Has anyone been able to run thunderbird under mochitest under valgrind？ I have been struggling to run TB under valgrind when executing mochitest to check for memory errors. (I used to this under |make mozmill| test framework, and I could fix maybe a few dozen memory errors.) Unfortunately, after switching to mochitest framework since December 2019, I have not been able to run TB under valgrind satisfactorily at all. Recent problem is that I see successful invocation of TB (I have to use a replacement binary for TB, that pretends to be thunderbird binary, but actually executes a saved TB binary under valgrind because there is an argument passing issue to |mach| when valgrind is invoked using |--valgrind| option.) after upping the number of threads under valgrind to 5000, I get timeout. Timeout *IS* expected because TB runs slowly under valgrind, but I am not sure where the timeout occurs exactly. runtests.py seems to wait for "browser" and then times out. From the log:  0:03.53 INFO Application command: /NEW-SSD/moz-obj-dir/objdir-tb3/dist/bin/thunderbird -marionette -foreground -profile /COMM-CENTRAL/TMP-DIR/tmpbShgrj.mozrunner  0:03.54 INFO runtests.py | Application pid: 6110  0:03.54 Started process `GECKO(6110)`  0:03.54 GECKO(6110) run-valgrind (masquerading as thunderbird binary)  0:03.54 GECKO(6110) final command line is:  0:03.55 GECKO(6110) valgrind --trace-children=yes --fair-sched=yes --smc-check=all-non-file --gen-suppressions=all -v --trace-signals=yes --vex-iropt-register-updates=allregs-at-mem-access --track-origins=yes --child-silent-after-fork=yes --trace-children-skip=/usr/bin/lsb_release,/usr/bin/hg,/bin/rm,*/bin/certutil,*/bin/pk12util,*/bin/ssltunnel,*/bin/uname,*/bin/which,*/bin/ps,*/bin/grep,*/bin/java,*/fix-stacks,*/firefox/firefox,*/bin/firefox-esr,*/bin/python,*/bin/python2,*/bin/python2.7,*/bin/bash --max-threads=5000  --max-stackframe=16000000 --num-transtab-sectors=24 --tool=memcheck --freelist-vol=500000000 --redzone-size=128 --px-default=allregs-at-mem-access --px-file-backed=unwindregs-at-mem-access --malloc-fill=0xA5 --free-fill=0xC3 --num-callers=50 --suppressions=/home/ishikawa/Dropbox/myown.sup --show-mismatched-frees=no --show-possibly-lost=no --read-inline-info=yes /KERNEL-SRC/moz-obj-dir/objdir-tb3/dist/bin/thunderbird-bin -marionette -foreground -profile /COMM-CENTRAL/TMP-DIR/tmpbShgrj.mozrunner  0:03.56 GECKO(6110) ==6113== Memcheck, a memory error detector  0:03.56 GECKO(6110) ==6113== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.  0:03.56 GECKO(6110) ==6113== Using Valgrind-3.16.0.GIT-c48fb614a1-20200507X and LibVEX; rerun with -h for copyright info  0:03.56 GECKO(6110) ==6113== Command: /KERNEL-SRC/moz-obj-dir/objdir-tb3/dist/bin/thunderbird-bin -marionette -foreground -profile /COMM-CENTRAL/TMP-DIR/tmpbShgrj.mozrunner  0:03.56 GECKO(6110) ==6113==  0:03.56 GECKO(6110) --6113-- Valgrind options:  0:03.56 GECKO(6110) --6113--    --trace-children=yes  0:03.56 GECKO(6110) --6113--    --fair-sched=yes  0:03.56 GECKO(6110) --6113--    --smc-check=all-non-file  0:03.56 GECKO(6110) --6113--    --gen-suppressions=all  0:03.56 GECKO(6110) --6113--    -v  0:03.56 GECKO(6110) --6113--    --trace-signals=yes  0:03.56 GECKO(6110) --6113-- --vex-iropt-register-updates=allregs-at-mem-access  0:03.56 GECKO(6110) --6113--    --track-origins=yes  0:03.56 GECKO(6110) --6113--    --child-silent-after-fork=yes  0:03.56 GECKO(6110) --6113-- --trace-children-skip=/usr/bin/lsb_release,/usr/bin/hg,/bin/rm,*/bin/certutil,*/bin/pk12util,*/bin/ssltunnel,*/bin/uname,*/bin/which,*/bin/ps,*/bin/grep,*/bin/java,*/fix-stacks,*/firefox/firefox,*/bin/firefox-esr,*/bin/python,*/bin/python2,*/bin/python2.7,*/bin/bash  0:03.56 GECKO(6110) --6113--    --max-threads=5000  0:03.56 GECKO(6110) --6113--    --max-stackframe=16000000  0:03.56 GECKO(6110) --6113--    --num-transtab-sectors=24  0:03.56 GECKO(6110) --6113--    --tool=memcheck  0:03.56 GECKO(6110) --6113--    --freelist-vol=500000000  0:03.56 GECKO(6110) --6113--    --redzone-size=128  0:03.56 GECKO(6110) --6113-- --px-default=allregs-at-mem-access  0:03.56 GECKO(6110) --6113-- --px-file-backed=unwindregs-at-mem-access  0:03.56 GECKO(6110) --6113--    --malloc-fill=0xA5  0:03.56 GECKO(6110) --6113--    --free-fill=0xC3  0:03.56 GECKO(6110) --6113--    --num-callers=50  0:03.56 GECKO(6110) --6113-- --suppressions=/home/ishikawa/Dropbox/myown.sup  0:03.56 GECKO(6110) --6113--    --show-mismatched-frees=no  