openldap-bugs November 2023

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[Issue 10127] New: Thread Safety in LMDB with MDB_NOTLS and Readonly Cursors
by openldap-its＠openldap.org 07 Nov '23

07 Nov '23

https://bugs.openldap.org/show_bug.cgi?id=10127 Issue ID: 10127 Summary: Thread Safety in LMDB with MDB_NOTLS and Readonly Cursors Product: LMDB Version: unspecified Hardware: All OS: All Status: UNCONFIRMED Keywords: needs_review Severity: normal Priority: --- Component: liblmdb Assignee: bugs(a)openldap.org Reporter: xiaoya2wei(a)gmail.com Target Milestone: --- Greetings LMDB Community, I am delving into the thread-safety aspects of LMDB, specifically regarding the use of readonly cursors across multiple threads. With the MDB_NOTLS flag enabled, which disables thread-local storage, my understanding is that readonly transactions may be shared between threads, provided there is proper synchronization to prevent concurrent access. Building upon this, I seek clarity on the following: Can multiple threads safely access a single readonly cursor derived from such a synchronized readonly transaction when MDB_NOTLS is enabled? Upon reviewing the LMDB source code, I noticed that cursors are tied to transactions (see mdb.c#L1335). This suggests that if threads can synchronously share a transaction, they might also share a cursor associated with it for data retrieval. I recognize my analysis might be superficial, and I'm open to corrections. Your insights on this matter would be greatly appreciated to enhance my understanding of LMDB's concurrency mechanisms. Thank you in advance for your assistance! -- You are receiving this mail because: You are on the CC list for the issue.

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[Issue 8852] slapd memory use grows continuously with non-delta syncrepl and modifying groups
by openldap-its＠openldap.org 03 Nov '23

03 Nov '23

https://bugs.openldap.org/show_bug.cgi?id=8852 --- Comment #8 from Ondřej Kuzník <ondra(a)mistotebe.net> --- For comparison, using deltasync (and sortvals!) makes the consumer take a similar amount of CPU time (about +50-90 % on the provider's) to process the 10k value additions, just like Ryan noted earlier. On the other idea, no clue on whether we can somehow limit the amount of data queued up without severely impairing replication progress. -- You are receiving this mail because: You are on the CC list for the issue.

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[Issue 8852] slapd memory use grows continuously with non-delta syncrepl and modifying groups
by openldap-its＠openldap.org 03 Nov '23

03 Nov '23

https://bugs.openldap.org/show_bug.cgi?id=8852 --- Comment #7 from Ondřej Kuzník <ondra(a)mistotebe.net> --- Making attr_cmp do a linear sweep for sortvals attributes (instead of the quadratic match it has to do right now) makes the consumer 7-8x slower than a provider across the board with the environment provided. I might have expected something like 3-4x but that's out of scope for this particular ITS. -- You are receiving this mail because: You are on the CC list for the issue.

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[Issue 8180] back-sock should not return sucess in case of error
by openldap-its＠openldap.org 02 Nov '23

02 Nov '23

https://bugs.openldap.org/show_bug.cgi?id=8180 Howard Chu <hyc(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |IN_PROGRESS Ever confirmed|0 |1 --- Comment #2 from Howard Chu <hyc(a)openldap.org> --- https://git.openldap.org/openldap/openldap/-/merge_requests/657 -- You are receiving this mail because: You are on the CC list for the issue.

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[Issue 8677] back-sock segfaults on CONTINUE (database sock)
by openldap-its＠openldap.org 02 Nov '23

02 Nov '23

https://bugs.openldap.org/show_bug.cgi?id=8677 Howard Chu <hyc(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |IN_PROGRESS Ever confirmed|0 |1 --- Comment #3 from Howard Chu <hyc(a)openldap.org> --- https://git.openldap.org/openldap/openldap/-/merge_requests/657 -- You are receiving this mail because: You are on the CC list for the issue.

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[Issue 6198] Authorization for extensions
by openldap-its＠openldap.org 02 Nov '23

02 Nov '23

https://bugs.openldap.org/show_bug.cgi?id=6198 Quanah Gibson-Mount <quanah(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Blocks| |9204 Referenced Issues: https://bugs.openldap.org/show_bug.cgi?id=9204 [Issue 9204] slapo-constraint allows anyone to apply Relax control -- You are receiving this mail because: You are on the CC list for the issue.

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[Issue 8884] enabling overlay slapo-rwm makes 'entryDN' invisible
by openldap-its＠openldap.org 02 Nov '23

02 Nov '23

https://bugs.openldap.org/show_bug.cgi?id=8884 Quanah Gibson-Mount <quanah(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Assignee|bugs(a)openldap.org |hyc(a)openldap.org -- You are receiving this mail because: You are on the CC list for the issue.

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[Issue 8498] slapadd complains about missing attrs
by openldap-its＠openldap.org 02 Nov '23

02 Nov '23

https://bugs.openldap.org/show_bug.cgi?id=8498 Howard Chu <hyc(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |TEST Status|UNCONFIRMED |RESOLVED -- You are receiving this mail because: You are on the CC list for the issue.

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[Issue 8852] slapd memory use grows continuously with non-delta syncrepl and modifying groups
by openldap-its＠openldap.org 02 Nov '23

02 Nov '23

https://bugs.openldap.org/show_bug.cgi?id=8852 --- Comment #6 from Ondřej Kuzník <ondra(a)mistotebe.net> --- attr_cmp should check the attribute is a sortval and if so, should diff without resolving to a double loop. -- You are receiving this mail because: You are on the CC list for the issue.

1 0

[Issue 8498] slapadd complains about missing attrs
by openldap-its＠openldap.org 02 Nov '23

02 Nov '23

https://bugs.openldap.org/show_bug.cgi?id=8498 --- Comment #5 from Howard Chu <hyc(a)openldap.org> --- Fixed in master 2939df1a1dead2a11d1878ccd246660cda2b41a6 -- You are receiving this mail because: You are on the CC list for the issue.

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openldap-bugs November 2023