Deno: thread 'main' panicked at 'already borrowed: BorrowMutError'

Created on 2 Jun 2020  路  18Comments  路  Source: denoland/deno

Received this error. For some additional info, I am only using the std/path module and some function from the Deno global.

thread 'main' panicked at 'already borrowed: BorrowMutError', /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libcore/cell.rs:878:9
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.44/src/backtrace/libunwind.rs:86
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.44/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:78
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:59
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1063
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1426
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:62
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:204
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:224
  10: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:470
  11: rust_begin_unwind
             at src/libstd/panicking.rs:378
  12: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  13: core::option::expect_none_failed
             at src/libcore/option.rs:1211
  14: deno_core::bindings::send
  15: <extern "C" fn(A0) .> R as rusty_v8::support::CFnFrom<F>>::mapping::c_fn
  16: _ZN2v88internal25FunctionCallbackArguments4CallENS0_15CallHandlerInfoE
  17: _ZN2v88internal12_GLOBAL__N_119HandleApiCallHelperILb0EEENS0_11MaybeHandleINS0_6ObjectEEEPNS0_7IsolateENS0_6HandleINS0_10HeapObjectEEESA_NS8_INS0_20FunctionTemplateInfoEEENS8_IS4_EENS0_16BuiltinArgumentsE
  18: _ZN2v88internalL26Builtin_Impl_HandleApiCallENS0_16BuiltinArgumentsEPNS0_7IsolateE
  19: Builtins_CEntry_Return1_DontSaveFPRegs_ArgvOnStack_BuiltinExit
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
fatal runtime error: failed to initiate panic, error 5
Aborted
bug cli
Source
picture denjucks

Most helpful comment

v1.0.5 will be released later today with a fix for this

picture ry on 3 Jun 2020
👍2 🎉1

All 18 comments

Duplicate of #6053

lucacasonato picture lucacasonato on 2 Jun 2020

Maybe not duplicate of #6053

@denjucks Can you please provide an example code ?

ry picture ry on 2 Jun 2020

Same command as #6053 with bash/lss

john@LAPP:/mnt/c/workspace$ RUST_BACKTRACE=1 /home/john/.deno/bin/deno
Deno 1.0.4
exit using ctrl+d or close()
> crypto.getRandomValues(new Uint8Array(10))
thread 'main' panicked at 'already borrowed: BorrowMutError', /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libcore/cell.rs:878:9
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.44/src/backtrace/libunwind.rs:86
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.44/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:78
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:59
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1063
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1426
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:62
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:204
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:224
  10: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:470
  11: rust_begin_unwind
             at src/libstd/panicking.rs:378
  12: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  13: core::option::expect_none_failed
             at src/libcore/option.rs:1211
  14: deno_core::bindings::send
  15: <extern "C" fn(A0) .> R as rusty_v8::support::CFnFrom<F>>::mapping::c_fn
  16: _ZN2v88internal25FunctionCallbackArguments4CallENS0_15CallHandlerInfoE
  17: _ZN2v88internal12_GLOBAL__N_119HandleApiCallHelperILb0EEENS0_11MaybeHandleINS0_6ObjectEEEPNS0_7IsolateENS0_6HandleINS0_10HeapObjectEEESA_NS8_INS0_20FunctionTemplateInfoEEENS8_IS4_EENS0_16BuiltinArgumentsE
  18: _ZN2v88internalL26Builtin_Impl_HandleApiCallENS0_16BuiltinArgumentsEPNS0_7IsolateE
  19: Builtins_CEntry_Return1_DontSaveFPRegs_ArgvOnStack_BuiltinExit
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
fatal runtime error: failed to initiate panic, error 5
Aborted (core dumped)
john@LAPP:/mnt/c/workspace$

seems to be the same error

hastri picture hastri on 2 Jun 2020

@hastri That was fixed in #6053

I'm interested in @denjucks's example code - which sounds unrelated to the REPL?

ry picture ry on 2 Jun 2020

Seeing a similar issue on AWS Lambda. Can provide the runtime code if you need.

