[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Ned Deily  added the comment:


New changeset b962544594c6a7c695330dd20fedffb3a1916ba6 by Miss Islington (bot) 
in branch '3.10':
bpo-34602: Fix unportable test(1) operator in configure script (GH-30490) 
(GH-30491)
https://github.com/python/cpython/commit/b962544594c6a7c695330dd20fedffb3a1916ba6


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[miss-islington]

Change by miss-islington :


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Thomas Klausner]

Change by Thomas Klausner :


--
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nosy_count: 8.0 -> 9.0
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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Ned Deily  added the comment:

> @ned.deily, @lukasz.langa: reopen this issue or open a new one?

Since there are so many iterations on this issue already, I think a new issue 
would be better.

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ronald Oussoren]

Ronald Oussoren  added the comment:

> My understanding of the resolution of this ticket is that it is still not 
> possible to use setrlimit with RLIMIT_STACK to raise the soft stack limit.  
> Is that correct?

Yes, the code in msg324731 still fails. We're still using the mechanism 
described in msg324818, but with a larger stack size for some builds. 

It is rather annoying that -Wl,-stack_size, sets a hard limit on the stack 
size, rather than overriding the soft limit.  

I guess we could change the startup code for the interpreter executable 
(Py_Main or related code) to set the RLIMIT_STACK to a larger value when it is 
too small, that way applications can still pick a different (and in particular 
larger) value.

@ned.deily, @lukasz.langa: reopen this issue or open a new one?

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Jean-Paul Calderone]

Jean-Paul Calderone  added the comment:

My understanding of the resolution of this ticket is that it is still not 
possible to use setrlimit with RLIMIT_STACK to raise the soft stack limit.  Is 
that correct?

In that case, the original bug report still seems valid and unresolved (and 
indeed, I am porting a project from Python 2.7 to Python 3.9 and on macOS it 
fails because it cannot raise the stack limit).

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset 2563dd2d0a1cf793afca328ae9e195b72bd2b391 by Łukasz Langa in 
branch '3.10':
[3.10] bpo-34602: Quadruple stack size on macOS when compiling with UBSAN 
(GH-27309) (GH-28280)
https://github.com/python/cpython/commit/2563dd2d0a1cf793afca328ae9e195b72bd2b391


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Łukasz Langa]

Change by Łukasz Langa :


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset be9de8721d63b9d8e032d508069daf88c06542c6 by Łukasz Langa in 
branch 'main':
bpo-34602: Quadruple stack size on macOS when compiling with UBSAN (GH-27309)
https://github.com/python/cpython/commit/be9de8721d63b9d8e032d508069daf88c06542c6


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Chih-Hsuan Yen]

Change by Chih-Hsuan Yen :


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Łukasz Langa]

Change by Łukasz Langa :


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pull_request: https://github.com/python/cpython/pull/27309

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Ned Deily  added the comment:


New changeset dcc0eb379613f279864af61023ea44c94aa0535c by Ned Deily (Miss 
Islington (bot)) in branch '3.7':
bpo-34602: Avoid failures setting macOS stack resource limit (GH-14546)
https://github.com/python/cpython/commit/dcc0eb379613f279864af61023ea44c94aa0535c


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Change by Ned Deily :


--
priority: release blocker -> 
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Ned Deily  added the comment:


New changeset 782854f90ad5f73f787f68693d535f2b05514e13 by Ned Deily (Miss 
Islington (bot)) in branch '3.6':
bpo-34602: Avoid failures setting macOS stack resource limit (GH-14546) 
(GH-14549)
https://github.com/python/cpython/commit/782854f90ad5f73f787f68693d535f2b05514e13


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[miss-islington]

miss-islington  added the comment:


New changeset bf82cd3124df94935c6e3190c7c40b76918d2174 by Miss Islington (bot) 
in branch '3.7':
bpo-34602: Avoid failures setting macOS stack resource limit (GH-14546)
https://github.com/python/cpython/commit/bf82cd3124df94935c6e3190c7c40b76918d2174


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[miss-islington]

miss-islington  added the comment:


