hid-generic 0000:0003:0000.0006: unknown main item tag 0x0
hid-generic 0000:0003:0000.0006: unknown main item tag 0x0
hid-generic 0000:0003:0000.0006: unknown main item tag 0x0
hid-generic 0000:0003:0000.0006: unknown main item tag 0x0
hid-generic 0000:0003:0000.0006: unknown main item tag 0x0
==================================================================
BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff86668b50 of 8 bytes by task 12379 on cpu 0:
 data_alloc+0x291/0x2c0 kernel/printk/printk_ringbuffer.c:1096
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 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
 set_capacity_and_notify+0xff/0x160 block/genhd.c:86
 loop_set_size+0x2e/0x70 drivers/block/loop.c:232
 loop_configure+0x8a6/0xa30 drivers/block/loop.c:1101
 lo_ioctl+0x5f6/0x11c0
 blkdev_ioctl+0x359/0x450 block/ioctl.c:693
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xc9/0x140 fs/ioctl.c:892
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:892
 x64_sys_call+0x1690/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86668b50 of 8 bytes by task 3372 on cpu 1:
 desc_read kernel/printk/printk_ringbuffer.c:482 [inline]
 desc_push_tail kernel/printk/printk_ringbuffer.c:778 [inline]
 desc_reserve kernel/printk/printk_ringbuffer.c:924 [inline]
 prb_reserve+0x235/0xb60 kernel/printk/printk_ringbuffer.c:1619
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 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_warn+0x99/0xc0 drivers/base/core.c:5002
 hid_parser_main+0x622/0x680 drivers/hid/hid-core.c:660
 hid_open_report+0x541/0x7c0 drivers/hid/hid-core.c:1322
 hid_parse include/linux/hid.h:1123 [inline]
 hid_generic_probe+0x33/0x70 drivers/hid/hid-generic.c:66
 __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:3236 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3317
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3398
 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: 0x00000000001278a0 -> 0x00000000001dad78

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3372 Comm: kworker/1:3 Not tainted 6.13.0-rc7-syzkaller-00039-gc3812b15000c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events uhid_device_add_worker
==================================================================
hid-generic 0000:0003:0000.0006: unknown main item tag 0x0
hid-generic 0000:0003:0000.0006: unknown main item tag 0x0
hid-generic 0000:0003:0000.0006: hidraw0: <UNKNOWN> HID v0.00 Device [syz0] on syz0