EXT4-fs (loop1): unmounting filesystem 00000000-0000-0000-0000-000000000000.
==================================================================
BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

read-write to 0xffff888237d2b650 of 8 bytes by task 25672 on cpu 1:
 bh_lru_install fs/buffer.c:1340 [inline]
 __find_get_block+0x438/0x8c0 fs/buffer.c:1403
 __getblk_slow fs/buffer.c:1130 [inline]
 bdev_getblk+0x15e/0x420 fs/buffer.c:1429
 ext4_sb_breadahead_unmovable+0x44/0x190 fs/ext4/super.c:264
 __ext4_get_inode_loc+0x7a5/0x8f0 fs/ext4/inode.c:4452
 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4482 [inline]
 __ext4_iget+0x311/0x1e80 fs/ext4/inode.c:4704
 __ext4_fill_super fs/ext4/super.c:5468 [inline]
 ext4_fill_super+0x2f90/0x39d0 fs/ext4/super.c:5699
 get_tree_bdev+0x253/0x2e0 fs/super.c:1632
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5731
 vfs_get_tree+0x56/0x1d0 fs/super.c:1797
 do_new_mount+0x227/0x690 fs/namespace.c:3352
 path_mount+0x49b/0xb30 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3875
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3875
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

read to 0xffff888237d2b650 of 8 bytes by task 24445 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1510
 smp_call_function_many_cond+0x2f6/0xc50 kernel/smp.c:808
 on_each_cpu_cond_mask+0x3c/0x90 kernel/smp.c:1023
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1519
 kill_bdev block/bdev.c:84 [inline]
 blkdev_flush_mapping+0xb8/0x1c0 block/bdev.c:651
 blkdev_put_whole block/bdev.c:682 [inline]
 bdev_release+0x4d2/0x620 block/bdev.c:1051
 blkdev_release+0x15/0x20 block/fops.c:628
 __fput+0x2c1/0x660 fs/file_table.c:422
 ____fput+0x15/0x20 fs/file_table.c:450
 task_work_run+0x13a/0x1a0 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0xbe/0x130 kernel/entry/common.c:212
 do_syscall_64+0xe2/0x1d0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

value changed: 0xffff88813e292b60 -> 0xffff88813e292a90

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24445 Comm: syz-executor.1 Tainted: G        W          6.8.0-syzkaller-11743-ga4145ce1e7bc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
==================================================================
EXT4-fs (loop1): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop1): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop1): unmounting filesystem 00000000-0000-0000-0000-000000000000.