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BUG: KCSAN: data-race in __do_munmap / task_mem

write to 0xffff8881b9793ce0 of 8 bytes by task 14827 on cpu 1:
 vm_stat_account mm/mmap.c:3376 [inline]
 remove_vma_list mm/mmap.c:2658 [inline]
 __do_munmap+0x104f/0x1340 mm/mmap.c:2915
 __vm_munmap+0x9b/0x160 mm/mmap.c:2935
 __do_sys_munmap mm/mmap.c:2961 [inline]
 __se_sys_munmap mm/mmap.c:2957 [inline]
 __x64_sys_munmap+0x3d/0x50 mm/mmap.c:2957
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881b9793ce0 of 8 bytes by task 1031 on cpu 0:
 task_mem+0x2df/0x3d0 fs/proc/task_mmu.c:68
 proc_pid_status+0x80b/0x13c0 fs/proc/array.c:448
 proc_single_show+0x84/0x100 fs/proc/base.c:774
 seq_read_iter+0x2ef/0x910 fs/seq_file.c:227
 seq_read+0x221/0x260 fs/seq_file.c:159
 vfs_read+0x154/0x5d0 fs/read_write.c:494
 ksys_read+0xce/0x180 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:642
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000058 -> 0x0000000000000057

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1031 Comm: systemd-journal Not tainted 5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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