Segfault when running `ucc_info`

[Niranda Perera]

I am getting a segfault on ucc_info.

niranda@#####:~/ucc$ ./install/bin/ucc_info -c
[gohan-compute-01:59038:0:59038] Caught signal 11 (Segmentation fault: address not mapped to object at address 0x20)
==== backtrace (tid:  59038) ====
 0  /lib/libucs.so.0(ucs_handle_error+0x2e4) [0x7f0767d8c474]
 1  /lib/libucs.so.0(+0x2f66f) [0x7f0767d8c66f]
 2  /lib/libucs.so.0(+0x2f956) [0x7f0767d8c956]
 3  /lib/x86_64-linux-gnu/libc.so.6(+0x42520) [0x7f0767e01520]
 4  /lib/libucs.so.0(ucs_config_clone_log_comp+0x8) [0x7f0767d7da08]
 5  /lib/libucs.so.0(ucs_config_parser_set_default_values+0x28) [0x7f0767d7ebe8]
 6  /lib/libucs.so.0(ucs_config_parser_fill_opts+0x26) [0x7f0767d7f196]
 7  /home/niranda/ucc/install/lib/libucc.so.1(ucc_config_parser_fill_opts+0x16) [0x7f0768016a76]
 8  /home/niranda/ucc/install/lib/libucc.so.1(ucc_constructor+0x7d) [0x7f0767ffed2d]
 9  /home/niranda/ucc/install/lib/libucc.so.1(ucc_lib_config_read+0x1a) [0x7f0767ffe8fa]
10  ./install/bin/ucc_info(+0x22a0) [0x555853f052a0]
11  /lib/x86_64-linux-gnu/libc.so.6(+0x29d90) [0x7f0767de8d90]
12  /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x80) [0x7f0767de8e40]
13  ./install/bin/ucc_info(+0x24d5) [0x555853f054d5]
=================================
Segmentation fault (core dumped)

I am using the following ucx version from conda

(ucc) niranda@######:~/ucc$ ucx_info -v 
# Library version: 1.15.0
# Library path: /home/niranda/envs/ucc/bin/../lib/libucs.so.0
# API headers version: 1.15.0
# Git branch '', revision 49ca22e
# Configured with: --disable-logging --disable-debug --disable-assertions --disable-params-check --build=x86_64-conda-linux-gnu --host=x86_64-conda-linux-gnu --prefix=/home/niranda/envs/ucc --with-sysroot --enable-cma --enable-mt --enable-numa --with-gnu-ld --with-cuda=/usr/local/cuda --with-rdmacm=/home/niranda/envs/ucc --with-verbs=/home/niranda/envs/ucc

Configured ucc as follows

./configure --with-ucx=$CONDA_PREFIX --prefix=$PWD/install

Could you please let me know what the problem here?

[Niranda Perera]

Downgrading ucx to 1.13.1 was a workaround. Isn't the ucc master branch in par with UCX releases?

[Sergey Lebedev]

It might happen due to missing backward compatibility in UCS. UCC uses UCS for different service functions (memory allocation, registration, parsing etc.) but UCS is not backward or forward compatible. So UCS runtime version should match UCS compile time version.