GPU Workflow: Fix possible deadlock with DoublePipeline when not receiving EndOfStream

[davidrohr]

No description provided.

[alibuild]

Error while checking build/O2/fullCI_slc9 for 9992aee at 2026-07-25 13:52:

## sw/BUILD/O2-full-system-test-latest/log
command o2-sim-digitizer-workflow -n 5 --simPrefixQED qed/o2sim --qed-x-section-ratio 4477.35 --disable-mc --sims sig,o2sim --tpc-lanes 24 --shm-segment-size 8000000000 -b --skipDet TRD --configKeyValues "HBFUtils.nHBFPerTF=128;HBFUtils.orbitFirst=256;HBFUtils.orbitFirstSampled=256;HBFUtils.obligatorySOR=false;HBFUtils.runNumber=310000;;HBFUtils.maxNOrbits=384;" --interactionRate 50000 --early-forward-policy always --incontext collisioncontext.root had nonzero exit code 1
[3428:internal-dpl-ccdb-backend]: [13:52:28][ERROR] CCDBDownloader CURL transfer error - Timeout was reached
[3428:internal-dpl-ccdb-backend]: [13:52:28][ERROR] CcdbDownloader finished transfer http://alice-ccdb.cern.ch/CTP/Calib/OrbitReset for 1550600800000 (agent_id: o2-sim-digitize/o2-sim-digitizer-workflow@3428 target/Linux_x86_64 init/1784980337786 id/mesosci@alimetal07.cern.ch session/8FQvbqNs) with http code: 0
[3428:internal-dpl-ccdb-backend]: [13:52:28][ERROR] File CTP/Calib/OrbitReset could not be retrieved. No more hosts to try.
[3428:internal-dpl-ccdb-backend]: [13:52:28][FATAL] Unable to find CCDB object CTP/Calib/OrbitReset/1550600800000
[3428:internal-dpl-ccdb-backend]: [13:52:31][ERROR] Exception while running: Fatal error. Rethrowing.
[3428:internal-dpl-ccdb-backend]: [13:52:31][FATAL] Unhandled o2::framework::runtime_error reached the top of main of o2-sim-digitizer-workflow, device shutting down. Reason: Fatal error
[ERROR] Workflow crashed - PID 3428 (internal-dpl-ccdb-backend) did not exit correctly however it's not clear why. Exit code forced to 128.
[ERROR]  - Device internal-dpl-ccdb-backend: pid 3428 (exit 128)
[INFO]    - First error: [13:52:28][FATAL] Unable to find CCDB object CTP/Calib/OrbitReset/1550600800000
[ERROR] SEVERE: Device internal-dpl-ccdb-backend (3428) had at least one message above severity 7: Unable to find CCDB object CTP/Calib/OrbitReset/1550600800000


## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
grep: error-log.txt: binary file matches
++ GRERR=1
++ [[ 1 == 0 ]]
++ mkdir -p /sw/INSTALLROOT/6fd142f4bdaeff4be273b40f055e9850b5207227/slc9_x86-64/o2checkcode/1.0-local201/etc/modulefiles
++ alibuild-generate-module
+ HAS_BIN=
+ HAS_LIB=
+ HAS_CMAKE=
+ HAS_ROOT=
+ '[' 0 '!=' 0 ']'
+ cat
+ printf 'if ![ is-loaded '\''BASE/1.0'\'' ] {\n module load BASE/1.0\n}'
+ echo 'BUILD_REQUIRES=CMake alibuild-recipe-tools defaults-release'
BUILD_REQUIRES=CMake alibuild-recipe-tools defaults-release
+ FULL_BUILD_REQUIRES='Alice-GRID-Utils googlebenchmark FairCMakeModules Python-modules-list MPFR safe_int CMake ninja UUID alibuild-recipe-tools O2-customization defaults-release json-c ninja-fortran date pytorch_cpuinfo bz2 double-conversion'
+ echo 'FULL_BUILD_REQUIRES=Alice-GRID-Utils googlebenchmark FairCMakeModules Python-modules-list MPFR safe_int CMake ninja UUID alibuild-recipe-tools O2-customization defaults-release json-c ninja-fortran date pytorch_cpuinfo bz2 double-conversion'
FULL_BUILD_REQUIRES=Alice-GRID-Utils googlebenchmark FairCMakeModules Python-modules-list MPFR safe_int CMake ninja UUID alibuild-recipe-tools O2-customization defaults-release json-c ninja-fortran date pytorch_cpuinfo bz2 double-conversion
++ env
++ cut -f1 -d=
++ grep -v '^DEFAULT_'
++ grep -v PKGREVISION
++ grep REVISION
++ grep -v ALIBUILD_RECIPE_TOOLS
++ sed -e s/_REVISION//
+ for x in $(env | cut -f1 -d= | grep -v "^DEFAULT_" | grep -v PKGREVISION | grep -v ALIBUILD_RECIPE_TOOLS | grep REVISION | sed -e 's/_REVISION//')
++ eval 'echo $LIBFFI_REVISION'
+++ echo 10
+ REVISION_VALUE=10
++ eval 'echo $LIBFFI_VERSION'
[0 more errors; see full log]

Full log here.