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BUG: KCSAN: data-race in find_get_block_common / has_bh_in_lru

read-write to 0xffff888237d26f10 of 8 bytes by task 11385 on cpu 1:
 bh_lru_install fs/buffer.c:1351 [inline]
 find_get_block_common+0x4f0/0x960 fs/buffer.c:1416
 __getblk_slow fs/buffer.c:-1 [inline]
 bdev_getblk+0x325/0x3d0 fs/buffer.c:1467
 getblk_unmovable include/linux/buffer_head.h:371 [inline]
 ext4_getblk+0x1b6/0x510 fs/ext4/inode.c:975
 ext4_bread_batch+0x5c/0x320 fs/ext4/inode.c:1044
 __ext4_find_entry+0x840/0xf40 fs/ext4/namei.c:1601
 ext4_lookup_entry fs/ext4/namei.c:1703 [inline]
 ext4_lookup+0xbb/0x390 fs/ext4/namei.c:1771
 lookup_one_qstr_excl_raw+0xc4/0x1b0 fs/namei.c:1689
 lookup_one_qstr_excl fs/namei.c:1711 [inline]
 filename_create+0x14a/0x290 fs/namei.c:4140
 do_symlinkat+0x65/0x3c0 fs/namei.c:4749
 __do_sys_symlink fs/namei.c:4777 [inline]
 __se_sys_symlink fs/namei.c:4775 [inline]
 __x64_sys_symlink+0x50/0x60 fs/namei.c:4775
 x64_sys_call+0x2d8d/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:89
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d26f10 of 8 bytes by task 9653 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1557
 smp_call_function_many_cond+0x389/0xbf0 kernel/smp.c:838
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1052
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1566
 kill_bdev block/bdev.c:90 [inline]
 blkdev_flush_mapping+0x9a/0x1a0 block/bdev.c:712
 blkdev_put_whole block/bdev.c:719 [inline]
 bdev_release+0x2bf/0x3d0 block/bdev.c:1144
 blkdev_release+0x15/0x20 block/fops.c:684
 __fput+0x298/0x650 fs/file_table.c:465
 ____fput+0x1c/0x30 fs/file_table.c:493
 task_work_run+0x12e/0x1a0 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe4/0x100 kernel/entry/common.c:114
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff888104d51e38

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9653 Comm: syz-executor Not tainted 6.16.0-rc1-syzkaller-00203-g4774cfe3543a #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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