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kandi X-RAY | fault Summary
kandi X-RAY | fault Summary
A comprehensive collection of default CSS settings for HTML5 tags as Silent Sass Classes and Mixins. Fault is completely silent. Including fault in your project initially adds 0 bytes to your CSS payload. So if your site is slow well, that's your fault.
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QUESTION
This results in a segmentation fault when accessing unique_ptr->get_id() as release() is run beforehand.
Is the ordering not guaranteed here?
...ANSWER
Answered 2022-Apr-08 at 12:06It's actually guaranteed that this code will always fail.
According to cppreference:
- In every simple assignment expression E1=E2 and every compound assignment expression E1@=E2, every value computation and side-effect of E2 is sequenced before every value computation and side effect of E1 (since C++17)
In other words: release()
is guaranteed to be called before get_id()
in your case.
QUESTION
I try to run my React Native project on MacBook Pro M1 but when I run adb it's gives error : zsh: segmentation fault adb.
I tried run adb from both ~/Library/Android/sdk/platform-tools
& ~/usr/local/bin/adb
.
Tried reinstall platform-tools in android studio.
Tried install and reinstall platform-tools from brew.
Tried reinstall android studio itself.
Device: MacBook Pro M1 2020, SSD: 512, RAM: 8
OS: macOS Monterey
Android Studio: android-studio-2021.1.1.21-mac_arm
...ANSWER
Answered 2022-Feb-07 at 17:44This looks similar to your problem. Setting up android emulators on mac m1 pros requires extra installation steps.
QUESTION
Discussion about this was started under this answer for quite simple question.
ProblemThis simple code has unexpected overload resolution of constructor for std::basic_string
:
ANSWER
Answered 2022-Jan-05 at 12:05Maybe I'm wrong, but it seems that last part:
QUESTION
I got this issue
...ANSWER
Answered 2022-Jan-03 at 14:37Solved downgrading to the nov 2021 version of opencv
QUESTION
Following a previous question of mine, most comments say "just don't, you are in a limbo state, you have to kill everything and start over". There is also a "safeish" workaround.
What I fail to understand is why a segmentation fault is inherently nonrecoverable.
The moment in which writing to protected memory is caught - otherwise, the SIGSEGV
would not be sent.
If the moment of writing to protected memory can be caught, I don't see why - in theory - it can't be reverted, at some low level, and have the SIGSEGV converted to a standard software exception.
Please explain why after a segmentation fault the program is in an undetermined state, as very obviously, the fault is thrown before memory was actually changed (I am probably wrong and don't see why). Had it been thrown after, one could create a program that changes protected memory, one byte at a time, getting segmentation faults, and eventually reprogramming the kernel - a security risk that is not present, as we can see the world still stands.
- When exactly does a segmentation fault happen (= when is
SIGSEGV
sent)? - Why is the process in an undefined behavior state after that point?
- Why is it not recoverable?
- Why does this solution avoid that unrecoverable state? Does it even?
ANSWER
Answered 2021-Dec-10 at 15:05When exactly does segmentation fault happen (=when is SIGSEGV sent)?
When you attempt to access memory you don’t have access to, such as accessing an array out of bounds or dereferencing an invalid pointer. The signal SIGSEGV
is standardized but different OS might implement it differently. "Segmentation fault" is mainly a term used in *nix systems, Windows calls it "access violation".
Why is the process in undefined behavior state after that point?
Because one or several of the variables in the program didn’t behave as expected. Let’s say you have some array that is supposed to store a number of values, but you didn’t allocate enough room for all them. So only those you allocated room for get written correctly, and the rest written out of bounds of the array can hold any values. How exactly is the OS to know how critical those out of bounds values are for your application to function? It knows nothing of their purpose.
Furthermore, writing outside allowed memory can often corrupt other unrelated variables, which is obviously dangerous and can cause any random behavior. Such bugs are often hard to track down. Stack overflows for example are such segmentation faults prone to overwrite adjacent variables, unless the error was caught by protection mechanisms.
If we look at the behavior of "bare metal" microcontroller systems without any OS and no virtual memory features, just raw physical memory - they will just silently do exactly as told - for example, overwriting unrelated variables and keep on going. Which in turn could cause disastrous behavior in case the application is mission-critical.
Why is it not recoverable?
Because the OS doesn’t know what your program is supposed to be doing.
Though in the "bare metal" scenario above, the system might be smart enough to place itself in a safe mode and keep going. Critical applications such as automotive and med-tech aren’t allowed to just stop or reset, as that in itself might be dangerous. They will rather try to "limp home" with limited functionality.
Why does this solution avoid that unrecoverable state? Does it even?
That solution is just ignoring the error and keeps on going. It doesn’t fix the problem that caused it. It’s a very dirty patch and setjmp/longjmp in general are very dangerous functions that should be avoided for any purpose.
We have to realize that a segmentation fault is a symptom of a bug, not the cause.
