libmemval_simple.so crash on aarch64

[liang fang]

follow is my test command:

~/work/DynamoRIO/source/build/bin64/drrun  -c ~/work/DynamoRIO/source/build/api/bin/libmemval_simple.so  -- bash

Data file /...DynamoRIO/source/build/api/bin/memval.bash.21158.0000.log created
Segmentation fault (core dumped)

real    0m0.436s
user    0m0.318s
sys     0m0.036s

[Derek Bruening]

Did you do some standard debugging?  Get a callstack of the crash, look at the logs, etc.

As you can see the regression test for memval_simple passes though it only runs the "nzcv" simple app.  If you find corner cases not properly handled please consider contributing a better regression test.

http://139.178.82.61:8080/job/DynamoRIO-AArch64-Precommit/1577/consoleFull

171: Test command: /var/lib/jenkins/workspace/DynamoRIO-AArch64-Precommit/build/build_debug-internal-64/bin64/drrun "-s" "90" "-quiet" "-debug" "-killpg" "-stderr_mask" "0xC" "-dumpcore_mask" "0" "-code_api" "-c" "/var/lib/jenkins/workspace/DynamoRIO-AArch64-Precommit/build/build_debug-internal-64/api/samples/../bin/libmemval_simple.so" "--" "/var/lib/jenkins/workspace/DynamoRIO-AArch64-Precommit/build/build_debug-internal-64/suite/tests/bin/common.nzcv"

158/304 Test #171: code_api|sample.memval_simple ...................................   Passed    0.33 sec

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[liang fang]

i will try.  i have one question for you.  "drx_tail_pad_block(drcontext, bb);" in the memval_sample.so.  it will add label inst at the end of BB.  what's that use for? is that right in the aarch64? 

TAG  0x0000fffd2bb65b98
 +0    L3 @0x0000fffda5124f80  d5033b9f   dsb    $0x0b
 +4    L3 @0x0000fffda511cd00  d5033fdf   isb    $0x0f
 +8    m4 @0x0000fffda50b2268  00000000   <label note=0x0000000000000000>
END 0x0000fffd2bb65b98

[Nahome Bete]

from https://github.com/DynamoRIO/dynamorio/blob/master/ext/drx/drx.h#L483, 'drx_tail_pad_block' "Pads a basic block with a label at the end for routines which rely on inserting instrumentation after every instruction" For BBs that are not branch or syscall terminated, it labels them to indicate the end of the BB. 

[assad.hashm...@gmail.com]

bash doesn't work properly on AArch64 according to https://github.com/DynamoRIO/dynamorio/issues/2102

It's an old issue but might be worth trying with "-no_code_api -no_intercept_all_signals" as suggested.