testsuite occationally deadlocks

[ncopa]

When building alpine 3.22 we have observed deadlocks when running ctest. This has been seen on multiple architectures, riscv64, x86_64, ppc64le.

I was able to reproduce it on my desktop i9:

[56/68] Creating library symlink libks2.so
[57/68] Linking C executable tests/testjson
[58/68] Linking C executable tests/testlog
[59/68] Linking C executable tests/teststring
[60/68] Linking C executable tests/testwebsock2
[61/68] Linking C executable tests/testwebsock
[62/68] Linking C executable tests/testsock2
[63/68] Linking C executable tests/testsock
[64/68] Linking C executable tests/testhash
[65/68] Linking C executable tests/testthreadpools
[66/68] Linking C executable tests/testacl
[67/68] Linking C executable tests/testrealloc
[68/68] Linking C executable tests/testpools
Test project /home/ncopa/aports/main/libks/src/libks-2.0.6
      Start  1: testpools
      Start  2: testrealloc
      Start  3: testacl
      Start  4: testthreadpools
      Start  5: testhash
      Start  6: testsock
      Start  7: testsock2
      Start  8: testwebsock
      Start  9: testwebsock2
      Start 10: teststring
      Start 11: testlog
      Start 12: testjson
 1/12 Test  #1: testpools ........................   Passed    0.01 sec
 2/12 Test  #2: testrealloc ......................   Passed    0.01 sec
 3/12 Test  #3: testacl ..........................   Passed    0.01 sec
 4/12 Test  #7: testsock2 ........................   Passed    0.00 sec
 5/12 Test #10: teststring .......................   Passed    0.00 sec
 6/12 Test #12: testjson .........................   Passed    0.00 sec
 7/12 Test  #9: testwebsock2 .....................   Passed    0.02 sec
 8/12 Test  #8: testwebsock ......................   Passed    0.12 sec
 9/12 Test  #6: testsock .........................   Passed    2.04 sec
10/12 Test  #4: testthreadpools ..................   Passed    5.01 sec
11/12 Test  #5: testhash .........................   Passed    9.01 sec

And there it hangs.

It appears to be the test #11 that deadlocks, testlog.

I have no idea how to debug it.

[ncopa]

I attached gdb to the deadlocked process:

ncopa-desktop:~/aports/main/libks (master)$ doas gdb -p 22041
doas (ncopa@ncopa-desktop) password: 
GNU gdb (GDB) 15.2
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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-alpine-linux-musl".
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 22041
Reading symbols from /proc/22041/exe...
Reading symbols from /home/ncopa/aports/main/libks/src/libks-2.0.6/libks2.so.2...
Reading symbols from /lib/ld-musl-x86_64.so.1...
Reading symbols from /usr/lib/debug//lib/ld-musl-x86_64.so.1.debug...
Reading symbols from /usr/lib/libssl.so.3...
(No debugging symbols found in /usr/lib/libssl.so.3)
Reading symbols from /usr/lib/libcrypto.so.3...
(No debugging symbols found in /usr/lib/libcrypto.so.3)
Reading symbols from /usr/lib/libuuid.so.1...
(No debugging symbols found in /usr/lib/libuuid.so.1)
0x00007f047abcb3be in __syscall3 (n=0, a1=4, a2=139657214301792, a3=1024) at ./arch/x86_64/syscall_arch.h:29

warning: 29	./arch/x86_64/syscall_arch.h: No such file or directory
(gdb) info threads
  Id   Target Id               Frame 
* 1    process 22041 "testlog" 0x00007f047abcb3be in __syscall3 (n=0, a1=4, a2=139657214301792, a3=1024) at ./arch/x86_64/syscall_arch.h:29
(gdb) bt
#0  0x00007f047abcb3be in __syscall3 (n=0, a1=4, a2=139657214301792, a3=1024) at ./arch/x86_64/syscall_arch.h:29
#1  __stdio_read (f=0x7f047aa61570, 
    buf=0x7ffc3ffedfd7 "a [EMERG] 14:37:20 #00005619 ", 'a' <repeats 32 times>, ":9999999 ", 'a' <repeats 48 times>, " ", 'a' <repeats 81 times>..., len=1)
    at src/stdio/__stdio_read.c:13
#2  0x00007f047abccccb in fread (destv=<optimized out>, size=1, nmemb=1024, f=0x7f047aa61570) at src/stdio/fread.c:27
#3  0x00007f047ab4d428 in default_logger () from /home/ncopa/aports/main/libks/src/libks-2.0.6/libks2.so.2
#4  0x00007f047ab4d5f7 in ks_log () from /home/ncopa/aports/main/libks/src/libks-2.0.6/libks2.so.2
#5  0x0000557aed0c3264 in main ()
(gdb) 

