Re: [BUG] ecryptfs leaks an inode on lookup failure -> kernel BUG in generic_shutdown_super()

[Tyler Hicks]

On 2026-08-27 20:18:11, Farhad Alemi wrote:
> Hello,

Hi - Thank you for the report.

> As part of the kernel research at ASU's SEFCOM
> lab, we hit the crash below. Crash reports can be found here:
> 
>   https://github.com/farhad-alemi/public_bug_reports/tree/main/128-ecryptfs-i_new-inode-leak-lookup-failure/
> 
>   ecryptfs_i_size_read: Error attempting to initialize the lower file
> for the dentry with name [victim]; rc = [-26]
>   VFS: Busy inodes after unmount of ecryptfs (ecryptfs)
>   kernel BUG at fs/super.c:779!
>   Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
>   Call Trace:
>    kill_anon_super+0x3b/0x70
>    ecryptfs_kill_block_super+0x44/0xa0
>    deactivate_locked_super+0xbc/0x110
>    cleanup_mnt+0x437/0x4d0
>    task_work_run+0x1d9/0x270
>    exit_to_user_mode_loop+0x14e/0x540
>    do_syscall_64+0x317/0x510
>   Kernel panic - not syncing: Fatal exception
> 
> Our reproducer.c is available upon request.

Yes, please provide reproducer.c.

Tyler

> Happy to test a patch if that would help.
> 
> Regards,