I haven’t done a public-facing writeup on this, but this public-facing writeup shows how to solve a harder version of the same bug. SQLiteDatabaseCorruptException: database disk image is malformed. Here was my fix, which didn’t touch SQLite code at all and instead ensured that, in this code, writes to a file descriptor only happen on the thread that will close the file descriptor. I then searched for "stop" to find the code that caused the issue. Once your databases get damaged, you won’t be able to fix this issue. This error usually appears due to a bug in the SQLite database and hardware failure. It is one of the most common errors faced by SQLite/SQLite3 users. Reading this corrupted area as a sequence of bytes, I saw that someone had written the C string "stop" to the DB, causing the corruption. There are many queries submitted on SQLite forums related to database disk images getting malformed. GDB showed me that an int had a value of 115, which was impossible if only SQLite were writing to the DB file. I then compiled it with all optimizations off, and stepped through it with GDB.
I was able to debug this issue by writing a C program that ran PRAGMA integrity_check on my DB.
When you write to a closed file descriptor, you’re playing Russian Roulette with the files you currently have open, and there’s a chance you’ll write unspecified data to an unspecified place in your SQLite DB, instead of writing to the file you wanted to write to. Are you facing error 'SQLite Database Disk Image Is Malformed' then learn how to fix this error in an efficient way with this helpful blog. Error: stepping, database disk image is malformed (11) (1) By Reinhard Nil (rnissl ) on 15:59:50 link source I've used the following code sequence for several years up to and including version 3.31. The root cause of the corruption was that unrelated code in HHVM was sometimes writing to a closed file descriptor.
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