Date: Tue, 23 Jul 2024 15:56:49 +0200 From: Michal Meloun <meloun.michal@gmail.com> To: Konstantin Belousov <kib@freebsd.org> Cc: Mark Millard <marklmi@yahoo.com>, mmel@freebsd.org, FreeBSD Current <freebsd-current@freebsd.org>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: armv7-on-aarch64 stuck at urdlck Message-ID: <31690db8-e563-491f-ae91-f235aec8c24c@gmail.com> In-Reply-To: <Zp95qtxK0CeDdp-d@kib.kiev.ua> References: <724db42b-5550-4381-8277-2971e6b3e8f1@freebsd.org> <B5E2275D-21F0-43C8-AF06-A45DB7448D66@yahoo.com> <86185657-e521-466b-89e2-f291aaac10a6@freebsd.org> <0EF18174-8735-46A4-BD71-FFA3472B319F@yahoo.com> <a1b978fe-ff54-4112-860c-b09500d89d0b@freebsd.org> <C0B42CBB-8F12-4597-A04B-26F2107E176E@yahoo.com> <33251aa3-681f-4d17-afe9-953490afeaf0@gmail.com> <0DD19771-3AAB-469E-981B-1203F1C28233@yahoo.com> <be023545-2b25-49ec-b6f1-9e05cd402646@gmail.com> <Zp95qtxK0CeDdp-d@kib.kiev.ua>
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On 23.07.2024 11:36, Konstantin Belousov wrote:
> On Tue, Jul 23, 2024 at 09:53:41AM +0200, Michal Meloun wrote:
>> The good news is that I'm finally able to generate a working/locking
>> test case. The culprit (at least for me) is if "-mcpu" is used when
>> compiling libthr (e.g. indirectly injected via CPUTYPE in /etc/make.conf).
>> If it is not used, libthr is broken (regardless of -O level or debug/normal
>> build), but -mcpu=cortex-a15 will always produce a working libthr.
>
> I think this is very significant progress.
>
> Do you plan to drill down more to see what is going on?
Sure. Fortunately, I have some free time now. I've just almost finished
a two-years project (unrelated to FBSD or computers) that took up all my
time.
Another symptom is that:
Breakpoint 2.2, _umtx_op_err (obj=0x20135cc0, op=UMTX_OP_RW_RDLOCK,
val=0, uaddr=0x0, uaddr2=0x0) at /usr/src/lib/libsys/_umtx_op_err.c:36
where obj=0x20135cc0 --->
{rw_state = URWLOCK_WRITE_OWNER , rw_flags = 2,
rw_blocked_readers = 0, rw_blocked_writers = 0,
rw_spare = {0, 0, 0, 0}}
always return EINTR.
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