==================================================================
BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru

write to 0xffff888237d2a448 of 8 bytes by task 3103 on cpu 1:
 __invalidate_bh_lrus fs/buffer.c:1487 [inline]
 invalidate_bh_lru+0x88/0xf0 fs/buffer.c:1499
 csd_do_func kernel/smp.c:133 [inline]
 smp_call_function_many_cond+0x697/0xc20 kernel/smp.c:835
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1012
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1518
 kill_bdev block/bdev.c:75 [inline]
 blkdev_flush_mapping+0xb6/0x1c0 block/bdev.c:630
 blkdev_put_whole block/bdev.c:661 [inline]
 blkdev_put+0x33a/0x470 block/bdev.c:898
 kill_block_super+0x47/0x60 fs/super.c:1649
 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7305
 deactivate_locked_super+0x73/0x1c0 fs/super.c:481
 deactivate_super+0x9b/0xb0 fs/super.c:514
 cleanup_mnt+0x272/0x2e0 fs/namespace.c:1254
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1261
 task_work_run+0x135/0x1a0 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd6/0xe0 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: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 0xffff888237d2a448 of 8 bytes by task 3098 on cpu 0:
 has_bh_in_lru+0x35/0x1e0 fs/buffer.c:1509
 smp_call_function_many_cond+0x2e4/0xc20 kernel/smp.c:797
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1012
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1518
 kill_bdev block/bdev.c:75 [inline]
 blkdev_flush_mapping+0xb6/0x1c0 block/bdev.c:630
 blkdev_put_whole block/bdev.c:661 [inline]
 blkdev_put+0x33a/0x470 block/bdev.c:898
 kill_block_super+0x47/0x60 fs/super.c:1649
 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7305
 deactivate_locked_super+0x73/0x1c0 fs/super.c:481
 deactivate_super+0x9b/0xb0 fs/super.c:514
 cleanup_mnt+0x272/0x2e0 fs/namespace.c:1254
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1261
 task_work_run+0x135/0x1a0 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd6/0xe0 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: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: 0xffff88810044e618 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3098 Comm: syz-executor.2 Not tainted 6.6.0-rc3-syzkaller-00055-g9ed22ae6be81 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
==================================================================
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.