New changeset bd92b94da93198c8385c06ca908407f172c7e8b2 by Miss Islington (bot) 
in branch '3.8':
bpo-34602: Avoid failures setting macOS stack resource limit (GH-14546)
https://github.com/python/cpython/commit/bd92b94da93198c8385c06ca908407f172c7e8b2


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Ned Deily  added the comment:


New changeset 5bbbc733e6cc0804f19b071944af8d4719e26ae6 by Ned Deily in branch 
'master':
bpo-34602: Avoid failures setting macOS stack resource limit (GH-14546)
https://github.com/python/cpython/commit/5bbbc733e6cc0804f19b071944af8d4719e26ae6


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[miss-islington]

Change by miss-islington :


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[miss-islington]

Change by miss-islington :


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[miss-islington]

Change by miss-islington :


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Change by Ned Deily :


--
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stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/14546

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Ned Deily  added the comment:

> So we should keep an eye open for reports of segfaults running tests as 
> originally reported in Issue18075.

Now there are such reports for 3.7.4rc1, at least. Release builds seem to be OK 
but at least four tests now fail on macOS 10.14.5 when built --with-pydebug: 
test_exceptions test_json test_logging test_sys test_traceback.  Plus, changing 
the interpreters stack size can inhibit use of dtrace.

There are really two attempts at dealing with macOS's small default stack size. 
 The original workaround, dating back to 2002-12-02 
(bb48465273d2aa98fc7669e99b0d5fb1c57962de !!) added the runtime calls in 
regrtest to change RLIMIT_STACK. Years later, a different approach was taken in 
the original change for Issue18075 (335ab5b66f432ae3713840ed2403a11c368f5406) 
by increasing the default stack size when building the interpreter rather than 
at runtime.  So, I *think* that means that the original regrtest runtime 
workaround is really no longer needed.  So I think we should take the opposite 
approach to what I originally merged back in April, that is, we should go back 
to building the interpreter with the increased stack size and remove the 
ancient regrtest workaround attempt: that's what was failing here anyway.  The 
only place in the source base that resource.RLIMIT_STACK is used, outside of 
its functional test, is the old regrtest workaround.  It's still a bit of a 
mystery as what has 
 changed in 3.8 that seems to not hit the stack size limit but these kind of 
test failures on macOS have always been dependent on other factors, including 
compiler version and options.  I'd like to get this into 3.8.0b2 and 3.7.4rc2 
ao I'm temporarily making it a "release blocker"; the PR will follow 
momentarily.

--
nosy: +lukasz.langa
priority: normal -> release blocker
resolution: fixed -> 
stage: resolved -> needs patch
status: closed -> open
versions: +Python 3.9

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Ned Deily  added the comment:

Thanks for the analyses everyone!  Also see the discussion in duplicate 
Issue36432.  I was never able to reproduce the failure on earlier versions of 
macOS but then it seemed to become a hard failure with the release of 10.14.4.  
I haven't gone back and tried running the tests on all supported older versions 
with this reversion in place but those I have did not exhibit any new failures. 
 So we should keep an eye open for reports of segfaults running tests as 
originally reported in Issue18075.  But better that then not being able to run 
any tests.  "Fixed" in 3.8.0a4, 3.7.4, and 3.6.9 (to allow tests to be run on 
macOS) by reverting the change for Issue18075.

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Ned Deily  added the comment:


New changeset fbe2a1394bf52f5a4455681e1b1f705a31559585 by Ned Deily (Miss 
Islington (bot)) in branch '3.6':
bpo-34602: Avoid failures setting macOS stack resource limit (GH-13011) 
(GH-13014)
https://github.com/python/cpython/commit/fbe2a1394bf52f5a4455681e1b1f705a31559585


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[miss-islington]

Change by miss-islington :


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[miss-islington]

miss-islington  added the comment:


New changeset 52a5b71063af68c42b048095c4e555e93257f151 by Miss Islington (bot) 
in branch '3.7':
bpo-34602: Avoid failures setting macOS stack resource limit (GH-13011)
https://github.com/python/cpython/commit/52a5b71063af68c42b048095c4e555e93257f151


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[miss-islington]

Change by miss-islington :


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Ned Deily  added the comment:


New changeset 883dfc668f9730b00928730035b5dbd24b9da2a0 by Ned Deily in branch 
'master':
bpo-34602: Avoid failures setting macOS stack resource limit (GH-13011)
https://github.com/python/cpython/commit/883dfc668f9730b00928730035b5dbd24b9da2a0


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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ned Deily]

Change by Ned Deily :


--
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stage:  -> patch review

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Chih-Hsuan Yen]

Chih-Hsuan Yen  added the comment:

I guess Inada Naoki was to say https://bugs.python.org/issue36432 in the last 
comment.

