Stuck when compiling RISC-V

[RossComputerGuy]

Found in Zig ziglang/zig#18872 with LLVM 17.

LLVM gets stuck in AttemptToFoldSymbolOffsetDifference for forever. The longest I've ran a build for is 14 hours on an Apple M1 Pro generating for riscv64-linux baseline.

#0  AttemptToFoldSymbolOffsetDifference (Asm=0x1fd10c10, Layout=0x7ffffffe3570, Addrs=0x0, InSet=true, A=@0x7ffffffe2d88: 0xff381058, B=@0x7ffffffe2d80: 0x0, Addend=@0x7ffffffe2d78: 0) at /home/ross/zig-bootstrap/llvm/lib/MC/MCExpr.cpp:596
#1  0x000000000c3a2bb8 in EvaluateSymbolicAdd (Asm=0x1fd10c10, Layout=0x7ffffffe3570, Addrs=0x0, InSet=true, LHS=..., RHS_A=0x0, RHS_B=0xff381070, RHS_Cst=0, Res=...) at /home/ross/zig-bootstrap/llvm/lib/MC/MCExpr.cpp:775
#2  0x000000000c3a399f in llvm::MCExpr::evaluateAsRelocatableImpl (this=0xff381088, Res=..., Asm=0x1fd10c10, Layout=0x7ffffffe3570, Fixup=0x0, Addrs=0x0, InSet=true) at /home/ross/zig-bootstrap/llvm/lib/MC/MCExpr.cpp:965
#3  0x000000000c3a2164 in llvm::MCExpr::evaluateAsAbsolute (this=0xff381088, Res=@0x7ffffffe3178: 4298713344, Asm=0x1fd10c10, Layout=0x7ffffffe3570, Addrs=0x0, InSet=true) at /home/ross/zig-bootstrap/llvm/lib/MC/MCExpr.cpp:583
#4  0x000000000c3a20c1 in llvm::MCExpr::evaluateKnownAbsolute (this=0xff381088, Res=@0x7ffffffe3178: 4298713344, Layout=...) at /home/ross/zig-bootstrap/llvm/lib/MC/MCExpr.cpp:567
#5  0x000000000c350d27 in llvm::MCAssembler::relaxDwarfLineAddr (this=0x1fd10c10, Layout=..., DF=...) at /home/ross/zig-bootstrap/llvm/lib/MC/MCAssembler.cpp:1099
#6  0x000000000c3512a1 in llvm::MCAssembler::relaxFragment (this=0x1fd10c10, Layout=..., F=...) at /home/ross/zig-bootstrap/llvm/lib/MC/MCAssembler.cpp:1178
#7  0x000000000c3513f3 in llvm::MCAssembler::layoutSectionOnce (this=0x1fd10c10, Layout=..., Sec=...) at /home/ross/zig-bootstrap/llvm/lib/MC/MCAssembler.cpp:1205
#8  0x000000000c3514d0 in llvm::MCAssembler::layoutOnce (this=0x1fd10c10, Layout=...) at /home/ross/zig-bootstrap/llvm/lib/MC/MCAssembler.cpp:1221
#9  0x000000000c34fc07 in llvm::MCAssembler::layout (this=0x1fd10c10, Layout=...) at /home/ross/zig-bootstrap/llvm/lib/MC/MCAssembler.cpp:843
#10 0x000000000c3504a8 in llvm::MCAssembler::Finish (this=0x1fd10c10) at /home/ross/zig-bootstrap/llvm/lib/MC/MCAssembler.cpp:944
#11 0x000000000c3c495e in llvm::MCObjectStreamer::finishImpl (this=0x176d3240) at /home/ross/zig-bootstrap/llvm/lib/MC/MCObjectStreamer.cpp:932
#12 0x000000000c397dba in llvm::MCELFStreamer::finishImpl (this=0x176d3240) at /home/ross/zig-bootstrap/llvm/lib/MC/MCELFStreamer.cpp:721
#13 0x000000000c3e9dee in llvm::MCStreamer::finish (this=0x176d3240, EndLoc=...) at /home/ross/zig-bootstrap/llvm/lib/MC/MCStreamer.cpp:1021
#14 0x000000000a60ce05 in llvm::AsmPrinter::doFinalization (this=0x1740d7b0, M=...) at /home/ross/zig-bootstrap/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp:2396
#15 0x000000000c76afad in llvm::FPPassManager::doFinalization (this=0x389ef1f0, M=...) at /home/ross/zig-bootstrap/llvm/lib/IR/LegacyPassManager.cpp:1499
#16 0x000000000c76b552 in (anonymous namespace)::MPPassManager::runOnModule (this=0x9326ed40, M=...) at /home/ross/zig-bootstrap/llvm/lib/IR/LegacyPassManager.cpp:1586
