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

write to 0xffff888237d2a388 of 8 bytes by task 3100 on cpu 1:
 __invalidate_bh_lrus fs/buffer.c:1493 [inline]
 invalidate_bh_lru+0x88/0xf0 fs/buffer.c:1505
 csd_do_func kernel/smp.c:131 [inline]
 smp_call_function_many_cond+0x697/0xc20 kernel/smp.c:826
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1003
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1524
 invalidate_bdev+0x55/0x80 block/bdev.c:85
 ext4_put_super+0x502/0x7f0 fs/ext4/super.c:1340
 generic_shutdown_super+0xd9/0x260 fs/super.c:499
 kill_block_super+0x3b/0x60 fs/super.c:1417
 deactivate_locked_super+0x6b/0xd0 fs/super.c:330
 deactivate_super+0x9b/0xb0 fs/super.c:361
 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: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 0xffff888237d2a388 of 8 bytes by task 12149 on cpu 0:
 has_bh_in_lru+0x35/0x1e0 fs/buffer.c:1515
 smp_call_function_many_cond+0x2e4/0xc20 kernel/smp.c:788
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1003
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1524
 kill_bdev block/bdev.c:75 [inline]
 set_blocksize+0x260/0x290 block/bdev.c:152
 sb_set_blocksize+0x2d/0xb0 block/bdev.c:161
 ext4_load_super fs/ext4/super.c:5093 [inline]
 __ext4_fill_super fs/ext4/super.c:5221 [inline]
 ext4_fill_super+0xa6c/0x38b0 fs/ext4/super.c:5696
 get_tree_bdev+0x2b4/0x3b0 fs/super.c:1318
 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5728
 vfs_get_tree+0x51/0x190 fs/super.c:1519
 do_new_mount+0x203/0x660 fs/namespace.c:3335
 path_mount+0x496/0xb30 fs/namespace.c:3662
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3861
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff88810a05b7b8 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12149 Comm: syz-executor.5 Not tainted 6.5.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
==================================================================
EXT4-fs (loop5): feature flags set on rev 0 fs, running e2fsck is recommended
EXT4-fs (loop5): warning: checktime reached, running e2fsck is recommended
[EXT4 FS bs=4096, gc=1, bpg=32768, ipg=32, mo=a842c01c, mo2=0002]
System zones: 0-2, 18-18, 34-34
EXT4-fs warning (device loop5): ext4_update_dynamic_rev:1084: updating to rev 1 because of new feature flag, running e2fsck is recommended
EXT4-fs (loop5): 1 truncate cleaned up