thread apply all bt

(gdb) thread apply all bt

Thread 14 (Thread 0x7f89f7067700 (LWP 23443)):
£0  0x00007f89ff922d5c in LZWDecode ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£1  0x00007f89ff90bffd in TIFFReadEncodedStrip ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£2  0x00007f89f9534165 in GTiffDataset::LoadBlockBuf(int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£3  0x00007f89f9536586 in GTiffRasterBand::IReadBlock(int, int, void*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£4  0x00007f89f95c51b5 in GDALRasterBand::GetLockedBlockRef(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£5  0x00007f89f95de862 in GDALRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£6  0x00007f89f9530a92 in GTiffRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£7  0x00007f89f9520d8e in gdal_featureset::get_feature(mapnik::query const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£8  0x00007f89f952151e in gdal_featureset::next() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£9  0x00007f89ff40c111 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_style(mapnik::agg_renderer<mapnik::image_32>&, mapnik::feature_type_style const*, mapnik::rule_cache const&, boost::shared_ptr<mapnik::Featureset>, mapnik::proj_transform const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£10 0x00007f89ff40d7b7 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_material(mapnik::layer_rendering_material&, mapnik::agg_renderer<mapnik::image_32>&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£11 0x00007f89ff40e269 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::apply(double) () from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£12 0x00007f8a04fe1233 in Map::EIO_RenderImage(uv_work_s*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik.node
£13 0x0000000000961c4d in ?? ()
£14 0x0000000000957449 in ?? ()
£15 0x00007f8a05640182 in start_thread (arg=0x7f89f7067700) at pthread_create.c:312
£16 0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 13 (Thread 0x7f89f5864700 (LWP 23446)):
£0  0x00007f89ff922e01 in LZWDecode ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£1  0x00007f89ff90bffd in TIFFReadEncodedStrip ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£2  0x00007f89f9534165 in GTiffDataset::LoadBlockBuf(int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£3  0x00007f89f9536586 in GTiffRasterBand::IReadBlock(int, int, void*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
---Type <return> to continue, or q <return> to quit---
£4  0x00007f89f95c51b5 in GDALRasterBand::GetLockedBlockRef(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£5  0x00007f89f95de862 in GDALRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£6  0x00007f89f9530a92 in GTiffRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£7  0x00007f89f9520de3 in gdal_featureset::get_feature(mapnik::query const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£8  0x00007f89f952151e in gdal_featureset::next() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£9  0x00007f89ff40c111 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_style(mapnik::agg_renderer<mapnik::image_32>&, mapnik::feature_type_style const*, mapnik::rule_cache const&, boost::shared_ptr<mapnik::Featureset>, mapnik::proj_transform const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£10 0x00007f89ff40d7b7 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_material(mapnik::layer_rendering_material&, mapnik::agg_renderer<mapnik::image_32>&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£11 0x00007f89ff40e269 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::apply(double) () from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£12 0x00007f8a04fe1233 in Map::EIO_RenderImage(uv_work_s*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik.node
£13 0x0000000000961c4d in ?? ()
£14 0x0000000000957449 in ?? ()
£15 0x00007f8a05640182 in start_thread (arg=0x7f89f5864700) at pthread_create.c:312
£16 0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 12 (Thread 0x7f89f7868700 (LWP 23442)):
£0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
£1  0x0000000000961a39 in uv_cond_wait ()
£2  0x0000000000961bff in ?? ()
£3  0x0000000000957449 in ?? ()
£4  0x00007f8a05640182 in start_thread (arg=0x7f89f7868700) at pthread_create.c:312
£5  0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 11 (Thread 0x7f8a06693780 (LWP 23438)):
£0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
£1  0x000000000096662a in uv.epoll_wait ()
£2  0x0000000000964d23 in uv.io_poll ()
£3  0x0000000000958b7c in uv_run ()
£4  0x0000000000813fdf in node::Start(int, char**) ()
£5  0x00007f8a05293ec5 in __libc_start_main (main=0x58be70 <main>, argc=9, argv=0x7fff55a4dc48, 
    init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff55a4dc38)
    at libc-start.c:287
£6  0x000000000058c150 in _start ()
---Type <return> to continue, or q <return> to quit---

Thread 10 (Thread 0x7f8a06691700 (LWP 23439)):
£0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
£1  0x0000000000807ac5 in v8::internal::LinuxSemaphore::Wait() ()