0:03.56 GECKO(6110) --6113--    --show-possibly-lost=no  0:03.56 GECKO(6110) --6113--    --read-inline-info=yes  0:03.56 GECKO(6110) --6113-- Contents of /proc/version:  0:03.56 GECKO(6110) --6113--   Linux version 5.6.0-1-amd64 (debian-kernel@lists.debian.org) (gcc version 9.3.0 (Debian 9.3.0-11)) #1 SMP Debian 5.6.7-1 (2020-04-29)  0:03.56 GECKO(6110) --6113--  0:03.56 GECKO(6110) --6113-- Arch and hwcaps: AMD64, LittleEndian, amd64-cx16-lzcnt-rdtscp-sse3-ssse3-avx-avx2-rdrand  0:03.56 GECKO(6110) --6113-- Page sizes: currently 4096, max supported 4096  0:03.56 GECKO(6110) --6113-- Valgrind library directory: /usr/local/lib/valgrind The later on, I see the following line:  2:03.56 INFO runtests.py | Waiting for browser... Eventually, 20:06.17 INFO TEST-UNEXPECTED-TIMEOUT | automation.py | application timed out after 2960 seconds with no output 20:06.46 ERROR Force-terminating active process(es). 20:06.74 INFO Determining child pids from psutil... 20:11.00 INFO [6111] 20:12.27 INFO ==> process 6113 launched child process 6147 20:12.31 INFO Found child pids: set([6147, 6111]) 20:13.01 INFO Failed to get child procs 20:13.02 INFO Killing process: 6147 20:13.38 INFO Failed to retrieve MOZ_UPLOAD_DIR env var 20:13.46 INFO Can't trigger Breakpad, just killing process 20:13.56 INFO Error: Failed to kill process 6147: psutil.NoSuchProcess no process found with pid 6147 20:13.56 INFO Killing process: 6111 20:13.56 INFO Not taking screenshot here: see the one that was previously logged 20:13.56 INFO Can't trigger Breakpad, just killing process 20:44.39 INFO psutil found pid 6111 dead 20:44.39 INFO failed to kill pid 6119 after 30s 20:44.39 INFO failed to kill pid 6113 after 30s 20:44.39 INFO Killing process: 6110 20:44.39 INFO Not taking screenshot here: see the one that was previously logged 20:44.39 INFO Can't trigger Breakpad, just killing process 20:44.49 INFO psutil found pid 6110 dead 20:44.49 INFO psutil found pid 6110 dead 23:25.34 WARNING runtests.py | Failed to get app exit code - running/crashed? 23:25.40 Main app process: exit 0 23:25.52 INFO runtests.py | Application ran for: 0:23:21.973599 23:25.55 INFO zombiecheck | Reading PID log: /COMM-CENTRAL/TMP-DIR/tmpeA04Wqpidlog 23:25.85 INFO ==> process 6113 launched child process 6147 23:26.18 INFO zombiecheck | Checking for orphan process with PID: 6147 Traceback (most recent call last):   File "/NEW-SSD/moz-obj-dir/objdir-tb3/_tests/testing/mochitest/runtests.py", line 2993, in doTests     e10s=options.e10s   File "/NEW-SSD/moz-obj-dir/objdir-tb3/_tests/testing/mochitest/runtests.py", line 2456, in runApp     six.reraise(exc, value, tb)   File "/NEW-SSD/moz-obj-dir/objdir-tb3/_tests/testing/mochitest/runtests.py", line 2369, in runApp     self.marionette.start_session()   File "/NEW-SSD/NREF-COMM-CENTRAL/mozilla/testing/marionette/client/marionette_driver/decorators.py", line 36, in _     m._handle_socket_failure()   File "/NEW-SSD/NREF-COMM-CENTRAL/mozilla/testing/marionette/client/marionette_driver/marionette.py", line 654, in _handle_socket_failure     reraise(exc_cls, exc, tb)   File "/NEW-SSD/NREF-COMM-CENTRAL/mozilla/testing/marionette/client/marionette_driver/decorators.py", line 26, in _     return func(*args, **kwargs)   File "/NEW-SSD/NREF-COMM-CENTRAL/mozilla/testing/marionette/client/marionette_driver/marionette.py", line 1112, in start_session     self.raise_for_port(timeout=timeout)   File "/NEW-SSD/NREF-COMM-CENTRAL/mozilla/testing/marionette/client/marionette_driver/marionette.py", line 573, in raise_for_port     self.host, self.port)) timeout: Timed out waiting for connection on 127.0.0.1:2828! 23:42.19 ERROR Automation Error: Received unexpected exception while running application 23:42.28 INFO Stopping web server 23:44.90 INFO Stopping web socket server 23:45.82 INFO Stopping ssltunnel So nothing useful has been logged at all. (Do I need to exclude a program that is supposed to service port 2828 from running under valgrind as in "--trace-children-skip=/usr/bin/lsb_release,/usr/bin/hg,/bin/rm,*/bin/certutil,*/bin/pk12util,*/bin/ssltunnel,*/bin/uname,*/bin/which,*/bin/ps,*/bin/grep,*/bin/java,*/fix-stacks,*/firefox/firefox,*/bin/firefox-esr,*/bin/python,*/bin/python2,*/bin/python2.7,*/bin/bash" ???) With |make mozmill| after lengthening  timeout value setting, TB under valgrind ran the tests more or less successfully. Any thought or personal experience with valgrind with TB with mochitest? Chiaki