[LLVMdev] LLVM Pass Crashes

[Hassan, Ahmad]

Hi Team,

I am writing an LLVM pass that compiles fine and opt instrumentation goes fine as well. But when I run the instrumented C-program then I get the following stack dump. My question is, how can I debug the problem in this scenario please?

// LLVM pass compiles fine and the following OPT instrumentation goes fine for basic malloc.bc program as well. Malloc.bc runs fine without any instrumentation.
opt -o a.bc -load /data/ahmad/llvm3.1/Release+Asserts/lib/mypass.so  -MyPass < malloc.bc

$ lli a.bc

*** buffer overflow detected ***: lli terminated
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x37)[0x7f946b353807]
/lib/x86_64-linux-gnu/libc.so.6(+0x109700)[0x7f946b352700]
/lib/x86_64-linux-gnu/libc.so.6(+0x108b69)[0x7f946b351b69]
/lib/x86_64-linux-gnu/libc.so.6(_IO_default_xsputn+0xdd)[0x7f946b2c513d]
/lib/x86_64-linux-gnu/libc.so.6(_IO_vfprintf+0x1d42)[0x7f946b293702]
/lib/x86_64-linux-gnu/libc.so.6(__vsprintf_chk+0x94)[0x7f946b351c04]
/lib/x86_64-linux-gnu/libc.so.6(__sprintf_chk+0x7d)[0x7f946b351b4d]
/data/ahmad/llvm3.1/Release+Asserts/lib/libdatinstrument.so(initProfiler+0x23b)[0x7f946c23e70b]
[0x7f946c5db02a]
======= Memory map: ========
00400000-00f84000 r-xp 00000000 fc:00 1974479                            /usr/local/bin/lli
01183000-011d6000 r--p 00b83000 fc:00 1974479                            /usr/local/bin/lli
...
Stack dump:
0.      Program arguments: lli a.bc
Aborted (core dumped)

Thanks.
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