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Inada Naoki]

Inada Naoki  added the comment:

https://bugs.python.org/issue34602 may be relating to this.

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[marche147]

marche147  added the comment:

Thanks for the repro! It did help for pinpointing the issue.

So I took a little spare time and dived into xnu kernel code, here is my 
assumption based on what I found (N.B. : My assumption comes from a simple 
experiment and a brief skim of the source code within 15 minutes or less, it 
could be seriously wrong since I'm not an expert of XNU kernel, and I currently 
don't have the time to build and debug it.) :

In bsd/kern/kern_resource.c, there's a function `dosetrlimit` which handles the 
`setrlimit` request, and here's part of it:

```
  case RLIMIT_STACK:
// ...
if (limp->rlim_cur > alimp->rlim_cur) {
  user_addr_t addr;
  user_size_t size;

/* grow stack */
size = round_page_64(limp->rlim_cur);
size -= round_page_64(alimp->rlim_cur);

  addr = p->user_stack - round_page_64(limp->rlim_cur);
  kr = mach_vm_protect(current_map(),
   addr, size,
   FALSE, VM_PROT_DEFAULT);
  if (kr != KERN_SUCCESS) {
error =  EINVAL;
goto out;
  }
} // ...

```

As we can see, the kernel will try to `mprotect` the memory preceding the stack 
to `VM_PROT_DEFAULT` (presumably read & write). I then used `vmmap` to see the 
difference between two binaries compiled with different commands. And the 
results are : 

1. Binary compiled without default stack size:

```
- Before calling setrlimit

...
STACK GUARD7ffee76d9000-7ffeeaed9000 [ 56.0M 0K 0K  
   0K] ---/rwx SM=NUL  stack guard for thread 0
...
Stack  7ffeeaed9000-7ffeeb6d9000 [ 8192K20K20K  
   0K] rw-/rwx SM=PRV  thread 0
...
VIRTUAL RESIDENTDIRTY  SWAPPED VOLATILE   
NONVOLEMPTY   REGION
REGION TYPESIZE SIZE SIZE SIZE SIZE 
SIZE SIZECOUNT (non-coalesced)
=== === =  ===    
===  ===
Kernel Alloc Once8K   4K   4K   0K   0K 
  0K   0K2
MALLOC guard page   16K   0K   0K   0K   0K 
  0K   0K5
MALLOC metadata 60K  60K  60K   0K   0K 
  0K   0K6
MALLOC_SMALL  16.0M  16K  16K   0K   0K 
  0K   0K3 see MALLOC ZONE table below
MALLOC_TINY   2048K  32K  32K   0K   0K 
  0K   0K3 see MALLOC ZONE table below
STACK GUARD   56.0M   0K   0K   0K   0K 
  0K   0K2
Stack 8192K  20K  20K   0K   0K 
  0K   0K2
__DATA2324K1192K 208K   0K   0K 
  0K   0K   43
__LINKEDIT   192.7M21.7M   0K   0K   0K 
  0K   0K4
__TEXT9448K8224K   0K   0K   0K 
  0K   0K   48
shared memory8K   8K   8K   0K   0K 
  0K   0K3
=== === =  ===    
===  ===
TOTAL286.3M31.0M 348K   0K   0K 
  0K   0K  110
...

- After calling setrlimit

...
STACK GUARD7ffee76d9000-7ffee76da000 [4K 0K 0K  
   0K] ---/rwx SM=NUL  stack guard for thread 0
...
Stack  7ffee76da000-7ffeeaed9000 [ 56.0M 0K 0K  
   0K] rw-/rwx SM=NUL  thread 0
Stack  7ffeeaed9000-7ffeeb6d9000 [ 8192K20K20K  
   0K] rw-/rwx SM=PRV  thread 0
...
VIRTUAL RESIDENTDIRTY  SWAPPED VOLATILE   
NONVOLEMPTY   REGION
REGION TYPESIZE SIZE SIZE SIZE SIZE 
SIZE SIZECOUNT (non-coalesced)
=== === =  ===    
===  ===
Kernel Alloc Once8K   4K   4K   0K   0K 
  0K   0K2
MALLOC guard page   16K   0K   0K   0K   0K 
  0K   0K5
MALLOC metadata 60K  60K  60K   0K   0K 
  0K   0K6
MALLOC_SMALL  16.0M  20K  20K   0K   0K 
  0K   0K3 see MALLOC ZONE table below
MALLOC_TINY   2048K  32K  32K   0K   0K 
  0K   0K3 see MALLOC ZONE table below
STACK GUARD  4K   0K   0K   0K   0K 
  0K   0K2
Stack 64.0M  20K  20K   0K   0K 
  0K   0K   

[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Vladimir Matveev]

Vladimir Matveev  added the comment:

I can repro it with a given sample file 
```
vladima-mbp $ cat test.c
#include 
#include 
#include 
#include 
#include 

