Details
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Bug
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Resolution: Fixed
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Major
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3.1.4
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Untriaged
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Unknown
Description
There is a data race on DcpConsumer::backoffs, as identified by ThreadSanitizer (see below). This variable is only used for statistics (total_backoffs and the per-connection "%s:backoff"), so the race is benign.
As reported by ThreadSanitizer:
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WARNING: ThreadSanitizer: data race (pid=24629)
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Read of size 4 at 0x7d5000016b9c by main thread (mutexes: write M27034, write M2479):
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#0 void ConnHandler::addStat<unsigned int>(), void const*) ep-engine/src/tapconnection.h:291:18 (ep.so+0x00000004e993)
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#1 DcpConsumer::addStats(), void const*) ep-engine/src/dcp/consumer.cc:731:5 (ep.so+0x00000005a2c3)
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...
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Previous write of size 4 at 0x7d5000016b9c by thread T10:
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#0 DcpConsumer::processBufferedItems() ep-engine/src/dcp/consumer.cc:755:17 (ep.so+0x0000000539c3)
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#1 Processer::run() ep-engine/src/dcp/consumer.cc:57:13 (ep.so+0x00000005376b)
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#2 ExecutorThread::run() ep-engine/src/executorthread.cc:115:26 (ep.so+0x0000000e944e)
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Note: already fixed in watson: http://review.couchbase.org/55924
Attachments
Issue Links
- blocks
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MB-19323 3.1.6 release
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- Closed
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| For Gerrit Dashboard: MB-19259 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 62977,8 | MB-19259: Fix data race on DcpConsumer::backoffs | 3.0.x | ep-engine | Status: MERGED | +2 | +1 |
| 65187,3 | Merge remote-tracking branch 'couchbase/3.0.x' into sherlock | sherlock | ep-engine | Status: MERGED | +2 | +1 |
| 66012,1 | Merge commit 'couchbase/sherlock' into 'couchbase/watson' | watson | ep-engine | Status: ABANDONED | 0 | -1 |
| 66060,5 | Merge remote-tracking branch 'couchbase/sherlock' into 'couchbase/watson' | watson | ep-engine | Status: MERGED | +2 | +1 |