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

write to 0xffff1fab168fa2b0 of 8 bytes by task 1874 on cpu 120:
 sigprocmask+0x140/0x198
 __arm64_sys_rt_sigprocmask+0x11c/0x20c
 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 0xffff1fab168fa2b0 of 8 bytes by task 1 on cpu 117:
 do_task_stat+0x9dc/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: 0x7be3c0fe28014a03 -> 0x0000000000000000
  
Reported by Kernel Concurrency Sanitizer on:
CPU: 117 PID: 1 Comm: systemd Not tainted 5.16.0-rc4-00002-g5854738642b4 #1
Hardware name: linux,dummy-virt (DT)
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