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

read-write to 0xffff888237c2b990 of 8 bytes by task 12727 on cpu 0:
 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_getblk+0x1c1/0x510 fs/ext4/inode.c:843
 ext4_bread+0x2c/0x110 fs/ext4/inode.c:889
 __ext4_read_dirblock+0x77/0x5b0 fs/ext4/namei.c:144
 htree_dirblock_to_tree+0x102/0x630 fs/ext4/namei.c:1082
 ext4_htree_fill_tree+0x429/0x9c0 fs/ext4/namei.c:1219
 ext4_dx_readdir fs/ext4/dir.c:597 [inline]
 ext4_readdir+0x15bf/0x1ad0 fs/ext4/dir.c:142
 iterate_dir+0x12c/0x310 fs/readdir.c:110
 __do_sys_getdents64 fs/readdir.c:409 [inline]
 __se_sys_getdents64+0x88/0x1a0 fs/readdir.c:394
 __x64_sys_getdents64+0x43/0x50 fs/readdir.c:394
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

read to 0xffff888237c2b990 of 8 bytes by task 12163 on cpu 1:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1510
 cpu_needs_drain mm/swap.c:817 [inline]
 __lru_add_drain_all+0x254/0x420 mm/swap.c:904
 lru_add_drain_all+0x10/0x20 mm/swap.c:920
 invalidate_bdev+0x54/0x80 block/bdev.c:95
 ext4_put_super+0x51b/0x7e0 fs/ext4/super.c:1361
 generic_shutdown_super+0xde/0x210 fs/super.c:641
 kill_block_super+0x2a/0x70 fs/super.c:1675
 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7327
 deactivate_locked_super+0x7d/0x1c0 fs/super.c:472
 deactivate_super+0x9f/0xb0 fs/super.c:505
 cleanup_mnt+0x272/0x2e0 fs/namespace.c:1267
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1274
 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+0xe2/0x1d0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

value changed: 0x0000000000000000 -> 0xffff888108764680

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12163 Comm: syz-executor.3 Tainted: G        W          6.9.0-rc3-syzkaller-00011-g20cb38a7af88 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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