Hello, the command has now started to work like normal after leaving it for 
a while, so my problem might not be the same as Alessandro's. 
Unfortunately, I cannot upload a bigger stack trace until tomorrow because 
of the time in my timezone. Sorry!

On Wednesday, December 20, 2017 at 9:48:34 PM UTC, Colin Cross wrote:
>
> Can you attach a longer strace with -T ?
>
> On Wed, Dec 20, 2017 at 1:28 PM, Peter Warrington <[email protected] 
> <javascript:>> wrote:
>
>> Thank you! That is very interesting. In case it helps, I benchmarked my 
>> external HDD and it has an average read rate of 92.0 MB/s and an average 
>> access time of 16.37 msec. However, I didn't have any trouble with this 
>> previously.
>>
>> On Wednesday, December 20, 2017 at 9:06:16 PM UTC, Colin Cross wrote:
>>>
>>> Nothing looks wrong in that strace, it is making forward progress.  It 
>>> needs to read every directory and stat every file in the tree, is your 
>>> filesystem very slow for some reason?
>>>
>>> One difference I see between the old implementation using the find tool 
>>> and the new implementation is that find seems to be able to avoiding 
>>> calling stat on every directory entry, because the relevant information 
>>> (whether the entry is a subdirectory or a file) is contained in the return 
>>> from the getdents64 syscall.  The Go implementation is ignoring that 
>>> information and has to call lstat to get it.
>>>
>>> On Wed, Dec 20, 2017 at 11:32 AM, Peter Warrington <[email protected]> 
>>> wrote:
>>>
>>>> Attached is a partial strace.
>>>>
>>>> On Wednesday, December 20, 2017 at 7:06:31 PM UTC, Colin Cross wrote:
>>>>>
>>>>> From the stack trace after ctrl-c, lunch will be waiting for the child 
>>>>> soong_ui process to complete.  An strace of that process would be 
>>>>> interesting.
>>>>>
>>>>> On Mon, Dec 18, 2017 at 4:12 PM, Alessandro Brucato <
>>>>> [email protected]> wrote:
>>>>>
>>>>>> This is the output of strace attached to the process in which I 
>>>>>> execute "lunch".
>>>>>>
>>>>>>
>>>>>>
>>>>>> <https://lh3.googleusercontent.com/-Rk-T1kCPUnA/WjhYORJYCKI/AAAAAAAAGSY/LIzqOc58jvkTpj7dowKqjz1OsKoAy0dZQCLcBGAs/s1600/strace.PNG>
>>>>>>
>>>>>> When "lunch" is stuck, the output of strace ends with "wait4(-1,". 
>>>>>> All the remaining part appears when I abort "lunch" with CTRL+C.
>>>>>>
>>>>>> Maybe this issue is due to the fact that I'm using a guest in 
>>>>>> Virtualbox?
>>>>>>
>>>>>> Il giorno lunedì 18 dicembre 2017 23:45:48 UTC+1, Colin Cross ha 
>>>>>> scritto:
>>>>>>>
>>>>>>> Can you capture the full output of all the stack traces?
>>>>>>>
>>>>>>> It's getting stuck while trying to walk all the checked-out code 
>>>>>>> looking for various build files.  If it was completely deadlocked then 
>>>>>>> it 
>>>>>>> would have died on its own, so it's probably stuck in a loop somehow.
>>>>>>>
>>>>>>> On Mon, Dec 18, 2017 at 8:12 AM, Alessandro Brucato <
>>>>>>> [email protected]> wrote:
>>>>>>>
>>>>>>>> Hello, I'm trying to build the Android source code for my Hikey 960 
>>>>>>>> board.
>>>>>>>> I'm following this video tutorial 
>>>>>>>> https://www.youtube.com/watch?v=RD_NZRKiZBU in parallel to the 
>>>>>>>> official Android guide 
>>>>>>>> https://source.android.com/setup/devices#hikey-boards.
