[EXT4 FS bs=2048, gc=1, bpg=16384, ipg=32, mo=e000c018, mo2=0002]
System zones: 
==================================================================
BUG: KCSAN: data-race in _prb_read_valid / prb_reserve

write to 0xffffffff868ab0f0 of 88 bytes by task 11173 on cpu 1:
 prb_reserve+0x696/0xaf0 kernel/printk/printk_ringbuffer.c:1635
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326
 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2475
 __quota_error+0xf8/0x110 fs/quota/dquot.c:148
 find_tree_dqentry+0x6c8/0x8c0 fs/quota/quota_tree.c:689
 find_tree_dqentry+0x4c9/0x8c0 fs/quota/quota_tree.c:698
 find_dqentry fs/quota/quota_tree.c:716 [inline]
 qtree_read_dquot+0x35c/0x4a0 fs/quota/quota_tree.c:736
 v2_read_dquot+0x98/0xd0 fs/quota/quota_v2.c:344
 dquot_acquire+0xce/0x2b0 fs/quota/dquot.c:461
 ext4_acquire_dquot+0x15f/0x200 fs/ext4/super.c:6939
 dqget+0x532/0x8d0 fs/quota/dquot.c:977
 __dquot_initialize+0x20c/0x7c0 fs/quota/dquot.c:1505
 dquot_initialize+0x1a/0x30 fs/quota/dquot.c:1567
 ext4_process_orphan+0x32/0x1c0 fs/ext4/orphan.c:329
 ext4_orphan_cleanup+0x6a8/0xa00 fs/ext4/orphan.c:474
 __ext4_fill_super fs/ext4/super.c:5615 [inline]
 ext4_fill_super+0x3260/0x35d0 fs/ext4/super.c:5734
 get_tree_bdev_flags+0x291/0x300 fs/super.c:1692
 get_tree_bdev+0x1f/0x30 fs/super.c:1715
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5766
 vfs_get_tree+0x54/0x1d0 fs/super.c:1752
 do_new_mount+0x207/0x600 fs/namespace.c:3750
 path_mount+0x4a4/0xb30 fs/namespace.c:4065
 do_mount fs/namespace.c:4078 [inline]
 __do_sys_mount fs/namespace.c:4278 [inline]
 __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4255
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4255
 x64_sys_call+0x2b51/0x3000 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff868ab0f0 of 8 bytes by task 11171 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:486 [inline]
 prb_first_seq kernel/printk/printk_ringbuffer.c:1957 [inline]
 _prb_read_valid+0x383/0x920 kernel/printk/printk_ringbuffer.c:2114
 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2185
 printk_get_next_message+0xc8/0x510 kernel/printk/printk.c:3005
 console_emit_next_record kernel/printk/printk.c:3092 [inline]
 console_flush_all+0x290/0x730 kernel/printk/printk.c:3226
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0xa1/0x330 kernel/printk/printk.c:3325
 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2475
 debug_print_tree+0x17/0x110 fs/ext4/block_validity.c:132
 ext4_setup_system_zone+0x45b/0x610 fs/ext4/block_validity.c:265
 __ext4_fill_super fs/ext4/super.c:5541 [inline]
 ext4_fill_super+0x2efa/0x35d0 fs/ext4/super.c:5734
 get_tree_bdev_flags+0x291/0x300 fs/super.c:1692
 get_tree_bdev+0x1f/0x30 fs/super.c:1715
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5766
 vfs_get_tree+0x54/0x1d0 fs/super.c:1752
 do_new_mount+0x207/0x600 fs/namespace.c:3750
 path_mount+0x4a4/0xb30 fs/namespace.c:4065
 do_mount fs/namespace.c:4078 [inline]
 __do_sys_mount fs/namespace.c:4278 [inline]
 __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4255
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4255
 x64_sys_call+0x2b51/0x3000 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000002378 -> 0x0000000000004378

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 11171 Comm: syz.1.13779 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
==================================================================
0-2
, 18-18, 34-35
EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
ext4 filesystem being mounted at /258/file1 supports timestamps until 2038-01-19 (0x7fffffff)