Creation of large file containers fails on 1.26.7, no container created

[Kay Ceen]

Hello!
There seems to be a bug in VeraCrypt 1.26.7 on Linux related to large file containers.
I tried creating an encrypted file container using the new stable version 1.26.7 on two Linux systems running Ubuntu 23.10 and Tails 5.20. An entire empty 500GB drive was to be used by the container (checked 'use all available free space') in ext4 file system. Encryption algorithm used was the cascade AES-Twofish-Serpent, hash algorithm was Blake2s.

Apart from GUI glitches (the volume PIM window can only be completed with enter, klicking 'next' does not work) everything seemed fine. Veracrypt encrypted the container for several hours and reported success when finished but the success dialog window was unusual and also contained a red one-way sign on the left with more text below I did not remember. The volume creation wizard window did not close and no file was created on the target drive. The file is just not there and the drive remained empty. So the entire process was for nothing. This is reproducible for me, I tried it on a laptop and a PC running different Linux operating systems and encrypted different drives (a SATA HDD and an SD card). Same error, no file container created.

It worked fine on VeraCrypt1.25 (same cascade algorithm but SHA512 as hash) but the new version still seems buggy. I tried creating small volumes up to 2GB which works as it should, The problem only seems to appear when the volume is very large but I have not tested this extensively as it takes 5-6h to complete. It definitely fails on a 512GB SD card and a 512GB SATA drive.

[Ludovic]

Hello, Ive had the same problem today, but it was with the 1.25.9 version and a 450 MB file container in a 450 MB NTFS Partition, I've let VC choose the biggest possible size for the file.
After one hour, almost at the end, it gives an error popup about something as "no space left" and then I exited the application and ther was no file created in the partition.

[morton]

I have reproduced this error. In the process of creating a container using "use all available free space" option in the process of formatting a container the space on the ext4 partition becomes equal to zero. Container file just impossible to create after that. It is reproduced with both ntfs and ext4 formatted container. Reproduced on Linux Mint 21.1, VeraCrypt 2.26.7 and kernel 6.5.0-1009-oem using AES algorythm. Please note, that unlike in original poster case, the issue was reproduced on ext4 partition.

[Ludovic]

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