Update dependencies and fix unsoundness and CI failure #29

taiki-e · 2020-12-22T06:47:33Z

No description provided.

codecov · 2020-12-22T06:50:41Z

Codecov Report

Merging #29 (5d85f31) into master (05f397e) will decrease coverage by 5.07%.
The diff coverage is 81.48%.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   91.00%   85.92%   -5.08%     
==========================================
  Files           2        2              
  Lines         289      341      +52     
==========================================
+ Hits          263      293      +30     
- Misses         26       48      +22

Impacted Files	Coverage Δ
src/lib.rs	`78.13% <81.48%> (-6.43%)`	⬇️
tests/lib.rs	`99.20% <0.00%> (-0.01%)`	⬇️

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taiki-e · 2020-12-22T07:08:42Z

Hmm, Miri reports UB, but this is a Stacked Borrows violation.

error: Undefined Behavior: trying to reborrow for SharedReadOnly at alloc83270+0x8, but parent tag <212137> does not have an appropriate item in the borrow stack
   --> /home/vsts/work/1/s/src/lib.rs:207:14
    |
207 |         drop(state);
    |              ^^^^^ trying to reborrow for SharedReadOnly at alloc83270+0x8, but parent tag <212137> does not have an appropriate item in the borrow stack
    |
    = help: this indicates a potential bug in the program: it performed an invalid operation, but the rules it violated are still experimental
    = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
            
    = note: inside `bus::Seat::<bool>::take` at /home/vsts/work/1/s/src/lib.rs:207:14
    = note: inside `bus::BusReader::<bool>::recv_inner` at /home/vsts/work/1/s/src/lib.rs:659:19
    = note: inside `bus::BusReader::<bool>::try_recv` at /home/vsts/work/1/s/src/lib.rs:707:9
note: inside `it_detects_closure` at tests/lib.rs:105:16
   --> tests/lib.rs:105:16
    |
105 |     assert_eq!(rx.try_recv(), Ok(true));
    |                ^^^^^^^^^^^^^
note: inside closure at tests/lib.rs:101:1
   --> tests/lib.rs:101:1
    |
101 | / fn it_detects_closure() {
102 | |     let mut tx = bus::Bus::new(1);
103 | |     let mut rx = tx.add_rx();
104 | |     assert_eq!(tx.try_broadcast(true), Ok(()));
...   |
108 | |     assert_eq!(rx.try_recv(), Err(mpsc::TryRecvError::Disconnected));
109 | | }
    | |_^
    = note: inside `<[closure@tests/lib.rs:101:1: 109:2] as std::ops::FnOnce<()>>::call_once - shim` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5
    = note: inside `<fn() as std::ops::FnOnce<()>>::call_once - shim(fn())` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5
    = note: inside `test::__rust_begin_short_backtrace::<fn()>` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/test/src/lib.rs:516:5
    = note: inside closure at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/test/src/lib.rs:507:30
    = note: inside `<[closure@test::run_test::{closure#2}] as std::ops::FnOnce<()>>::call_once - shim(vtable)` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5
    = note: inside `<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send> as std::ops::FnOnce<()>>::call_once` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1328:9
    = note: inside `<std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>> as std::ops::FnOnce<()>>::call_once` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:322:9
    = note: inside `std::panicking::r#try::do_call::<std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>>, ()>` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:379:40
    = note: inside `std::panicking::r#try::<(), std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>>>` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:343:19
    = note: inside `std::panic::catch_unwind::<std::panic::AssertUnwindSafe<std::boxed::Box<dyn std::ops::FnOnce() + std::marker::Send>>, ()>` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:396:14
    = note: inside `test::run_test_in_process` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/test/src/lib.rs:538:18
    = note: inside closure at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/test/src/lib.rs:449:39
    = note: inside `test::run_test::run_test_inner` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/test/src/lib.rs:474:13
    = note: inside `test::run_test` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/test/src/lib.rs:504:28
    = note: inside `test::run_tests::<[closure@test::run_tests_console::{closure#2}]>` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/test/src/lib.rs:283:13
    = note: inside `test::run_tests_console` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/test/src/console.rs:289:5
    = note: inside `test::test_main` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/test/src/lib.rs:121:15
    = note: inside `test::test_main_static` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/test/src/lib.rs:140:5
    = note: inside `main`
    = note: inside `<fn() as std::ops::FnOnce<()>>::call_once - shim(fn())` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5
    = note: inside `std::sys_common::backtrace::__rust_begin_short_backtrace::<fn(), ()>` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys_common/backtrace.rs:125:18
    = note: inside closure at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:66:18
    = note: inside `std::ops::function::impls::<impl std::ops::FnOnce<()> for &dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe>::call_once` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:259:13
    = note: inside `std::panicking::r#try::do_call::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:379:40
    = note: inside `std::panicking::r#try::<i32, &dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe>` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:343:19
    = note: inside `std::panic::catch_unwind::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:396:14
    = note: inside `std::rt::lang_start_internal` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:51:25
    = note: inside `std::rt::lang_start::<()>` at /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:65:5
    = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error; 1 warning emitted

