hid-generic 0000:0003:0000.00D6: hidraw0: <UNKNOWN> HID v0.00 Device [syz0] on syz0
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BUG: KCSAN: data-race in _prb_read_valid / prb_reserve

write to 0xffffffff866b50f0 of 8 bytes by task 24119 on cpu 0:
 prb_reserve+0x740/0xb60
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:86
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 __ext4_msg+0x18e/0x1a0 fs/ext4/super.c:998
 ext4_put_super+0x91/0x840 fs/ext4/super.c:1303
 generic_shutdown_super+0xe5/0x220 fs/super.c:642
 kill_block_super+0x2a/0x70 fs/super.c:1710
 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7379
 deactivate_locked_super+0x7d/0x1c0 fs/super.c:473
 deactivate_super+0x9f/0xb0 fs/super.c:506
 cleanup_mnt+0x268/0x2e0 fs/namespace.c:1373
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1380
 task_work_run+0x13a/0x1a0 kernel/task_work.c:239
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xa8/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff866b50f0 of 8 bytes by task 3372 on cpu 1:
 desc_read kernel/printk/printk_ringbuffer.c:486 [inline]
 prb_first_seq kernel/printk/printk_ringbuffer.c:1957 [inline]
 _prb_read_valid+0x3bb/0xba0 kernel/printk/printk_ringbuffer.c:2114
 desc_update_last_finalized kernel/printk/printk_ringbuffer.c:1515 [inline]
 prb_final_commit+0x144/0x1f0 kernel/printk/printk_ringbuffer.c:1782
 vprintk_store+0x75d/0x870 kernel/printk/printk.c:2352
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 dev_vprintk_emit+0x1df/0x210 drivers/base/core.c:4935
 dev_printk_emit+0x82/0xb0 drivers/base/core.c:4946
 __dev_printk+0xf6/0x110 drivers/base/core.c:4958
 _dev_info+0x99/0xc0 drivers/base/core.c:5004
 hid_connect+0xdff/0xe30 drivers/hid/hid-core.c:2314
 hid_hw_start+0x7c/0xd0 drivers/hid/hid-core.c:2355
 hid_generic_probe+0x5b/0x70 drivers/hid/hid-generic.c:70
 __hid_device_probe drivers/hid/hid-core.c:2718 [inline]
 hid_device_probe+0x259/0x440 drivers/hid/hid-core.c:2755
 really_probe+0x1cf/0x5d0 drivers/base/dd.c:658
 __driver_probe_device+0x12d/0x200 drivers/base/dd.c:800
 driver_probe_device+0x38/0x2f0 drivers/base/dd.c:830
 __device_attach_driver+0x216/0x320 drivers/base/dd.c:958
 bus_for_each_drv+0x1cd/0x240 drivers/base/bus.c:459
 __device_attach+0x1c7/0x290 drivers/base/dd.c:1030
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1079
 bus_probe_device+0x141/0x1d0 drivers/base/bus.c:534
 device_add+0x5e2/0x790 drivers/base/core.c:3665
 hid_add_device+0x26e/0x2f0 drivers/hid/hid-core.c:2901
 uhid_device_add_worker+0x2b/0xa0 drivers/hid/uhid.c:73
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x0000000000008602 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3372 Comm: kworker/1:3 Not tainted 6.13.0-rc4-syzkaller-00078-g059dd502b263 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events uhid_device_add_worker
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