[chuck-dev] weird crash

Philipp Kroos philipp.kroos at gmail.com
Sun Nov 24 03:41:57 EST 2013 

Oh, somehow your reply got lost in my mailbox... Ok, thought something
like that. Thanks. What interesting would be any code if it would not
have some difficult to handle bugs ;)

On Tue, Nov 19, 2013 at 10:54 PM, Spencer Salazar
<spencer at ccrma.stanford.edu> wrote:
> Thanks Philipp- the issue here is that chuck doesn't cleanly handle the
> situation where a function is declared to return something, but no return
> statement is ever actually executed in the function definition. Calling such
> a function more than a few times is almost guaranteed to cause a crash,
> though it depends on the code around the function call too.
>
> This is actually a somewhat difficult bug to solve -- we've known about it
> for a while, but haven't come up with a good fix yet.
>
> spencer
>
>
> On Sun, Nov 17, 2013 at 8:05 PM, Philipp Kroos <philipp.kroos at gmail.com>
> wrote:
>>
>> Hi guys,
>>
>> I can reliably crash the VM with the following file if I uncomment the
>> crashes()-function call.
>> Sorry for the formatting. The really most weird thing is that the
>> crash is 'triggered' only if I loop more then 4 times...
>> Following the file you'll find the output of uname -a and chuck
>> --version, and the backtrace.
>> I wasn't sure if I should post here or on the users list, but since
>> I'm a programmer I decided for this list. So let me
>> know if you have any ideas that I could try out.
>>
>> Cheers, Philipp
>>
>>
>>
>> /* chuck file start */
>> fun int dontCallMe () {
>> }
>>
>> fun int iamOk () {
>> return 0;
>> }
>>
>> fun void crashes () {
>> for (0 => int j; j < 5; j++) {
>> dontCallMe ();
>> 1::ms => now;
>> }
>> }
>>
>> fun void crashesNot () {
>> for (0 => int j; j < 5; j++) {
>> iamOk ();
>> 1::ms => now;
>> }
>> }
>>
>> fun void thisNeither () {
>> for (0 => int j; j < 4; j++) {
>> dontCallMe ();
>> 1::ms => now;
>> }
>> }
>>
>>
>> //crashes ();
>> crashesNot ();
>> thisNeither ();
>>
>> /* chuck file end */
>>
>>
>> chuck --version:
>> chuck version: 1.3.2.0 (chimera)
>>    linux (jack) : 32-bit
>>    http://chuck.cs.princeton.edu/
>>    http://chuck.stanford.edu/
>>
>>
>> uname -a:
>> Linux vostro 3.11.6-1-ARCH #1 SMP PREEMPT Sat Oct 19 00:29:46 CEST
>> 2013 i686 GNU/Linux
>>
>>
>>
>> *** Error in `chuck': double free or corruption (!prev): 0x085399f0 ***
>> ======= Backtrace: =========
>> /usr/lib/libc.so.6(+0x6d6b3)[0xb72946b3]
>> /usr/lib/libc.so.6(+0x7381a)[0xb729a81a]
>> /usr/lib/libc.so.6(+0x7445c)[0xb729b45c]
>> /usr/lib/libstdc++.so.6(_ZdlPv+0x1f)[0xb7515a0f]
>> /usr/lib/libstdc++.so.6(_ZdaPv+0x1b)[0xb7515a5b]
>> chuck[0x805d572]
>> chuck[0x805d759]
>> chuck[0x805d930]
>> chuck[0x805b82f]
>> chuck[0x805ba08]