QUESTION
I am trying to get a brand new cloud based server working with a default version of 20.04 server ubuntu working with apache and node. The node server appears to be running without issues reporting 4006 port is open. However I believe my apache config is not. The request will hang for a very very long time. No errors are displayed in the node terminal. So the fault must lie in my apache config seeing as we are getting the below apache errors and no JS errors.
Request error after some time ...ANSWER
Answered 2021-Oct-20 at 23:51If you use a docker for your node server, then it might be set up incorrectly
QUESTION
In short:
I have implemented a simple (multi-key) hash table with buckets (containing several elements) that exactly fit a cacheline. Inserting into a cacheline bucket is very simple, and the critical part of the main loop.
I have implemented three versions that produce the same outcome and should behave the same.
The mystery
However, I'm seeing wild performance differences by a surprisingly large factor 3, despite all versions having the exact same cacheline access pattern and resulting in identical hash table data.
The best implementation insert_ok
suffers around a factor 3 slow down compared to insert_bad
& insert_alt
on my CPU (i7-7700HQ).
One variant insert_bad is a simple modification of insert_ok
that adds an extra unnecessary linear search within the cacheline to find the position to write to (which it already knows) and does not suffer this x3 slow down.
The exact same executable shows insert_ok
a factor 1.6 faster compared to insert_bad
& insert_alt
on other CPUs (AMD 5950X (Zen 3), Intel i7-11800H (Tiger Lake)).
ANSWER
Answered 2021-Oct-25 at 22:53The TLDR is that loads which miss all levels of the TLB (and so require a page walk) and which are separated by address unknown stores can't execute in parallel, i.e., the loads are serialized and the memory level parallelism (MLP) factor is capped at 1. Effectively, the stores fence the loads, much as lfence
would.
The slow version of your insert function results in this scenario, while the other two don't (the store address is known). For large region sizes the memory access pattern dominates, and the performance is almost directly related to the MLP: the fast versions can overlap load misses and get an MLP of about 3, resulting in a 3x speedup (and the narrower reproduction case we discuss below can show more than a 10x difference on Skylake).
The underlying reason seems to be that the Skylake processor tries to maintain page-table coherence, which is not required by the specification but can work around bugs in software.
The DetailsFor those who are interested, we'll dig into the details of what's going on.
I could reproduce the problem immediately on my Skylake i7-6700HQ machine, and by stripping out extraneous parts we can reduce the original hash insert benchmark to this simple loop, which exhibits the same issue:
QUESTION
Trying to start an emulator in Android Studio gives me the following error:
The emulator process for AVD Pixel_4_API_30_-_GooglePlay has terminated.
I get the following errors logged in Android Studio logs:
...ANSWER
Answered 2021-Aug-16 at 14:41The issue was solved by updating the system packages.
In my case, it was installin the latest version of mesa-vulkan-drivers
that probably fixed the issue.
QUESTION
I'm trying to use the third argument of a SA_SIGINFO sigaction
to jump to the interrupted context directly.
Thought this:
...ANSWER
Answered 2021-Sep-19 at 03:28I think this is something that's simply not meant to work: you are only supposed to call setcontext
with a context obtained from getcontext
or makecontext
, and not with the context passed to a signal handler.
The man page hints at this obliquely:
If the context was obtained by a call to a signal handler, then old standard text says that "program execution continues with the program instruction following the instruction interrupted by the signal". However, this sentence was removed in SUSv2, and the present verdict is "the result is unspecified".
Also, the glibc source of setcontext
has a comment:
This implementation is intended to be used for synchronous context switches only. Therefore, it does not have to restore anything other than the PRESERVED state.
Indeed, it does not attempt to restore any of the floating-point registers, and it zeroes rax
(as for getcontext
returning 0). That would be pretty bad for trying to resume code that isn't expecting its registers to change spontaneously.
Asynchronous context switching would be needed for something like preemptive multitasking in userspace. I think the idea is that since pthreads is now firmly established, people should have no need for this, so it's not supported. getcontext/setcontext
date from an earlier era, and in fact have since been removed from the POSIX spec on the premise that pthreads should be used instead.
This particular crash seems to be caused by a mismatch between the kernel's layout of struct ucontext_t
, and what libc expects. In particular, libc expects the floating-point state, including the saved value of mxcsr
, at a particular offset within struct ucontext_t
. However the kernel pushes the floating point state at a separate location on the stack (which happens to overlap where libc expects it), and includes a pointer to it inside struct ucontext_t
. So libc's setcontext
attempts to load some garbage value into mxcsr
, which has some of the reserved bits 16-31 set, and this causes a general protection fault.
However, as noted above, this mismatch is the least of the problems.
QUESTION
We have a bunch of .bat
build scripts which are invoked by a PowerShell based GitLab runner that were recently refactored from:
ANSWER
Answered 2021-Feb-17 at 21:06Let's look at the three possible scenarios:
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