START RequestId: 40e01d08-1921-46fa-91ec-bf299d4d2774 Version: $LATEST
thread 'main' panicked at 'already borrowed: BorrowMutError', /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libcore/cell.rs:878:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
fatal runtime error: failed to initiate panic, error 5
/opt/bootstrap: line 3:     9 Aborted                 (core dumped) DENO_DIR=/tmp/deno_dir deno run -A --unstable /opt/runtime.ts
END RequestId: 40e01d08-1921-46fa-91ec-bf299d4d2774
REPORT RequestId: 40e01d08-1921-46fa-91ec-bf299d4d2774  Duration: 375.07 ms Billed Duration: 400 ms Memory Size: 128 MB Max Memory Used: 13 MB
brianleroux picture brianleroux on 3 Jun 2020

@brianleroux Yes please provide some sample code so I can debug

ry picture ry on 3 Jun 2020

Custom runtime here: https://begin-deno-runtime.s3-us-west-1.amazonaws.com/deno-1.0.4.zip

Effectively AWS Lambda calls bootstrap which is just DENO_DIR=/tmp/deno_dir deno run -A --unstable /opt/runtime.ts

The handler code imported by runtime.ts to get this behavior was:

export async function handler() { 
  return { ok: true };
};

// runtime.ts
// coldstart here
let env = Deno.env.toObject();
let api = env.AWS_LAMBDA_RUNTIME_API;
let name = env._HANDLER.split(".")[0];
let method = env._HANDLER.split(".")[1];
let invoke = `http://${api}/2018-06-01/runtime/invocation`;
let error = `http://${api}/2018-06-01/runtime/init/error`;

// look for index.{js,ts,tsx} and fallback to mod.{js,ts,tsx}
let paths = [
  `${env.LAMBDA_TASK_ROOT}/index.js`,
  `${env.LAMBDA_TASK_ROOT}/mod.js`,
  `${env.LAMBDA_TASK_ROOT}/index.ts`,
  `${env.LAMBDA_TASK_ROOT}/mod.ts`,
  `${env.LAMBDA_TASK_ROOT}/index.tsx`,
  `${env.LAMBDA_TASK_ROOT}/mod.tsx`,
];

// get the handler entry file
let found = false;
let handler;

for (let path of paths) {
  found = await exists(path);
  if (found) {
    let mod = await import(path);
    handler = mod[method];
    if (typeof handler != "function") {
      found = false;
    } else {
      break;
    }
  }
}

// if entry file is missing or invalid bail hard with a meaningful error
if (found === false) {
  await post(error, {
    errorType: "HandlerNotFound",
    errorMessage:
      `expected one of mod.js, mod.ts, mod.tsx, index.js, index.ts, or index.tsx to export a function named "${method}"`,
  });
  Deno.exit(1);
}

// all good! start the event loop
while (true) {
  let { event, context } = await next(`${invoke}/next`);
  try {
    // invoke the handler
    const payload = await handler(event, context);
    await post(`${invoke}/${context.awsRequestId}/response`, payload);
  } catch (err) {
    // ensure errors bubble
    await post(`${invoke}/${context.awsRequestId}/error`, {
      errorType: err.name,
      errorMessage: err.message,
      stackTrace: err.stack,
    });
  }
}

/** helper to get next invocation */
async function next(url: string) {
  let env = Deno.env.toObject();
  let req = await fetch(url);
  let reqID = req.headers.get("Lambda-Runtime-Aws-Request-Id");
  let arn = req.headers.get("lambda-runtime-invoked-function-arn");
  let event = await req.json();
  let context = {
    awsRequestId: reqID,
    invokedFunctionArn: arn,
    logGroupName: env.AWS_LAMBDA_LOG_GROUP_NAME,
    logStreamName: env.AWS_LAMBDA_LOG_STREAM_NAME,
    functionName: env.AWS_LAMBDA_FUNCTION_NAME,
    functionVersion: env.AWS_LAMBDA_FUNCTION_VERSION,
    memoryLimitInMB: env.AWS_LAMBDA_FUNCTION_MEMORY_SIZE,
  };
  return { event, context };
}

