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EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.
==================================================================
BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

read-write to 0xffff888237d2a578 of 8 bytes by task 5264 on cpu 1:
 bh_lru_install fs/buffer.c:1299 [inline]
 __find_get_block+0x3db/0x930 fs/buffer.c:1358
 __getblk_gfp+0x31/0x8d0 fs/buffer.c:1378
 sb_getblk include/linux/buffer_head.h:365 [inline]
 ext4_getblk+0x191/0x4e0 fs/ext4/inode.c:845
 ext4_bread_batch+0x5b/0x350 fs/ext4/inode.c:912
 __ext4_find_entry+0x9cf/0x10a0 fs/ext4/namei.c:1666
 ext4_find_entry fs/ext4/namei.c:1746 [inline]
 ext4_rmdir+0x141/0x630 fs/ext4/namei.c:3158
 vfs_rmdir+0x24e/0x2f0 fs/namei.c:4198
 do_rmdir+0x194/0x310 fs/namei.c:4257
 __do_sys_unlinkat fs/namei.c:4435 [inline]
 __se_sys_unlinkat fs/namei.c:4429 [inline]
 __x64_sys_unlinkat+0xa4/0xb0 fs/namei.c:4429
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888237d2a578 of 8 bytes by task 3057 on cpu 0:
 has_bh_in_lru+0x35/0x1e0 fs/buffer.c:1452
 smp_call_function_many_cond+0x2f0/0xa60 kernel/smp.c:775
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:996
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1461
 kill_bdev block/bdev.c:75 [inline]
 blkdev_flush_mapping+0xb0/0x1b0 block/bdev.c:596
 blkdev_put_whole block/bdev.c:627 [inline]
 blkdev_put+0x334/0x430 block/bdev.c:887
 kill_block_super+0x83/0xa0 fs/super.c:1410
 deactivate_locked_super+0x6b/0xd0 fs/super.c:331
 deactivate_super+0x9b/0xb0 fs/super.c:362
 cleanup_mnt+0x272/0x2e0 fs/namespace.c:1177
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1184
 task_work_run+0x135/0x1a0 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd1/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff88810a1ba068 -> 0xffff88810a26a478

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3057 Comm: syz-executor.5 Not tainted 6.4.0-rc5-syzkaller-00024-g5f63595ebd82 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
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EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.