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BUG: KCSAN: data-race in getrusage / unmap_region

write to 0xffff88811468cb68 of 8 bytes by task 6322 on cpu 1:
 update_hiwater_rss include/linux/mm.h:2670 [inline]
 unmap_region+0x105/0x230 mm/mmap.c:2435
 do_vmi_align_munmap+0x6df/0xa60 mm/mmap.c:2754
 do_vmi_munmap+0x1fb/0x250 mm/mmap.c:2830
 do_munmap+0x7a/0xb0 mm/mmap.c:2846
 mremap_to mm/mremap.c:924 [inline]
 __do_sys_mremap mm/mremap.c:1076 [inline]
 __se_sys_mremap+0xab6/0xf10 mm/mremap.c:993
 __x64_sys_mremap+0x67/0x80 mm/mremap.c:993
 x64_sys_call+0x2747/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:26
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811468cb68 of 8 bytes by task 6327 on cpu 0:
 get_mm_hiwater_rss include/linux/mm.h:2657 [inline]
 setmax_mm_hiwater_rss include/linux/mm.h:2687 [inline]
 getrusage+0xa35/0xb90 kernel/sys.c:1870
 io_sq_thread+0x544/0x1000 io_uring/sqpoll.c:316
 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: 0x0000000000000e9a -> 0x0000000000001083

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 6327 Comm: iou-sqp-6322 Not tainted 6.11.0-syzkaller-04557-g2f27fce67173 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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