syzbot

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BUG: KCSAN: data-race in exec_mmap / unmap_region

write to 0xffff888103bcc4a8 of 8 bytes by task 1466 on cpu 1:
 update_hiwater_rss include/linux/mm.h:2127 [inline]
 unmap_region+0x10c/0x1d0 mm/mmap.c:2184
 do_mas_align_munmap+0x4fc/0x9b0 mm/mmap.c:2441
 do_mas_munmap+0x1df/0x210 mm/mmap.c:2499
 __vm_munmap+0xe4/0x1b0 mm/mmap.c:2776
 __do_sys_munmap mm/mmap.c:2801 [inline]
 __se_sys_munmap mm/mmap.c:2798 [inline]
 __x64_sys_munmap+0x32/0x40 mm/mmap.c:2798
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888103bcc4a8 of 8 bytes by task 2691 on cpu 0:
 get_mm_hiwater_rss include/linux/mm.h:2114 [inline]
 setmax_mm_hiwater_rss include/linux/mm.h:2144 [inline]
 exec_mmap+0x19c/0x310 fs/exec.c:1033
 begin_new_exec+0x7a4/0xfc0 fs/exec.c:1294
 load_elf_binary+0x637/0x1980 fs/binfmt_elf.c:1002
 search_binary_handler fs/exec.c:1727 [inline]
 exec_binprm+0x1d9/0x800 fs/exec.c:1768
 bprm_execve+0x379/0x4e0 fs/exec.c:1837
 do_execveat_common+0x843/0x950 fs/exec.c:1942
 do_execve fs/exec.c:2016 [inline]
 __do_sys_execve fs/exec.c:2092 [inline]
 __se_sys_execve fs/exec.c:2087 [inline]
 __x64_sys_execve+0x56/0x70 fs/exec.c:2087
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000000002b1 -> 0x00000000000002b2

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2691 Comm: dhcpcd Not tainted 6.1.0-rc7-syzkaller-00211-g0ba09b173387-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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