EXT4-fs (loop3): unmounting filesystem 00000000-0000-0000-0000-000000000000.
==================================================================
BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

read-write to 0xffff888237c2ba28 of 8 bytes by task 3939 on cpu 0:
 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
 read_blk fs/quota/quota_tree.c:61 [inline]
 find_tree_dqentry+0x124/0x910 fs/quota/quota_tree.c:671
 find_dqentry fs/quota/quota_tree.c:716 [inline]
 qtree_read_dquot+0x353/0x4b0 fs/quota/quota_tree.c:736
 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+0x194/0x760 fs/quota/dquot.c:1505
 dquot_initialize+0x1a/0x20 fs/quota/dquot.c:1567
 ext4_unlink+0x72/0x2a0 fs/ext4/namei.c:3320
 vfs_unlink+0x275/0x430 fs/namei.c:4525
 do_unlinkat+0x237/0x4d0 fs/namei.c:4589
 __do_sys_unlink fs/namei.c:4637 [inline]
 __se_sys_unlink fs/namei.c:4635 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4635
 x64_sys_call+0x2329/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:88
 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 0xffff888237c2ba28 of 8 bytes by task 3309 on cpu 1:
 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
 invalidate_bdev+0x42/0x70 block/bdev.c:100
 ext4_put_super+0x571/0x810 fs/ext4/super.c:1356
 generic_shutdown_super+0xe5/0x220 fs/super.c:642
 kill_block_super+0x2a/0x70 fs/super.c:1710
 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7368
 deactivate_locked_super+0x7d/0x1c0 fs/super.c:473
 deactivate_super+0x9f/0xb0 fs/super.c:506
 cleanup_mnt+0x268/0x2e0 fs/namespace.c:1413
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1420
 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: 0xffff888106784000 -> 0xffff8881066e2dd0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3309 Comm: syz-executor Not tainted 6.14.0-rc7-syzkaller-00186-gd07de43e3f05 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================
EXT4-fs (loop3): unmounting filesystem 00000000-0000-0000-0000-000000000000.