[morbit85]

This test is primitive. Something is blocking stdout. Try to run it with ctest -V -R log .

[ncopa]

ncopa-desktop:~/aports/main/libks/src/libks-2.0.6 (master)$ ctest -V -R log .
UpdateCTestConfiguration  from :/home/ncopa/aports/main/libks/src/libks-2.0.6/DartConfiguration.tcl
UpdateCTestConfiguration  from :/home/ncopa/aports/main/libks/src/libks-2.0.6/DartConfiguration.tcl
Test project /home/ncopa/aports/main/libks/src/libks-2.0.6
Constructing a list of tests
Done constructing a list of tests
Updating test list for fixtures
Added 0 tests to meet fixture requirements
Checking test dependency graph...
Checking test dependency graph end
test 11
    Start 11: testlog

11: Test command: /home/ncopa/aports/main/libks/src/libks-2.0.6/tests/testlog
11: Working Directory: /home/ncopa/aports/main/libks/src/libks-2.0.6/tests
11: Test timeout computed to be: 10000000
11:  [DEBUG] 19:01:31 #00001462 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa:9999999 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa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11: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

And there it hangs.

The wakeup_stdout function looks a bit suspicious. There is a race between select() and fread(). Probably better avoid stdio and use raw read(2) there in non-blocking mode?

[ncopa]

Maybe something like this?

diff --git a/src/ks_log.c b/src/ks_log.c
index ae785e5..870052e 100644
--- a/src/ks_log.c
+++ b/src/ks_log.c
@@ -108,35 +108,21 @@ static void __set_blocking(int fd, int blocking)
 static ks_bool_t wakeup_stdout()
 {
        char procpath[256];
-       FILE *fp = NULL;
-       fd_set set;
-       struct timeval timeout;
+       int fd;
        ks_bool_t done_reading = KS_FALSE;
        char buf[1024];
        size_t skipped = 0;
        
        snprintf(procpath, sizeof(procpath), "/proc/%d/fd/%d", getpid(), fileno(stdout));
-       if ((fp = fopen(procpath, "r")) == NULL) {
+       if ((fd = open(procpath, O_RDONLY)) < 0) {
                g_wakeup_stdout_fails++;
                return KS_FALSE;
        }
 
-       timeout.tv_sec = 0;
-       timeout.tv_usec = 0;
-
-       while (!done_reading) {
-               FD_ZERO(&set);
-               FD_SET(fileno(fp), &set);
-               
-               if (select(fileno(fp) + 1, &set, NULL, NULL, &timeout) != 1) {
-                       done_reading = KS_TRUE;
-               } else {
-                       size_t consumed = fread(buf, 1, sizeof(buf), fp);
-                       skipped += consumed;
-                       done_reading = consumed < sizeof(buf);
-               }
-       }
-       fclose(fp);
+       __set_blocking(fd, 0);
+       // read until EAGAIN
+       while (read(fd, buf, sizeof(buf)) > 0);
+       close(fd);
 
        g_wakeup_stdout_successes++;
        return KS_TRUE;

[ncopa]

Something is blocking stdout.

The gdb backtrace shows that the deadlock happens in fread().

[ncopa]

The proposed diff appears to fix it. I am not able to reproduce the deadlock with that change.

[ncopa]

But really, I don't understand why we can not let the OS handle it, like it appears to be done originally, in the commented out line:

libks/src/ks_log.c

Line 321 in 0ac67b5

//fprintf(stdout, "[%s] %s:%d %s() %s", LEVEL_NAMES[level], fp, line, func, data);