I am new for libFuzzer. Right now, I use it to find the potential bug in one library (myLibrary.a). So, I write test_fuzz.cpp file which calls the function LLVMFuzzerTestOneInput().
I compile test_fuzz.cpp with clang++ flags " -fsanitize=address -fsanitize-coverage=trace-pc-guard -g -o2", and linked with libFuzzer.a myLibrary.a to create the executable App.
The myLibrary.a is pre-built with same compiler flags (clang++).
Run the App, it did hit the heap-use-after-free. But, it reported as below. My question is, why it can only reports offset instead of detailed location (like function name, file name and line number)? The myLibrary.a contents many files which locates in different folders(modules), it is not possible to list all the files one by one and build with test.cpp.
It is hard for me to use offset to figure out which part of codes have bug. Anything I miss here? Thanks for any helps.
==18728==ERROR: AddressSanitizer: heap-use-after-free on address 0x60f0000000c0 at pc 0x00000127884c bp 0x7f7db9decd70 sp 0x7f7db9decd68
READ of size 8 at 0x60f0000000c0 thread T8
#0 0x127884b (/home/workspace/test_fuzz+0x127884b)
#1 0x127aad5 (/home/workspace/test_fuzz+0x127aad5)
#2 0x127acd2 (/home/workspace/test_fuzz+0x127acd2)
#3 0x127e591 (/home/workspace/test_fuzz+0x127e591)
#4 0x12633ac (/home/workspace/test_fuzz+0x12633ac)
#5 0x121efee (/home/workspace/test_fuzz+0x121efee)
Related
I'm relatively new to using Octave. I'm working on a project that requires me to collect the RGB values of all the pixels in a particular image and compare them to a list of other values. This is a time-consuming process that takes about half a minute to run. As I make edits to my code and test it, I find it annoying that I need to wait for 30 seconds to see if my updates work or not. Is there a way where I can run the code once at first to load the data I need and then set up an artificial starting point so that when I rerun the code (or input something into the command window) it only runs a desired section (the section after the time-consuming part) leaving the untouched data intact?
You may set your variable to save into a global variable,
and then use clear -v instead of clear all.
clear all is a kind of atomic bomb, loved by many users. I have never understood why. Hopefully, it does not close the session: Still some job for quit() ;-)
To illustrate the proposed solution:
>> a = rand(1,3)
a =
0.776777 0.042049 0.221082
>> global a
>> clear -v
>> a
error: 'a' undefined near line 1, column 1
>> global a
>> a
a =
0.776777 0.042049 0.221082
Octave works in an interactive session. If you run your script in a new Octave session each time, you will have to re-compute all your values each time. But you can also start Octave and then run your script at the interactive terminal. At the end of the script, the workspace will contain all the variables your script used. You can type individual statements at the interactive terminal prompt, which use and modify these variables, just like running a script one line at the time.
You can also set breakpoints. You can set a breakpoint at any point in your script, then run your script. The script will run until the breakpoint, then the interactive terminal will become active and you can work with the variables as they are at that point.
If you don't like the interactive stuff, you can also write a script this way:
clear
if 1
% Section 1
% ... do some computations here
save my_data
else
load my_data
end
% Section 2
% ... do some more computations here
When you run the script, Section 1 will be run, and the results saved to file. Now change the 1 to 0, and then run the script again. This time, Section 1 will be skipped, and the previously saved variables will be loaded.
I am trying to load multiple csv files into a new db using the neo4j-admin import tool on a machine running Debian 11. To try to ensure there's no collisions in the ID fields, I've given every one of my node and relationship files.
However, I'm getting this error:
org.neo4j.internal.batchimport.input.HeaderException: Group 'INVS' not found. Available groups are: [CUST]
This is super frustrating, as I know that the INV group definitely exists. I've checked every file that uses that ID Space and they all include it.Another strange thing is that there are more ID spaces than just the CUST and INV ones. It feels like it's trying to load in relationships before it finishes loading in all of the nodes for some reason.
