# Corrupted double-linked list DifferentialEquations.jl **URL:** \ **Category:** General Usage\ **Tags:** differentialequation, dynamical-systems\ **Created:** [September 6, 2024, 11:51am UTC](https://discourse.julialang.org/t/corrupted-double-linked-list-differentialequations-jl/119120 "2024-09-06T11:51:01Z")\ **Posts on this page:** 5\ **Page:** 1

**Author:** ![mm-crj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mm-crj/32/45906_2.png) [@mm-crj](https://discourse.julialang.org/u/mm-crj)\ **Post date:** [September 6, 2024, 11:51am UTC](https://discourse.julialang.org/t/corrupted-double-linked-list-differentialequations-jl/119120/1 "2024-09-06T11:51:01Z")

I am trying to solve a large system of odes as a finite volume discretisation of the heat equation on an unstructured mesh. However, as I approach the 10-15k equations mark, by deceasing grid size the solvers start to fail. It works fine for coarser meshes. I am posting the error log below, and I will try to come up with a minimal working example ASAP. ```julia nohup: ignoring input Info : Reading 'meshes/rectangular[-5,5]unstruc/mesh5.msh'... Info : 8609 nodes Info : 17220 elements Info : Done reading 'meshes/rectangular[-5,5]unstruc/mesh5.msh' ODE 0%| | ETA: N/A ODE 0%| | ETA: 777.02 days ODE 0%| | ETA: 736.09 days ODE 0%| | ETA: 735.78 days ODE 0%| | ETA: 722.17 days ODE 0%| | ETA: 600.49 days ODE 0%| | ETA: 428.67 days ODE 0%| | ETA: 314.20 days ODE 0%| | ETA: 245.55 days ODE 0%| | ETA: 132.03 days ODE 0%| | ETA: 83.19 days ODE 0%| | ETA: 60.72 days ODE 0%| | ETA: 47.82 days ODE 0%| | ETA: 39.44 days ODE 0%| | ETA: 30.07 days ODE 0%| | ETA: 23.21 days ODE 0%| | ETA: 18.91 days ODE 0%| | ETA: 15.95 days ODE 0%| | ETA: 13.73 days ODE 0%| | ETA: 11.93 days ODE 0%| | ETA: 10.07 days ODE 0%| | ETA: 8 days, 15:12:59 ODE 0%| | ETA: 7 days, 13:20:33 ODE 0%|â | ETA: 6 days, 14:53:32 ODE 0%|â | ETA: 5 days, 21:22:51 ODE 0%|â | ETA: 5 days, 7:24:51 ODE 0%|â | ETA: 4 days, 18:50:26 ODE 0%|â | ETA: 4 days, 8:32:01 ODE 0%|â | ETA: 3 days, 22:45:27 ODE 0%|â | ETA: 3 days, 14:39:35 ODE 0%|â | ETA: 3 days, 7:57:57 ODE 0%|â | ETA: 3 days, 1:32:41 ODE 0%|â | ETA: 2 days, 19:32:03 ODE 0%|â | ETA: 2 days, 14:25:17 ODE 0%|â | ETA: 2 days, 10:03:04 ODE 0%|â | ETA: 2 days, 5:47:54 ODE 0%|â | ETA: 2 days, 1:44:40 ODE 0%|â | ETA: 1 days, 22:15:42 ODE 1%|â | ETA: 1 days, 19:12:45 ODE 1%|â | ETA: 1 days, 16:12:02 ODE 1%|â | ETA: 1 days, 13:14:38 ODE 1%|â | ETA: 1 days, 10:41:37 ODE 1%|â | ETA: 1 days, 8:26:55 ODE 1%|â | ETA: 1 days, 5:57:35 ODE 1%|â | ETA: 1 days, 3:49:45 ODE 1%|â | ETA: 1 days, 1:56:43 ODE 1%|â | ETA: 23:55:00 ODE 1%|â | ETA: 22:11:15 ODE 1%|â | ETA: 20:38:05 ODE 1%|â | ETA: 18:58:08 ODE 1%|â | ETA: 17:33:13 ODE 1%|â | ETA: 16:16:21 ODE 2%|â | ETA: 14:54:47 ODE 2%|â | ETA: 13:45:51 ODE 2%|â | ETA: 12:43:26 ODE 2%|â | ETA: 11:37:38 ODE 2%|â | ETA: 10:42:18 ODE 2%|ââ | ETA: 9:51:53 ODE 3%|ââ | ETA: 8:59:02 ODE 3%|ââ | ETA: 8:14:42 ODE 3%|ââ | ETA: 7:33:47 ODE 3%|ââ | ETA: 7:35:04 ODE 3%|ââ | ETA: 7:19:58 ODE 4%|ââ | ETA: 6:38:44 ODE 4%|ââ | ETA: 5:56:05 ODE 5%|âââ | ETA: 5:10:39 ODE 6%|âââ | ETA: 4:20:48 ODE 7%|ââââ | ETA: 3:21:47 ODE 11%|ââââââ | ETA: 2:04:42 ODE 21%|ââââââââââ | ETA: 0:59:41 ODE 46%|ââââââââââââââââââââââ | ETA: 0:19:09 ODE 100%|âââââââââââââââââââââââââââââââââââââââââââââââ| Time: 0:16:22 ODE 100%|âââââââââââââââââââââââââââââââââââââââââââââââ| Time: 0:16:27 992.100210 seconds (11.43 G allocations: 284.965 GiB, 10.36% gc time, 4.96% compilation time) error: :1:3: invalid character in input Q ^ [231233] signal (11.128): Segmentation fault in expression starting at none:0 corrupted double-linked list [231233] signal (6.-6): Aborted in expression starting at none:0 gsignal at /lib/x86_64-linux-gnu/libc.so.6 (unknown line) abort at /lib/x86_64-linux-gnu/libc.so.6 (unknown line) unknown function (ip: 0x7f5fef75926d) unknown function (ip: 0x7f5fef7612fb) unknown function (ip: 0x7f5fef76194b) unknown function (ip: 0x7f5fef762e8a) unknown function (ip: 0x7f5fef712952) exit at /lib/x86_64-linux-gnu/libc.so.6 (unknown line) _ZN4llvm11LLVMContext8diagnoseERKNS_14DiagnosticInfoE at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZNSt17_Function_handlerIFvRKN4llvm12SMDiagnosticEbRKNS0_9SourceMgrERSt6vectorIPKNS0_6MDNodeESaISA_EEEZNS0_28MachineModuleInfoWrapperPass16doInitializationERNS0_6ModuleEEUlS3_bS6_SD_E_E9_M_invokeERKSt9_Any_dataS3_ObS6_SD_ at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZN4llvm9MCContext8diagnoseERKNS_12SMDiagnosticE at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZN12_GLOBAL__N_19AsmParser11DiagHandlerERKN4llvm12SMDiagnosticEPv at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZNK4llvm9SourceMgr12PrintMessageERNS_11raw_ostreamENS_5SMLocENS0_8DiagKindERKNS_5TwineENS_8ArrayRefINS_7SMRangeEEENS8_INS_7SMFixItEEEb at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZNK4llvm9SourceMgr12PrintMessageENS_5SMLocENS0_8DiagKindERKNS_5TwineENS_8ArrayRefINS_7SMRangeEEENS6_INS_7SMFixItEEEb at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZN12_GLOBAL__N_19AsmParser3RunEbb at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZNK4llvm10AsmPrinter13emitInlineAsmENS_9StringRefERKNS_15MCSubtargetInfoERKNS_15MCTargetOptionsEPKNS_6MDNodeENS_9InlineAsm10AsmDialectE at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZNK4llvm10AsmPrinter13emitInlineAsmEPKNS_12MachineInstrE at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZN4llvm10AsmPrinter16emitFunctionBodyEv at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZN4llvm13X86AsmPrinter20runOnMachineFunctionERNS_15MachineFunctionE at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZN4llvm19MachineFunctionPass13runOnFunctionERNS_8FunctionE at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZN4llvm13FPPassManager13runOnFunctionERNS_8FunctionE at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZN4llvm13FPPassManager11runOnModuleERNS_6ModuleE at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZN4llvm6legacy15PassManagerImpl3runERNS_6ModuleE at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) _ZN4llvm3orc14SimpleCompilerclERNS_6ModuleE at /home/mainak/.local/julia-1.9.1/bin/../lib/julia/libLLVM-14jl.so (unknown line) ``` I am not sure if its a segfault as it ran out of memory. This is for `alg = QNDF()/FBDF()` at `dt =1e-8` and `abstol =1e-7, rtol = 1e-7` for about 16k equations. Even a diagonisis of the problem would be a lot of help. Thanks! ---

