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Bug #4168
closedRAN decode: BSSMAP: BSSMAP data truncated, discarding message
Start date:
08/22/2019
Due date:
% Done:
100%
Resolution:
Spec Reference:
Description
We're running Osmocom based network at the CCCamp 2019. I noticed the following errors happening quite often (~once per second):
Thu Aug 22 15:54:52 2019 DBSSAP ERROR libmsc/ran_msg_a.c:764 msc_a(IMSI-26242340300XXXX:MSISDN-XXXX:TMSI-0xA73E055A:GERAN-A-77923:LU)[0x5563947521e0]{MSC_A_ST_AUTH_CIPH}: RAN decode: BSSMAP: BSSMAP data truncated, discarding message Thu Aug 22 15:54:53 2019 DBSSAP ERROR libmsc/ran_msg_a.c:764 msc_a(IMSI-26242340300XXXX:MSISDN-XXXX:TMSI-0xA8EFE03F:GERAN-A-77925:LU)[0x5563947c0250]{MSC_A_ST_AUTH_CIPH}: RAN decode: BSSMAP: BSSMAP data truncated, discarding message Thu Aug 22 15:54:53 2019 DBSSAP ERROR libmsc/ran_msg_a.c:764 msc_a(IMSI-26242340300XXXX:MSISDN-XXXX:TMSI-0x5B526072:GERAN-A-77927:LU)[0x5563946f3d70]{MSC_A_ST_AUTH_CIPH}: RAN decode: BSSMAP: BSSMAP data truncated, discarding message
Updated by neels over 4 years ago
DVLR NOTICE SUBSCR(...) gratuitous ID RESPONSE?!? (vlr.c:1182) DBSSAP ERROR msc_a(...)[0x5563947ace40]{MSC_A_ST_AUTHENTICATED}: RAN decode: BSSMAP: BSSMAP data truncated, discarding message (ran_msg_a.c:764)
I've got a pcap, but would rather not publish it.
I managed to get the "gratuitous" message reproduced in a C test, but not the "data truncated" part...
Still looking.
Updated by neels over 4 years ago
The "gratuitous ID RESPONSE" message comes up because no vlr_subscr->lu_fsm is present.
It happens for all non-LU Layer3-Complete that do ciphering: Paging response or CM Service Request.
So the error message is completely bogus on those cases.
Updated by neels over 4 years ago
https://gerrit.osmocom.org/c/osmo-msc/+/15317 fixes the "truncated" error
Updated by neels over 4 years ago
- Status changed from New to In Progress
- % Done changed from 0 to 90
Updated by neels over 4 years ago
- Status changed from In Progress to Resolved
- % Done changed from 90 to 100
merged months ago
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