EXT4-fs (loop8): unmounting filesystem 00000000-0000-0000-0000-000000000000.
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BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

read-write to 0xffff888237d2ba28 of 8 bytes by task 8563 on cpu 1:
 bh_lru_install fs/buffer.c:1337 [inline]
 __find_get_block+0x42e/0x890 fs/buffer.c:1400
 bdev_getblk+0x30/0x3b0 fs/buffer.c:1425
 getblk_unmovable include/linux/buffer_head.h:369 [inline]
 ext4_getblk+0x1bd/0x530 fs/ext4/inode.c:864
 ext4_bread+0x2c/0x110 fs/ext4/inode.c:912
 ext4_quota_read+0x105/0x1c0 fs/ext4/super.c:7228
 qtree_read_dquot+0x12e/0x4b0 fs/quota/quota_tree.c:754
 v2_read_dquot+0x96/0xd0 fs/quota/quota_v2.c:344
 dquot_acquire+0xc3/0x2b0 fs/quota/dquot.c:461
 ext4_acquire_dquot+0x170/0x210 fs/ext4/super.c:6923
 dqget+0x522/0x8b0 fs/quota/dquot.c:977
 __dquot_initialize+0x26d/0x760 fs/quota/dquot.c:1505
 dquot_initialize+0x1a/0x20 fs/quota/dquot.c:1567
 ext4_create+0x4b/0x2f0 fs/ext4/namei.c:2834
 lookup_open fs/namei.c:3651 [inline]
 open_last_lookups fs/namei.c:3750 [inline]
 path_openat+0xea3/0x1fc0 fs/namei.c:3986
 do_filp_open+0x107/0x230 fs/namei.c:4016
 do_sys_openat2+0xab/0x120 fs/open.c:1428
 do_sys_open fs/open.c:1443 [inline]
 __do_sys_open fs/open.c:1451 [inline]
 __se_sys_open fs/open.c:1447 [inline]
 __x64_sys_open+0xe6/0x110 fs/open.c:1447
 x64_sys_call+0x13e1/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:3
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d2ba28 of 8 bytes by task 4428 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1521
 smp_call_function_many_cond+0x305/0xbb0 kernel/smp.c:838
 on_each_cpu_cond_mask+0x3c/0x90 kernel/smp.c:1052
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1530
 kill_bdev block/bdev.c:90 [inline]
 blkdev_flush_mapping+0x9b/0x1a0 block/bdev.c:670
 blkdev_put_whole block/bdev.c:677 [inline]
 bdev_release+0x2f9/0x420 block/bdev.c:1102
 blkdev_release+0x15/0x20 block/fops.c:660
 __fput+0x2ac/0x640 fs/file_table.c:464
 ____fput+0x1c/0x30 fs/file_table.c:492
 task_work_run+0x13a/0x1a0 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xa8/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff88812713f138

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4428 Comm: syz-executor Tainted: G        W          6.14.0-rc7-syzkaller #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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