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BUG: KCSAN: data-race in desc_read_finalized_seq / prb_reserve

write to 0xffffffff86933c70 of 8 bytes by task 3379 on cpu 1:
 prb_reserve+0x750/0xb80 kernel/printk/printk_ringbuffer.c:-1
 vprintk_store+0x552/0x860 kernel/printk/printk.c:2326
 vprintk_emit+0x1a0/0x6c0 kernel/printk/printk.c:2426
 dev_vprintk_emit+0x24a/0x2a0 drivers/base/core.c:4891
 dev_printk_emit+0x84/0xb0 drivers/base/core.c:4902
 __dev_printk+0xf6/0x110 drivers/base/core.c:4914
 _dev_warn+0x9e/0xd0 drivers/base/core.c:4958
 hid_parser_main+0x6f4/0x750 drivers/hid/hid-core.c:-1
 hid_open_report+0x543/0x7c0 drivers/hid/hid-core.c:1328
 hid_parse include/linux/hid.h:1126 [inline]
 hid_generic_probe+0x33/0x70 drivers/hid/hid-generic.c:66
 __hid_device_probe drivers/hid/hid-core.c:2717 [inline]
 hid_device_probe+0x259/0x440 drivers/hid/hid-core.c:2754
 call_driver_probe drivers/base/dd.c:-1 [inline]
 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+0x1cf/0x250 drivers/base/bus.c:462
 __device_attach+0x1d6/0x2b0 drivers/base/dd.c:1030
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1079
 bus_probe_device+0x141/0x1d0 drivers/base/bus.c:537
 device_add+0x5e2/0x790 drivers/base/core.c:3666
 hid_add_device+0x26e/0x2f0 drivers/hid/hid-core.c:2900
 uhid_device_add_worker+0x2b/0xa0 drivers/hid/uhid.c:73
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4de/0xa20 kernel/workqueue.c:3319
 worker_thread+0x52c/0x710 kernel/workqueue.c:3400
 kthread+0x4b7/0x540 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff86933c70 of 8 bytes by task 2994 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:486 [inline]
 desc_read_finalized_seq+0x163/0x280 kernel/printk/printk_ringbuffer.c:1874
 prb_read kernel/printk/printk_ringbuffer.c:1922 [inline]
 _prb_read_valid+0x142/0x710 kernel/printk/printk_ringbuffer.c:2113
 prb_read_valid+0x42/0x70 kernel/printk/printk_ringbuffer.c:2185
 syslog_print+0x242/0x540 kernel/printk/printk.c:1650
 do_syslog+0x3ae/0x810 kernel/printk/printk.c:1785
 __do_sys_syslog kernel/printk/printk.c:1877 [inline]
 __se_sys_syslog kernel/printk/printk.c:1875 [inline]
 __x64_sys_syslog+0x43/0x50 kernel/printk/printk.c:1875
 x64_sys_call+0x2b8f/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:104
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000003c06 -> 0x0000000000005c06

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2994 Comm: klogd Not tainted 6.14.0-syzkaller-13423-ga8662bcd2ff1 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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