On Wed, Aug 6, 2014 at 1:45 PM, ji wang <[email protected]> wrote:
>> (it is possible if e.g. you have
>>uninstrumented code).
> Do you mean if we want to test a single process, we must recomplied all the
> source code that the process using? In my part, an excutable using lots of
> shared lib when it runs as a single process, do we need recompiled all those
> shared lib and the excutable code？
There is no "must" here. But if the non-instrumented code has a bug
which leads to memory corruption asan will not report it
and may itself die due to that memory corruption.
>
>
>>Hard to tell more w/o reproducer.
> I can reproduce those errors using my device now at my hands, but it maybe
> diffcult for anybody else to reproduce those errors.
>
> 在 2014年8月6日星期三UTC+8下午4时52分29秒，kcc写道：
>>
>> The first one (((free_stack->size)) > ((0))" (0x0, 0x0)) looks like
>> asan could not find the stack trace where the first free() happened.
>> The second one ("((id)) != (0)" (0x0, 0x0)) is something similar --
>> asan fails to find the allocation stack trace.
>> In either case this looks like some bug in asan, or maybe a memory
>> corruption that asan has missed (it is possible if e.g. you have
>> uninstrumented code).
>> Hard to tell more w/o reproducer.
>>
>> On Wed, Aug 6, 2014 at 12:40 PM, ji wang <[email protected]> wrote:
>> > Hi, kcc
>> > Thanks,again haha:)
>> > I just simple want to know what thoes errors means, so I can correct it
>> > , as
>> > to my GCC and asan runtime lib was compiled by myself base on Gcc4.9
>> > source
>> > code maybe something went wrong.I think those not right print, may
>> > happen on
>> > muti-thread program? Or any other advices?
>> > And PS, Those occurs on my Android device, I've mentioned in other
>> > posts,Using asan enable GCC android toolchain to test libstagefright.so
>> > on
>> > my android device, push this recompiled lib and then run monkey test,
>> > got
>> > errors like above.
>> >
>> >
>> > 在 2014年8月6日星期三UTC+8下午2时15分03秒，kcc写道：
>> >>
>> >> Do you have a reproducer?
>> >>
>> >> On Wed, Aug 6, 2014 at 6:04 AM, ji wang <[email protected]> wrote:
>> >> > First: Double Free
>> >> > =================================================================
>> >> > ==2415==ERROR: AddressSanitizer: attempting double-free on 0xb4c28b20
>> >> > in
>> >> > thread T16777215:
>> >> > ==2415==AddressSanitizer CHECK failed:
>> >> > ../../../.././../gcc/gcc-4.9/libsanitizer/asan/asan_report.cc:586
>> >> > "((free_stack->size)) > ((0))" (0x0, 0x0)
>> >> > #0 0xb67af94f (/system/lib/libasan.so.1+0x3f94f)
>> >> > #1 0xb67b2f8b (/system/lib/libasan.so.1+0x42f8b)
>> >> > #2 0xb67ae137 (/system/lib/libasan.so.1+0x3e137
>> >> > ...
>> >> > ... ...
>> >> > According to the asan code, free_stack maybe should not be empty,
>> >> > should
>> >> > print something like “freed by thread T0 here:... ...previously
>> >> > allocated by
>> >> > thread T0 here:... ..."
>> >> > And of cource It's important, for what reason we may lose this
>> >> > part
>> >> > log
>> >> > print or somethine went wrong on my asan?
>> >> >
>> >> > Second: UseAfterFree
>> >> > =================================================================
>> >> > ==4782==ERROR: AddressSanitizer: heap-use-after-free on address
>> >> > 0xadb64ff7
>> >> > at pc 0xb5916e87 bp 0xb09ff8bc sp 0xb09ff8b4
>> >> > WRITE of size 1 at 0xadb64ff7 thread T16777215
>> >> > #0 0xb5916e85 (/system/lib/libstagefright.so+0x12ce85)
>> >> > #1 0xb59185b3 (/system/lib/libstagefright.so+0x12e5b3)
>> >> > ...
>> >> >
>> >> > 0xadb64ff7 is located 7 bytes inside of 8-byte region
>> >> > [0xadb64ff0,0xadb64ff8)
>> >> > ==4782==AddressSanitizer CHECK failed:
>> >> > ../../../.././../gcc/gcc-4.9/libsanitizer/asan/asan_allocator2.cc:234
>> >> > "((id)) != (0)" (0x0, 0x0)
>> >> > #0 0xb65cd94f (/system/lib/libasan.so.1+0x3f94f)
>> >> > #1 0xb65d0f8b (/system/lib/libasan.so.1+0x42f8b)
>> >> > #2 0xb65a2637 (/system/lib/libasan.so.1+0x14637)
>> >> > ...
>> >> > #6 0xb58ff04f (/system/lib/libstagefright.so+0x12c04f)
>> >> > #7 0xb59273d3 (/system/lib/libstagefright.so+0x1543d3)
>> >> > This one is the "CHECK(id);" error, what this id for? And more,
>> >> > the
>> >> > stack printed first and second which I maked red colour is the same,
>> >> > this is
>> >> > werid, why?
>> >> >
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