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EXT4-fs error (device loop7): ext4_map_blocks:671: inode #3: block 1: comm kworker/u8:7: lblock 1 mapped to illegal pblock 1 (length 1)
==================================================================
BUG: KCSAN: data-race in data_push_tail / string

write to 0xffffffff88bd8993 of 1 bytes by task 10062 on cpu 1:
 string_nocheck lib/vsprintf.c:643 [inline]
 string+0x17f/0x210 lib/vsprintf.c:721
 vsnprintf+0x537/0x890 lib/vsprintf.c:2850
 va_format lib/vsprintf.c:1711 [inline]
 pointer+0x84a/0xcf0 lib/vsprintf.c:2472
 vsnprintf+0x48d/0x890 lib/vsprintf.c:2854
 vscnprintf+0x42/0x90 lib/vsprintf.c:2915
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2216
 vprintk_store+0x589/0x870 kernel/printk/printk.c:2336
 vprintk_emit+0x168/0x690 kernel/printk/printk.c:2408
 dev_vprintk_emit+0x23c/0x2a0 drivers/base/core.c:4891
 dev_printk_emit+0x82/0xb0 drivers/base/core.c:4902
 __dev_printk+0xf6/0x110 drivers/base/core.c:4914
 _dev_info+0x99/0xc0 drivers/base/core.c:4960
 hid_connect+0xdff/0xe30 drivers/hid/hid-core.c:2309
 hid_hw_start+0x7c/0xd0 drivers/hid/hid-core.c:2350
 hid_generic_probe+0x5b/0x70 drivers/hid/hid-generic.c:70
 __hid_device_probe drivers/hid/hid-core.c:2713 [inline]
 hid_device_probe+0x259/0x440 drivers/hid/hid-core.c:2750
 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:462
 __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:537
 device_add+0x5e2/0x790 drivers/base/core.c:3666
 hid_add_device+0x26e/0x2f0 drivers/hid/hid-core.c:2896
 uhid_device_add_worker+0x2b/0xa0 drivers/hid/uhid.c:73
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4db/0xa20 kernel/workqueue.c:3319
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3400
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffffffff88bd8990 of 8 bytes by task 2021 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:679
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1054
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x168/0x690 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 __ext4_error_inode+0x30b/0x400 fs/ext4/super.c:856
 ext4_map_blocks+0xa85/0xd20
 ext4_getblk+0x11f/0x530 fs/ext4/inode.c:849
 ext4_bread+0x2c/0x110 fs/ext4/inode.c:912
 ext4_quota_read+0x105/0x1c0 fs/ext4/super.c:7228
 read_blk fs/quota/quota_tree.c:61 [inline]
 remove_tree+0x12a/0x1120 fs/quota/quota_tree.c:555
 qtree_delete_dquot fs/quota/quota_tree.c:617 [inline]
 qtree_release_dquot+0x16f/0x180 fs/quota/quota_tree.c:787
 v2_release_dquot+0x96/0xd0 fs/quota/quota_v2.c:391
 dquot_release+0x11a/0x230 fs/quota/dquot.c:537
 ext4_release_dquot+0x12d/0x1e0
 quota_release_workfn+0x252/0x540 fs/quota/dquot.c:840
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4db/0xa20 kernel/workqueue.c:3319
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3400
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x00000001000010d7 -> 0x0a317a7973206e6f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2021 Comm: kworker/u8:7 Not tainted 6.14.0-syzkaller-00685-g3ba7dfb8da62 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound quota_release_workfn
==================================================================
EXT4-fs error (device loop7): ext4_release_dquot:6950: comm kworker/u8:7: Failed to release dquot type 0