syzbot

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BUG: KCSAN: data-race in vga_arb_write / vga_arb_write

read to 0xffff88813acfac20 of 4 bytes by task 4261 on cpu 1:
 vga_arb_write+0xf06/0x1410 drivers/pci/vgaarb.c:1255
 vfs_write+0x27a/0x790 fs/read_write.c:588
 ksys_write+0xeb/0x1a0 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_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read-write to 0xffff88813acfac20 of 4 bytes by task 4257 on cpu 0:
 vga_arb_write+0x1216/0x1410 drivers/pci/vgaarb.c:1206
 vfs_write+0x27a/0x790 fs/read_write.c:588
 ksys_write+0xeb/0x1a0 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_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000001a -> 0x00000003

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4257 Comm: syz-executor.5 Not tainted 6.7.0-syzkaller-11091-g296455ade1fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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