filter_rust example has memory issues when large events (~10kb) are passed

[rbi]

minimal_filter.zip

Bug Report

Describe the bug
There seem to be very strict memory limits for Rust/WASM filters which are hit easily when a bit bigger than normal event (~10kb) is passed to the filter.
It can be reproduced with the examples/filter_rust and the examples/filter_rust_clib examples.
I tried to add some zeros to the values -z stack-size, --initial-memory and --max-memory in the examples/filter_rust_clib example but it didn't made the problem go away.
I could also reproduce it with an even more minimalist filter with no additional dependencies which I attached to this issue.
The only difference is that the minimalistic filter fails with:

[05:45:30:117 - 7F299C7FF700]: warning: allocate 10252 bytes memory failed

while the examples/filter_rust filter fails with:

[error] Got exception running wasm code: Exception: unreachable

To Reproduce

• Throw the following log message on the examples/filter_rust filter.

{"log": "abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz1234564abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdef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opqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456"}

• or do the same with the minimal filter attached to the ticket. The minimal filter is just.

use std::os::raw::c_char;
use std::slice;

#[no_mangle]
pub extern "C" fn minimal_filter( _tag: *const c_char,_tag_len: u32,_time_sec: u32,  _time_nsec: u32,record: *const c_char, record_len: u32,) -> *const u8 {
    format!("{{\"bytes\": {} }}", record_len).as_ptr()
}

Expected behavior

• It should work with no warning or error messages

Actual behavior

• with the examples/filter_rust filter

[2023/11/10 17:35:22] [error] Got exception running wasm code: Exception: unreachable

• with the minimal_filter

[05:45:30:117 - 7F299C7FF700]: warning: allocate 10252 bytes memory failed

Your Environment

• Version used: 2.1.10 (Docker Image cr.fluentbit.io/fluent/fluent-bit:2.1.10)
• Configuration:

[SERVICE]
    daemon       Off
    log_level    info

[INPUT]
    Name dummy
    Dummy {"log": "abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz1234564abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456abcdef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    Tag log.*

[FILTER]
    Name wasm
    Match log.*
    WASM_Path /filter_rust.wasm
    Function_Name rust_filter
    accessible_paths .
    
# [FILTER]
#     Name wasm
#     Match log.*
#     WASM_Path /minimal_filter.wasm
#     Function_Name minimal_filter
#     accessible_paths .

[OUTPUT]
    name stdout
    match log.*

• Environment name and version (e.g. Kubernetes? What version?):

Docker Compose version 2.20.2+ds1-0ubuntu1~22.04.1
Docker version 24.0.5, build 24.0.5-0ubuntu1~22.04.1

• Server type and version:
• Operating System and version:

uname -a gives

Linux 5.15.0-88-generic #98-Ubuntu SMP Mon Oct 2 15:18:56 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

• Filters and plugins:
  just dummy > wasm > stdout

• Rust Version

$ rustup -V
rustup 1.26.0 (5af9b9484 2023-04-05)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.73.0 (cc66ad468 2023-10-03)`

Additional context
The actual problem that I have is that when I add the minimal example to my near productive pipeline it logs warning: allocate x bytes memory failed message in a rate that almost crashes my IDE when tailing it live and not aborting it quick enough.
The example in this ticket tries to reproduce the issue.

Edit The log messages in my near prod pipeline look like this:

[12:42:50:784 - 7FE6395FF700]: warning: allocate 129 bytes memory failed
[12:42:50:798 - 7FE6395FF700]: warning: allocate 886 bytes memory failed
[12:42:50:841 - 7FE6395FF700]: warning: allocate 129 bytes memory failed
[12:42:50:843 - 7FE6395FF700]: warning: allocate 887 bytes memory failed
[12:42:50:884 - 7FE6395FF700]: warning: allocate 129 bytes memory failed
[...]

I get thousands of these just for the one second 12:42:50. The number of bytes that are tried to be allocated are rather small.

[rbi]

I think the problem is this line in flb_wasm.c

uint32_t buf_size, stack_size = 8 * 1024, heap_size = 8 * 1024;

Just 8kb of heap_size for web assembly filters. I raised it to 16 MB and my filter began to work¹.

Maybe I just didn't find the right way to raise this limit in my own wasm file. Or maybe this really is a hard coded limit of 8kb that can not be overwritten from the wasm file. If so, wouldn't that severely limit the usefulness of the whole web assembly filter support of fluent-bit?

¹ I also have the stack size set to 1 MB in my current setup but I think an earlier version of the filter I'm curently developing only needed the heap_size raised to start working.

[github-actions]

This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 5 days. Maintainers can add the exempt-stale label.

[rbi]

Please unstale. In my opinion this issue renders the whole custom Rust filter feature useless for real world use cases. It shouldn't be hard to fix the issue.

[github-actions]

This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 5 days. Maintainers can add the exempt-stale label.

[rbi]

still broken

[github-actions]

This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 5 days. Maintainers can add the exempt-stale label.

[rbi]

please unstale