From: "nobu (Nobuyoshi Nakada)" <nobu@...>
Date: 2013-08-17T20:51:24+09:00
Subject: [ruby-core:56685] [ruby-trunk - Bug #8795][Feedback] "Null byte in	string error" on Marshal.load


Issue #8795 has been updated by nobu (Nobuyoshi Nakada).

Status changed from Assigned to Feedback

How was this data generated?
Using 3rd party's library or something?
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Bug #8795: "Null byte in string error" on Marshal.load
https://bugs.ruby-lang.org/issues/8795#change-41217

Author: mml (McClain Looney)
Status: Feedback
Priority: Normal
Assignee: naruse (Yui NARUSE)
Category: core
Target version: 
ruby -v: ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


I have about 2M serialized ruby objects in a database (don't ask). The objects are serialized via Marshal.dump, then zipped, then base64 encoded before being saved.  After upgrading to 2.0 (built from source), a tiny minority (3-4) of objects thusly stored will fail to Marshal.load, with "ArgumentError: Null byte in string"

Given that the other 1.9M objects load just fine, and the issue never manifested in 1.8.7 MRI, and further, that the zip CRC's & such were not corrupted, I suspect there may be some subtle bug in the Marshal.dump code.

Please see attached file for a sample.  I'd be happy if there'd even be any way to "fix" said broken string, or even any insight into what might be going on, but I'm more worried that there may be a Marshal bug lurking..


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