There have been changes to upstream that likely fixes this.
See https://gitlab.haskell.org/ghc/ghc/-/issues/25492
If you can reproduce this issue using a ghc build base of a recent ghc
master version please let us know!
Cheers
On 27/05/2025 20:35, Heinrich Schuchardt via ghc-devs wrote:
The following bug related to the Haskell runtime was reported in
Launchpad:
Haskell's default behaviour of using large-address-space is causing
pandoc to stuck in an infinite loop on QEMU 10 Edit
https://bugs.launchpad.net/ubuntu/+source/ghc/+bug/2111581
The problem seems to relate to the following loop in
osReserveHeapMemory():
https://gitlab.haskell.org/ghc/ghc/-/blob/master/rts/posix/OSMem.c?ref_type=heads#L589
According to the mmap() manpage the address passed to the kernel in
only a hint there is no guarantee that the same address will be used
for allocation.
As shown in the strace logs attached in Launchpad this code can lead
to an endless loop when the kernel decides always to return an address
below 8 GiB.
It might make sense to round up the address to 8 GiB if the returned
address is below 8 GiB and reduce *len accordingly instead of retrying.
Best regards
Heinrich
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