Segfault on bleeding edge linux build

[FreakTheMighty]

It seems the latest linux build is segfaulting on any FBX.

I'm running in docker using FROM ubuntu:16.04 to match your azure pipeline and the result is:

root@46c4f6423ab8:/app# ./bin/FBX2glTF -i src/piper_pa18.fbx -o /tmp/ --verbose
Defaulting to --pbr-metallic-roughness material support.
terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc
Aborted

[FreakTheMighty]

Just to make sure we're on the same page, here is a super simple FBX cube exported from Maya. Also, running multiple times gives different outputs.

cube.fbx.zip

root@e9f8c54e15d2:/data# FBX2glTF -i cube.fbx -o cube.gltf
*** Error in `FBX2glTF': free(): invalid pointer: 0x0000000002b6b488 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f0654b497e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7f0654b5237a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f0654b5653c]
FBX2glTF[0x40f771]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f0654af2830]
FBX2glTF[0x41ebd9]
======= Memory map: ========
00400000-00b9d000 r-xp 00000000 08:01 2447614                            /usr/bin/FBX2glTF
00d9c000-00db6000 r--p 0079c000 08:01 2447614                            /usr/bin/FBX2glTF
00db6000-00db9000 rw-p 007b6000 08:01 2447614                            /usr/bin/FBX2glTF
00db9000-00dc2000 rw-p 00000000 00:00 0 
02b4e000-02b80000 rw-p 00000000 00:00 0                                  [heap]
7f064c000000-7f064c021000 rw-p 00000000 00:00 0 
7f064c021000-7f0650000000 ---p 00000000 00:00 0 
7f0652a65000-7f065431b000 r-xp 00000000 08:01 2371831                    /usr/lib/x86_64-linux-gnu/libicudata.so.55.1
7f065431b000-7f065451a000 ---p 018b6000 08:01 2371831                    /usr/lib/x86_64-linux-gnu/libicudata.so.55.1
7f065451a000-7f065451b000 r--p 018b5000 08:01 2371831                    /usr/lib/x86_64-linux-gnu/libicudata.so.55.1
7f065451b000-7f065451c000 rw-p 018b6000 08:01 2371831                    /usr/lib/x86_64-linux-gnu/libicudata.so.55.1
7f065451c000-7f065453d000 r-xp 00000000 08:01 684679                     /lib/x86_64-linux-gnu/liblzma.so.5.0.0
7f065453d000-7f065473c000 ---p 00021000 08:01 684679                     /lib/x86_64-linux-gnu/liblzma.so.5.0.0
7f065473c000-7f065473d000 r--p 00020000 08:01 684679                     /lib/x86_64-linux-gnu/liblzma.so.5.0.0
7f065473d000-7f065473e000 rw-p 00021000 08:01 684679                     /lib/x86_64-linux-gnu/liblzma.so.5.0.0
7f065473e000-7f06548bd000 r-xp 00000000 08:01 2372044                    /usr/lib/x86_64-linux-gnu/libicuuc.so.55.1
7f06548bd000-7f0654abd000 ---p 0017f000 08:01 2372044                    /usr/lib/x86_64-linux-gnu/libicuuc.so.55.1
7f0654abd000-7f0654acd000 r--p 0017f000 08:01 2372044                    /usr/lib/x86_64-linux-gnu/libicuuc.so.55.1
7f0654acd000-7f0654ace000 rw-p 0018f000 08:01 2372044                    /usr/lib/x86_64-linux-gnu/libicuuc.so.55.1
7f0654ace000-7f0654ad2000 rw-p 00000000 00:00 0 
7f0654ad2000-7f0654c92000 r-xp 00000000 08:01 684648                     /lib/x86_64-linux-gnu/libc-2.23.so
7f0654c92000-7f0654e92000 ---p 001c0000 08:01 684648                     /lib/x86_64-linux-gnu/libc-2.23.so
7f0654e92000-7f0654e96000 r--p 001c0000 08:01 684648                     /lib/x86_64-linux-gnu/libc-2.23.so
7f0654e96000-7f0654e98000 rw-p 001c4000 08:01 684648                     /lib/x86_64-linux-gnu/libc-2.23.so
7f0654e98000-7f0654e9c000 rw-p 00000000 00:00 0 
7f0654e9c000-7f0654eb2000 r-xp 00000000 08:01 684669                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f0654eb2000-7f06550b1000 ---p 00016000 08:01 684669                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f06550b1000-7f06550b2000 rw-p 00015000 08:01 684669                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f06550b2000-7f06551ba000 r-xp 00000000 08:01 684680                     /lib/x86_64-linux-gnu/libm-2.23.so
7f06551ba000-7f06553b9000 ---p 00108000 08:01 684680                     /lib/x86_64-linux-gnu/libm-2.23.so
