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Bug #74920 original session id locked after using session_regenerate_id()
Submitted: 2017-07-13 17:57 UTC Modified: 2021-03-25 16:40 UTC
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: javier at villanueva dot cl Assigned: cmb (profile)
Status: Closed Package: memcache (PECL)
PHP Version: Irrelevant OS: Centos 6
Private report: No CVE-ID: None
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From: javier at villanueva dot cl
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 [2017-07-13 17:57 UTC] javier at villanueva dot cl
After using session_regenerate_id(), the memcache session extension doesn't free the lock associated to the original session_id, so if you want to reuse it you have to wait memcache.lock_timeout seconds to pass.

Test script:
<!-- begin script1.php -->
session_id( 'testid' );
session_regenerate_id(); // new randomly assigned id

<!-- begin script2.php -->
session_id( 'testid' );
$t = time();
print "Elapsed: ".( $t - time() ); // here will display some value near memcache.lock_timeout

Expected result:
Elapsed: 0

Actual result:
Elapsed: 15


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 [2021-03-25 16:40 UTC]
-Status: Open +Status: Closed -Assigned To: +Assigned To: cmb
 [2021-03-25 16:40 UTC]
The official bug tracker for PECL/memcache is now at

So, if this is still an issue with either of the current memcache
versions (4 or 8), please file an issue there.
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