Aarch64 build is broken

Trying to bootstrap 7446c7f6 on an aarch64 (Debian 8, LLVM 5) box results in a reproducibly segfaulting ghc-stage2,

(gdb) run
Starting program: /mnt/ext/arm/ghc/inplace/lib/bin/ghc-stage2 -B/mnt/ext/arm/ghc/inplace/lib -hisuf dyn_hi -osuf dyn_o -hcsuf dyn_hc -fPIC -dynamic -H32m -O -Wall -hide-all-packages -i -iutils/check-ppr/. -iutils/check-ppr/dist-install/build -Iutils/check-ppr/dist-install/build -iutils/check-ppr/dist-install/build/check-ppr/autogen -Iutils/check-ppr/dist-install/build/check-ppr/autogen -optP-include -optPutils/check-ppr/dist-install/build/check-ppr/autogen/cabal_macros.h -package-id base-4.11.0.0 -package-id bytestring-0.10.8.2 -package-id containers-0.5.10.2 -package-id Cabal-2.0.0.2 -package-id directory-1.3.1.2 -package-id
filepath-1.4.1.2 -package-id ghc-8.3 -Wall -XHaskell2010 -no-user-package-db -rtsopts -Wnoncanonical-monad-instances -odir utils/check-ppr/dist-install/build -hidir utils/check-ppr/dist-install/build -stubdir utils/check-ppr/dist-install/build -c utils/check-ppr/./Main.hs -o utils/check-ppr/dist-install/build/Main.dyn_o
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
[New Thread 0x3fafaff200 (LWP 29429)]

Thread 1 "ghc-stage2" received signal SIGSEGV, Segmentation fault.
0x00000000005aa360 in stg_IND_STATIC_info ()
(gdb) bt
#0  0x00000000005aa360 in stg_IND_STATIC_info ()
#1  0x0000007fb11b3450 in ccib_info$def () from /mnt/ext/arm/ghc/libraries/base/dist-install/build/libHSbase-4.11.0.0-ghc8.3.20170926.so
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)

Trac metadata

Trac field	Value
Version	8.2.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	angerman
Operating system
Architecture