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BUG: KCSAN: data-race in getrusage / unmap_region

write to 0xffff888100056af0 of 8 bytes by task 25341 on cpu 1:
 update_hiwater_rss include/linux/mm.h:2655 [inline]
 unmap_region+0x105/0x230 mm/mmap.c:2309
 do_vmi_align_munmap+0x650/0x9c0 mm/mmap.c:2628
 do_vmi_munmap+0x1eb/0x230 mm/mmap.c:2696
 __vm_munmap+0xe7/0x1d0 mm/mmap.c:2972
 __do_sys_munmap mm/mmap.c:2989 [inline]
 __se_sys_munmap mm/mmap.c:2986 [inline]
 __x64_sys_munmap+0x36/0x40 mm/mmap.c:2986
 x64_sys_call+0xc9d/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:12
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888100056af0 of 8 bytes by task 25342 on cpu 0:
 get_mm_hiwater_rss include/linux/mm.h:2642 [inline]
 setmax_mm_hiwater_rss include/linux/mm.h:2672 [inline]
 getrusage+0xa35/0xb90 kernel/sys.c:1861
 io_sq_thread+0x4d3/0xef0 io_uring/sqpoll.c:305
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x0000000000000860 -> 0x0000000000000940

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25342 Comm: iou-sqp-25341 Tainted: G        W          6.9.0-rc5-syzkaller-00036-g9d1ddab261f3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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