From: Ken Brown <kbrown@cornell.edu>
To: cygwin@cygwin.com
Subject: Re: mmap failure [was: cygrunsrv + sshd + rsync = 20 times too slow -- throttled?]
Date: Mon, 6 Sep 2021 14:40:40 -0400 [thread overview]
Message-ID: <3a63eb8c-3e8e-cd2c-b9de-8c34fa041a75@cornell.edu> (raw)
In-Reply-To: <YTZY/vytb7nagC6M@calimero.vinschen.de>
On 9/6/2021 2:07 PM, Corinna Vinschen via Cygwin wrote:
> On Sep 6 19:59, Corinna Vinschen via Cygwin wrote:
>> On Sep 6 13:38, Ken Brown via Cygwin wrote:
>>> On 9/6/2021 1:12 PM, Ken Brown via Cygwin wrote:
>>>> On 9/6/2021 11:32 AM, Corinna Vinschen via Cygwin wrote:
>>>>> On Sep 5 09:24, Ken Brown via Cygwin wrote:
>>>>>> On 9/4/2021 8:04 PM, Ken Brown via Cygwin wrote:
>>>>>>> On 9/4/2021 6:58 PM, Ken Brown via Cygwin wrote:
>>>>>>>> Here are the correct commits:
>>>>>>>>
>>>>>>>> 8169e39ab Cygwin: C++17: register keyword is deprecated
>>>>>>>> 3ca80b360 Cygwin: dumper: fix up GCC pragma for g++ 11.2
>>>>>>>> bdb7991db Cygwin: workaround a g++ 11.2 initialization bug
>>>>>>>> 801120c1f Cygwin: loader script: add DWARF 5 sections
>>>>>>>> d5cc66426 Cygwin: testsuite: avoid "conflicting types" gcc warning
>>>>>>>> c2fe205b5 strstr: avoid warnings
>>>>>>>> 76c2c7a89 ldexp/ldexpf: avoid assembler warning
>>>>>>>> eeeb5650c Cygwin: fix declaration of RtlInitEmptyUnicodeString
>>>>>>>>
>>>>>>>>>
>>>>>>>>>> So there appears to be something wrong with cygwin1.dll
>>>>>>>>>> built with the current build tools (gcc 11.2.0, binutils
>>>>>>>>>> 2.37, not sure what else is relevant).
>>>>>>>
>>>>>>> Wait a minute...I'll bet this is related to the MEM_EXTENDED_PARAMETER
>>>>>>> initialization problem that was dealt with in commit bdb7991db.
>>>>>>
>>>>>> More data: When I run the test case under gdb, it succeeds. When I run it
>>>>>> under strace, I see VirtualAlloc2 in fhandler_dev_zero::mmap failing with
>>>>>> windows error 87.
>>>>>
>>>>> Are the const's I added to the MEM_EXTENDED_PARAMETER data invalid,
>>>>> perhaps?
>>>>
>>>> I tried removing them, and I got the same error. I also tried removing
>>>> static, and I tried removing both static and const.
>>>
>>> BTW, when I reported that the test case succeeds under gdb, that only
>>> happens when I build the test case without optimization. If I build with
>>> -O2, it fails under gdb also. [In all my tests, I built cygwin1.dll without
>>> optimization.] This makes no sense to me at all.
>>
>> Good hint. I found the culprit. With optimization, the code doesn't
>> set the "Reserved" bits in the first struct of MEM_EXTENDED_PARAMETER
>> to 0.
>
> No, wait. I get what you say. The optimzation settings of the test
> case should have no influence on the code inside the DLL. That doesn't
> make sense for sure. However, I ran the testcase under GDB, I could
> reproduce the issue, and I could fix it by setting mmap_ext.Reserved = 0;
> Go figure!
I don't get it, but I can confirm that the problem is fixed.
Thanks.
