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

[mikhasd]

I have just built wasmtime and tried to run a simple command:

~/dev/wasmtime/target/release/wasmtime graph.wasm

thread 'main' panicked at 'already borrowed: BorrowMutError', src/libcore/result.rs:999:5
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:47
   3: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:36
   4: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:198
   5: std::panicking::default_hook
             at src/libstd/panicking.rs:212
   6: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:475
   7: std::panicking::continue_panic_fmt
             at src/libstd/panicking.rs:382
   8: rust_begin_unwind
             at src/libstd/panicking.rs:309
   9: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  10: core::result::unwrap_failed
  11: wasmtime_init_finish
  12: wasmtime_runtime::instance::InstanceHandle::new
  13: wasmtime_wast::spectest::instantiate_spectest
  14: wasmtime::main
  15: std::rt::lang_start::{{closure}}
  16: std::rt::lang_start_internal::{{closure}}
             at src/libstd/rt.rs:49
  17: std::panicking::try::do_call
             at src/libstd/panicking.rs:294
  18: __rust_maybe_catch_panic
             at src/libpanic_unwind/lib.rs:82
  19: std::panicking::try
             at src/libstd/panicking.rs:273
  20: std::panic::catch_unwind
             at src/libstd/panic.rs:388
  21: std::rt::lang_start_internal
             at src/libstd/rt.rs:48
  22: main
  23: __libc_start_main
  24: _start
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:347:21
stack backtrace:
   0:     0x55595b8c2fcb - backtrace::backtrace::libunwind::trace::hee16fdad5997e164
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
   1:     0x55595b8c2fcb - backtrace::backtrace::trace_unsynchronized::haf0450f72372f592
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
   2:     0x55595b8c2fcb - std::sys_common::backtrace::_print::h05ce790c31111ac9
                               at src/libstd/sys_common/backtrace.rs:47
   3:     0x55595b8c2fcb - std::sys_common::backtrace::print::h0ff493cc4d2d2ae6
                               at src/libstd/sys_common/backtrace.rs:36
   4:     0x55595b8c2fcb - std::panicking::default_hook::{{closure}}::hab4f96382fb4b194
                               at src/libstd/panicking.rs:198
   5:     0x55595b8c2cce - std::panicking::default_hook::h8edc7382c3bc85e5
                               at src/libstd/panicking.rs:212
   6:     0x55595b8c3740 - std::panicking::rust_panic_with_hook::hcd9f879ec989ce4d
                               at src/libstd/panicking.rs:475
   7:     0x55595b8c32c2 - std::panicking::continue_panic_fmt::h4b92ca51a5d8f90c
                               at src/libstd/panicking.rs:382
   8:     0x55595b8c31a6 - rust_begin_unwind
                               at src/libstd/panicking.rs:309
   9:     0x55595b8dcffd - core::panicking::panic_fmt::h76420a1d3d63d38a
                               at src/libcore/panicking.rs:85
  10:     0x55595b8dcf3c - core::panicking::panic::h7988f6b8a74ce9b4
                               at src/libcore/panicking.rs:49
  11:     0x55595b64e1da - std::thread::local::LocalKey<T>::with::h407f07886df8e514
  12:     0x55595b64aafd - Unwind
  13:     0x55595b650db3 - _ZL15WasmTrapHandleriP9siginfo_tPv
  14:     0x7ff5bd216f40 - <unknown>
  15:     0x55595b649b62 - wasmtime_init_finish
  16:     0x55595b648126 - wasmtime_runtime::instance::InstanceHandle::new::h21223c5f21299e02
  17:     0x55595b5c2d92 - wasmtime_wast::spectest::instantiate_spectest::h51b0a58177bf3199
  18:     0x55595b597dd6 - wasmtime::main::ha9be6962cd6baa7b
  19:     0x55595b595fd3 - std::rt::lang_start::{{closure}}::hc7b0fd2866a9683c
  20:     0x55595b8c3143 - std::rt::lang_start_internal::{{closure}}::h0d9d3a9c3cc0a33e
                               at src/libstd/rt.rs:49
  21:     0x55595b8c3143 - std::panicking::try::do_call::h8a3e545414bd3807
                               at src/libstd/panicking.rs:294
  22:     0x55595b8c66aa - __rust_maybe_catch_panic
                               at src/libpanic_unwind/lib.rs:82
  23:     0x55595b8c3d0d - std::panicking::try::h9e35c35221d74c26
                               at src/libstd/panicking.rs:273
  24:     0x55595b8c3d0d - std::panic::catch_unwind::h30f9df8c252fe03c
                               at src/libstd/panic.rs:388
  25:     0x55595b8c3d0d - std::rt::lang_start_internal::h075e7b80ec0300cc
                               at src/libstd/rt.rs:48
  26:     0x55595b59a9e2 - main
  27:     0x7ff5bd024b6b - __libc_start_main
  28:     0x55595b594bfa - _start
  29:                0x0 - <unknown>
thread panicked while panicking. aborting.
thread panicked while processing panic. aborting.
thread panicked while processing panic. aborting.

