[lug] A head scratcher for your weekend

[Louis Krupp]

On the off chance that there's something in the library that the system
doesn't like, can you do this?

readelf -e <path to library>

And would it be too much trouble to capture more of the stat calls?

And -- last -- on the off chance that something has changed, what does this
do now?:

ls -alh /usr/lib/x86_64-linux-gnu/libQt5Core.so.5*

Louis



On Mon, May 21, 2018 at 5:34 AM, Matt Bidwell <mbidwell at gmail.com> wrote:

> It appears to stat it many times. Here's the last one:
> stat("/lib/x86_64-linux-gnu", {st_mode=S_IFDIR|0755, st_size=16384, ...})
> = 0
> openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libQt5Core.so.5",
> O_RDONLY|O_CLOEXEC) = 3
> read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 at g\t\0\0\0\0\0"...,
> 832) = 832
> lseek(3, 5167904, SEEK_SET)             = 5167904
> read(3, "\4\0\0\0\20\0\0\0\1\0\0\0GNU\0\0\0\0\0\3\0\0\0\21\0\0\0\0\0\0\0",
> 32) = 32
> close(3)                                = 0
>
> Here's wht ldconfig -p get's me.
> # ldconfig -p | grep libQt5Core.so.5
>         libQt5Core.so.5 (libc6,x86-64, OS ABI: Linux 3.17.0) =>
> /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
>
> I really do appreciate the help. There were some Qt package updates this
> morning including libqt5core5a. Updating them didn't fix anything but I may
> dig through the change logs later. -Matt
>
>
> On 05/20/2018 08:30 PM, Davide Del Vento wrote:
>
>> In the strace output, is there any attempt to load any of the
>> /usr/lib/x86_64-linux-gnu/libQt5Core.so.5* ?
>> If so, you should get the clue we're after.
>> If not, that's the weirdness, especially if it shows (succeeding)
>> attempts to load /usr/lib/x86_64-linux-gnu/libQt5Script.so.5 as the
>> ldd suggests.
>>
>> On Sun, May 20, 2018 at 6:49 PM, Zan Lynx <zlynx at acm.org> wrote:
>>
>>> On 5/20/2018 4:46 PM, Matt Bidwell wrote:
>>>
>>>>
>>>> openat(AT_FDCWD, "/usr/lib/libQt5Core.so.5", O_RDONLY|O_CLOEXEC) = 3
>>>>
>>>
>>>
>>> This one is not in the 64-bit library location so it is rejected for
>>> loading
>>> into a 64-bit program. At least if it is following the usual Linux
>>> distribution file locations.
>>>
>>> --
>>>                  Knowledge is Power -- Power Corrupts
>>>                          Study Hard -- Be Evil
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