>> chuck[0x805bab0]
>> chuck[0x805085d]
>> /usr/lib/libc.so.6(__libc_start_main+0xf3)[0xb72409d3]
>> chuck[0x8052b69]
>> ======= Memory map: ========
>> 08048000-081bc000 r-xp 00000000 08:09 3151140
>> /home/philipp/Audio/Chuck/ChuckSource/chuck-1.3.2.0/src/chuck
>> 081bc000-081e3000 rw-p 00173000 08:09 3151140
>> /home/philipp/Audio/Chuck/ChuckSource/chuck-1.3.2.0/src/chuck
>> 081e3000-08226000 rw-p 00000000 00:00 0
>> 083cb000-0855a000 rw-p 00000000 00:00 0          [heap]
>> b0b00000-b0b21000 rw-p 00000000 00:00 0
>> b0b21000-b0c00000 ---p 00000000 00:00 0
>> b0d00000-b0d21000 rw-p 00000000 00:00 0
>> b0d21000-b0e00000 ---p 00000000 00:00 0
>> b0e87000-b0e88000 ---p 00000000 00:00 0
>> b0e88000-b1688000 rw-p 00000000 00:00 0          [stack:9315]
>> b1688000-b1689000 ---p 00000000 00:00 0
>> b1689000-b1e89000 rw-p 00000000 00:00 0
>> b6d00000-b6d21000 rw-p 00000000 00:00 0
>> b6d21000-b6e00000 ---p 00000000 00:00 0
>> b6e68000-b6e69000 ---p 00000000 00:00 0
>> b6e69000-b6ee9000 rw-p 00000000 00:00 0
>> b6ee9000-b6eea000 ---p 00000000 00:00 0
>> b6eea000-b6f6a000 rw-p 00000000 00:00 0
>> b6f6a000-b6f6b000 ---p 00000000 00:00 0
>> b6f6b000-b6fef000 rw-p 00000000 00:00 0
>> b6fef000-b6ff5000 r-xp 00000000 08:05 161673     /usr/lib/libogg.so.0.8.1
>> b6ff5000-b6ff6000 r--p 00005000 08:05 161673     /usr/lib/libogg.so.0.8.1
>> b6ff6000-b6ff7000 rw-p 00006000 08:05 161673     /usr/lib/libogg.so.0.8.1
>> b6ff7000-b7021000 r-xp 00000000 08:05 152013
>> /usr/lib/libvorbis.so.0.4.6
>> b7021000-b7022000 r--p 00029000 08:05 152013
>> /usr/lib/libvorbis.so.0.4.6
>> b7022000-b7023000 rw-p 0002a000 08:05 152013
>> /usr/lib/libvorbis.so.0.4.6
>> b7023000-b7189000 r-xp 00000000 08:05 152016
>> /usr/lib/libvorbisenc.so.2.0.9
>> b7189000-b719a000 r--p 00165000 08:05 152016
>> /usr/lib/libvorbisenc.so.2.0.9
>> b719a000-b719b000 rw-p 00176000 08:05 152016
>> /usr/lib/libvorbisenc.so.2.0.9
>> b719b000-b71cf000 r-xp 00000000 08:05 151995     /usr/lib/libFLAC.so.8.3.0
>> b71cf000-b71d0000 r--p 00034000 08:05 151995     /usr/lib/libFLAC.so.8.3.0
>> b71d0000-b71d1000 rw-p 00035000 08:05 151995     /usr/lib/libFLAC.so.8.3.0
>> b71d1000-b721b000 r-xp 00000000 08:05 139847
>> /usr/lib/libdbus-1.so.3.7.5
>> b721b000-b721c000 r--p 00049000 08:05 139847
>> /usr/lib/libdbus-1.so.3.7.5
>> b721c000-b721d000 rw-p 0004a000 08:05 139847
>> /usr/lib/libdbus-1.so.3.7.5
>> b721d000-b721e000 rw-p 00000000 00:00 0
>> b721e000-b7225000 r-xp 00000000 08:05 133596     /usr/lib/librt-2.18.so
>> b7225000-b7226000 r--p 00006000 08:05 133596     /usr/lib/librt-2.18.so
>> b7226000-b7227000 rw-p 00007000 08:05 133596     /usr/lib/librt-2.18.so
>> b7227000-b73d0000 r-xp 00000000 08:05 132898     /usr/lib/libc-2.18.so