int main() {
  struct rlimit rl;
  if(getrlimit(RLIMIT_STACK, ) < 0) {
perror("getrlimit");
exit(1);
  }

  rl.rlim_cur = rl.rlim_max;
  if(setrlimit(RLIMIT_STACK, ) < 0) {
perror("setrlimit");
exit(1);
  }
  return 0;
}vladima-mbp $ gcc   -Wl,-stack_size,100   -o test test.c
vladima-mbp $ ./test
setrlimit: Invalid argument
```
Similar settings were added to Python in 
https://github.com/python/cpython/commit/335ab5b66f4

--
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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[Ronald Oussoren]

Ronald Oussoren  added the comment:

I get the same error, also with python3.7. Both for homebrew and a python.org 
installer.

--
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nosy: +ned.deily, ronaldoussoren
versions: +Python 3.7

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[issue34602] python3 resource.setrlimit strange behaviour under macOS

[marche147]

New submission from marche147 :

Consider the following code:

```
import resource
s, h = resource.getrlimit(resource.RLIMIT_STACK)
resource.setrlimit(resource.RLIMIT_STACK, (h, h))
```

Running this under macOS with python 3.6.5 gives the following exception:

```
bash-3.2$ uname -a
Darwin arch-osx 17.7.0 Darwin Kernel Version 17.7.0: Thu Jun 21 22:53:14 PDT 
2018; root:xnu-4570.71.2~1/RELEASE_X86_64 x86_64
bash-3.2$ cat test.py
import resource
s, h = resource.getrlimit(resource.RLIMIT_STACK)
resource.setrlimit(resource.RLIMIT_STACK, (h, h))
bash-3.2$ python3 test.py
Traceback (most recent call last):
  File "test.py", line 3, in 
resource.setrlimit(resource.RLIMIT_STACK, (h, h))
ValueError: current limit exceeds maximum limit
```

Nevertheless, when using python 2.7.10 under the same environment, this code 
works perfectly without exceptions being thrown. Additionally, neither of these 
operations fail under the same circumstances :

```
bash-3.2$ cat test.c
#include 
#include 
#include 
#include 
#include 

int main() {
  struct rlimit rl;
  if(getrlimit(RLIMIT_STACK, ) < 0) {
perror("getrlimit");
exit(1);
  }

  rl.rlim_cur = rl.rlim_max;
  if(setrlimit(RLIMIT_STACK, ) < 0) {
perror("setrlimit");
exit(1);
  }
  return 0;
}
bash-3.2$ gcc -o test test.c
bash-3.2$ ./test
```

```
bash-3.2$ ulimit -s -H
65532
bash-3.2$ ulimit -s
8192
bash-3.2$ ulimit -s 65532
bash-3.2$ ulimit -s
65532
```

I have also tried to run the above-mentioned python script on linux, also it 
does not generate exceptions both on python2 (2.7.10) & python3 (3.6.5).

--
components: Library (Lib)
messages: 324731
nosy: marche147
priority: normal
severity: normal
status: open
title: python3 resource.setrlimit strange behaviour under macOS
type: behavior
versions: Python 3.6

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