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Subject: Re: Random "child_info_fork::abort:"
To: cygwin AT cygwin DOT com
References: <85b945fb-0b5f-e2b3-b899-99176d6e4da2 AT yandex DOT ru> <d879b90e-70b4-2b08-5c5b-3faccd89365b AT SystematicSw DOT ab DOT ca> <d4735765-890e-a34b-93ee-d17b9c102a9d AT yandex DOT ru> <fb13f38f-2d08-d575-f85a-2dead5c56c0b AT yandex DOT ru> <ad9ab025-b9bb-6600-0160-462e4794d270 AT yandex DOT ru>
From: Evgeny Grin <k2k AT yandex DOT ru>
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Date: Thu, 13 Oct 2016 18:24:09 +0300
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On 13.10.2016 10:11, Evgeny Grin wrote:
> On 12.10.2016 21:45, Evgeny Grin wrote:
>> On 12.10.2016 13:59, Evgeny Grin wrote:
>>> On 12.10.2016 8:59, Brian Inglis wrote:
>>>> On 2016-10-11 15:32, Evgeny Grin wrote:
>>>>> I'm using Windows Insider (slow ring, prerelease). After recent update
>>>>> to build 14931, cygwin keeps randomly fail on fork. This happens not
>>>>> every fork, but frequent enough. Simplest way to trigger it is to run
>>>>> mandb.
>>>>> At variable delay I got something like
>>>>> child_info_fork::abort: T:\cygwin64\bin\cygman-2-7-5.dll: Loaded to
>>>>> different address: parent(0x3FEAB0000) != child(0x1C0000)
>>>>> Dll name and child address may vary.
>>>>> I updated cygwin to latest version, but problem remains.
>>>>> Exactly the same problem with Msys2, but additionally from time to time
>>>>> I got different error:
>>>>> *** fatal error - cygheap base mismatch detected - 0x1802FE408/0x106E408.
>>>>> This problem is probably due to....
>>>>
>>>>> I set variable CYGWIN=detect_bloda, but nothing is detected.
>>>>> What else could I check?
>>>>
>>>> Run rebase -is to check for DLL conflicts.
>>>> After the update did you run "rebase-trigger full" and setup,
>>>> with NO Cygwin processes running, to remap the system DLLs
>>>> and rebase the Cygwin DLLs?
>>>
>>> Done. No conflicts.
>>> Setup run fine, problem is not solved.
>>>
>>> Observation: Cygwin errors appears more often than Msys2 errors.
>>> Even got initial loading on incorrect address:
>>>
>>> child_info_fork::abort: T:\cygwin64\bin\cygman-2-7-5.dll: Loaded to
>>> different address: parent(0x190000) != child(0x3FB700000)
>>>
>>>> It's likely the Insider debug builds dynamically enable/disable
>>>> features and functions or run alternate system DLLs which gather
>>>> info by acting as BLODAs.
>>>> MS can mess around with your systems to enable new stuff (possibly
>>>> in different combinations) and see which systems they cause problems
>>>> on.
>>>> Hopefully they can also dynamically revert new releases causing
>>>> problems.
>>>> Your systems are the canaries for their Continuous Delivery QA.
>>>>
>>>> Make sure you continously back up any work on those systems and
>>>> don't ignore warnings, especially build expiries (you are meant
>>>> to be allowed 3 reboots after expiry before the buildrefuses
>>>> to boot!)
>>>
>>> Thanks!
>>> Not sure that situation is just "test" or "temporary". I'm using
>>> prerelease track so this can go to release.
>>
>> Additionally tested under VM.
>> Clear install of Windows 10 x64 14931 (US English), VM guest tools and
>> Cygwin x64. First run of man-db - same error.
>> Need new workarounds?
>> Seems that will be in all new builds.
> 
> Same happens with new Windows build 14942.
> Both Cygwin and Msys2 is not usable anymore.
> 
> MS is pushing us to "Ubuntu on Windows"?
> 

When trying to actively use cygwin, got same (as in Msys2) errors:

 *** fatal error - cygheap base mismatch detected - 0x180302408/0x1082408.

Is it because of cygwin.dll loaded on incorrect address?

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