Message-ID: <4f2dfd0c-9e57-46d0-86c9-c73955f90d1b@gmail.com>
Date: Fri, 20 Sep 2024 18:22:48 +0200
From: Mirsad Todorovac <mtodorovac69@...il.com>
To: netdev@...r.kernel.org
Cc: Bongsu Jeon <bongsu.jeon@...sung.com>, Shuah Khan <shuah@...nel.org>,
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [BUG] selftests/nci: ./nci_dev hang in wait4()

Hi, all,

I was testing Linux torvalds tree vanilla kernel, and I've noticed for a number of releases this
./nci_dev stops testing until it's terminated (15).

Now, I tried to examine what went wrong, I hoped it will go away by itself. it didn't, so I am posting
a bug report.

The ./nci_dev seems to be stuck in several processes waiting on each other. I was able to produce
stacktraces. I am unable to tell if it is testsuite bug or a problem in underlying syscalls.

user@...t:~/linux/kernel/linux_torvalds$ sudo gdb --pid 14132
GNU gdb (Ubuntu 15.0.50.20240403-0ubuntu1) 15.0.50.20240403-git
Copyright (C) 2024 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word".
Attaching to process 14132
Reading symbols from /home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/nci/nci_dev...
Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...
Reading symbols from /usr/lib/debug/.build-id/6d/64b17fbac799e68da7ebd9985ddf9b5cb375e6.debug...
Reading symbols from /lib64/ld-linux-x86-64.so.2...
Reading symbols from /usr/lib/debug/.build-id/35/3e1b6cb0eebc08cf3ff812eae8a51b4efd684e.debug...
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007be7cf3107a7 in __GI___wait4 (pid=pid@...ry=14133, stat_loc=stat_loc@...ry=0x7ffef60482dc, options=options@...ry=0, usage=usage@...ry=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:30

warning: 30	../sysdeps/unix/sysv/linux/wait4.c: No such file or directory
(gdb) where
#0  0x00007be7cf3107a7 in __GI___wait4 (pid=pid@...ry=14133, stat_loc=stat_loc@...ry=0x7ffef60482dc, options=options@...ry=0, usage=usage@...ry=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:30
#1  0x00007be7cf3108eb in __GI___waitpid (pid=pid@...ry=14133, stat_loc=stat_loc@...ry=0x7ffef60482dc, options=options@...ry=0) at ./posix/waitpid.c:38
#2  0x00005d550d59299b in wrapper_NCI_start_poll (_metadata=0x7be7cf486000, variant=0x5d550d597020 <_NCI_NCI2_0_object>) at nci_dev.c:625
#3  0x00005d550d591a94 in __run_test (f=f@...ry=0x5d550d5970a0 <_NCI_fixture_object>, variant=variant@...ry=0x5d550d597020 <_NCI_NCI2_0_object>, t=t@...ry=0x7be7cf486000) at ../kselftest_harness.h:1249
#4  0x00005d550d58fd47 in test_harness_run (argv=0x7ffef60488f8, argc=1) at ../kselftest_harness.h:1319
#5  main (argc=1, argv=0x7ffef60488f8) at nci_dev.c:904
(gdb) 

user@...t:~$ sudo gdb --pid 14133
GNU gdb (Ubuntu 15.0.50.20240403-0ubuntu1) 15.0.50.20240403-git
Copyright (C) 2024 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word".
Attaching to process 14133
[New LWP 14137]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007be7cf298d61 in __futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265, expected=14137, futex_word=0x7be7cf000990) at ./nptl/futex-internal.c:57

warning: 57	./nptl/futex-internal.c: No such file or directory
(gdb) where
#0  0x00007be7cf298d61 in __futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265, expected=14137, futex_word=0x7be7cf000990) at ./nptl/futex-internal.c:57
#1  __futex_abstimed_wait_common (cancel=true, private=128, abstime=0x0, clockid=0, expected=14137, futex_word=0x7be7cf000990) at ./nptl/futex-internal.c:87
#2  __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@...ry=0x7be7cf000990, expected=14137, clockid=clockid@...ry=0, abstime=abstime@...ry=0x0, private=private@...ry=128)
    at ./nptl/futex-internal.c:139
#3  0x00007be7cf29e793 in __pthread_clockjoin_ex (threadid=136235540547264, thread_return=thread_return@...ry=0x7ffef6047dd0, clockid=clockid@...ry=0, abstime=abstime@...ry=0x0, 
    block=block@...ry=true) at ./nptl/pthread_join_common.c:102
#4  0x00007be7cf29e633 in ___pthread_join (threadid=<optimized out>, thread_return=thread_return@...ry=0x7ffef6047dd0) at ./nptl/pthread_join.c:24
#5  0x00005d550d591e48 in NCI_setup (_metadata=_metadata@...ry=0x7be7cf486000, self=self@...ry=0x7ffef60482e0, variant=<optimized out>) at nci_dev.c:447
#6  0x00005d550d5929f3 in wrapper_NCI_start_poll (_metadata=0x7be7cf486000, variant=0x5d550d597020 <_NCI_NCI2_0_object>) at nci_dev.c:625
#7  0x00005d550d591a94 in __run_test (f=f@...ry=0x5d550d5970a0 <_NCI_fixture_object>, variant=variant@...ry=0x5d550d597020 <_NCI_NCI2_0_object>, t=t@...ry=0x7be7cf486000)
    at ../kselftest_harness.h:1249
#8  0x00005d550d58fd47 in test_harness_run (argv=0x7ffef60488f8, argc=1) at ../kselftest_harness.h:1319
#9  main (argc=1, argv=0x7ffef60488f8) at nci_dev.c:904
(gdb) 

I hope this can help you see what went wrong. The testing suite gets stuck on each run.

Best regards,
Mirsad Todorovac
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