# Deep monitoring on PHP cause segmentation faults

**URL:** <https://community.dynatrace.com/t/deep-monitoring-on-php-cause-segmentation-faults/48238>\
**Category:** Extensions\
**Tags:** php\
**Created:** [October 9, 2024, 3:36pm UTC](https://community.dynatrace.com/t/deep-monitoring-on-php-cause-segmentation-faults/48238 "2024-10-09T15:36:18Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![dda92](https://avatars.discourse-cdn.com/v4/letter/d/9f8e36/32.png) [@dda92](https://community.dynatrace.com/u/dda92)\
**Post date:** [October 9, 2024, 3:36pm UTC](https://community.dynatrace.com/t/deep-monitoring-on-php-cause-segmentation-faults/48238/1 "2024-10-09T15:36:18Z")

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Since august or so, we were encountering segmentation faults in our PHP application, running under Apache+PHP-FPM. The server log mentionned the OAsubpathsender function, which points to Dynatrace OneAgent. Indeed, segmentation faults no longer occur when deep monitoring for the PHP technology is disabled.  
This appeared in OneAgent version 1.297 and still present in version 1.299, as currently deployed on our servers.

I hope that this problem will be resolved in future versions of OneAgent and that we will be able to re-enable deep monitoring again soon.

thanks

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**Author:** ![AntonPineiro](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/antonpineiro/32/49_2.png) [@AntonPineiro](https://community.dynatrace.com/u/AntonPineiro)\
**Post date:** [October 10, 2024, 6:44am UTC](https://community.dynatrace.com/t/deep-monitoring-on-php-cause-segmentation-faults/48238/2 "2024-10-10T06:44:29Z")

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Hi,

I would raise a support ticket about this.

Best regards

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**Author:** ![dda92](https://avatars.discourse-cdn.com/v4/letter/d/9f8e36/32.png) [@dda92](https://community.dynatrace.com/u/dda92)\
**Post date:** [October 10, 2024, 8:05am UTC](https://community.dynatrace.com/t/deep-monitoring-on-php-cause-segmentation-faults/48238/3 "2024-10-10T08:05:39Z")

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Yes, already done (#371813 and #385832) but they said to ask here…

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**Author:** ![Julius\_Loman](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/julius_loman/32/51_2.png) [@Julius\_Loman](https://community.dynatrace.com/u/Julius_Loman)\
**Post date:** [October 10, 2024, 10:41am UTC](https://community.dynatrace.com/t/deep-monitoring-on-php-cause-segmentation-faults/48238/4 "2024-10-10T10:41:34Z")

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If it doesn’t happen with deep monitoring disabled, then it’s clearly an instrumentation issue. Please check first if your versions are supported (likely yes) and as you already have support ticket opened, reach out to your CSM or Dynatrace representative for escalation.