I have used rust nightly to compile it:

rustc 1.37.0-nightly (2fe7b3383 2019-06-19

[sunfishcode]

Thanks for the report! Which platform are you seeing this on? Also, are you able to post the graph.wasm file somewhere?

[mikhasd]

Hi! you can find the binary here and the source code here

[bbigras]

Any progress on this? I got a similar error.

[peterhuene]

Hi @bbigras. I'm unable to reproduce the original problem out of master with the original program (graph.wasm). I think the changes to the trap handling in #253 may have inadvertently fixed the original problem.

Do you have a wasm file I can reproduce your issue with? Thanks!

[bbigras]

I might have an old wasmtime (20190521).

wasi-hello-world.zip

RUST_BACKTRACE=full wasmtime target/wasm32-wasi/debug/wasi-hello-world.wasm
thread 'main' panicked at 'already borrowed: BorrowMutError', src/libcore/result.rs:1084:5
stack backtrace:
   0:     0x5567dd55b771 - std::sys_common::backtrace::print::h74e8383011c48ac1
   1:     0x5567dd550e14 - std::panicking::default_hook::{{closure}}::hc989d29eac1bf07a
   2:     0x5567dd550ba3 - std::panicking::default_hook::h999474d3b9874310
   3:     0x5567dd551520 - std::panicking::rust_panic_with_hook::h8ac69ca134e1594e
   4:     0x5567dd5510a2 - std::panicking::continue_panic_fmt::ha458e61c9ee535d1
   5:     0x5567dd550f86 - rust_begin_unwind
   6:     0x5567dd575f0d - core::panicking::panic_fmt::hdbb1e8356e4e7099
   7:     0x5567dd56fa27 - core::result::unwrap_failed::h0e98f81ef171a4f8
   8:     0x5567dd2f6379 - wasmtime_init_finish
   9:     0x5567dd2f49c6 - wasmtime_runtime::instance::InstanceHandle::new::h12eeccb065d5f844
  10:     0x5567dd2588cb - wasmtime_wast::spectest::instantiate_spectest::hfcc9d5dd0cd83c76
  11:     0x5567dd22ee46 - wasmtime::main::he8880607d4290727
  12:     0x5567dd22cfd3 - std::rt::lang_start::{{closure}}::h6d689296becf02cb
  13:     0x5567dd550f23 - std::panicking::try::do_call::h0c14233a80d9596c
  14:     0x5567dd55d47a - __rust_maybe_catch_panic
  15:     0x5567dd553749 - std::rt::lang_start_internal::h34c921f5951345b4
  16:     0x5567dd231ad5 - main
  17:     0x7f7850882b8e - __libc_start_main
  18:     0x5567dd22bbfa - _start
  19:                0x0 - <unknown>

[peterhuene]

Hi @bbigras. It does look like your wasmtime version is older than what I believe to be the fixed version. I am able to run your wasm file without issue using both the latest out of master and the 0.3.0 release.

If you upgrade your wasmtime to 0.3.0, that should help fix the issue.

As I can not reproduce this failure any longer and I'm fairly confident the fix was in #253, I believe we can close this issue. Please let me know if a newer version of wasmtime does not fix your issue. Thanks!

[bbigras]

Sorry for the late reply. NixOS unstable now has 20191018 and using it fixed my issue. Thanks.