ASAN misaligned address 0x611000006a99 for type 'dods...

[ndp-opendap]

BaseType::val2buf(void *, bool) encounters alignment errors when evaluated using ASAN in the BES. For an example error message (from the BES fileout_netcdf handler) see below.

In the fileout_netcdf regression tests this is the underlying cause of 5 test failures (via ASAN):

207: bescmd/vdata_test.hdf.dmrpp.bescmd              FAILED (testsuite.at:320)
210: bescmd/vdata_packed_linked_blocks.hdf.dmrpp.bescmd FAILED (testsuite.at:323)
216: bescmd/PointFile.hdf.dmrpp.bescmd               FAILED (testsuite.at:329)
217: bescmd/vdata_test.hdf.bescmd                    FAILED (testsuite.at:333)
218: bescmd/vdata_packed_linked_blocks.hdf.bescmd    FAILED (testsuite.at:334)

Is this a design issue arising from using void * or is this a usage issue in the way that the fileout_netcdf is allocating memory?

Examine and fix if feasible.

Example ASAN error for memory alignment issue.

207. testsuite.at:320: testing bescmd/vdata_test.hdf.dmrpp.bescmd ...
COMMAND: besstandalone  -c bes.nc4.grp.conf -i bescmd/vdata_test.hdf.dmrpp.bescmd
./testsuite.at:320: besstandalone -c $abs_builddir/$bes_conf -i $input > test.nc
--- /dev/null	2024-05-28 14:43:47
+++ /Users/ndp/OPeNDAP/hyrax/bes/modules/fileout_netcdf/tests/testsuite.dir/at-groups/207/stderr	2024-05-28 14:43:47
@@ -0,0 +1,25 @@
+Float32.cc:187:13: runtime error: load of misaligned address 0x611000006a86 for type 'dods_float32' (aka 'float'), which requires 4 byte alignment
+0x611000006a86: note: pointer points here
+ 8e 3f 00 00 7b 14  8e 3f 41 61 30 3f 80 00  00 40 00 00 00 40 0e 14  7b 00 01 40 0e 14 7b 42  62 31
+             ^ 
+SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior Float32.cc:187:13 in 
+DmrppStructure.cc:154:26: runtime error: load of misaligned address 0x611000006a99 for type 'dods_uint16' (aka 'unsigned short'), which requires 2 byte alignment
+0x611000006a99: note: pointer points here
+ 7b 14 0e  40 00 01 40 0e 14 7b 42  62 31 3f 80 00 00 40 00  00 00 40 55 1e b8 00 02  40 55 1e b8 43
+              ^ 
+SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior DmrppStructure.cc:154:26 in 
+DmrppStructure.cc:154:26: runtime error: load of misaligned address 0x611000006a99 for type 'dods_uint16' (aka 'unsigned short'), which requires 2 byte alignment
+0x611000006a99: note: pointer points here
+ 7b 14 0e  40 00 01 40 0e 14 7b 42  62 31 3f 80 00 00 40 00  00 00 40 55 1e b8 00 02  40 55 1e b8 43
+              ^ 
+SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior DmrppStructure.cc:154:26 in 
+DmrppStructure.cc:154:17: runtime error: store to misaligned address 0x611000006a99 for type 'dods_uint16' (aka 'unsigned short'), which requires 2 byte alignment
+0x611000006a99: note: pointer points here
+ 7b 14 0e  40 00 01 40 0e 14 7b 42  62 31 3f 80 00 00 40 00  00 00 40 55 1e b8 00 02  40 55 1e b8 43
+              ^ 
+SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior DmrppStructure.cc:154:17 in 
+Int16.cc:180:13: runtime error: load of misaligned address 0x611000006a99 for type 'dods_int16' (aka 'short'), which requires 2 byte alignment
+0x611000006a99: note: pointer points here
+ 7b 14 0e  40 01 00 40 0e 14 7b 42  62 31 3f 80 00 00 40 00  00 00 40 55 1e b8 00 02  40 55 1e b8 43
+              ^ 
+SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior Int16.cc:180:13 in 
207. testsuite.at:320:  FAILED (testsuite.at:320)