EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
==================================================================
BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru

write to 0xffff888237c2a578 of 8 bytes by task 3090 on cpu 0:
 __invalidate_bh_lrus fs/buffer.c:1430 [inline]
 invalidate_bh_lru+0x88/0xf0 fs/buffer.c:1442
 smp_call_function_many_cond+0x518/0xa60 kernel/smp.c:819
 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
 invalidate_bdev+0x55/0x80 block/bdev.c:85
 ext4_put_super+0x502/0x800 fs/ext4/super.c:1329
 generic_shutdown_super+0xd9/0x260 fs/super.c:500
 kill_block_super+0x4e/0xa0 fs/super.c:1407
 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

read to 0xffff888237c2a578 of 8 bytes by task 3061 on cpu 1:
 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
 invalidate_bdev+0x55/0x80 block/bdev.c:85
 ext4_put_super+0x502/0x800 fs/ext4/super.c:1329
 generic_shutdown_super+0xd9/0x260 fs/super.c:500
 kill_block_super+0x4e/0xa0 fs/super.c:1407
 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: 0xffff888109de09c0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3061 Comm: syz-executor.2 Not tainted 6.4.0-rc6-syzkaller-00269-g1b29d271614a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
==================================================================
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.