan/core.c:707
 __list_add include/linux/list.h:67 [inline]
 list_add include/linux/list.h:86 [inline]
 anon_vma_chain_link+0x75/0x110 mm/rmap.c:144
 anon_vma_clone+0x12c/0x3c0 mm/rmap.c:299
 anon_vma_fork+0x7d/0x280 mm/rmap.c:352
 dup_mmap kernel/fork.c:565 [inline]
 dup_mm+0x71e/0xba0 kernel/fork.c:1366
 copy_mm kernel/fork.c:1422 [inline]
 copy_process+0x39d7/0x3b40 kernel/fork.c:2087
 _do_fork+0xfe/0x7a0 kernel/fork.c:2436
 __do_sys_clone kernel/fork.c:2591 [inline]
 __se_sys_clone kernel/fork.c:2572 [inline]
 __x64_sys_clone+0x130/0x170 kernel/fork.c:2572
 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: 0 PID: 7690 Comm: udevd Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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