Description
Incompatibility has been found between server versions that don't have collections support and dcp handling inside cbgt. In sync gateway we disable dcp streamIDs when connecting to a bucket from a server version < 7.0. During initialisation of sync gateway import feed using cbgt we have hit a panic using server version < 7.0. As we disableStreamIDs for those versions we then hit this line inside cbgt -> https://github.com/couchbase/cbgt/blob/48f41f9f9d8529d8b72582a8bf6bb4aabd6bad79/feed_dcp_gocbcore.go#LL978C11-L978C11 which expects a streamID to be set. But in the case of this version of server it has been disabled and thus we panic trying to access a value on a nil struct.
Full panic output below:
panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xbbe48a] goroutine 1209 [running]: github.com/couchbase/cbgt.(*GocbcoreDCPFeed).initiateStreamEx.func1({0xc000747860, 0xf, 0x4edf87?}, {0x0, 0x0?}) /home/couchbase/jenkins/workspace/sgw-unix-build/3.1.0/enterprise/godeps/pkg/mod/github.com/couchbase/cbgt@v1.3.2-0.20230405201040-c0ede9925e46/feed_dcp_gocbcore.go:976 +0x64a github.com/couchbase/gocbcore/v10.(*dcpComponent).OpenStream.func1(0xc00ded89c0, 0xc000788d78?, {0x0?, 0x0?}) /home/couchbase/jenkins/workspace/sgw-unix-build/3.1.0/enterprise/godeps/pkg/mod/github.com/couchbase/gocbcore/v10@v10.2.3-0.20230412164057-d9c465de8911/dcpcomponent.go:82 +0x1317 github.com/couchbase/gocbcore/v10.(*memdQRequest).tryCallback(0xc00de3fc20, 0xc00dec8720?, {0x0, 0x0}) /home/couchbase/jenkins/workspace/sgw-unix-build/3.1.0/enterprise/godeps/pkg/mod/github.com/couchbase/gocbcore/v10@v10.2.3-0.20230412164057-d9c465de8911/memdqpackets.go:237 +0xf0 github.com/couchbase/gocbcore/v10.(*memdClient).resolveRequest(0xc00001ce00, 0xc00ded89c0) /home/couchbase/jenkins/workspace/sgw-unix-build/3.1.0/enterprise/godeps/pkg/mod/github.com/couchbase/gocbcore/v10@v10.2.3-0.20230412164057-d9c465de8911/memdclient.go:378 +0x865 github.com/couchbase/gocbcore/v10.(*memdClient).run.func2() /home/couchbase/jenkins/workspace/sgw-unix-build/3.1.0/enterprise/godeps/pkg/mod/github.com/couchbase/gocbcore/v10@v10.2.3-0.20230412164057-d9c465de8911/memdclient.go:488 +0x997 created by github.com/couchbase/gocbcore/v10.(*memdClient).run /home/couchbase/jenkins/workspace/sgw-unix-build/3.1.0/enterprise/godeps/pkg/mod/github.com/couchbase/gocbcore/v10@v10.2.3-0.20230412164057-d9c465de8911/memdclient.go:415 +0x12a |
Attachments
Issue Links
- relates to
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CBG-3043 cbgt panics when setting up import feed for server versions < 7.0
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- Closed
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