syzbot

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BUG: KCSAN: data-race in lock_vma_under_rcu / vma_prepare

read to 0xffff88813f4398b0 of 4 bytes by task 24749 on cpu 0:
 vma_start_read include/linux/mm.h:645 [inline]
 lock_vma_under_rcu+0xd3/0x2d0 mm/memory.c:5396
 do_user_addr_fault arch/x86/mm/fault.c:1335 [inline]
 handle_page_fault arch/x86/mm/fault.c:1486 [inline]
 exc_page_fault+0x160/0x650 arch/x86/mm/fault.c:1542
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

write to 0xffff88813f4398b0 of 4 bytes by task 24748 on cpu 1:
 vma_start_write include/linux/mm.h:691 [inline]
 vma_prepare+0x11f/0x520 mm/mmap.c:479
 vma_merge+0x6e5/0xc50 mm/mmap.c:999
 mprotect_fixup+0x2e0/0x650 mm/mprotect.c:631
 do_mprotect_pkey+0x641/0x920 mm/mprotect.c:817
 __do_sys_mprotect mm/mprotect.c:838 [inline]
 __se_sys_mprotect mm/mprotect.c:835 [inline]
 __x64_sys_mprotect+0x48/0x50 mm/mprotect.c:835
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24748 Comm: syz-executor.3 Not tainted 6.5.0-rc3-syzkaller-00123-g57012c57536f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
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