/** helper to post message to lambda */
async function post(url: string, payload: object) {
  let result = await fetch(url, {
    method: "POST",
    body: JSON.stringify(payload),
  });
  await result.blob();
}

/** helper to check for the entry file */
async function exists(filename: string): Promise<boolean> {
  try {
    await Deno.stat(filename);
    return true;
  } catch (error) {
    if (error instanceof Deno.errors.NotFound) {
      return false;
    } else {
      throw error;
    }
  }
}
brianleroux picture brianleroux on 3 Jun 2020

Thanks @brianleroux but I'm still unable to repeat the failure.

If anyone can provide some small sample code that demonstrates this failure, that would be very helpful.

Once we figure out this issue, I'll be cutting a new release v1.0.5

ry picture ry on 3 Jun 2020

I'm def reproducing (tho perhaps I compiled the binary wrong?) Reran with RUST_BACKTRACE=1 and got the following output:

START RequestId: a7ae7ed8-4d24-4b80-b037-8b7accd63ec7 Version: $LATEST
thread 'main' panicked at 'already borrowed: BorrowMutError', /rustc/4fb7144ed159f94491249e86d5bbd033b5d60550/src/libcore/cell.rs:878:9
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.44/src/backtrace/libunwind.rs:86
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.44/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:78
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:59
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1063
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1426
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:62
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:204
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:224
  10: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:470
  11: rust_begin_unwind
             at src/libstd/panicking.rs:378
  12: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  13: core::option::expect_none_failed
             at src/libcore/option.rs:1211
  14: deno_core::bindings::send
  15: <extern "C" fn(A0) .> R as rusty_v8::support::CFnFrom<F>>::mapping::c_fn
  16: _ZN2v88internal25FunctionCallbackArguments4CallENS0_15CallHandlerInfoE
  17: _ZN2v88internal12_GLOBAL__N_119HandleApiCallHelperILb0EEENS0_11MaybeHandleINS0_6ObjectEEEPNS0_7IsolateENS0_6HandleINS0_10HeapObjectEEESA_NS8_INS0_20FunctionTemplateInfoEEENS8_IS4_EENS0_16BuiltinArgumentsE
  18: _ZN2v88internalL26Builtin_Impl_HandleApiCallENS0_16BuiltinArgumentsEPNS0_7IsolateE
  19: Builtins_CEntry_Return1_DontSaveFPRegs_ArgvOnStack_BuiltinExit
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
fatal runtime error: failed to initiate panic, error 5
/opt/bootstrap: line 3:     9 Aborted                 (core dumped) DENO_DIR=/tmp/deno_dir RUST_BACKTRACE=1 deno run -A --unstable /opt/runtime.ts
END RequestId: a7ae7ed8-4d24-4b80-b037-8b7accd63ec7
REPORT RequestId: a7ae7ed8-4d24-4b80-b037-8b7accd63ec7  Duration: 2543.13 ms    Billed Duration: 2600 ms    Memory Size: 128 MB Max Memory Used: 70 MB  
RequestId: a7ae7ed8-4d24-4b80-b037-8b7accd63ec7 Error: Runtime exited with error: exit status 134
Runtime.ExitError
brianleroux picture brianleroux on 3 Jun 2020

@ry 

// a.js
await import(new URL("./b.js", import.meta.url).toString());
const conn = Deno.connect({hostname: "localhost", port: 8080});

// b.js
// (empty)
SyrupThinker picture SyrupThinker on 3 Jun 2020
👍2

https://github.com/xcatliu/pagic/issues/22

await import(new URL('./b.js', import.meta.url).toString());
const watcher = Deno.watchFs('.');
xcatliu picture xcatliu on 3 Jun 2020

The problem is due to await in dynamic import, see https://github.com/denoland/deno/issues/6071#issuecomment-638298318

apiel picture apiel on 3 Jun 2020

v1.0.5 will be released later today with a fix for this

ry picture ry on 3 Jun 2020
👍2 🎉1

confirmed fixed! thank u 馃嵒

brianleroux picture brianleroux on 3 Jun 2020

@ry Repro when using debug mode in vscode (but only when import https://dev.jspm.io/[email protected]):

