GHCi segfaults with +RTS -Di after hitting a breakpoint

Steps to reproduce:

• Compile stage2 with -debug
• Run GHCi with +RTS -Di
• Load an interpreted module with a definition, set a breakpoint on the definition
• Evaluate the definition

GHCi crashes with a segfault. Backtrace:

#0  0x00007ffff18bcaa9 in disInstr (bco=0x4200013f30, pc=1) at rts/Disassembler.c:71
#1  0x00007ffff18c89e9 in interpretBCO (cap=0x7ffff19431c0 <MainCapability>) at rts/Interpreter.c:986
#2  0x00007ffff18d19fe in schedule (initialCapability=0x7ffff19431c0 <MainCapability>, task=0x7fffe0000910) at rts/Schedule.c:471
#3  0x00007ffff18d4ee2 in scheduleWorker (cap=0x7ffff19431c0 <MainCapability>, task=0x7fffe0000910) at rts/Schedule.c:2553
#4  0x00007ffff18ccab8 in workerStart (task=0x7fffe0000910) at rts/Task.c:444
#5  0x00007ffff0c3c6ba in start_thread (arg=0x7fffee9aa700) at pthread_create.c:333
#6  0x00007ffff06f241d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

in this line:

71          debugBelch(" %s\n", ((CostCentre*)(literals[instrs[pc+3]]))->label);

literals[instrs[pc+3]] is null.

Trac metadata

Trac field	Value
Version	8.5
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
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