£2  0x0000000000729cbb in v8::internal::RuntimeProfiler::WaitForSomeIsolateToEnterJS() ()
£3  0x0000000000808f32 in v8::internal::SignalSender::Run() ()
£4  0x0000000000807aa7 in ?? ()
£5  0x00007f8a05640182 in start_thread (arg=0x7f8a06691700) at pthread_create.c:312
£6  0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 9 (Thread 0x7f89f6866700 (LWP 23444)):
£0  0x00007f89ff922d61 in LZWDecode ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£1  0x00007f89ff90bffd in TIFFReadEncodedStrip ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£2  0x00007f89f9534165 in GTiffDataset::LoadBlockBuf(int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£3  0x00007f89f9536586 in GTiffRasterBand::IReadBlock(int, int, void*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£4  0x00007f89f95c51b5 in GDALRasterBand::GetLockedBlockRef(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£5  0x00007f89f95de862 in GDALRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£6  0x00007f89f9530a92 in GTiffRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£7  0x00007f89f9520d8e in gdal_featureset::get_feature(mapnik::query const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£8  0x00007f89f952151e in gdal_featureset::next() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£9  0x00007f89ff40c111 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_style(mapnik::agg_renderer<mapnik::image_32>&, mapnik::feature_type_style const*, mapnik::rule_cache const&, boost::shared_ptr<mapnik::Featureset>, mapnik::proj_transform const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£10 0x00007f89ff40d7b7 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_material(mapnik::layer_rendering_material&, mapnik::agg_renderer<mapnik::image_32>&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£11 0x00007f89ff40e269 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::apply(double) () from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£12 0x00007f8a04fe1233 in Map::EIO_RenderImage(uv_work_s*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik.node
£13 0x0000000000961c4d in ?? ()
£14 0x0000000000957449 in ?? ()
£15 0x00007f8a05640182 in start_thread (arg=0x7f89f6866700) at pthread_create.c:312
£16 0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

---Type <return> to continue, or q <return> to quit---
Thread 8 (Thread 0x7f89f4862700 (LWP 23448)):
£0  0x00007f89ff922d4c in LZWDecode ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£1  0x00007f89ff90bffd in TIFFReadEncodedStrip ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£2  0x00007f89f9534165 in GTiffDataset::LoadBlockBuf(int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£3  0x00007f89f9536586 in GTiffRasterBand::IReadBlock(int, int, void*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£4  0x00007f89f95c51b5 in GDALRasterBand::GetLockedBlockRef(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£5  0x00007f89f95de862 in GDALRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£6  0x00007f89f9530a92 in GTiffRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£7  0x00007f89f9520d8e in gdal_featureset::get_feature(mapnik::query const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£8  0x00007f89f952151e in gdal_featureset::next() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£9  0x00007f89ff40c111 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_style(mapnik::agg_renderer<mapnik::image_32>&, mapnik::feature_type_style const*, mapnik::rule_cache const&, boost::shared_ptr<mapnik::Featureset>, mapnik::proj_transform const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£10 0x00007f89ff40d7b7 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_material(mapnik::layer_rendering_material&, mapnik::agg_renderer<mapnik::image_32>&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£11 0x00007f89ff40e269 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::apply(double) () from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£12 0x00007f8a04fe1233 in Map::EIO_RenderImage(uv_work_s*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik.node
£13 0x0000000000961c4d in ?? ()
£14 0x0000000000957449 in ?? ()
£15 0x00007f8a05640182 in start_thread (arg=0x7f89f4862700) at pthread_create.c:312
£16 0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 7 (Thread 0x7f89f305f700 (LWP 23451)):
£0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
£1  0x0000000000961a39 in uv_cond_wait ()
£2  0x0000000000961bff in ?? ()
£3  0x0000000000957449 in ?? ()
£4  0x00007f8a05640182 in start_thread (arg=0x7f89f305f700) at pthread_create.c:312
£5  0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 6 (Thread 0x7f89f8069700 (LWP 23441)):
---Type <return> to continue, or q <return> to quit---
£0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
£1  0x0000000000961a39 in uv_cond_wait ()
£2  0x0000000000961bff in ?? ()
£3  0x0000000000957449 in ?? ()
£4  0x00007f8a05640182 in start_thread (arg=0x7f89f8069700) at pthread_create.c:312
