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e21578f662
Patched `rts` heap reservation logic on Android:
* Need for patch
- There seems to be a bug on Android. Sometimes simple commands like `ghc --help` usage 90% - 100% cpu and hangs.
- It doesn't happen every time, but ~25% of the times (at least in my
testing).
* Cause of the bug
- The function `osReserveHeapMemory` tries to allocate virtual space starting
from `0x4200000000`. The allocated space has to start at an address >= this address.
- If the kernel doesn't allocate inside this space, it keeps on repeating the
`mmap` call with increasing starting point.
- Now, on Android the kernel sometimes return an address above (as in counting)
this `hint` address. It repeatedly returns the same address for subsequent calls.
- Thus, an infinite loop occurs.
References:
- 383be28ffd/rts/posix/OSMem.c (L461)
- https://github.com/termux/termux-packages/pull/22991#issuecomment-2759137291
* Solution (proposed by Robert Kirkman):
- It introduces a new helper function `osTryReserveHeapMemoryRecursive`.
This transforms the heap reservation logic into a recursive one.
- `osTryReserveHeapMemory()` is run multiple times without unmapping the
undesired addresses. Thus, forcing the kernel to map subsequent calls of
`mmap` to a new, unique address until an address above the `0x4200000000`
mark is obtained.
- After which each recursive call unmaps its undesired address before returning
the desired address (in order from last mapped to first mapped).
References:
- https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14164
- https://github.com/termux/termux-packages/pull/22991#issuecomment-2761325484
Co-authored-by: Robert Kirkman <rkirkman@termux.dev>
Signed-off-by: Aditya Alok <alok@termux.dev>
13 lines
583 B
Diff
13 lines
583 B
Diff
--- ghc-9.12.2/hadrian/src/Rules/Program.hs 2025-03-29 15:32:47.000000000 +0530
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+++ ghc-9.12.2.mod/hadrian/src/Rules/Program.hs 2025-04-07 23:55:57.642949426 +0530
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@@ -102,9 +102,6 @@
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cross <- flag CrossCompiling
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-- For cross compiler, copy @stage0/bin/<pgm>@ to @stage1/bin/@.
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case (cross, stage) of
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- (True, s) | s > stage0InTree -> do
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- srcDir <- buildRoot <&> (-/- (stageString stage0InTree -/- "bin"))
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- copyFile (srcDir -/- takeFileName bin) bin
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_ -> buildBinary rs bin ctx
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buildBinary :: [(Resource, Int)] -> FilePath -> Context -> Action ()
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