Here is what I'm seeing when I search through my input files
$ grep -r -h "(INV" ./import | sort | uniq
:ID(INVS),total,:LABEL
:START_ID(INVS),:END_ID(CUST),:TYPE
:START_ID(INVS),:END_ID(ITEM),:TYPE
The top one is from my $NEO4J_HOME/import/nodes folder, the other two are in my $NEO4J_HOME/import/relationships folder.
Is there a nice solution to this? Or have I just stumbled upon a bug here?
Edit: here's the command I've been using from within my $NEO4J_HOME directory:
neo4j-admin import --force=true --high-io=true --skip-duplicate-nodes --nodes=import/nodes/\.* --relationships=import/relationships/\.*
Indeed, such a thing would be great, but i don't think it's possible at the moment.
Anyway it doesn't seems a bug.
I suppose it may be a wanted behavior and / or a feature not yet foreseen.
In fact, on the documentation regarding the regular expression it says:
Assume that you want to include a header and then multiple files that matches a pattern, e.g. containing numbers.
In this case a regular expression can be used
while on the description of --nodes command:
Node CSV header and data. Multiple files will be
logically seen as one big file from the
perspective of the importer. The first line must
contain the header. Multiple data sources like
these can be specified in one import, where each
data source has its own header.
So, it appears that the neo4j-admin import considers the --nodes=import/nodes/\.* as a single .csv with the first header found, hence the error.
Contrariwise with more --nodes there are no problems.
I just started using GNU Radio, I must say I am quite a noob but I have some background on RF related stuff.
Here's the thing:
I recorded a file that I now want to repeat through my HackRF and GNU Radio.
This is the exact settings for the filter:
The settings you see are casual (since I cannot get it working I started testing with random values).
This is the error I get:
Executing: /usr/bin/python3 -u /home/scare/LAB/RadioFrequencies/GNU Radio/reply_433.py
gr-osmosdr 0.2.0.0 (0.2.0) gnuradio 3.8.2.0
built-in sink types: uhd hackrf bladerf soapy redpitaya file
[INFO] [UHD] linux; GNU C++ version 11.1.0; Boost_107600; UHD_4.0.0.0-0-unknown
Using HackRF One with firmware 2017.02.1
Traceback (most recent call last):
File "/home/scare/LAB/RadioFrequencies/GNU Radio/reply_433.py", line 211, in <module>
main()
File "/home/scare/LAB/RadioFrequencies/GNU Radio/reply_433.py", line 187, in main
tb = top_block_cls()
File "/home/scare/LAB/RadioFrequencies/GNU Radio/reply_433.py", line 137, in __init__
firdes.high_pass(
File "/usr/lib/python3.9/site-packages/gnuradio/filter/filter_swig.py", line 124, in high_pass
return _filter_swig.firdes_high_pass(*args, **kwargs)
RuntimeError: firdes check failed: 0 < fa <= sampling_freq / 2
Done (return code 1)
Where obviously the interesting part is the RuntimeError: firdes check failed: 0 < fa <= sampling_freq / 2
Unfortunately, I don't get what that 'fa' stands for.
Any idea?
Cheers
I just got done solving this same error. The error is caused by a filter's Cut-off and transition parameters being set incorrectly (in my case far too large). GNU radio handles the variable 'samp_rate' differently for each block and filters seem to interpret it was a point to center the filter on (that's my take on it so don't quote me).
I also looked in the source code and can't find anything helpful on 'fa'
So try adjusting your cutoff to be something below samp_rate and make your transition width something to the tune of 250e3. I used GUI sliders to set the filter how I liked and I will make these permanent in the final version.
Screen Cap of Settings Here
Slider Settings For Both Sliders
Mike Ossmann's "SDR with HackRF One, Lesson 10 - Filters helped" me out here. Also just a great SDR lecture series for GNU radio if you haven't come across them yet. (just make sure to use the QT GUI).
I hope this helped. I am pretty new to GNU so sorry if the explanation is a little half-baked.
fa is the cutoff_frequency in the function that is throwing the error message. The cutoff frequency has to be greater than 0 and no more than the Nyquist limit. There are some functions called sanity_check_xxx (xxx being whether one cutoff or 2, i.e. bandpass, and optionally c for complex) around line 750 in gr_filter/lib/firdes.cc in the GNU Radio repository on GitHub.
