BuildStream-Migration-Bot opened a new issue #1404:
URL: https://github.com/apache/buildstream/issues/1404


   [See original issue on 
GitLab](https://gitlab.com/BuildStream/buildstream/-/issues/1404)
   In GitLab by [[Gitlab user 
@TheRealMichaelCatanzaro]](https://gitlab.com/TheRealMichaelCatanzaro) on Oct 
7, 2020, 18:50
   
   ## Summary
   
   ```
   $ bst build core.bst sdk.bst
   [--:--:--][][] STATUS  Cache usage recomputed: 10B / infinity (0%)
   [--:--:--][][] START   Build
   [--:--:--][][] START   Loading elements
   [00:00:04][][] SUCCESS Loading elements
   [--:--:--][][] START   Resolving elements
   [00:00:02][][] SUCCESS Resolving elements
   [--:--:--][][] START   Initializing remote caches
   ```
   
   With buildstream-1.6.0-1.fc33, bst-external-0.21.0-1.fc33, and 
python3-3.9.0~rc2-1.fc33, this last step never completes.
   
   ## Steps to reproduce
   
   Clone gnome-build-meta, then try to `bst build core.bst sdk.bst`.
   
   
   ## What is the current bug behavior?
   
   Hang before anything starts to build.
   
   
   ## What is the expected correct behavior?
   
   It should build!
   
   
   ## Relevant logs and/or screenshots
   
   [[Gitlab user @abderrahimk]](https://gitlab.com/abderrahimk) asked for some 
strace. Here is the very end before it hangs performing a read():
   
   ```
   openat(AT_FDCWD, "/dev/shm/mF8sKU", O_RDWR|O_CREAT|O_EXCL, 0600) = 5
   write(5, 
"\1\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 32) = 32
   mmap(NULL, 32, PROT_READ|PROT_WRITE, MAP_SHARED, 5, 0) = 0x7efc81be5000
   link("/dev/shm/mF8sKU", "/dev/shm/sem.mp-e3jut377") = 0
   fstat(5, {st_mode=S_IFREG|0600, st_size=32, ...}) = 0
   unlink("/dev/shm/mF8sKU")               = 0
   close(5)                                = 0
   unlink("/dev/shm/sem.mp-e3jut377")      = 0
   getpid()                                = 55091
   getpid()                                = 55091
   lstat("/dev/shm/7A80eV", 0x7ffd2832ba00) = -1 ENOENT (No such file or 
directory)
   openat(AT_FDCWD, "/dev/shm/7A80eV", O_RDWR|O_CREAT|O_EXCL, 0600) = 5
   write(5, 
"\377\377\377\177\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 
32) = 32
   mmap(NULL, 32, PROT_READ|PROT_WRITE, MAP_SHARED, 5, 0) = 0x7efc81be4000
   link("/dev/shm/7A80eV", "/dev/shm/sem.mp-7auqask5") = 0
   fstat(5, {st_mode=S_IFREG|0600, st_size=32, ...}) = 0
   unlink("/dev/shm/7A80eV")               = 0
   close(5)                                = 0
   unlink("/dev/shm/sem.mp-7auqask5")      = 0
   getpid()                                = 55091
   rt_sigprocmask(SIG_BLOCK, [INT], [], 8) = 0
   getpid()                                = 55091
   stat("/usr/lib64/python3.9/multiprocessing", {st_mode=S_IFDIR|0755, 
st_size=576, ...}) = 0
   stat("/usr/lib64/python3.9/multiprocessing/popen_fork.py", 
{st_mode=S_IFREG|0644, st_size=2377, ...}) = 0
   stat("/usr/lib64/python3.9/multiprocessing/popen_fork.py", 
{st_mode=S_IFREG|0644, st_size=2377, ...}) = 0
   openat(AT_FDCWD, 
"/usr/lib64/python3.9/multiprocessing/__pycache__/popen_fork.cpython-39.pyc", 
O_RDONLY|O_CLOEXEC) = 5
   fstat(5, {st_mode=S_IFREG|0644, st_size=2512, ...}) = 0
   ioctl(5, TCGETS, 0x7ffd2832b4a0)        = -1 ENOTTY (Inappropriate ioctl for 
device)
   lseek(5, 0, SEEK_CUR)                   = 0
   lseek(5, 0, SEEK_CUR)                   = 0
   fstat(5, {st_mode=S_IFREG|0644, st_size=2512, ...}) = 0
   read(5, 
"a\r\r\n\0\0\0\0A\202b_I\t\0\0\343\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2513) = 
2512
   read(5, "", 1)                          = 0
   close(5)                                = 0
   pipe2([5, 6], O_CLOEXEC)                = 0
   pipe2([7, 8], O_CLOEXEC)                = 0
   clone(child_stack=NULL, 
flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, 
child_tidptr=0x7efc81549a10) = 55632
   close(6)                                = 0
   close(7)                                = 0
   getpid()                                = 55091
   rt_sigprocmask(SIG_SETMASK, [], [INT], 8) = 0
   read(3,
   ```
   
   ## Possible fixes
   
   [[Gitlab user @abderrahimk]](https://gitlab.com/abderrahimk) suggests 
downgrading to python 3.8 might fix this. I'm about to try running buildstream 
in a F32 container to see.
   
   ## Other relevant information
   
   [//]: # (Add the BuildStream version. Substitute below the "x" by "1", "2" 
or the right version. Add more than one version if necessary)
   
   * BuildStream version affected: /milestone %BuildStream_v1.6
   
   ----
   [//]: # (To review information about possible relevant labels for this issue 
please view the list of labels: 
https://gitlab.com/BuildStream/buildstream/labels)


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