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BUG: KCSAN: data-race in yama_ptracer_del / yama_ptracer_del

write to 0xffff8880a08a5850 of 1 bytes by interrupt on cpu 0:
 yama_ptracer_del+0x117/0x1a0 security/yama/yama_lsm.c:191
 yama_task_free+0x1e/0x30 security/yama/yama_lsm.c:207
 security_task_free+0x3f/0xa0 security/security.c:1550
 __put_task_struct+0xc3/0x350 kernel/fork.c:751
 put_task_struct include/linux/sched/task.h:122 [inline]
 delayed_put_task_struct+0x19b/0x1c0 kernel/exit.c:182
 rcu_do_batch kernel/rcu/tree.c:2239 [inline]
 rcu_core+0x533/0x9f0 kernel/rcu/tree.c:2466
 rcu_core_si+0x12/0x20 kernel/rcu/tree.c:2475
 __do_softirq+0x118/0x34a kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xb5/0xd0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0xe2/0x270 arch/x86/kernel/apic/apic.c:1146
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 __sanitizer_cov_trace_cmp8+0xf/0x20 kernel/kcov.c:254
 timestamp_truncate+0x8b/0x160 fs/inode.c:2174
 current_time+0x5d/0xc0 fs/inode.c:2211
 add_dirent_to_buf+0x161/0x390 fs/ext4/namei.c:2027
 ext4_add_entry+0x37c/0x8e0 fs/ext4/namei.c:2233
 ext4_add_nondir+0x59/0x170 fs/ext4/namei.c:2569
 ext4_symlink+0x63e/0x9e0 fs/ext4/namei.c:3356
 vfs_symlink fs/namei.c:4201 [inline]
 vfs_symlink+0x216/0x310 fs/namei.c:4187
 do_symlinkat+0x1ac/0x1e0 fs/namei.c:4228
 __do_sys_symlink fs/namei.c:4247 [inline]
 __se_sys_symlink fs/namei.c:4245 [inline]
 __x64_sys_symlink+0x3c/0x50 fs/namei.c:4245
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a08a5850 of 1 bytes by interrupt on cpu 1:
 yama_ptracer_del+0xd4/0x1a0 security/yama/yama_lsm.c:187
 yama_task_free+0x1e/0x30 security/yama/yama_lsm.c:207
 security_task_free+0x3f/0xa0 security/security.c:1550
 __put_task_struct+0xc3/0x350 kernel/fork.c:751
 put_task_struct include/linux/sched/task.h:122 [inline]
 delayed_put_task_struct+0x19b/0x1c0 kernel/exit.c:182
 rcu_do_batch kernel/rcu/tree.c:2239 [inline]
 rcu_core+0x533/0x9f0 kernel/rcu/tree.c:2466
 rcu_core_si+0x12/0x20 kernel/rcu/tree.c:2475
 __do_softirq+0x118/0x34a kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xb5/0xd0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0xe2/0x270 arch/x86/kernel/apic/apic.c:1146
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:48
 clear_page arch/x86/include/asm/page_64.h:49 [inline]
 clear_highpage include/linux/highmem.h:214 [inline]
 kernel_init_free_pages+0x61/0xa0 mm/page_alloc.c:1118
 prep_new_page+0x58/0x100 mm/page_alloc.c:2160
 get_page_from_freelist+0x1391/0x1640 mm/page_alloc.c:3684
 __alloc_pages_nodemask+0x15e/0x310 mm/page_alloc.c:4731
 __alloc_pages include/linux/gfp.h:496 [inline]
 __alloc_pages_node include/linux/gfp.h:509 [inline]
 alloc_pages_vma+0x29b/0x390 mm/mempolicy.c:2155
 do_huge_pmd_anonymous_page+0x2af/0x1000 mm/huge_memory.c:771
 create_huge_pmd mm/memory.c:3924 [inline]
 __handle_mm_fault+0x1cc8/0x2cf0 mm/memory.c:4134
 handle_mm_fault+0x21c/0x540 mm/memory.c:4200
 do_user_addr_fault arch/x86/mm/fault.c:1442 [inline]
 do_page_fault+0x4a4/0xa52 arch/x86/mm/fault.c:1517
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11060 Comm: syz-executor.0 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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