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When an MS sends an Attach Request with a known IMSI or P-TMSI, it
implies the MS has restarted and lost all its PDP context state.  The
SGSN must clean up any PDP contexts it still holds for that subscriber;
otherwise it will not create new ones upon subsequent PDP Context
Activation, causing data connectivity failure after a device reboot.

Change-Id: I20c1f5f741275115635188b2f4b1c5fe7c6e40f1
Related: OS#6922
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When an MS sends an Attach Request with a known IMSI or P-TMSI, it
implies the MS has restarted and lost all its PDP context state.  The
SGSN must clean up any PDP contexts it still holds for that subscriber;
otherwise it will not create new ones upon subsequent PDP Context
Activation, causing data connectivity failure after a device reboot.

Change-Id: I20c1f5f741275115635188b2f4b1c5fe7c6e40f1
Related: OS#6922
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--enable-iu,1,a3=default,a4=default,osmocom-gerrit #572</fullDisplayName><id>572</id><inProgress>false</inProgress><keepLog>false</keepLog><number>572</number><queueId>82912</queueId><result>SUCCESS</result><timestamp>1775568580856</timestamp><url>https://jenkins.osmocom.org/jenkins/job/gerrit-osmo-sgsn-build/IU=--enable-iu,WITH_MANUALS=1,a3=default,a4=default,label=osmocom-gerrit/572/</url><builtOn>build5-deb12build-ansible</builtOn><changeSet _class='hudson.plugins.git.GitChangeSetList'><item _class='hudson.plugins.git.GitChangeSet'><affectedPath>src/sgsn/gprs_gmm.c</affectedPath><commitId>0150b0c4fd3c7979830d4c47f0135857cdb53548</commitId><timestamp>1775568561000</timestamp><author><absoluteUrl>https://jenkins.osmocom.org/jenkins/user/fixeria</absoluteUrl><fullName>Vadim Yanitskiy</fullName></author><authorEmail>vyanitskiy@sysmocom.de</authorEmail><comment>gprs_gmm: gsm48_rx_gmm_att_req(): drop stale PDP contexts on re-Attach

When an MS sends an Attach Request with a known IMSI or P-TMSI, it
implies the MS has restarted and lost all its PDP context state.  The
SGSN must clean up any PDP contexts it still holds for that subscriber;
otherwise it will not create new ones upon subsequent PDP Context
Activation, causing data connectivity failure after a device reboot.

Change-Id: I20c1f5f741275115635188b2f4b1c5fe7c6e40f1
Related: OS#6922
</comment><date>2026-04-07 13:29:21 +0000</date><id>0150b0c4fd3c7979830d4c47f0135857cdb53548</id><msg>gprs_gmm: gsm48_rx_gmm_att_req(): drop stale PDP contexts on re-Attach</msg><path><editType>edit</editType><file>src/sgsn/gprs_gmm.c</file></path></item><kind>git</kind></changeSet><culprit><absoluteUrl>https://jenkins.osmocom.org/jenkins/user/fixeria</absoluteUrl><fullName>Vadim Yanitskiy</fullName></culprit></run></matrixBuild>