loop7: detected capacity change from 0 to 2048
EXT4-fs: Ignoring removed bh option
==================================================================
BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

read-write to 0xffff888237d26b30 of 8 bytes by task 8734 on cpu 1:
 bh_lru_install fs/buffer.c:1337 [inline]
 __find_get_block+0x430/0x8a0 fs/buffer.c:1400
 __getblk_slow fs/buffer.c:1127 [inline]
 bdev_getblk+0x139/0x3b0 fs/buffer.c:1431
 getblk_unmovable include/linux/buffer_head.h:368 [inline]
 ext4_getblk+0x1bf/0x550 fs/ext4/inode.c:867
 ext4_bread+0x2c/0x110 fs/ext4/inode.c:915
 ext4_quota_read+0x108/0x1d0 fs/ext4/super.c:7253
 read_blk fs/quota/quota_tree.c:61 [inline]
 find_tree_dqentry+0x120/0x950 fs/quota/quota_tree.c:671
 find_tree_dqentry+0x4f5/0x950 fs/quota/quota_tree.c:698
 find_dqentry fs/quota/quota_tree.c:716 [inline]
 qtree_read_dquot+0x371/0x4c0 fs/quota/quota_tree.c:736
 v2_read_dquot+0x99/0xd0 fs/quota/quota_v2.c:344
 dquot_acquire+0xc6/0x2c0 fs/quota/dquot.c:461
 ext4_acquire_dquot+0x173/0x220 fs/ext4/super.c:6931
 dqget+0x522/0x8b0 fs/quota/dquot.c:977
 __dquot_initialize+0x18e/0x790 fs/quota/dquot.c:1505
 dquot_initialize+0x1a/0x20 fs/quota/dquot.c:1567
 ext4_mkdir+0xd3/0x740 fs/ext4/namei.c:3000
 vfs_mkdir+0x214/0x350 fs/namei.c:4324
 do_mkdirat+0x13c/0x2e0 fs/namei.c:4357
 __do_sys_mkdir fs/namei.c:4379 [inline]
 __se_sys_mkdir fs/namei.c:4377 [inline]
 __x64_sys_mkdir+0x42/0x50 fs/namei.c:4377
 x64_sys_call+0x20d0/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:84
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d26b30 of 8 bytes by task 8736 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1521
 smp_call_function_many_cond+0x30a/0xbc0 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]
 set_blocksize+0x24f/0x270 block/bdev.c:175
 sb_set_blocksize+0x7e/0x100 block/bdev.c:186
 ext4_load_super fs/ext4/super.c:5112 [inline]
 __ext4_fill_super fs/ext4/super.c:5264 [inline]
 ext4_fill_super+0x1345/0x3580 fs/ext4/super.c:5726
 get_tree_bdev_flags+0x2b4/0x330 fs/super.c:1636
 get_tree_bdev+0x1f/0x30 fs/super.c:1659
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5758
 vfs_get_tree+0x56/0x1e0 fs/super.c:1759
 do_new_mount+0x246/0x6b0 fs/namespace.c:3879
 path_mount+0x49b/0xb30 fs/namespace.c:4206
 do_mount fs/namespace.c:4219 [inline]
 __do_sys_mount fs/namespace.c:4430 [inline]
 __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4407
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4407
 x64_sys_call+0xd11/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff88811a2a9f08 -> 0xffff88811a2a98f0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 8736 Comm: syz.7.1616 Not tainted 6.14.0-syzkaller-13189-ge48e99b6edf4 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================
EXT4-fs (loop7): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.