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BUG: KCSAN: data-race in find_get_block_common / has_bh_in_lru

read-write to 0xffff888237c26f50 of 8 bytes by task 4450 on cpu 0:
 bh_lru_install fs/buffer.c:1345 [inline]
 find_get_block_common+0x4f0/0x960 fs/buffer.c:1410
 __find_get_block_nonatomic fs/buffer.c:1429 [inline]
 bdev_getblk+0x83/0x3b0 fs/buffer.c:1453
 getblk_unmovable include/linux/buffer_head.h:369 [inline]
 ext4_getblk+0x1b6/0x510 fs/ext4/inode.c:993
 ext4_bread+0x28/0x110 fs/ext4/inode.c:1041
 ext4_quota_read+0xe8/0x260 fs/ext4/super.c:7255
 read_blk fs/quota/quota_tree.c:61 [inline]
 find_tree_dqentry+0x119/0x8c0 fs/quota/quota_tree.c:671
 find_tree_dqentry+0x4c9/0x8c0 fs/quota/quota_tree.c:698
 find_tree_dqentry+0x4c9/0x8c0 fs/quota/quota_tree.c:698
 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:6933
 dqget+0x532/0x8d0 fs/quota/dquot.c:977
 __dquot_initialize+0x27f/0x7c0 fs/quota/dquot.c:1505
 dquot_initialize+0x1a/0x30 fs/quota/dquot.c:1567
 ext4_unlink+0x9c/0x2b0 fs/ext4/namei.c:3307
 vfs_unlink+0x269/0x420 fs/namei.c:4586
 do_unlinkat+0x24e/0x480 fs/namei.c:4650
 __do_sys_unlinkat fs/namei.c:4691 [inline]
 __se_sys_unlinkat fs/namei.c:4684 [inline]
 __x64_sys_unlinkat+0x97/0xb0 fs/namei.c:4684
 x64_sys_call+0x2ede/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:264
 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 0xffff888237c26f50 of 8 bytes by task 3909 on cpu 1:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1551
 smp_call_function_many_cond+0x2a9/0xc60 kernel/smp.c:821
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1044
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1560
 kill_bdev block/bdev.c:90 [inline]
 blkdev_flush_mapping+0x9a/0x1a0 block/bdev.c:712
 blkdev_put_whole block/bdev.c:719 [inline]
 bdev_release+0x2bf/0x3d0 block/bdev.c:1144
 blkdev_release+0x15/0x20 block/fops.c:699
 __fput+0x298/0x650 fs/file_table.c:468
 fput_close_sync+0x6e/0x120 fs/file_table.c:573
 __do_sys_close fs/open.c:1587 [inline]
 __se_sys_close fs/open.c:1572 [inline]
 __x64_sys_close+0x56/0xf0 fs/open.c:1572
 x64_sys_call+0x2738/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:4
 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: 0xffff888119d7e888 -> 0xffff888119d7e8f0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3909 Comm: udevd Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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