Re: Relatively deterministic panic with sendfile(2) when running tests in the sxlock code

> On Oct 14, 2018, at 9:45 PM, Enji Cooper (yaneurabeya) <yaneurabeya_at_gmail.com> wrote:
> 
> 
> 
>> On Oct 14, 2018, at 7:25 PM, Gleb Smirnoff <glebius_at_freebsd.org <mailto:glebius_at_freebsd.org>> wrote:
>> 
>>  Hi Enji,
>> 
>> On Sun, Oct 14, 2018 at 06:51:42PM -0700, Enji Cooper (yaneurabeya) wrote:
>> E> Hi,
>> E> 	I’m seeing a semi-deterministic panic on 12.0-ALPHA9 related to sendfile(2) when running sendfile_test on the host: https://pastebin.com/raw/6Y7xg0ki <https://pastebin.com/raw/6Y7xg0ki>; it looks like it’s crashing in the sxlock code when calling sblock on a sockbuf. Are there any commands in gdb you would like me to run to display lock state?
>> E> 	Repro:
>> E>
>> E> mkdir /path/to/git/checkout
>> E> cd /path/to/git/checkout
>> E> git clone https://github.com/ngie-eign/freebsd/tree/sendfile_tests <https://github.com/ngie-eign/freebsd/tree/sendfile_tests> .
>> E> git checkout sendfile_tests
>> E> (cd lib/libc/tests/sys/; make obj; make; sudo make install)
>> E> kyua test -k /usr/tests/lib/libc/sys/Kyuafile sendfile_test
>> 
>> I'd like to reproduce it myself, but looks like URL is
>> wrong:
>> 
>> glebius_at_erla:/usr/src:|>git clone https://github.com/ngie-eign/freebsd/tree/sendfile_tests <https://github.com/ngie-eign/freebsd/tree/sendfile_tests>
>> Клонирование в «sendfile_tests»…
>> fatal: repository 'https://github.com/ngie-eign/freebsd/tree/sendfile_tests/ <https://github.com/ngie-eign/freebsd/tree/sendfile_tests/>' not found
> 
> Mea culpa. It should be:
> 
> $ git clone https://github.com/ngie-eign/freebsd.git <https://github.com/ngie-eign/freebsd.git> .
> 
> Another note is that I’m running GENERIC-NODEBUG, not GENERIC-DEBUG.
> 
> I suspect that it’s crashing on :hdtr_negative_bad_pointers or : s_negative_not_descriptor, because the other items don’t seem terribly plausible.
> 
> The test case (source) can be found here: https://github.com/ngie-eign/freebsd/blob/95b96470a3a0270c36c4e7fb5eedc150fe124fac/lib/libc/tests/sys/sendfile_test.c <https://github.com/ngie-eign/freebsd/blob/95b96470a3a0270c36c4e7fb5eedc150fe124fac/lib/libc/tests/sys/sendfile_test.c>
Aha! It was actually :s_negative_not_connected_socket.

Updated repro: use `kyua test -k /usr/tests/lib/libc/sys/Kyuafile sendfile_test:s_negative_not_connected_socket` instead of the other kyua call I provided.

Thanks!
-Enji