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BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

read-write to 0xffff888237d2b990 of 8 bytes by task 6005 on cpu 1:
 bh_lru_install fs/buffer.c:1340 [inline]
 __find_get_block+0x438/0x8c0 fs/buffer.c:1403
 bdev_getblk+0x34/0x420 fs/buffer.c:1423
 __getblk include/linux/buffer_head.h:355 [inline]
 sb_getblk include/linux/buffer_head.h:361 [inline]
 __ext4_get_inode_loc+0x30f/0x8f0 fs/ext4/inode.c:4369
 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4482 [inline]
 __ext4_iget+0x311/0x1e80 fs/ext4/inode.c:4704
 ext4_lookup+0x15b/0x390 fs/ext4/namei.c:1854
 __lookup_slow+0x184/0x250 fs/namei.c:1692
 lookup_slow+0x3c/0x60 fs/namei.c:1709
 walk_component+0x1f5/0x230 fs/namei.c:2004
 lookup_last fs/namei.c:2461 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2485
 filename_lookup+0x127/0x300 fs/namei.c:2514
 vfs_statx+0xa2/0x320 fs/stat.c:244
 vfs_fstatat+0xcd/0x100 fs/stat.c:304
 __do_sys_newfstatat fs/stat.c:468 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:462
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:462
 x64_sys_call+0x25ff/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d2b990 of 8 bytes by task 3939 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1510
 smp_call_function_many_cond+0x2f6/0xc50 kernel/smp.c:808
 on_each_cpu_cond_mask+0x3c/0x90 kernel/smp.c:1023
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1519
 kill_bdev block/bdev.c:84 [inline]
 blkdev_flush_mapping+0xb8/0x1c0 block/bdev.c:644
 blkdev_put_whole block/bdev.c:651 [inline]
 bdev_release+0x2f4/0x410 block/bdev.c:1075
 blkdev_release+0x15/0x20 block/fops.c:628
 __fput+0x2c1/0x660 fs/file_table.c:422
 ____fput+0x15/0x20 fs/file_table.c:450
 task_work_run+0x13a/0x1a0 kernel/task_work.c:180
 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:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xbe/0x130 kernel/entry/common.c:218
 do_syscall_64+0xda/0x1d0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff8881057e36e8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3939 Comm: syz-executor.3 Not tainted 6.9.0-rc5-syzkaller-00296-g5eb4573ea63d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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EXT4-fs (loop3): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop3): unmounting filesystem 00000000-0000-0000-0000-000000000000.