alloc_adjustor_chunk: failed to allocate on Windows

I don't have a program that reliably reproduces the issue, but in a UI application that makes extensive use of gi-gtk (and thus of foreign import "wrapper" for callbacks), I non-deterministically run into the following error:

internal error: alloc_adjustor_chunk: failed to allocate
    (GHC version 9.10.1 for x86_64_unknown_mingw32)
    Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug

GHC versions used: any
OS: Windows

added Pnormal RTS Tbug Windows runtime crash labels

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We should do a few things here:

• Introduce error output to allocateLocalBytes
• Perhaps lift the requirement that adjustor pages live proximate to the image code

added FFI label

mentioned in commit c9b8eae2

mentioned in merge request !13622 (closed)

mentioned in commit 81861b88

I have opened !13622 (closed) lifting the locality requirement for pages allocated for adjustors. Hopefully this will reduce the susceptibility of adjustor allocation to fragmentation-related failures.

However, it is in general suspicious that even a long-lived program would allocate enough adjustors to sufficiently fragment address space such that allocation fails. To better understand what is going on here, I have opened !13623 to track how many adjustors are currently allocated. I suggest that we report this on major GC via the eventlog, making it easier to verify that adjustors aren't leaking.

Do note that it is not necessarily long-running programs that trigger this bug. Sometimes I run into this bug immediately when I begin running my program. To me that doesn't indicate problems with leaking, but perhaps problems relating to where the code is located?

assigned to @bgamari

removed info needed label

mentioned in commit 04320b03

mentioned in commit 5086c56a

mentioned in commit 3a7021cb

mentioned in commit a104508d

Closed via !13622 (closed).

closed

mentioned in commit 051d8a37

mentioned in commit d8a682a9

mentioned in commit 660ad907