MDEV-37491: Assertion (mem_root->flags & 4) == 0 failed in void *alloc_root(MEM_ROOT *, size_t)#4952
Draft
raghunandanbhat wants to merge 1 commit into11.8from
Draft
MDEV-37491: Assertion (mem_root->flags & 4) == 0 failed in void *alloc_root(MEM_ROOT *, size_t)#4952raghunandanbhat wants to merge 1 commit into11.8from
(mem_root->flags & 4) == 0 failed in void *alloc_root(MEM_ROOT *, size_t)#4952raghunandanbhat wants to merge 1 commit into11.8from
Conversation
…lloc_root(MEM_ROOT *, size_t)` Problem: Server crashes when a procedure with default parameter is executed and default value for the parameter is evaluated after the procedure's first execution. CREATE PROCEDURE p(x INT DEFAULT (SELECT 1)) ... CALL p(1); -- first exec, marks mem_root read-only CALL p(); -- tries to allocate on locked when executing DEFAULT Fix: Temporarily clear the read-only flag on the statement memory root to allow the allocation. Also adds a debug hook to verify allocation happens not more than once per prepared statement and per internal table added to the list.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
fixes MDEV-37491
Problem:
Server crashes when a procedure with default parameter is executed and default value for the parameter is evaluated after the procedure's first execution.
Fix:
Temporarily clear the read-only flag on the statement memory root to allow the allocation. Also adds a debug hook to verify allocation happens not more than once per prepared statement and per internal table added to the list.