8000 [erlc] internal consistency check failed: "bad_arg_type" · Issue #6602 · erlang/otp · GitHub
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[erlc] internal consistency check failed: "bad_arg_type" #6602
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RobinMorisset opened this issue Dec 30, 2022 · 1 comment · Fixed by #6621
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[erlc] internal consistency check failed: "bad_arg_type" #6602

RobinMorisset opened this issue Dec 30, 2022 · 1 comment · Fixed by #6621
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@bjorng @jhogberg
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bug Issue is reported as a bug team:VM Assigned to OTP team VM

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@RobinMorisset
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On master,

f(<<X:((ok > {<<(true andalso ok)>>}) orelse 1)>>) ->
    try
        f0()
    after
        -(X + f1(not ok)),
        try
            ok
        catch
            _ ->
                ok;
            _ ->
                ok;
            _ ->
                ok;
            _ ->
                ok;
            _ ->
                ok;
            _ ->
                ok
        end
    end.

f0() ->
    ok.

f1(_) ->
    ok.

crashes erlc with the following error message:

bad_arg_type:1: function f/1+30:
  Internal consistency check failed - please report this bug.
  Instruction: {call_last,1,{f,18},2}
  Error:       {bad_arg_type,{x,0},{t_integer,any},{t_integer,{0,1}}}:

Interestingly, all 6 of the seemingly redundant branches in the catch are required for the bug to reproduce.
@RobinMorisset RobinMorisset added the bug Issue is reported as a bug label Dec 30, 2022
@rickard-green rickard-green added the team:VM Assigned to OTP team VM label Jan 2, 2023
@RobinMorisset
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An alternate testcase for the same bug:

f() ->
    [
        ok
     || <<X:(is_number(<<(<<(0 bxor 0)>>)>>) orelse 1)>> <= <<>>,
        #{X := _} <- ok
    ].
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@jhogberg jhogberg mentioned this issue Jan 2, 2023
Merged
jhogberg added a commit that referenced this issue Jan 3, 2023
@jhogberg
Merge pull request #6621 from jhogberg/john/compiler/validator-bs_get…
3f24baa 
…-none/GH-6602

beam_validator: Bail on impossible sizes in bs_get_integer
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@bjorng bjorng

@jhogberg jhogberg

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bug Issue is reported as a bug team:VM Assigned to OTP team VM
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beam_validator: Bail on impossible sizes in bs_get_integer jhogberg/otp
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@bjorng @rickard-green @RobinMorisset @jhogberg
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