openldap-bugs

openldap-bugs@openldap.org

1 participants
21518 discussions

[Issue 9397] New: LMDB: A second process opening a file with MDB_WRITEMAP can cause the first to SIGBUS
by openldap-its＠openldap.org 22 Apr '26

22 Apr '26

https://bugs.openldap.org/show_bug.cgi?id=9397 Issue ID: 9397 Summary: LMDB: A second process opening a file with MDB_WRITEMAP can cause the first to SIGBUS Product: LMDB Version: 0.9.26 Hardware: All OS: All Status: UNCONFIRMED Severity: normal Priority: --- Component: liblmdb Assignee: bugs(a)openldap.org Reporter: github(a)nicwatson.org Target Milestone: --- Created attachment 780 --> https://bugs.openldap.org/attachment.cgi?id=780&action=edit Full reproduction of SIGBUS MDB_WRITEMAP issue (works on Linux only) The fundamental problem is that a ftruncate() on Linux that makes a file smaller will cause accesses past the new end of the file to SIGBUS (see the mmap man page). The sequence that causes a SIGBUS involves two processes. 1. The first process opens a new LMDB file with MDB_WRITEMAP. 2. The second process opens the same LMDB file with MDB_WRITEMAP and with an explicit map_size smaller than the first process's map size. * This causes an ftruncate that makes the underlying file *smaller*. 3. (Optional) The second process closes the environment and exits. 4. The first process opens a write transaction and writes a bunch of data. 5. The first process commits the transaction. This causes a memory read from the mapped memory that's now past the end of the file. On Linux, this triggers a SIGBUS. Attached is code that fully reproduces the problem on Linux. The most straightforward solution is to allow ftruncate to *reduce* the file size if it is the only reader. Another possibility is check the file size and ftruncate if necessary every time a write transaction is opened. A third possibility is to catch the SIGBUS signal. Repro note: I used clone() to create the subprocess to most straightforwardly demonstrate that the problem is not due to inherited file descriptors. The problem still manifests when the processes are completely independent. -- You are receiving this mail because: You are on the CC list for the issue.

1 11

[Issue 8582] LMDB lockfile/mutex arch dependency
by openldap-its＠openldap.org 22 Apr '26

22 Apr '26

https://bugs.openldap.org/show_bug.cgi?id=8582 Howard Chu <hyc(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |SUSPENDED Status|IN_PROGRESS |RESOLVED --- Comment #3 from Howard Chu <hyc(a)openldap.org> --- Doesn't look like glibc will ever be able to fix this. -- You are receiving this mail because: You are on the CC list for the issue.

1 0

[Issue 8620] GCC error undeclared PTHREAD_MUTEX_ROBUST
by openldap-its＠openldap.org 22 Apr '26

22 Apr '26

https://bugs.openldap.org/show_bug.cgi?id=8620 Howard Chu <hyc(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #3 from Howard Chu <hyc(a)openldap.org> --- Builds fine on my Windows10 box with msys2 / mingw64 -- You are receiving this mail because: You are on the CC list for the issue.

1 0

[Bug 9207] New: Remove Moznss compatibility layer
by openldap-its＠openldap.org 22 Apr '26

22 Apr '26

https://bugs.openldap.org/show_bug.cgi?id=9207 Bug ID: 9207 Summary: Remove Moznss compatibility layer Product: OpenLDAP Version: 2.5 Hardware: All OS: All Status: UNCONFIRMED Severity: normal Priority: --- Component: libraries Assignee: bugs(a)openldap.org Reporter: quanah(a)openldap.org Target Milestone: --- For the 2.5 release, remove the MozNSS compatibility layer. -- You are receiving this mail because: You are on the CC list for the bug.

1 6

[Issue 8503] Provide proper soname to liblmdb.so.1
by openldap-its＠openldap.org 22 Apr '26

22 Apr '26

https://bugs.openldap.org/show_bug.cgi?id=8503 Howard Chu <hyc(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE --- Comment #2 from Howard Chu <hyc(a)openldap.org> --- *** This issue has been marked as a duplicate of issue 8165 *** -- You are receiving this mail because: You are on the CC list for the issue.

1 0

[Issue 8165] Add proper versioning to liblmdb
by openldap-its＠openldap.org 22 Apr '26

22 Apr '26

https://bugs.openldap.org/show_bug.cgi?id=8165 Howard Chu <hyc(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |gahr(a)gahr.ch --- Comment #2 from Howard Chu <hyc(a)openldap.org> --- *** Issue 8503 has been marked as a duplicate of this issue. *** -- You are receiving this mail because: You are on the CC list for the issue.

1 0

[Issue 8452] LMDB: mdb_env_copyfd2 can deadlock due to missing mdb_env_cthr_toggle check
by openldap-its＠openldap.org 22 Apr '26

22 Apr '26

https://bugs.openldap.org/show_bug.cgi?id=8452 Howard Chu <hyc(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE --- Comment #6 from Howard Chu <hyc(a)openldap.org> --- *** This issue has been marked as a duplicate of issue 8209 *** -- You are receiving this mail because: You are on the CC list for the issue.

1 0

[Issue 8209] Broken MDB_CP_COMPACT threading
by openldap-its＠openldap.org 22 Apr '26

22 Apr '26

https://bugs.openldap.org/show_bug.cgi?id=8209 Howard Chu <hyc(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |lmb(a)cloudflare.com --- Comment #9 from Howard Chu <hyc(a)openldap.org> --- *** Issue 8452 has been marked as a duplicate of this issue. *** -- You are receiving this mail because: You are on the CC list for the issue.

1 0

[Issue 8431] LMDB: Access newly opened database from another transaction
by openldap-its＠openldap.org 22 Apr '26

22 Apr '26

https://bugs.openldap.org/show_bug.cgi?id=8431 Howard Chu <hyc(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |WONTFIX Status|UNCONFIRMED |RESOLVED -- You are receiving this mail because: You are on the CC list for the issue.

1 0

[Issue 8406] LMDB: Assertion 'mc->mc_flags & C_INITIALIZED' with MDB_NEXT after mdb_cursor_del
by openldap-its＠openldap.org 22 Apr '26

22 Apr '26

https://bugs.openldap.org/show_bug.cgi?id=8406 Howard Chu <hyc(a)openldap.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE --- Comment #7 from Howard Chu <hyc(a)openldap.org> --- *** This issue has been marked as a duplicate of issue 10396 *** -- You are receiving this mail because: You are on the CC list for the issue.

1 0

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

openldap-bugs