Re: Recurring INEQUIVALENT ALIASES issues and userland corruption/crashes

[Sam James <sam@gentoo.org>]

[-- Attachment #1: Type: text/plain, Size: 2928 bytes --]



> On 22 Mar 2022, at 18:19, John David Anglin <dave.anglin@bell.net> wrote:
> 
> On 2022-03-22 1:52 p.m., Sam James wrote:
>> Hi all,
>> 
>> In Gentoo, we've just got our hands on an RP3440 (PA8800) which seems to quite easily hit inequivalent aliasing issues.
>> 
>> We've found that under some workloads, the machine copes fine, none of that appears in dmesg, and all is well - even for
>> over a week. But as soon as we start other workloads (the problematic one is building "stages" -- release media for Gentoo),
>> within 30m or so, the machine is in a broken state, with these messages flooding dmesg:
>> ```
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x42994000 and 0x426e1000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x426e1000 and 0x41b56000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x41b56000 and 0x41aae000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x41aae000 and 0x42774000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x42774000 and 0x41202000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x41202000 and 0x428dd000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x41e2c000 and 0x418f6000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x418f6000 and 0x42980000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x42980000 and 0x426cd000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x426cd000 and 0x41b42000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x41b42000 and 0x41a9a000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x41a9a000 and 0x42760000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x42760000 and 0x411ee000 in file bash
>> Mar 22 04:19:55 muta.hppa.dev.gentoo.org kernel: INEQUIVALENT ALIASES 0x411ee000 and 0x428c9000 in file bash
> I don't think this is new.  There are no changes to the code that detects INEQUIVALENT ALIASES in the latest pull.
> 

Sorry, to be clear: I wasn't trying to suggest the issue is new -- just saying that we've been trying 5.10, 5.15+ to
see if latest changes helped at all, but they haven't.

In our experience so far, there has been no good kernel version for us on this hardware.

> I've seen this before but it's not occurring in my current builds for rp3440 and c8000.  I've been running for-next
> changes on c8000 for several weeks.
> 

Yeah, I haven't seen this at all on my C8000 (or Gentoo's other HW, a C3600).

> I suspect a problem with shmat but I'm not sure.
>> [snip]

best,
sam


[-- Attachment #2: Message signed with OpenPGP --]
[-- Type: application/pgp-signature, Size: 618 bytes --]