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BUG: KCSAN: data-race in vga_arb_write / vga_arb_write

read to 0xffff888117283a24 of 4 bytes by task 6857 on cpu 0:
 vga_arb_write+0xed4/0x1410 drivers/pci/vgaarb.c:1250
 vfs_write+0x28b/0x8e0 fs/read_write.c:588
 ksys_write+0xeb/0x1b0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:652
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

read-write to 0xffff888117283a24 of 4 bytes by task 6856 on cpu 1:
 vga_arb_write+0x1200/0x1410 drivers/pci/vgaarb.c:1204
 vfs_write+0x28b/0x8e0 fs/read_write.c:588
 ksys_write+0xeb/0x1b0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:652
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

value changed: 0x00000027 -> 0x0000001c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 6856 Comm: syz-executor.2 Tainted: G        W          6.9.0-rc3-syzkaller-00011-g20cb38a7af88 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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