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BUG: KCSAN: data-race in prepare_kernel_cred / prepare_kernel_cred

write to 0xffffffff86860490 of 4 bytes by task 7395 on cpu 0:
 get_cred_rcu include/linux/cred.h:228 [inline]
 get_task_cred kernel/cred.c:162 [inline]
 prepare_kernel_cred+0xf5/0x680 kernel/cred.c:593
 _request_firmware+0x446/0xbb0 drivers/base/firmware_loader/main.c:874
 request_firmware drivers/base/firmware_loader/main.c:957 [inline]
 cache_firmware drivers/base/firmware_loader/main.c:1295 [inline]
 __async_dev_cache_fw_image+0x66/0x160 drivers/base/firmware_loader/main.c:1409
 async_run_entry_fn+0x52/0x180 kernel/async.c:129
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff868603e8 of 184 bytes by task 7457 on cpu 1:
 prepare_kernel_cred+0x114/0x680 kernel/cred.c:595
 _request_firmware+0x446/0xbb0 drivers/base/firmware_loader/main.c:874
 request_firmware drivers/base/firmware_loader/main.c:957 [inline]
 cache_firmware drivers/base/firmware_loader/main.c:1295 [inline]
 __async_dev_cache_fw_image+0x66/0x160 drivers/base/firmware_loader/main.c:1409
 async_run_entry_fn+0x52/0x180 kernel/async.c:129
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3319
 worker_thread+0x582/0x770 kernel/workqueue.c:3400
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7457 Comm: kworker/u8:66 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: async async_run_entry_fn
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