libks
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signalwire
testsuite occationally deadlocks
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.
I attached gdb to the deadlocked process:
ncopa-desktop:~/aports/main/libks (master)$ doas gdb -p 22041
doas (ncopa@ncopa-desktop) password:
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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)
This test is primitive. Something is blocking stdout. Try to run it with ctest -V -R log .
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?
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;
Something is blocking stdout.
The gdb backtrace shows that the deadlock happens in fread().
The proposed diff appears to fix it. I am not able to reproduce the deadlock with that change.
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: https://github.com/signalwire/libks/blob/0ac67b5ad514f15fa4274580533099acf2dc2403/src/ks_log.c#L321