==================================================================
BUG: KCSAN: data-race in exec_mmap / unmap_region

write to 0xffff8881064dd0b0 of 8 bytes by task 1475 on cpu 1:
 update_hiwater_rss include/linux/mm.h:2102 [inline]
 unmap_region+0x12b/0x1e0 mm/mmap.c:2648
 __do_munmap+0xeb5/0x1310 mm/mmap.c:2883
 __vm_munmap mm/mmap.c:2906 [inline]
 __do_sys_munmap+0x9f/0x160 mm/mmap.c:2932
 __se_sys_munmap mm/mmap.c:2928 [inline]
 __x64_sys_munmap+0x2d/0x40 mm/mmap.c:2928
 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 0xffff8881064dd0b0 of 8 bytes by task 16190 on cpu 0:
 get_mm_hiwater_rss include/linux/mm.h:2089 [inline]
 setmax_mm_hiwater_rss include/linux/mm.h:2119 [inline]
 exec_mmap+0x1e3/0x360 fs/exec.c:1026
 begin_new_exec+0x73e/0x12c0 fs/exec.c:1286
 load_elf_binary+0x54d/0x2750 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1723 [inline]
 exec_binprm+0x1d9/0x720 fs/exec.c:1764
 bprm_execve+0x3b5/0x520 fs/exec.c:1833
 do_execveat_common+0x63b/0x700 fs/exec.c:1922
 do_execve fs/exec.c:1990 [inline]
 __do_sys_execve fs/exec.c:2066 [inline]
 __se_sys_execve fs/exec.c:2061 [inline]
 __x64_sys_execve+0x56/0x70 fs/exec.c:2061
 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: 0x000000000000029f -> 0x00000000000002a0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16190 Comm: dhcpcd Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================