[Bug 279354] New test kern/unix_seqpacket_test:random_eor_and_waitall reliably fails

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279354

            Bug ID: 279354
           Summary: New test
                    kern/unix_seqpacket_test:random_eor_and_waitall
                    reliably fails
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: tests
          Assignee: testing@FreeBSD.org
          Reporter: rlibby@freebsd.org

The new test kern/unix_seqpacket_test:random_eor_and_waitall reliably
fails in both CI and in my manual testing on an amd64 GENRIC VM.

The test was added here:
https://cgit.freebsd.org/src/commit/?id=eb338e2370b4644382e6404d7402bc05eef13e54
eb338e2370b4 tests/unix_seqpacket: provide random data pumping test with
MSG_EOR

Here is a failure in CI from April 9, the first run I could find after
the test was committed:
https://ci.freebsd.org/job/FreeBSD-main-amd64-test/25066/testReport/sys.kern/unix_seqpacket_test/random_eor_and_waitall/
and is still failing as of the latest run on May 19:
https://ci.freebsd.org/job/FreeBSD-main-amd64-test/25240/testReport/sys.kern/unix_seqpacket_test/random_eor_and_waitall/

It fails for me every time when run with this on an amd64 GENERIC vm:
kyua debug -k /usr/tests/sys/Kyuafile
kern/unix_seqpacket_test:random_eor_and_waitall

I've seen it fail in a few different ways:

> % for i in {1..10}; do kyua debug -k /usr/tests/sys/Kyuafile kern/unix_seqpacket_test:random_eor_and_waitall; done
> Using seed: 0x41fd, 0xd11e, 0x7725, 0xadf8, 0xe04f, 0x1d61,
> *** Check failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1255: len != iov.iov_len: recvmsg(MSG_WAITALL): 1132, expected 3141
> kern/unix_seqpacket_test:random_eor_and_waitall  ->  failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1182: send(params->sock, &params->sendbuf[off], len, flags) == len not met
> Using seed: 0x8fa8, 0xdbe5, 0x1403, 0xb14d, 0x84f8, 0xfbd0,
> kern/unix_seqpacket_test:random_eor_and_waitall  ->  failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1182: send(params->sock, &params->sendbuf[off], len, flags) == len not met
> Using seed: 0x5b73, 0xc363, 0x39d7, 0xc52a, 0xfa9d, 0x15ab,
> *** Check failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1255: len != iov.iov_len: recvmsg(MSG_WAITALL): 4484, expected 27917
> kern/unix_seqpacket_test:random_eor_and_waitall  ->  failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1269: data corruption past 4923
> Using seed: 0xaa47, 0x3831, 0xb603, 0x97df, 0xb839, 0x0109,
> *** Check failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1255: len != iov.iov_len: recvmsg(MSG_WAITALL): 4525, expected 9299
> kern/unix_seqpacket_test:random_eor_and_waitall  ->  failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1182: send(params->sock, &params->sendbuf[off], len, flags) == len not met
> Using seed: 0x679a, 0xc263, 0xa25f, 0x348c, 0x2d3a, 0x0cd2,
> kern/unix_seqpacket_test:random_eor_and_waitall  ->  failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1182: send(params->sock, &params->sendbuf[off], len, flags) == len not met
> Using seed: 0xaa1e, 0x7317, 0x2dde, 0xe299, 0x1139, 0xf8d8,
> kern/unix_seqpacket_test:random_eor_and_waitall  ->  failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1182: send(params->sock, &params->sendbuf[off], len, flags) == len not met
> Using seed: 0x6b58, 0x2247, 0x5d93, 0x9c57, 0x326d, 0x1614,
> *** Check failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1255: len != iov.iov_len: recvmsg(MSG_WAITALL): 682, expected 24997
> kern/unix_seqpacket_test:random_eor_and_waitall  ->  failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1182: send(params->sock, &params->sendbuf[off], len, flags) == len not met
> Using seed: 0x8eca, 0xc5bd, 0xc09d, 0xe15e, 0xe7c3, 0xfdad,
> kern/unix_seqpacket_test:random_eor_and_waitall  ->  failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1182: send(params->sock, &params->sendbuf[off], len, flags) == len not met
> Using seed: 0x2859, 0x311b, 0x69d4, 0xd44c, 0xce3d, 0xe01b,
> kern/unix_seqpacket_test:random_eor_and_waitall  ->  failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1182: send(params->sock, &params->sendbuf[off], len, flags) == len not met
> Using seed: 0x0329, 0x992f, 0x6937, 0x766c, 0x47e5, 0x5270,
> kern/unix_seqpacket_test:random_eor_and_waitall  ->  failed: /usr/src/freebsd/tests/sys/kern/unix_seqpacket_test.c:1182: send(params->sock, &params->sendbuf[off], len, flags) == len not met

I traced the the errno for the send() failure as EMSGSIZE.

The test should be adjusted not to produce a failure.

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