toolchain: LLVM 12.0.0
config: defconfig + kcsan.config
==================================================================
BUG: KCSAN: data-race in __do_sys_prctl / do_task_stat

write to 0xffff222dd6518130 of 8 bytes by task 1857 on cpu 16:
 __do_sys_prctl+0xe20/0xe70
 __arm64_sys_prctl+0x68/0x80
 invoke_syscall+0x54/0x160
 el0_svc_common+0xc0/0x148
 do_el0_svc+0x38/0xa8
 el0_svc+0x20/0x50
 el0t_64_sync_handler+0x68/0xac
 el0t_64_sync+0x180/0x184

read to 0xffff222dd6518130 of 8 bytes by task 1 on cpu 15:
 do_task_stat+0xb7c/0xc30
 proc_tgid_stat+0x14/0x24
 proc_single_show+0x90/0x120
 seq_read_iter+0x218/0x6a4
 seq_read+0x188/0x1d8
 vfs_read+0x164/0x444
 ksys_read+0x9c/0x11c
 __arm64_sys_read+0x44/0x58
 invoke_syscall+0x54/0x160
 el0_svc_common+0x100/0x148
 do_el0_svc+0x38/0xa8
 el0_svc+0x20/0x50
 el0t_64_sync_handler+0x68/0xac
 el0t_64_sync+0x180/0x184

value changed: 0x0000ffffd66e5fdb -> 0x0000ffffb2c6400b

Reported by Kernel Concurrency Sanitizer on:
CPU: 15 PID: 1 Comm: systemd Not tainted 5.16.0-rc4-00002-g5854738642b4 #1
Hardware name: linux,dummy-virt (DT)
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