Bug #75415 [NEW]: shm_put_var() parallel bug.
From: abc905 at mail dot ru
Operating system: Linux Debian 4.9.0-4-amd64
PHP version: 7.1.10
Package: Semaphore related
Bug Type: Bug
Bug description:shm_put_var() parallel bug.
Description:
------------
Run test script 1-10 times to see that in spite of the fact
shm_put_var returns true, shm_has_var() returns false.
Calling sem_get() fixes the bug
Test script:
---------------
$processes = 300;
$shmem = shm_attach(ftok(__FILE__, 'f'), 100000);
// If uncomment next line shm_put_var works correctly
// $sem = sem_get(ftok(__FILE__, 'a'));
for ($i = 1; $i <= $processes; $i++) {
if (pcntl_fork() === 0) {
usleep(100000);
$pid = getmypid();
$put_ok = shm_put_var($shmem, $pid, $i);
if ($put_ok && !shm_has_var($shmem, $pid)) {
print "shm_put_var() bug\n";
}
exit(0);
}
}
while (pcntl_wait($status) !== -1){}
shm_remove($shmem);
shm_detach($shmem);
--
Edit bug report at https://bugs.php.net/bug.php?id=75415&edit=1
--
Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75415&r=trysnapshot54
Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75415&r=trysnapshot55
Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75415&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=75415&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=75415&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=75415&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=75415&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=75415&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=75415&r=support
Expected behavior: https://bugs.php.net/fix.php?id=75415&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=75415&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=75415&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=75415&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75415&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=75415&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=75415&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=75415&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=75415&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=75415&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=75415&r=mysqlcfg
Thread (3 messages)
- abc905 at mail dot ru