£5  0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 5 (Thread 0x7f89f886a700 (LWP 23440)):
£0  0x00007f89ff922e23 in LZWDecode ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£1  0x00007f89ff90bffd in TIFFReadEncodedStrip ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£2  0x00007f89f9534165 in GTiffDataset::LoadBlockBuf(int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£3  0x00007f89f9536586 in GTiffRasterBand::IReadBlock(int, int, void*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£4  0x00007f89f95c51b5 in GDALRasterBand::GetLockedBlockRef(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£5  0x00007f89f95de862 in GDALRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£6  0x00007f89f9530a92 in GTiffRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£7  0x00007f89f9520d8e in gdal_featureset::get_feature(mapnik::query const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£8  0x00007f89f952151e in gdal_featureset::next() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£9  0x00007f89ff40c111 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_style(mapnik::agg_renderer<mapnik::image_32>&, mapnik::feature_type_style const*, mapnik::rule_cache const&, boost::shared_ptr<mapnik::Featureset>, mapnik::proj_transform const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£10 0x00007f89ff40d7b7 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_material(mapnik::layer_rendering_material&, mapnik::agg_renderer<mapnik::image_32>&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£11 0x00007f89ff40e269 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::apply(double) () from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£12 0x00007f8a04fe1233 in Map::EIO_RenderImage(uv_work_s*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik.node
£13 0x0000000000961c4d in ?? ()
£14 0x0000000000957449 in ?? ()
£15 0x00007f8a05640182 in start_thread (arg=0x7f89f886a700) at pthread_create.c:312
£16 0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7f89f4061700 (LWP 23449)):
£0  0x00007f89ff922df8 in LZWDecode ()
---Type <return> to continue, or q <return> to quit---
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£1  0x00007f89ff90bffd in TIFFReadEncodedStrip ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£2  0x00007f89f9534165 in GTiffDataset::LoadBlockBuf(int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£3  0x00007f89f9536586 in GTiffRasterBand::IReadBlock(int, int, void*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£4  0x00007f89f95c51b5 in GDALRasterBand::GetLockedBlockRef(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£5  0x00007f89f95de862 in GDALRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£6  0x00007f89f9530a92 in GTiffRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£7  0x00007f89f9520de3 in gdal_featureset::get_feature(mapnik::query const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£8  0x00007f89f952151e in gdal_featureset::next() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£9  0x00007f89ff40c111 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_style(mapnik::agg_renderer<mapnik::image_32>&, mapnik::feature_type_style const*, mapnik::rule_cache const&, boost::shared_ptr<mapnik::Featureset>, mapnik::proj_transform const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£10 0x00007f89ff40d7b7 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_material(mapnik::layer_rendering_material&, mapnik::agg_renderer<mapnik::image_32>&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£11 0x00007f89ff40e269 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::apply(double) () from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£12 0x00007f8a04fe1233 in Map::EIO_RenderImage(uv_work_s*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik.node
£13 0x0000000000961c4d in ?? ()
£14 0x0000000000957449 in ?? ()
£15 0x00007f8a05640182 in start_thread (arg=0x7f89f4061700) at pthread_create.c:312
£16 0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7f89f3860700 (LWP 23450)):
£0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
£1  0x0000000000961a39 in uv_cond_wait ()
£2  0x0000000000961bff in ?? ()
£3  0x0000000000957449 in ?? ()
£4  0x00007f8a05640182 in start_thread (arg=0x7f89f3860700) at pthread_create.c:312
£5  0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f89f5063700 (LWP 23447)):
£0  __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
£1  0x00007f8a052f7a0b in _L_lock_4651 () from /lib/x86_64-linux-gnu/libc.so.6
---Type <return> to continue, or q <return> to quit---
£2  0x00007f8a052f2223 in _int_free (av=0x7f89c8000020, p=0x7f89c82c4a70, have_lock=0)
    at malloc.c:3943
