Crash inside Mix_DoEffect, memory allocation (irregular, hard to reproduce)

[SDLBugzilla]

This bug report was migrated from our old Bugzilla tracker.

Reported in version: 2.0.0 Reported for operating system, platform: Windows 7, x86_64

Comments on the original bug report:

On 2015-03-09 17:46:10 +0000, Piotr Kosek wrote:

The problem is very irregular, it happens after 10-30 minutes of running of my game (longer when under debugger) and I didn't found a way to reproduce it on smaller code and in shorter amount of time. The crash seems to happen in the same place however.

Newest (2.0.3) stable SDL compiled from source to get Visual Debugging Symbols and source code trace.

Call Stack:

SDL2.dll!tmalloc_large(malloc_state * m, unsigned int nb) Line 3825 SDL2.dll!SDL_malloc_REAL(unsigned int bytes) Line 4251 SDL2.dll!SDL_malloc(unsigned int a) Line 409

SDL2_mixer.dll!Mix_DoEffects(int chan, void * snd, int len) Line 282 SDL2_mixer.dll!mix_channels(void * udata, unsigned char * stream, int len) Line 360 SDL2.dll!SDL_RunAudio(void * devicep) Line 483 SDL2.dll!SDL_RunThread(void * data) Line 282 SDL2.dll!RunThread(void * data) Line 85 SDL2.dll!RunThreadViaCreateThread(void * data) Line 94 [External Code]

Local variables in top four functions:

in SDL2.dll!tmalloc_large(malloc_state * m, unsigned int nb) Line 3825:

F 0x00ffffff {prev_foot=??? head=??? fd=??? ...} malloc_tree_chunk * K 2550136832 unsigned int T 0x06d9f178 {prev_foot=16392 head=3681 fd=0x00ffffff {prev_foot=??? head=??? fd=??? ...} ...} malloc_tree_chunk * I 7 unsigned int H SDL2.dll!0x0f8cd8a0 {0x06d9f178 {prev_foot=16392 head=3681 fd=0x00ffffff {prev_foot=??? head=??? fd=...} ...}} malloc_tree_chunk * * TP 0x06d9f178 {prev_foot=16392 head=3681 fd=0x00ffffff {prev_foot=??? head=??? fd=??? ...} ...} malloc_tree_chunk * r 0x06d9f178 {prev_foot=16392 head=3681 fd=0x00ffffff {prev_foot=??? head=??? fd=??? ...} ...} malloc_chunk * m 0x0f8cd758 {SDL2.dll!malloc_state gm} {smallmap=2223932420 treemap=191965 dvsize=728 ...} malloc_state * nb 16392 unsigned int t 0x00000000 <NULL> malloc_tree_chunk * idx 12 unsigned int rsize 3680 unsigned int v 0x06d9b170 {prev_foot=0 head=16395 fd=0x06d9b170 {prev_foot=0 head=16395 fd=0x06d9b170 {prev_foot=0 ...} ...} ...} malloc_tree_chunk *

in SDL2.dll!SDL_malloc_REAL(unsigned int bytes) Line 4251:

nb 16392 unsigned int mem 0x002cfc60 void * bytes 16384 unsigned int

in SDL2_mixer.dll!Mix_DoEffects(int chan, void * snd, int len) Line 282:

chan 0 int snd 0x7edf5f08 void * len 16384 int e 0x02d9e1d0 {callback=0x00182a30 {SDL2_mixer.dll!_Eff_position_s16lsb(int, void *, int, void *)} done_callback=...} _Mix_effectinfo * buf 0x7edf5f08 void * posteffect 0 int

in SDL2_mixer.dll!mix_channels(void * udata, unsigned char * stream, int len) Line 360:

remaining 16384 int index 0 int udata 0x00000000 void * stream 0x002c38e8 "" unsigned char * len 16384 int mixable 16384 int volume 0 int mix_input 0x00000000 <NULL> unsigned char * sdl_ticks 2699790 unsigned int i 0 int