Incomprehensible app crash on old iPod/iPhone

I have a strange app crash:

• it crashes on iPod 2G (iOS 4.2) and iPhone 3G (iOS 3.1.3) but runs well on iPhone 4, iPad and Simulator
• it crashes each time in the same line with "EXC_BAD_INSTRUCTION" (some little time after app launching)
• it crashes at calling system functions: first time at alListenerf(...), then if I comment this line it crashes at mmap(...), and after commenting it at glBindFramebufferOES(...), executing 开发者_运维技巧well my code between these functions

I profiled the app with Instruments thinking that the problem is with memory but there is enough free memory on device at the moment of crash. Earlier I met a similar crash on release build related to "level of optimization" setting (crash on "Fast" and "Faster", works on "None") but now it crashes in debug and release builds. Looks like there is a device-specific bug.

Maybe someone has solved the same problem, I should be thankful for help.

Make sure you're generating instructions for both arm6 and arm7 processors. The older phones don't understand the newer arm7 instruction set.