£3  0x00007f89f95c8cea in GDALRasterBlock::~GDALRasterBlock() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£4  0x00007f89f95c8d59 in GDALRasterBlock::~GDALRasterBlock() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£5  0x00007f89f95c4828 in GDALRasterBand::FlushBlock(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£6  0x00007f89f95c8e0a in GDALRasterBlock::FlushCacheBlock() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£7  0x00007f89f95c9078 in GDALRasterBlock::Internalize() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£8  0x00007f89f95c512d in GDALRasterBand::GetLockedBlockRef(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£9  0x00007f89f9530d64 in GTiffRasterBand::FillCacheForOtherBands(int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£10 0x00007f89f95c51b5 in GDALRasterBand::GetLockedBlockRef(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£11 0x00007f89f95de862 in GDALRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£12 0x00007f89f9530a92 in GTiffRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£13 0x00007f89f9520de3 in gdal_featureset::get_feature(mapnik::query const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£14 0x00007f89f952151e in gdal_featureset::next() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£15 0x00007f89ff40c111 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_style(mapnik::agg_renderer<mapnik::image_32>&, mapnik::feature_type_style const*, mapnik::rule_cache const&, boost::shared_ptr<mapnik::Featureset>, mapnik::proj_transform const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£16 0x00007f89ff40d7b7 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_material(mapnik::layer_rendering_material&, mapnik::agg_renderer<mapnik::image_32>&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£17 0x00007f89ff40e269 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::apply(double) () from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£18 0x00007f8a04fe1233 in Map::EIO_RenderImage(uv_work_s*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik.node
£19 0x0000000000961c4d in ?? ()
£20 0x0000000000957449 in ?? ()
£21 0x00007f8a05640182 in start_thread (arg=0x7f89f5063700) at pthread_create.c:312
£22 0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f89f6065700 (LWP 23445)):
£0  0x00007f8a052a8f79 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
£1  0x00007f8a052ac388 in __GI_abort () at abort.c:89
---Type <return> to continue, or q <return> to quit---
£2  0x00007f8a052e61d4 in __libc_message (do_abort=do_abort@entry=1, 
    fmt=fmt@entry=0x7f8a053f4a10 "*** Error in `%s': %s: 0x%s ***\n")
    at ../sysdeps/posix/libc_fatal.c:175
£3  0x00007f8a052f0f37 in malloc_printerr (action=<optimized out>, 
    str=0x7f8a053f0ae6 "corrupted double-linked list", ptr=<optimized out>) at malloc.c:4996
£4  0x00007f8a052f25e7 in _int_free (av=0x7f89c8000020, p=<optimized out>, have_lock=0)
    at malloc.c:3996
£5  0x00007f89f95c8cea in GDALRasterBlock::~GDALRasterBlock() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£6  0x00007f89f95c8d59 in GDALRasterBlock::~GDALRasterBlock() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£7  0x00007f89f95c4828 in GDALRasterBand::FlushBlock(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£8  0x00007f89f95c8e0a in GDALRasterBlock::FlushCacheBlock() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£9  0x00007f89f95c9078 in GDALRasterBlock::Internalize() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£10 0x00007f89f95c512d in GDALRasterBand::GetLockedBlockRef(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£11 0x00007f89f9530d64 in GTiffRasterBand::FillCacheForOtherBands(int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£12 0x00007f89f95c51b5 in GDALRasterBand::GetLockedBlockRef(int, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£13 0x00007f89f95de862 in GDALRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£14 0x00007f89f9530a92 in GTiffRasterBand::IRasterIO(GDALRWFlag, int, int, int, int, void*, int, int, GDALDataType, int, int) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£15 0x00007f89f9520d8e in gdal_featureset::get_feature(mapnik::query const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£16 0x00007f89f952151e in gdal_featureset::next() ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik/input/gdal.input
£17 0x00007f89ff40c111 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_style(mapnik::agg_renderer<mapnik::image_32>&, mapnik::feature_type_style const*, mapnik::rule_cache const&, boost::shared_ptr<mapnik::Featureset>, mapnik::proj_transform const&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£18 0x00007f89ff40d7b7 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::render_material(mapnik::layer_rendering_material&, mapnik::agg_renderer<mapnik::image_32>&) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£19 0x00007f89ff40e269 in mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image_32> >::apply(double) () from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/libmapnik.so
£20 0x00007f8a04fe1233 in Map::EIO_RenderImage(uv_work_s*) ()
   from /home/ubuntu/tilemill/node_modules/mapnik/lib/binding/mapnik.node
£21 0x0000000000961c4d in ?? ()
£22 0x0000000000957449 in ?? ()
£23 0x00007f8a05640182 in start_thread (arg=0x7f89f6065700) at pthread_create.c:312
---Type <return> to continue, or q <return> to quit---
£24 0x00007f8a0536d30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
(gdb) 
(gdb)