EXT4-fs error (device loop4): ext4_mb_release_inode_pa:5444: group 0, free 0, pa_free 4
==================================================================
BUG: KCSAN: data-race in _prb_read_valid / prb_reserve

write to 0xffffffff86917790 of 88 bytes by task 24370 on cpu 1:
 prb_reserve+0x695/0xaf0 kernel/printk/printk_ringbuffer.c:1651
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2299
 vprintk_emit+0x10d/0x580 kernel/printk/printk.c:2399
 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:1164 [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:462
 __device_attach+0x1c7/0x290 drivers/base/dd.c:1031
 device_initial_probe+0x1a/0x30 drivers/base/dd.c:1080
 bus_probe_device+0x143/0x1d0 drivers/base/bus.c:537
 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:3263 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3346
 worker_thread+0x582/0x770 kernel/workqueue.c:3427
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x122/0x1b0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff86917790 of 8 bytes by task 16684 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:483 [inline]
 desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1892 [inline]
 prb_read kernel/printk/printk_ringbuffer.c:1940 [inline]
 _prb_read_valid+0x1c4/0x920 kernel/printk/printk_ringbuffer.c:2131
 desc_update_last_finalized kernel/printk/printk_ringbuffer.c:1531 [inline]
 prb_final_commit+0x136/0x1e0 kernel/printk/printk_ringbuffer.c:1800
 vprintk_store+0x7c4/0x860 kernel/printk/printk.c:2283
 vprintk_emit+0x10d/0x580 kernel/printk/printk.c:2399
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2438
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2448
 __ext4_grp_locked_error+0x5d0/0x7b0 fs/ext4/super.c:1063
 ext4_mb_release_inode_pa+0x594/0x5e0 fs/ext4/mballoc.c:5443
 ext4_discard_preallocations+0x616/0x980 fs/ext4/mballoc.c:5689
 ext4_release_file+0xf7/0x1c0 fs/ext4/file.c:177
 __fput+0x29b/0x650 fs/file_table.c:468
 ____fput+0x1c/0x30 fs/file_table.c:496
 task_work_run+0x131/0x1a0 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xed/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000007724 -> 0x0000000000009724

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 16684 Comm: syz.4.15078 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
==================================================================