EXT4-fs (loop3): unmounting filesystem 00000000-0000-0000-0000-000000000000. ================================================================== BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru read-write to 0xffff888237d2ba28 of 8 bytes by task 12 on cpu 1: bh_lru_install fs/buffer.c:1337 [inline] __find_get_block+0x42e/0x890 fs/buffer.c:1400 bdev_getblk+0x30/0x3b0 fs/buffer.c:1425 sb_getblk_gfp include/linux/buffer_head.h:392 [inline] __read_extent_tree_block+0xb0/0x480 fs/ext4/extents.c:565 ext4_find_extent+0x501/0x7c0 fs/ext4/extents.c:938 ext4_ext_map_blocks+0x11f/0x35c0 fs/ext4/extents.c:4205 ext4_map_create_blocks fs/ext4/inode.c:516 [inline] ext4_map_blocks+0x5aa/0xd20 fs/ext4/inode.c:702 ext4_convert_unwritten_extents+0x16c/0x2c0 fs/ext4/extents.c:4876 ext4_convert_unwritten_io_end_vec+0xa2/0x110 fs/ext4/extents.c:4915 ext4_end_io_end fs/ext4/page-io.c:185 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:258 [inline] ext4_end_io_rsv_work+0x17d/0x360 fs/ext4/page-io.c:272 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x4db/0xa20 kernel/workqueue.c:3319 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3400 kthread+0x4ae/0x520 kernel/kthread.c:464 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 read to 0xffff888237d2ba28 of 8 bytes by task 3299 on cpu 0: has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1521 cpu_needs_drain mm/swap.c:780 [inline] __lru_add_drain_all+0x23f/0x3f0 mm/swap.c:867 lru_add_drain_all+0x10/0x20 mm/swap.c:883 invalidate_bdev+0x47/0x70 block/bdev.c:101 ext4_put_super+0x571/0x810 fs/ext4/super.c:1356 generic_shutdown_super+0xe5/0x220 fs/super.c:642 kill_block_super+0x2a/0x70 fs/super.c:1710 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7368 deactivate_locked_super+0x7d/0x1c0 fs/super.c:473 deactivate_super+0x9f/0xb0 fs/super.c:506 cleanup_mnt+0x268/0x2e0 fs/namespace.c:1413 __cleanup_mnt+0x19/0x20 fs/namespace.c:1420 task_work_run+0x13a/0x1a0 kernel/task_work.c:227 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:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xa8/0x120 kernel/entry/common.c:218 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0xffff8881065bc1a0 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3299 Comm: syz-executor Not tainted 6.14.0-rc5-syzkaller-00214-g21e4543a2e2f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ==================================================================