Filed by: nerli [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=366739920&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/RjYLEJasRYOM7kitGkKRGA/runs/0/artifacts/public/logs/live_backing.log

[task 2022-02-04T15:59:34.045Z] 15:59:34     INFO - AssertionError
[task 2022-02-04T15:59:34.079Z] 15:59:34     INFO - Browser exited with return code 0
[task 2022-02-04T15:59:34.079Z] 15:59:34     INFO - ERROR | LeakSanitizer | SUMMARY: AddressSanitizer: 2624 byte(s) leaked in 17 allocation(s).
[task 2022-02-04T15:59:34.080Z] 15:59:34     INFO - LeakSanitizer | To show the addresses of leaked objects add report_objects=1 to LSAN_OPTIONS
[task 2022-02-04T15:59:34.080Z] 15:59:34     INFO - This can be done in testing/mozbase/mozrunner/mozrunner/utils.py
[task 2022-02-04T15:59:34.080Z] 15:59:34     INFO - Allowed depth was 4
[task 2022-02-04T15:59:34.091Z] 15:59:34     INFO - TEST-FAIL | LeakSanitizer | leak at mozilla::WeakPtr, mozilla::DataChannelConnection::Destroy, mozilla::PeerConnectionImpl::CloseInt, mozilla::PeerConnectionImpl::Close
[task 2022-02-04T15:59:34.091Z] 15:59:34     INFO - INFO | LeakSanitizer | Frame mozilla::WeakPtr matched a expected leak
[task 2022-02-04T15:59:34.091Z] 15:59:34     INFO - TEST-FAIL | LeakSanitizer | leak at nsRefPtrDeque, mozilla::DataChannelConnection::DataChannelConnection, mozilla::DataChannelConnection::Create, mozilla::PeerConnectionImpl::EnsureDataConnection
[task 2022-02-04T15:59:34.091Z] 15:59:34     INFO - INFO | LeakSanitizer | Frame nsRefPtrDeque matched a expected leak
[task 2022-02-04T15:59:34.091Z] 15:59:34     INFO - TEST-UNEXPECTED-FAIL | LeakSanitizer | leak at MakeAndAddRef, mozilla::camera::CamerasParent::Create, mozilla::ipc::PBackgroundParent::OnMessageReceived, mozilla::ipc::MessageChannel::DispatchAsyncMessage
[task 2022-02-04T15:59:34.091Z] 15:59:34     INFO - TEST-FAIL | LeakSanitizer | leak at mozilla::DataChannelConnection::Open, mozilla::PeerConnectionImpl::CreateDataChannel, mozilla::PeerConnectionImpl::CreateDataChannel, mozilla::dom::PeerConnectionImpl_Binding::createDataChannel
[task 2022-02-04T15:59:34.091Z] 15:59:34     INFO - INFO | LeakSanitizer | Frame mozilla::DataChannelConnection::Open matched a expected leak
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - TEST-FAIL | LeakSanitizer | leak at Alloc, nsTSubstring, nsTSubstring, nsTSubstring
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - INFO | LeakSanitizer | Frame Alloc matched a expected leak
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - TEST-FAIL | LeakSanitizer | leak at mozilla::dom::DocGroup::Create, operator, OrInsertWith, operator
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - INFO | LeakSanitizer | Frame mozilla::dom::DocGroup::Create matched a expected leak
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - TEST-FAIL | LeakSanitizer | leak at allocate, allocate, _M_allocate, std::vector
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - INFO | LeakSanitizer | Frame allocate matched a expected leak
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - TEST-UNEXPECTED-FAIL | LeakSanitizer | leak at Malloc, nsTArray_base, ExtendCapacity, nsTArray_base
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - TEST-FAIL | LeakSanitizer | leak at NS_NewDOMDataChannel, mozilla::PeerConnectionImpl::CreateDataChannel, mozilla::PeerConnectionImpl::CreateDataChannel, mozilla::dom::PeerConnectionImpl_Binding::createDataChannel
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - INFO | LeakSanitizer | Frame NS_NewDOMDataChannel matched a expected leak
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - TEST-FAIL | LeakSanitizer | leak at mozilla::dom::DocGroup::DocGroup, mozilla::dom::DocGroup::Create, operator, OrInsertWith
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - INFO | LeakSanitizer | Frame mozilla::dom::DocGroup::DocGroup matched a expected leak
[task 2022-02-04T15:59:34.092Z] 15:59:34     INFO - TEST-FAIL | LeakSanitizer | leak at mozilla::DataChannelConnection::Create, mozilla::PeerConnectionImpl::EnsureDataConnection, mozilla::PeerConnectionImpl::CreateDataChannel, mozilla::PeerConnectionImpl::CreateDataChannel
[task 2022-02-04T15:59:34.093Z] 15:59:34     INFO - INFO | LeakSanitizer | Frame mozilla::DataChannelConnection::Create matched a expected leak
[task 2022-02-04T15:59:34.093Z] 15:59:34     INFO - TEST-FAIL | LeakSanitizer | leak at Alloc, nsTSubstring, Gecko_StartBulkWriteString, nsstring::nsAString::start_bulk_write_impl
[task 2022-02-04T15:59:34.093Z] 15:59:34     INFO - INFO | LeakSanitizer | Frame Alloc matched a expected leak
[task 2022-02-04T15:59:34.093Z] 15:59:34     INFO - Closing logging queue

The fix for bug 1753266 may address this.