// a.ts
import * as ts from 'https://dev.jspm.io/[email protected]';
console.log(ts.default.transpileModule('const foo: number = 1;', {}).outputText);

Above code works fine in normal deno:

$ deno --version
deno 1.1.0
v8 8.4.300
typescript 3.9.2
$ deno run -A a.ts              
var foo = 1;

However, it throws error when debug in vscode:

/Users/xcatliu/.deno/bin/deno run --inspect-brk -A a.ts 
Debugger listening on ws://127.0.0.1:9229/ws/118bc875-11b7-43b2-8b0a-30baa323b8ad
Debugger session started.
thread 'main' panicked at 'already borrowed: BorrowMutError', /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libcore/cell.rs:878:9
stack backtrace:
   0:        0x110d7e9bf - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h83d53b696ac99295
   1:        0x110daadfe - core::fmt::write::hf81c429634e1f3ed
   2:        0x110d75917 - std::io::Write::write_fmt::had2a3b01a2c037b5
   3:        0x110d8100a - std::panicking::default_hook::{{closure}}::ha991e4eca34b4afa
   4:        0x110d80d4c - std::panicking::default_hook::h722aa3f5c1c31788
   5:        0x110d815d8 - std::panicking::rust_panic_with_hook::h2cd47f71d6d55501
   6:        0x110d811a2 - rust_begin_unwind
   7:        0x110dd595f - core::panicking::panic_fmt::h299f54c72477a62a
   8:        0x110dd5865 - core::result::unwrap_failed::hf7a9e1e19e331f17
   9:        0x1101dd1c6 - deno_core::bindings::send::h9bde1f22d54f964b
  10:        0x1101bf4ad - <extern "C" fn(A0) .> R as rusty_v8::support::CFnFrom<F>>::mapping::c_fn::h184c60d18e8b8431
  11:        0x11025eb4f - _ZN2v88internal25FunctionCallbackArguments4CallENS0_15CallHandlerInfoE
  12:        0x11025e061 - _ZN2v88internal12_GLOBAL__N_119HandleApiCallHelperILb0EEENS0_11MaybeHandleINS0_6ObjectEEEPNS0_7IsolateENS0_6HandleINS0_10HeapObjectEEESA_NS8_INS0_20FunctionTemplateInfoEEENS8_IS4_EENS0_16BuiltinArgumentsE
  13:        0x11025d6d1 - _ZN2v88internalL26Builtin_Impl_HandleApiCallENS0_16BuiltinArgumentsEPNS0_7IsolateE
fatal runtime error: failed to initiate panic, error 5

The launch.json config:

{
  "version": "0.2.0",
  "configurations": [
    {
      "env": {
        "RUST_BACKTRACE": "full"
      },
      "name": "Deno",
      "type": "node",
      "request": "launch",
      "cwd": "${workspaceFolder}",
      "runtimeExecutable": "deno",
      "runtimeArgs": ["run", "--inspect-brk", "-A", "a.ts"],
      "port": 9229
    }
  ]
}

VSCode Version: 1.46.0

xcatliu picture xcatliu on 16 Jun 2020

@xcatliu I can't repeat and it is very likely unrelated to this issue. Please open a new issue and provide an example of a crash from the command-line (not vs code) and I will gladly debug it for you.

ry picture ry on 16 Jun 2020

Please open a new issue and provide an example of a crash from the command-line (not vs code)

@ry The point is, command-line works fine but vscode debug throws error 馃槬

// a.ts
import * as ts from 'https://dev.jspm.io/[email protected]';
console.log(ts.default.transpileModule('const foo: number = 1;', {}).outputText);
xcatliu picture xcatliu on 17 Jun 2020

@xcatliu Yes I was unable to repeat in vscode... but to be honest I'm not very familiar with it. Please open a new issue and describe the problem again. I'm relatively certain it's the same error message but not the same as this one.

ry picture ry on 17 Jun 2020
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