Failed to fetch symbols for ntdll.dll

Jerry Harmon

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Sep 30, 2019, 12:24:10 PM9/30/19

to Dr. Memory Users

I am running into an issue when I try to run Dr Memory in an Windows automated build service (Atlassian Bamboo).

If I login normally and run Dr Memory it works fine. But when I run the same Dr Memory command in a script run by a Windows service I get the following error fetching symbols (I am using the same user to login manually and run the service so the user has the same permissions):

drmemory.exe -no_use_stderr -batch -light -- <my_test_command>

WARNING: Running on an unsupported operating system version. Attempting to auto-generate system call information...

drsys_find_sysnum_libs: C:\WINDOWS\system32\ntdll.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\kernelbase.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\kernel32.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\gdi32.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\imm32.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\user32.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\win32u.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\ntdll.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\kernelbase.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\kernel32.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\gdi32.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\imm32.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\user32.dll is readable

drsys_find_sysnum_libs: C:\WINDOWS\system32\win32u.dll is readable

Symbol cache directory is "C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\DrMemoryLog\symcache"

Fetching symbols for "C:\WINDOWS\system32\ntdll.dll", attempt #0

Ignoring local _NT_SYMBOL_PATH in next attempt.

Fetching symbols for "C:\WINDOWS\system32\ntdll.dll", attempt #1

Ignoring local _NT_SYMBOL_PATH in next attempt.

Failed to fetch symbols for C:\WINDOWS\system32\ntdll.dll: error 1

~~Dr.M~~ WARNING: application exited with abnormal code 0xc000a004

Running on Windows 10 1809 build 17763.737

Is there a a diagnostic option that would give more info about why it failed to fetch symbols? I have tried --verbose and --debug and it doesnt give me any more info on the error.

Is it possible for me to fetch the symbols in a manual run and save them in a directory which I could use for later automated runs so the build service wouldnt need to fetch symbols?

Thanks. Dr Memory is awesome by the way.

Derek Bruening

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Sep 30, 2019, 1:19:52 PM9/30/19

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The fetching only happens once, so yes, you can do it just once manually. It produces a single text file syscalls_{x64,wow64,x86}.txt and stores it in the symcache/ subdirectory of the logs directory: from your output that is "C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\DrMemoryLog\symcache". You can take the syscall_*.txt file from your run as your user and copy that in there, or even from another machine with the same 1809 version: the file should be identical.

To diagnose the failure, please pass "-vvv" to drmemory.exe which should provide further information.

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Jerry Harmon

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Sep 30, 2019, 5:17:41 PM9/30/19

to Dr. Memory Users

Thank you! I was able to get things working by using -syscall_number_path and pointing at it the syscalls file I generated in my manual run.

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Derek Bruening

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Sep 30, 2019, 6:38:44 PM9/30/19

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For improving Dr. Memory, could you share additional diagnostic information from -vvv to try and understand why it originally failed?

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Jerry Harmon

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Sep 30, 2019, 7:41:59 PM9/30/19

to Dr. Memory Users

When I run with -vvv I get this output:

C:/Program Files (x86)/Dr. Memory/bin64/drmemory.exe -logdir C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\DrMemoryLog -no_use_stderr -batch -light -vvv -- C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\testApp

INFO: targeting application: "C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\testApp.exe"

INFO: app cmdline: "C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\testApp"

INFO: logdir is "C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\DrMemoryLog"

INFO: symcache_dir is "C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\DrMemoryLog\symcache"

drfront_set_client_symbol_search_path: setting C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\DrMemoryLog\symcache\symbols as the local store

drfront_set_client_symbol_search_path: returning srv*C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\DrMemoryLog\symcache\symbols*http://msdl.microsoft.com/download/symbols

drfront_set_symbol_search_path: set symbol search path to srv*C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\DrMemoryLog\symcache\symbols*http://msdl.microsoft.com/download/symbols

INFO: Setting TZ to Pacific Standard Time for i#2164 workaround

INFO: DynamoRIO configuration directory is C:\Users\svc-cdsbb-aa/dynamorio

INFO: configuring testApp.exe pid=9048 dr_ops="-disable_traces -bb_single_restore_prefix -max_bb_instrs 256 -vm_size 256M -no_enable_reset -no_vm_base_near_app -no_early_inject -msgbox_mask 0 -logdir `C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\DrMemoryLog\dynamorio` "

INFO: configuring client "C:\Program Files (x86)\Dr. Memory\bin64\debug\drmemorylib.dll" ops="`-no_use_stderr` `-light` -logdir `C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\DrMemoryLog` -symcache_dir `C:\bamboo-agent-home\xml-data\build-dir\CSM-DM1-XD\x64\Debug\DrMemoryLog\symcache` -lib_blacklist `C:\WINDOWS*.d??,C:\Program Files\Common Files\Microsoft Shared*.d??,C:\Program Files (x86)\Common Files\Microsoft Shared*.d??` -resfile 9048 "

INFO: waiting for app to exit...