ext4 filesystem being mounted at /79/file0 supports timestamps until 2038-01-19 (0x7fffffff)
EXT4-fs (loop0): unmounting filesystem 00000000-0000-0000-0000-000000000000.
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BUG: KCSAN: data-race in _prb_read_valid / data_alloc

write to 0xffffffff868915c8 of 8 bytes by task 30288 on cpu 1:
 data_alloc+0x310/0x390 kernel/printk/printk_ringbuffer.c:1129
 prb_reserve+0x8d7/0xad0 kernel/printk/printk_ringbuffer.c:1724
 vprintk_store+0x53c/0x830 kernel/printk/printk.c:2302
 vprintk_emit+0x15a/0x5c0 kernel/printk/printk.c:2402
 dev_vprintk_emit+0x242/0x2a0 drivers/base/core.c:4914
 dev_printk_emit+0x84/0xb0 drivers/base/core.c:4925
 __dev_printk+0xf3/0x110 drivers/base/core.c:4937
 _dev_warn+0x9b/0xd0 drivers/base/core.c:4981
 hid_parser_main+0x7a5/0x800 drivers/hid/hid-core.c:-1
 hid_open_report+0x48e/0x7a0 drivers/hid/hid-core.c:1341
 hid_parse include/linux/hid.h:1165 [inline]
 hid_generic_probe+0x33/0x70 drivers/hid/hid-generic.c:66
 __hid_device_probe drivers/hid/hid-core.c:2775 [inline]
 hid_device_probe+0x312/0x4e0 drivers/hid/hid-core.c:2812
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x1bf/0x5c0 drivers/base/dd.c:659
 __driver_probe_device+0x121/0x190 drivers/base/dd.c:801
 driver_probe_device+0x37/0x2f0 drivers/base/dd.c:831
 __device_attach_driver+0x205/0x310 drivers/base/dd.c:959
 bus_for_each_drv+0x1c0/0x230 drivers/base/bus.c:500
 __device_attach+0x1c7/0x290 drivers/base/dd.c:1031
 device_initial_probe+0x70/0x90 drivers/base/dd.c:1086
 bus_probe_device+0x101/0x1b0 drivers/base/bus.c:574
 device_add+0x5c9/0x770 drivers/base/core.c:3689
 hid_add_device+0x1b0/0x230 drivers/hid/hid-core.c:2951
 uhid_device_add_worker+0x2b/0xa0 drivers/hid/uhid.c:73
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x582/0x770 kernel/workqueue.c:3421
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

read to 0xffffffff868915c8 of 16 bytes by task 31383 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:496 [inline]
 desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1931 [inline]
 prb_read kernel/printk/printk_ringbuffer.c:1979 [inline]
 _prb_read_valid+0x1bc/0x920 kernel/printk/printk_ringbuffer.c:2170
 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2242
 printk_get_next_message+0xc8/0x510 kernel/printk/printk.c:2999
 console_emit_next_record kernel/printk/printk.c:3083 [inline]
 console_flush_one_record kernel/printk/printk.c:3215 [inline]
 console_flush_all+0x2c8/0x6c0 kernel/printk/printk.c:3289
 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline]
 console_unlock+0x97/0x270 kernel/printk/printk.c:3359
 class_console_lock_destructor include/linux/console.h:737 [inline]
 do_con_write+0x28df/0x2940 drivers/tty/vt/vt.c:3243
 con_write+0x24/0x40 drivers/tty/vt/vt.c:3565
 process_output_block drivers/tty/n_tty.c:557 [inline]
 n_tty_write+0x82d/0xbf0 drivers/tty/n_tty.c:2366
 iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
 file_tty_write+0x378/0x690 drivers/tty/tty_io.c:1081
 tty_write+0x25/0x30 drivers/tty/tty_io.c:1102
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x52a/0x960 fs/read_write.c:686
 ksys_write+0xda/0x1a0 fs/read_write.c:738
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:746
 x64_sys_call+0x2847/0x3000 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 31383 Comm: syz.0.8986 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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