The plot thickens. Compiling with asan on ARM gives the following for downloadertest:

Program received signal SIGSEGV, Segmentation fault.
0x00000000 in ?? ()
(gdb) bt
#0  0x00000000 in ?? ()
#1  0xb6b19344 in pthread_cond_init () from /usr/lib/arm-linux-gnueabihf/libasan.so.1
#2  0xb6a70e96 in xmlNewRMutex__internal_alias () at ../../threads.c:308
#3  0xb6aa7fd8 in __xmlInitializeDict () at ../../dict.c:179
#4  0xb6927092 in pthread_once () from /lib/arm-linux-gnueabihf/libpthread.so.0
#5  0xb6a710da in xmlIsMainThread__internal_alias () at ../../threads.c:803
#6  0xb6a70916 in __xmlGenericError__internal_alias () at ../../globals.c:865
#7  0xb6a28ce2 in xmlInitParser__internal_alias () at ../../parser.c:14728
#8  0xb6a38110 in xmlInitParser__internal_alias () at ../../parser.c:15297
#9  xmlReadMemory__internal_alias (buffer=0xb3a0175c "<album><coverart><large>http://dummy</large></coverart></album>", size=63, URL=0x0, encoding=0x0, 
    options=257) at ../../parser.c:15293
#10 0x0005ce0a in LastFMDownloader::parseXML (this=0xbeffee80, xml=...) at ../src/lastfmdownloader.cpp:44
#11 0x0005d4ba in LastFMDownloader::download (this=0xbeffee80, artist=..., album=..., fname=...) at ../src/lastfmdownloader.cpp:75
#12 0x00056140 in Downloader_canned_Test::TestBody (this=0xb44008d0) at ../tests/download.cpp:54
#13 0x0008f2b0 in testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void> (object=0xb44008d0, 
    method=&virtual testing::Test::TestBody(), location=0xa50c0 "the test body") at /usr/src/gtest/src/gtest.cc:2078
#14 0x00087bd6 in testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void> (object=0xb44008d0, 
    method=&virtual testing::Test::TestBody(), location=0xa50c0 "the test body") at /usr/src/gtest/src/gtest.cc:2114
#15 0x0006628a in testing::Test::Run (this=0xb44008d0) at /usr/src/gtest/src/gtest.cc:2151
#16 0x00066d8c in testing::TestInfo::Run (this=0xb3402b90) at /usr/src/gtest/src/gtest.cc:2326
#17 0x00067632 in testing::TestCase::Run (this=0xb4a02980) at /usr/src/gtest/src/gtest.cc:2444
#18 0x00070790 in testing::internal::UnitTestImpl::RunAllTests (this=0xb3203dc0) at /usr/src/gtest/src/gtest.cc:4315
#19 0x00091034 in testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool> (object=0xb3203dc0, 
    method=(bool (testing::internal::UnitTestImpl::*)(testing::internal::UnitTestImpl * const)) 0x70121 <testing::internal::UnitTestImpl::RunAllTests()>, 
    location=0xa74c0 "auxiliary test code (environments or event listeners)") at /usr/src/gtest/src/gtest.cc:2078
#20 0x0008969e in testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool> (object=0xb3203dc0, 
    method=(bool (testing::internal::UnitTestImpl::*)(testing::internal::UnitTestImpl * const)) 0x70121 <testing::internal::UnitTestImpl::RunAllTests()>, 
    location=0xa74c0 "auxiliary test code (environments or event listeners)") at /usr/src/gtest/src/gtest.cc:2114
#21 0x0006e70c in testing::UnitTest::Run (this=0xd1c60 <testing::UnitTest::GetInstance()::instance>) at /usr/src/gtest/src/gtest.cc:3929
#22 0x000573ec in RUN_ALL_TESTS () at /usr/include/gtest/gtest.h:2288
#23 0x00056da0 in main (argc=1, argv=0xbefff344) at ../tests/download.cpp:109