>>>>>>>>
>>>>>>>>
>>>>>>>> Everything went fine until I reached the command "lunch 
>>>>>>>> hikey960-userdebug". It blocks, without returning any output. I left 
>>>>>>>> it 
>>>>>>>> "working" for 1 hour and then I aborted it (even if I know that this 
>>>>>>>> command should take few seconds). If I execute only "lunch" it shows 
>>>>>>>> the 
>>>>>>>> list of available build targets, and when I select 
>>>>>>>> "hikey960-userdebug" it 
>>>>>>>> blocks. When I abort it with CTRL+C, it says "Still alive, killing 
>>>>>>>> subprocesses" and then it shows a lot of messages referring to 
>>>>>>>> threads. 
>>>>>>>> Here is the screenshot https://ibb.co/k32KQR
>>>>>>>> I noticed that also the "make" command (inside the AOSP directory) 
>>>>>>>> has the same behaviour.
>>>>>>>>
>>>>>>>>
>>>>>>>> This is the list of commands I've used during the process:
>>>>>>>>
>>>>>>>>
>>>>>>>> sudo apt-get install openjdk-7-jdk
>>>>>>>>
>>>>>>>> sudo apt-get install git-core gnupg flex bison gperf 
>>>>>>>> build-essential zip curl zlib1g-dev gcc-multilib g++-multilib 
>>>>>>>> libc6-dev-i386 lib32ncurses5-dev x11proto-core-dev libx11-dev 
>>>>>>>> lib32z-dev 
>>>>>>>> ccache libgl1-mesa-dev libxml2-utils xsltproc unzip
>>>>>>>>
>>>>>>>> mkdir output
>>>>>>>>
>>>>>>>> export OUT_DIR_COMMON_BASE=/home/brucedh/output/
>>>>>>>>
>>>>>>>> mkdir ~/bin
>>>>>>>>
>>>>>>>> PATH=~/bin:$PATH
>>>>>>>>
>>>>>>>> curl https://storage.googleapis.com/git-repo-downloads/repo > 
>>>>>>>> ~/bin/repo
>>>>>>>>
>>>>>>>> chmod a+x ~/bin/repo
>>>>>>>>
>>>>>>>> mkdir dev
>>>>>>>>
>>>>>>>> cd dev
>>>>>>>>
>>>>>>>> mkdir hikey960
>>>>>>>>
>>>>>>>> cd hikey960
>>>>>>>>
>>>>>>>> git config --global user.name "<REDACTED>"
>>>>>>>>
>>>>>>>> git config --global user.email "<REDACTED>"
>>>>>>>>
>>>>>>>> repo init -u https://android.googlesource.com/platform/manifest -b 
>>>>>>>> master
>>>>>>>>
>>>>>>>> repo sync –j4
>>>>>>>>
>>>>>>>> git clone https://android.googlesource.com/kernel/hikey-linaro
>>>>>>>>
>>>>>>>> cd hikey-linaro
>>>>>>>>
>>>>>>>> git checkout -b android-hikey-linaro-4.9 
>>>>>>>> origin/android-hikey-linaro-4.9
>>>>>>>>
>>>>>>>> make ARCH=arm64 menuconfig
>>>>>>>>
>>>>>>>> make ARCH=arm64 hikey960_defconfig
>>>>>>>>
>>>>>>>>
>>>>>>>> PATH=/home/brucedh/dev/hikey960/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/:$PATH
>>>>>>>>
>>>>>>>> make ARCH=arm64 CROSS_COMPILE=aarch64-linux-android- -j4
>>>>>>>>
>>>>>>>> cp arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dtb 
>>>>>>>> ../device/linaro/hikey-kernel/hi3660-hikey960.dtb-4.9
>>>>>>>>
>>>>>>>> cp arch/arm64/boot/Image.gz 
>>>>>>>> ../device/linaro/hikey-kernel/Image.gz-hikey960-4.9
>>>>>>>>
>>>>>>>> cd ~/dev/hikey960
>>>>>>>>
>>>>>>>> . ./build/envsetup.sh
>>>>>>>>
>>>>>>>> lunch hikey960-userdebug
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> I'm using Ubuntu 16.04 LTS as guest on Virtualbox. I tried to do 
>>>>>>>> all the process once again from the beginning with a new virtualbox 
>>>>>>>> image, 
>>>>>>>> but I found the same problem.
>>>>>>>>
>>>>>>>> Thanks in advance! 
>>>>>>>>
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