KCSAN: data-race in vga_arb_write / vga_arb

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in vga_arb_write / vga_arb_write (4) pci	6	1	590d	574d	0/29	auto-obsoleted due to no activity on 2025/02/20 05:21
upstream	KCSAN: data-race in vga_arb_write / vga_arb_write (3) pci	6	1	851d	851d	0/29	auto-obsoleted due to no activity on 2024/05/14 06:54
upstream	KCSAN: data-race in vga_arb_write / vga_arb_write (2) pci	6	1	932d	932d	0/29	auto-obsoleted due to no activity on 2024/02/22 14:54

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BUG: KCSAN: data-race in vga_arb_write / vga_arb_write

write to 0xffff888157ebd220 of 4 bytes by task 25699 on cpu 0:
 vga_arb_write+0x1602/0x1830 drivers/gpu/vga/vgaarb.c:1100
 vfs_write+0x2af/0x950 fs/read_write.c:588
 ksys_write+0xd9/0x190 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+0x3e/0x50 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888157ebd220 of 4 bytes by task 25698 on cpu 1:
 vga_arb_write+0x15f3/0x1830 drivers/gpu/vga/vgaarb.c:1100
 vfs_write+0x2af/0x950 fs/read_write.c:588
 ksys_write+0xd9/0x190 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+0x3e/0x50 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000005 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 25698 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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