Ken
next prev parent reply other threads:[~2021-09-06 18:40 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-24 19:49 cygrunsrv + sshd + rsync = 20 times too slow -- throttled? Chris Roehrig
2021-08-24 23:43 ` Mark Geisert
2021-08-25 0:35 ` Chris Roehrig
2021-08-25 2:12 ` Chris Roehrig
2021-08-25 2:02 ` NightStrike
2021-08-25 3:20 ` Mark Geisert
2021-08-25 17:24 ` Chris Roehrig
2021-08-25 11:18 ` Takashi Yano
2021-08-25 17:31 ` Chris Roehrig
2021-08-25 17:52 ` Ken Brown
2021-08-25 18:18 ` Chris Roehrig
2021-08-25 18:51 ` Chris Roehrig
2021-08-26 15:44 ` Ken Brown
2021-08-25 20:33 ` Mario Emmenlauer
2021-08-26 15:47 ` Ken Brown
2021-08-25 21:29 ` Takashi Yano
2021-08-26 15:56 ` Ken Brown
2021-08-26 22:18 ` Ken Brown
2021-08-27 11:24 ` Takashi Yano
2021-08-27 16:00 ` Ken Brown
2021-08-27 17:21 ` Takashi Yano
2021-08-28 2:00 ` Takashi Yano
2021-08-28 3:03 ` Takashi Yano
2021-08-28 8:43 ` Corinna Vinschen
2021-08-28 9:41 ` Takashi Yano
2021-08-28 11:58 ` Corinna Vinschen
2021-08-28 15:43 ` Takashi Yano
2021-08-28 20:55 ` Ken Brown
2021-08-29 8:41 ` Takashi Yano
2021-08-29 22:42 ` Ken Brown
2021-08-29 10:27 ` Corinna Vinschen
2021-08-29 9:07 ` Takashi Yano
2021-08-29 15:57 ` Ken Brown
2021-08-29 19:24 ` Chris Roehrig
2021-08-29 22:24 ` Ken Brown
2021-08-30 23:58 ` Chris Roehrig
2021-08-31 19:05 ` Ken Brown
2021-08-31 19:53 ` Chris Roehrig
2021-08-31 20:23 ` Chris Roehrig
2021-08-31 21:29 ` Brian Inglis
2021-09-01 21:11 ` Chris Roehrig
2021-09-02 15:25 ` Ken Brown
2021-09-02 19:03 ` Chris Roehrig
2021-09-03 17:26 ` Ken Brown
2021-09-03 19:55 ` Corinna Vinschen
2021-09-03 20:59 ` Chris Roehrig
2021-09-04 8:32 ` Achim Gratz
2021-09-04 16:45 ` Brian Inglis
2021-09-05 8:18 ` Achim Gratz
2021-09-05 15:11 ` Brian Inglis
2021-09-06 10:42 ` Achim Gratz
2021-09-04 22:37 ` mmap failure [was: cygrunsrv + sshd + rsync = 20 times too slow -- throttled?] Ken Brown
2021-09-04 22:54 ` Ken Brown
2021-09-04 22:58 ` Ken Brown
2021-09-05 0:04 ` Ken Brown
2021-09-05 13:24 ` Ken Brown
2021-09-06 15:32 ` Corinna Vinschen
2021-09-06 17:12 ` Ken Brown
2021-09-06 17:38 ` Ken Brown
2021-09-06 17:43 ` Eliot Moss
2021-09-06 17:59 ` Corinna Vinschen
2021-09-06 18:07 ` Corinna Vinschen
2021-09-06 18:40 ` Ken Brown [this message]
2021-09-06 20:52 ` Peter Dons Tychsen
2021-09-06 20:54 ` Peter Dons Tychsen
2021-09-06 21:24 ` Ken Brown
2021-09-06 21:31 ` Ken Brown
2021-09-07 3:34 ` Brian Inglis
2021-09-07 16:28 ` Ken Brown
2021-09-07 21:52 ` Lavrentiev, Anton (NIH/NLM/NCBI) [C]
2021-09-07 22:44 ` Ken Brown
2021-09-08 6:14 ` Sam Edge
2021-09-08 8:18 ` Corinna Vinschen
2021-09-07 21:41 ` Peter Dons Tychsen
2021-09-04 23:18 ` Brian Inglis
2021-08-29 19:37 ` cygrunsrv + sshd + rsync = 20 times too slow -- throttled? Takashi Yano
2021-08-29 21:09 ` Ken Brown
2021-08-29 21:04 ` Ken Brown
2021-08-30 0:13 ` Takashi Yano
2021-08-30 0:22 ` Takashi Yano
2021-08-30 2:15 ` Ken Brown
2021-08-30 8:02 ` Takashi Yano
2021-08-28 15:17 ` Ken Brown
2021-09-16 22:00 ` Keith Christian
2021-09-16 22:48 ` Ken Brown
2021-09-16 22:58 ` Keith Christian
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