7f06553b9000-7f06553ba000 r--p 00107000 08:01 684680                     /lib/x86_64-linux-gnu/libm-2.23.so
7f06553ba000-7f06553bb000 rw-p 00108000 08:01 684680                     /lib/x86_64-linux-gnu/libm-2.23.so
7f06553bb000-7f065552d000 r-xp 00000000 08:01 685558                     /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f065552d000-7f065572d000 ---p 00172000 08:01 685558                     /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f065572d000-7f0655737000 r--p 00172000 08:01 685558                     /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f0655737000-7f0655739000 rw-p 0017c000 08:01 685558                     /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
7f0655739000-7f065573d000 rw-p 00000000 00:00 0 
7f065573d000-7f0655756000 r-xp 00000000 08:01 684747                     /lib/x86_64-linux-gnu/libz.so.1.2.8
7f0655756000-7f0655955000 ---p 00019000 08:01 684747                     /lib/x86_64-linux-gnu/libz.so.1.2.8
7f0655955000-7f0655956000 r--p 00018000 08:01 684747                     /lib/x86_64-linux-gnu/libz.so.1.2.8
7f0655956000-7f0655957000 rw-p 00019000 08:01 684747                     /lib/x86_64-linux-gnu/libz.so.1.2.8
7f0655957000-7f0655b08000 r-xp 00000000 08:01 2372228                    /usr/lib/x86_64-linux-gnu/libxml2.so.2.9.3
7f0655b08000-7f0655d07000 ---p 001b1000 08:01 2372228                    /usr/lib/x86_64-linux-gnu/libxml2.so.2.9.3
7f0655d07000-7f0655d0f000 r--p 001b0000 08:01 2372228                    /usr/lib/x86_64-linux-gnu/libxml2.so.2.9.3
7f0655d0f000-7f0655d11000 rw-p 001b8000 08:01 2372228                    /usr/lib/x86_64-linux-gnu/libxml2.so.2.9.3
7f0655d11000-7f0655d12000 rw-p 00000000 00:00 0 
7f0655d12000-7f0655d2a000 r-xp 00000000 08:01 684716                     /lib/x86_64-linux-gnu/libpthread-2.23.so
7f0655d2a000-7f0655f29000 ---p 00018000 08:01 684716                     /lib/x86_64-linux-gnu/libpthread-2.23.so
7f0655f29000-7f0655f2a000 r--p 00017000 08:01 684716                     /lib/x86_64-linux-gnu/libpthread-2.23.so
7f0655f2a000-7f0655f2b000 rw-p 00018000 08:01 684716                     /lib/x86_64-linux-gnu/libpthread-2.23.so
7f0655f2b000-7f0655f2f000 rw-p 00000000 00:00 0 
7f0655f2f000-7f0655f32000 r-xp 00000000 08:01 684661                     /lib/x86_64-linux-gnu/libdl-2.23.so
7f0655f32000-7f0656131000 ---p 00003000 08:01 684661                     /lib/x86_64-linux-gnu/libdl-2.23.so
7f0656131000-7f0656132000 r--p 00002000 08:01 684661                     /lib/x86_64-linux-gnu/libdl-2.23.so
7f0656132000-7f0656133000 rw-p 00003000 08:01 684661                     /lib/x86_64-linux-gnu/libdl-2.23.so
7f0656133000-7f0656159000 r-xp 00000000 08:01 684628                     /lib/x86_64-linux-gnu/ld-2.23.so
7f065634a000-7f0656353000 rw-p 00000000 00:00 0 
7f0656357000-7f0656358000 rw-p 00000000 00:00 0 
7f0656358000-7f0656359000 r--p 00025000 08:01 684628                     /lib/x86_64-linux-gnu/ld-2.23.so
7f0656359000-7f065635a000 rw-p 00026000 08:01 684628                     /lib/x86_64-linux-gnu/ld-2.23.so
7f065635a000-7f065635b000 rw-p 00000000 00:00 0 
7ffc6d5ee000-7ffc6d60f000 rw-p 00000000 00:00 0                          [stack]
7ffc6d7e7000-7ffc6d7e9000 r--p 00000000 00:00 0                          [vvar]
7ffc6d7e9000-7ffc6d7eb000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
Aborted

[zellski]

Yikes. I’ll investigate as soon as I can. There hasn’t been much time lately; I’m the only maintainer and this is a hobby project. I saw your PR — looking forward to eyeballing that too.

[FreakTheMighty]

FWIW things are working at 4bb4bdb, so I think this (7dd8438) was the breaking commit.

[zellski]

Drive-by test under Windows (happened to be booted) shows no memory issues, so I guess it might be OS dependent.

[zellski]

Hmm... absolutely can't cause this error to happen on any of my regular build environments. I guess it must be related to an old glibc or some similar system level difference? I'll try building & debugging in the Docker environment.

[zellski]

Fixed in ed43cac.