On 8/7/23 22:46, Kuniyuki Iwashima wrote:
From: Mirsad Todorovac <mirsad.todorovac@xxxxxxxxxxxx> Date: Mon, 7 Aug 2023 21:44:41 +0200Hi all, In the kernel 6.5-rc5 build on Ubuntu 22.04 LTS (jammy jellyfish) on a Ryzen 7950 assembled box, vanilla torvalds tree kernel, the test test_unix_oob unexpectedly fails: # selftests: net/af_unix: test_unix_oob # Test 2 failed, sigurg 23 len 63 OOB % It is this code: /* Test 2: * Verify that the first OOB is over written by * the 2nd one and the first OOB is returned as * part of the read, and sigurg is received. */ wait_for_data(pfd, POLLIN | POLLPRI); len = 0; while (len < 70) len = recv(pfd, buf, 1024, MSG_PEEK); len = read_data(pfd, buf, 1024); read_oob(pfd, &oob); if (!signal_recvd || len != 127 || oob != '#') { fprintf(stderr, "Test 2 failed, sigurg %d len %d OOB %c\n", signal_recvd, len, oob); die(1); } In 6.5-rc4, this test was OK, so it might mean we have a regression?Thanks for reporting. I confirmed the test doesn't fail on net-next at least, but it's based on v6.5-rc4. ---8<--- [root@localhost ~]# ./test_unix_oob [root@localhost ~]# echo $? 0 [root@localhost ~]# uname -r 6.5.0-rc4-01192-g66244337512f ---8<--- I'll check 6.5-rc5 later.
Hi, Kuniyuki, It seems that there is a new development. I could reproduce the error with the failed test 2 as early as 6.0-rc1. However, the gotcha is that the error appears to be sporadically manifested (possibly a race)? I am currently attempting a bisect. Kind regards, Mirsad
marvin@defiant:~/linux/kernel/linux_torvalds$ grep test_unix_oob ../kselftest-6.5-rc4-1.log /net/af_unix/test_unix_oob # selftests: net/af_unix: test_unix_oob ok 2 selftests: net/af_unix: test_unix_oob marvin@defiant:~/linux/kernel/linux_torvalds$ Hope this helps. NOTE: the kernel is vanilla torvalds tree, only "dirty" because the selftests were modified. Kind regards, Mirsad Todorovac
