[Bug nscd/26130] New: Inconsistent nscd cache during pruning

[Bug nscd/26130] New: Inconsistent nscd cache during pruning

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26130

            Bug ID: 26130
           Summary: Inconsistent nscd cache during pruning
           Product: glibc
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nscd
          Assignee: unassigned at sourceware dot org
          Reporter: schwab@linux-m68k.org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

During cache pruning the nscd cache is temparily inconsistent which is visible
to clients that read a shared cache.

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[Bug nscd/26130] Inconsistent nscd cache during pruning

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26130

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
Created attachment 12633
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12633&action=edit
getent.c

Run this in separate shells:

S1# while :; do touch /etc/group; done
S2# ./getent root
S3# ./getent wheel

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[Bug nscd/26130] Inconsistent nscd cache during pruning

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26130

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.33
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
Fixed in 2.33.

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[Bug nscd/26130] Inconsistent nscd cache during pruning

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26130

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fweimer at redhat dot com

--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
commit 5e74e6f85842892bc25da8e8c70d8dadd485941a
Author: Andreas Schwab <schwab@suse.de>
Date:   Wed Jun 17 16:05:13 2020 +0200

    nscd: bump GC cycle during cache pruning (bug 26130)

    While nscd prunes a cache it becomes inconsistent temporarily, which is
    visible to clients if that cache is shared.  Bump the GC cycle counter so
    that the clients notice the modification window.

    Uniformly use atomic_fetch_add to modify the GC cycle counter.

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