Tips for debugging statically linked DynamoRIO & drmemtrace

[Suyash Mahar]

Hi folks,

I am running into an internal error while attaching to an internal workload with statically linked DynamoRIO & drmemtrace:

<Application /data/users/appname (3186634).  Internal Error: DynamoRIO debug check failure: /mnt/srcs/dynamorio/core/unix/os.c:10307 iter->vm_start == executable_start
(Error occurred @0 frags in tid 3200078)

Unfortunately, debugging is a little bit challenges as DYNAMORIO_OPTIONS does not seem support -debug:

Option parsing error : unknown option -debug. Terminating

I already have these options enabled and am linking statically with dynamorio_static and drmemtrace_static:

    int set_env_result = setenv(
        "DYNAMORIO_OPTIONS",
        "-debug -loglevel 4 -rstats_to_stderr -client_lib ';;-offline -verbose 3'",
        1);

Are there any other recommendations on how to debug this further?

-Suyash

[Derek Bruening]

-debug is a parameter to the launcher drrun and does not mean anything to a build of the DR library: that DR library build is inherently and statically either a debug or a release build; -debug tells drrun for dynamic launches which library to pick. It looks like your statically linked DR library is a debug build as you're seeing an assert fire which only happens in debug. Does this fail in release? In some cases an assert can be more of a curiosity and is not fatal; here it couldn't find the executable, but I'm not sure it really needs it other than for some client APIs to tell a client, and maybe drmemtrace doesn't invoke those. For debugging, check how the code identifies the executable: it might be looking at maps file paths or sthg, which may not be 100% reliable with remappings: so probably your environment has remappings. If regular logging is too verbose, custom logging there may help.

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