>> b73d0000-b73d1000 ---p 001a9000 08:05 132898     /usr/lib/libc-2.18.so
>> b73d1000-b73d3000 r--p 001a9000 08:05 132898     /usr/lib/libc-2.18.so
>> b73d3000-b73d4000 rw-p 001ab000 08:05 132898     /usr/lib/libc-2.18.so
>> b73d4000-b73d7000 rw-p 00000000 00:00 0
>> b73d7000-b73f2000 r-xp 00000000 08:05 133144     /usr/lib/libgcc_s.so.1
>> b73f2000-b73f3000 rw-p 0001a000 08:05 133144     /usr/lib/libgcc_s.so.1
>> b73f3000-b7437000 r-xp 00000000 08:05 132897     /usr/lib/libm-2.18.so
>> b7437000-b7438000 r--p 00043000 08:05 132897     /usr/lib/libm-2.18.so
>> b7438000-b7439000 rw-p 00044000 08:05 132897     /usr/lib/libm-2.18.so
>> b7439000-b7451000 r-xp 00000000 08:05 132847
>> /usr/lib/libpthread-2.18.so
>> b7451000-b7452000 r--p 00017000 08:05 132847
>> /usr/lib/libpthread-2.18.so
>> b7452000-b7453000 rw-p 00018000 08:05 132847
>> /usr/lib/libpthread-2.18.so
>> b7453000-b7456000 rw-p 00000000 00:00 0
>> b7456000-b74c1000 r-xp 00000000 08:05 152046
>> /usr/lib/libsndfile.so.1.0.25
>> b74c1000-b74c3000 r--p 0006a000 08:05 152046
>> /usr/lib/libsndfile.so.1.0.25
>> b74c3000-b74c4000 rw-p 0006c000 08:05 152046
>> /usr/lib/libsndfile.so.1.0.25
>> b74c4000-b74c8000 rw-p 00000000 00:00 0
>> b74c8000-b74cb000 r-xp 00000000 08:05 133597     /usr/lib/libdl-2.18.so
>> b74cb000-b74cc000 r--p 00002000 08:05 133597     /usr/lib/libdl-2.18.so
>> b74cc000-b74cd000 rw-p 00003000 08:05 133597     /usr/lib/libdl-2.18.so
>> b74cd000-b75aa000 r-xp 00000000 08:05 133135
>> /usr/lib/libstdc++.so.6.0.18
>> b75aa000-b75ae000 r--p 000dc000 08:05 133135
>> /usr/lib/libstdc++.so.6.0.18
>> b75ae000-b75af000 rw-p 000e0000 08:05 133135
>> /usr/lib/libstdc++.so.6.0.18
>> b75af000-b75b6000 rw-p 00000000 00:00 0
>> b75b6000-b75fa000 r-xp 00000000 08:05 172795     /usr/lib/libjack.so.0.1.0
>> b75fa000-b75fc000 r--p 00043000 08:05 172795     /usr/lib/libjack.so.0.1.0
>> b75fc000-b75fd000 rw-p 00045000 08:05 172795     /usr/lib/libjack.so.0.1.0
>> b75fd000-b76f1000 r-xp 00000000 08:05 139859
>> /usr/lib/libasound.so.2.0.0
>> b76f1000-b76f5000 r--p 000f3000 08:05 139859
>> /usr/lib/libasound.so.2.0.0
>> b76f5000-b76f6000 rw-p 000f7000 08:05 139859
>> /usr/lib/libasound.so.2.0.0
>> b770d000-b771f000 rw-s 00000000 00:10 17126
>> /dev/shm/jack-shm-registry
>> b7721000-b7723000 rw-p 00000000 00:00 0
>> b7723000-b7724000 r-xp 00000000 00:00 0          [vdso]
>> b7724000-b7744000 r-xp 00000000 08:05 132873     /usr/lib/ld-2.18.so
>> b7744000-b7745000 r--p 0001f000 08:05 132873     /usr/lib/ld-2.18.so
>> b7745000-b7746000 rw-p 00020000 08:05 132873     /usr/lib/ld-2.18.so
>> bfcd6000-bfcf7000 rw-p 00000000 00:00 0          [stack]
>> zsh: abort (core dumped)  chuck debug.ck
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>
>
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