KCSAN: data-race in has_bh_in_lru / invalidate_bh

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (10) ext4 race:benign prio:high	6	1	22d	22d	0/29	moderation: reported on 2026/08/25 03:54
upstream	KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (4) ext4	6	80	869d	1014d	0/29	auto-obsoleted due to no activity on 2024/06/03 21:44
upstream	KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (8) ext4	6	9	286d	458d	0/29	auto-obsoleted due to no activity on 2026/01/28 21:28
upstream	KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (5) ext4	6	13	696d	813d	0/29	auto-obsoleted due to no activity on 2024/11/24 11:50
upstream	KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru fs	6	14	2414d	2481d	0/29	auto-closed as invalid on 2020/04/15 20:03
upstream	KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (2) ext4 exfat	6	213	1350d	1811d	0/29	auto-obsoleted due to no activity on 2023/02/08 20:39
upstream	KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (6) ext4	6	1	657d	657d	0/29	auto-obsoleted due to no activity on 2025/01/22 20:51
upstream	KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (7) ext4	6	6	519d	593d	0/29	auto-obsoleted due to no activity on 2025/06/09 21:46
upstream	KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (9) prio:high ext4	6	6	98d	216d	0/29	auto-obsoleted due to no activity on 2026/08/05 13:03

================================================================== BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru write to 0xffff888237c296b8 of 8 bytes by task 20961 on cpu 0: __invalidate_bh_lrus fs/buffer.c:1381 [inline] invalidate_bh_lru+0x9f/0xf0 fs/buffer.c:1393 smp_call_function_many_cond+0x4e4/0x640 kernel/smp.c:978 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1155 on_each_cpu_cond include/linux/smp.h:105 [inline] invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1412 kill_bdev block/bdev.c:75 [inline] blkdev_flush_mapping+0xb6/0x1c0 block/bdev.c:662 blkdev_put_whole block/bdev.c:693 [inline] blkdev_put+0x36d/0x470 block/bdev.c:953 kill_block_super+0x83/0xa0 fs/super.c:1389 deactivate_locked_super+0x6b/0xd0 fs/super.c:332 deactivate_super+0x9b/0xb0 fs/super.c:363 cleanup_mnt+0x23e/0x2a0 fs/namespace.c:1291 __cleanup_mnt+0x19/0x20 fs/namespace.c:1298 task_work_run+0x123/0x160 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff888237c296b8 of 8 bytes by task 3140 on cpu 1: has_bh_in_lru+0x35/0x1e0 fs/buffer.c:1403 smp_call_function_many_cond+0x300/0x640 kernel/smp.c:935 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1155 on_each_cpu_cond include/linux/smp.h:105 [inline] invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1412 kill_bdev block/bdev.c:75 [inline] blkdev_flush_mapping+0xb6/0x1c0 block/bdev.c:662 blkdev_put_whole block/bdev.c:693 [inline] blkdev_put+0x36d/0x470 block/bdev.c:953 kill_block_super+0x83/0xa0 fs/super.c:1389 deactivate_locked_super+0x6b/0xd0 fs/super.c:332 deactivate_super+0x9b/0xb0 fs/super.c:363 cleanup_mnt+0x23e/0x2a0 fs/namespace.c:1291 __cleanup_mnt+0x19/0x20 fs/namespace.c:1298 task_work_run+0x123/0x160 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0xffff88810ab63b60 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3140 Comm: syz-executor.3 Not tainted 6.2.0-rc8-syzkaller-00098-gec35307e18ba-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 ================================================================== EXT4-fs (loop3): unmounting filesystem 00000000-0000-0000-0000-000000000000.