**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\ **Post date:** [September 6, 2024, 12:07pm UTC](https://discourse.julialang.org/t/corrupted-double-linked-list-differentialequations-jl/119120/2 "2024-09-06T12:07:26Z")

Try v1.10.5 ---

**Author:** ![mm-crj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mm-crj/32/45906_2.png) [@mm-crj](https://discourse.julialang.org/u/mm-crj)\ **Post date:** [September 6, 2024, 12:09pm UTC](https://discourse.julialang.org/t/corrupted-double-linked-list-differentialequations-jl/119120/3 "2024-09-06T12:09:37Z")

**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\ **Post date:** [September 6, 2024, 6:03pm UTC](https://discourse.julialang.org/t/corrupted-double-linked-list-differentialequations-jl/119120/4 "2024-09-06T18:03:07Z")

One of the earlier Julia patches had this GC bug, so yeah it required an update. But it’s random if you hit it because it’s a GC thing, so it’s also kind of rare, so most things would work. ---

**Author:** ![mm-crj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mm-crj/32/45906_2.png) [@mm-crj](https://discourse.julialang.org/u/mm-crj)\ **Post date:** [September 10, 2024, 9:13am UTC](https://discourse.julialang.org/t/corrupted-double-linked-list-differentialequations-jl/119120/5 "2024-09-10T09:13:20Z")

I am not so familiar with Julia Dev, so I was not aware about the GC thing. As per conventional wisdom, if things work, I usually don’t update them. So, thank you for pointing out the problem.