In the question the samp_rate would need to be at least 800MHz to support a high pass cutoff of 400Mhz. As far as I can tell sample rate is used the same way in these filter functions as anywhere else in GNU Radio.
I ran into the same error message because I used 'firdes.band_passinstead offirdes.complex_band_pass` and the low cutoff was negative, which it should be for the complex band pass filter.
I have the output of recursive grep (actually ag) in a buffer, which is of the form filename:linenumber: ... [match] ..., and I want to be able to go to the occurrence (file and line number) currently under the cursor. This told me that I could execute normal-mode movements, so after extracting the file:line portion, I wrote this function:
function OpenFileNewTab(name)
let l:pair=split(a:name, ":")
execute "tabnew" get(l:pair, 0)
execute "normal!" get(l:pair, 1) . "G"
endfunction
It is supposed to open the specified file in a tab and then do <lineno>G, like I am able to do manually, to go to the specified line number. However, the cursor just stays on line 1. What am I doing wrong?
This question, by title alone, would be an exact duplicate, but it talks locating symbols in other files, while I already have the locations at hand.
Edit: My mappings for grep / ag are as follows:
nnoremap <Leader>ag :execute "new \| read !ag --literal -w" "<C-r><C-w>" g:repo \| :set filetype=c<CR>
nnoremap <Leader>gf ^v2t:"zy :execute OpenFileNewTab("<C-r>z")<CR>
To get my grep / ag results, I put the cursor on the word I want to search and enter <leader>ag, then, in the new buffer, I put the cursor on a line and enter <leader>gf - it selects from the start up to the second colon and calls OpenFileNewTab.
Edit 2: I'm on Cygwin, if it is of any importance - I doubt it.
Why don't you set &grepprg to call ag ?
" according to man ag
set grepprg=ag\ --vimgrep\ $*
set grepformat=%f:%l:%c:%m
" And then (not tested)
nnoremap <Leader>ag :grep -w <c-r><c-w><cr>
As others have said in the comments, you are just trying to emulate what the quickfix windows already provides. And, we are lucky vim can call grep, and it has a variation point to let us specify which grep program we wish to use: 'grepprg'.
Use file-line plugin. Pressing Enter on a line in the quicklist will normally open that file; file-line will make any filename of the form file:line:column (and several other formats) to open file and position to line and column.
I only found this (old) thread after I posted the exact same question on vi.stackexchange: https://vi.stackexchange.com/q/39557/44764. To help anyone who comes looking, I post the best answer to my question below as an alternative to the answers already given.
The gF command, like gf, opens the file in a new tab but additionally it also positions the cursor on the line after the colon. (I note the OP defines <leader>gf so maybe vim/neovim didn't auto-define gf or gF at the time this thread was originally created.)
it seems that it is not possible for me to trigger an event in OpenNMS using a threshold...
first the fact (as much detail as i can)
i want to monitor a html file, better, the content.
if a value is not what i expected OpenNMS should call be.
my html file:
Document Count: 5
in /var/lib/opennms/rrd/snmp/NODE are two files named: "documentCount" (.jbr & .meta)
--> because of the http-datacollection-config.xml
in my logfiles is written:
INFO [LegacyScheduler-Thread-2-of-50] RrdUtils: updateRRD: updating RRD file /var/lib/opennms/rrd/snmp/21/documentCount.jrb with values '1385031023:5'"
so the "5" is collected correctly.
now i created a threshold for this case:
<threshold type="high" ds-type="node"
value="4.0" rearm="2.0" trigger="1" triggeredUEI="uei.opennms.org/threshold/highThresholdExceeded"
filterOperator="or" ds-name="documentCount"
/>
in my collectd-configuration.xml is the threshold also enabled:
in my opinion the threshold of 4 is exceeded, because the value is 5. so the highTresholdEvent should be fired. BUT IT DOESNT.
so i'm here to ask if someone had an idea.
regards dawn
Check collectd.log with the following
tail -f collectd.log | grep -i thresholding
Threshold checking was moved to evaluate while the data is being retrieved a while back as opposed to a post process of rrd files.
Even with the log setting at info you should find some clues as to why the threshold rule is not matching any data.