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BUG: KCSAN: data-race in exec_mmap / unmap_region

write to 0xffff8881018230b0 of 8 bytes by task 1476 on cpu 0:
 update_hiwater_rss include/linux/mm.h:2063 [inline]
 unmap_region+0x12b/0x1e0 mm/mmap.c:2655
 __do_munmap+0xeb5/0x1310 mm/mmap.c:2890
 __vm_munmap mm/mmap.c:2913 [inline]
 __do_sys_munmap+0x97/0x150 mm/mmap.c:2938
 __se_sys_munmap mm/mmap.c:2935 [inline]
 __x64_sys_munmap+0x2d/0x40 mm/mmap.c:2935
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881018230b0 of 8 bytes by task 2629 on cpu 1:
 get_mm_hiwater_rss include/linux/mm.h:2050 [inline]
 setmax_mm_hiwater_rss include/linux/mm.h:2080 [inline]
 exec_mmap+0x1e3/0x360 fs/exec.c:1027
 begin_new_exec+0x863/0x1430 fs/exec.c:1288
 load_elf_binary+0x539/0x26d0 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1727 [inline]
 exec_binprm+0x1d9/0x720 fs/exec.c:1768
 bprm_execve+0x3b5/0x520 fs/exec.c:1837
 do_execveat_common+0x63b/0x700 fs/exec.c:1926
 do_execve fs/exec.c:1994 [inline]
 __do_sys_execve fs/exec.c:2070 [inline]
 __se_sys_execve fs/exec.c:2065 [inline]
 __x64_sys_execve+0x56/0x70 fs/exec.c:2065
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000000002ab -> 0x00000000000002ae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2629 Comm: dhcpcd Not tainted 5.17.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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