#17 0x000000000c766518 in llvm::legacy::PassManagerImpl::run (this=0x742575c0, M=...) at /home/ross/zig-bootstrap/llvm/lib/IR/LegacyPassManager.cpp:535
#18 0x000000000c76baed in llvm::legacy::PassManager::run (this=0x7ffffffe4160, M=...) at /home/ross/zig-bootstrap/llvm/lib/IR/LegacyPassManager.cpp:1677
#19 0x000000000292a368 in ZigLLVMTargetMachineEmitToFile (targ_machine_ref=0x17058820, module_ref=0x17050ee0, error_message=0x7ffffffe5da8, is_debug=true, is_small=false, time_report=false, tsan=false, lto=false, asm_filename=0x0, bin_filename=0x9348ace3 "zig.o", llvm_ir_filename=0x0, bitcode_filename=0x0)
    at /home/ross/zig-bootstrap/zig/src/zig_llvm.cpp:357
#20 0x00000000004a10bf in codegen_llvm_Object_emit__13929 (a0=0x7fffeb9994e8, a1=...) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:368532
#21 0x00000000004a1a7d in Compilation_emitLlvmObject__5131 (a0=0x7fffeb997ce0, a1=..., a2=..., a3=..., a4=0x7fffeb9994e8, a5=0x7ffffffebfe0) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:368669
#22 0x0000000000bdeed2 in link_File_emitLlvmObject__4801 (a0=..., a1=..., a2=0x7fffeb9994e8, a3=0x7ffffffebfe0) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:987633
#23 0x0000000000c71e80 in link_Elf_flushModule__4835 (a0=0x7fffeb998da8, a1=..., a2=0x7ffffffebfe0) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:1030814
#24 0x00000000008b7015 in link_Elf_linkWithLLD__4855 (a0=0x7fffeb998da8, a1=..., a2=0x7ffffffebfe0) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:703231
#25 0x00000000008d0f00 in link_Elf_flush__4834 (a0=0x7fffeb998da8, a1=..., a2=0x7ffffffebfe0) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:707770
#26 0x000000000064eb70 in link_File_flush__4777 (a0=0x7fffeb998da8, a1=..., a2=0x7ffffffebfe0) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:494132
#27 0x00000000004a1ba5 in Compilation_flush__5123 (a0=0x7fffeb997ce0, a1=..., a2=0x7ffffffebfe0) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:368732
#28 0x00000000004a7ab3 in Compilation_update__5122 (a0=0x7fffeb997ce0, a1=0x7ffffffebfe0) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:370261
#29 0x00000000004d3e4d in main_updateModule__216 (a0=0x7fffeb997ce0, a1=0 '\000') at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:379451
#30 0x0000000000502897 in main_buildOutputType__206 (a0=..., a1=..., a2=..., a3=...) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:390743
#31 0x000000000050e6db in main_mainArgs__194 (a0=..., a1=..., a2=...) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:394280
#32 0x00000000004257a9 in main_main__192 () at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:330827
#33 0x00000000004242aa in main (a0=318, a1=0x7fffffff46f8, a2=0x7fffffff50f0) at /home/ross/zig-bootstrap/out/build-zig-host/zig2.c:330446

[EugeneZelenko]

Could you please try 18 or main branch?

[RossComputerGuy]

Will have to do the LLVM upgrade process unless you know of any easy way to reproduce this outside of Zig.

[dtcxzyw]

@RossComputerGuy Could you please provide the LLVM IR?

[RossComputerGuy]

I'm having trouble sending the IR since it's 608MB.

[RossComputerGuy]

https://termbin.com/2oij ok, i think this should do.

[alexrp]

I believe b06e736 fixed this.