error: test failed, to rerun pass '--test lib'

jonhoo · 2020-12-25T22:55:26Z

@taiki-e Thanks! How should I think about this miri error? Like a likely false positive, or as a likely bug? It's been a while since I looked at this code, so I totally believe that it might contain bugs, but don't want to page it all in if this has a high chance of being a false positive 😅

taiki-e · 2020-12-26T03:07:21Z

I read a bit of the code, but I think the problem is probably due to we mutably accessing the value that already immutably referenced (i.e., I think this is a bug):

First, we get an immutable reference to the state:

bus/src/lib.rs

Lines 159 to 177 in 05f397e

    
           // the writer will only modify this element when .read hits .max - writer.rleft[i]. we can 
        
           // be sure that this is not currently the case (which means it's safe for us to read) 
        
           // because: 
        
           // 
        
           //  - .max is set to the number of readers at the time when the write happens 
        
           //  - any joining readers will start at a later seat 
        
           //  - so, at most .max readers will call .take() on this seat this time around the buffer 
        
           //  - a reader must leave either *before* or *after* a call to recv. there are two cases: 
        
           // 
        
           //    - it leaves before, rleft is decremented, but .take is not called 
        
           //    - it leaves after, .take is called, but head has been incremented, so rleft will be 
        
           //      decremented for the *next* seat, not this one 
        
           // 
        
           //    so, either .take is called, and .read is incremented, or writer.rleft is incremented. 
        
           //    thus, for a writer to modify this element, *all* readers at the time of the previous 
        
           //    write to this seat must have either called .take or have left. 
        
           //  - since we are one of those readers, this cannot be true, so it's safe for us to assume 
        
           //    that there is no concurrent writer for this seat 
        
           let state = unsafe { &*self.state.get() };

Next, we are calling self.state.get() on this line and modifying (.take()) the returned state. Note that the immutable reference that we first got is still alive when this is called.

bus/src/lib.rs

Lines 194 to 196 in 05f397e

    
           // since we're the last reader, no-one else will be cloning this value, so we can 
        
           // safely take a mutable reference, and just take the val instead of cloning it. 
        
           unsafe { &mut *self.state.get() }.val.take().unwrap()

Finally, drop the immutable reference that we first got. Dropping reference is a no-op. However, this tells the compiler that the reference is valid at least up to this line.

bus/src/lib.rs

Lines 204 to 207 in 05f397e

    
           // let writer know that we no longer need this item. 
        
           // state is no longer safe to access. 
        
           #[allow(clippy::drop_ref)] 
        
           drop(state);

This can be fixed by removing drop(state) or moving it before mutable access.
I'll push a fix.

taiki-e · 2020-12-26T03:32:55Z

Hmm, There is another Miri error. (This is likely not a bug).

error: unsupported operation: the main thread terminated without waiting for other threads
  |
  = note: the main thread terminated without waiting for other threads
  = note: (no span available)
  = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support

I'm not sure what's happening, but I'll always get this error unless I disable all tests... 😅

taiki-e · 2020-12-26T03:56:05Z

= note: the main thread terminated without waiting for other threads

Considering that the following code also causes an error, probably related to the thread spawned in Bus::new, but I'm not sure if there is a workaround other than disabling Miri test.

#[test]
fn it_fails_when_full() {
    let _x = bus::Bus::<bool>::new(1);
}

bus/src/lib.rs

Lines 301 to 305 in 05f397e

    
           thread::spawn(move || { 
        
               for t in unpark_rx.iter() { 
        
                   t.unpark(); 
        
               } 
        
           });

src/lib.rs

jonhoo · 2020-12-27T19:25:32Z

Ouch, that's a pretty significant limitation. What program captures all of its running threads! Not sure what is best to do about this. One might be to have a test-only constructor that returns the Bus and a FnOnce + Send + 'static that the caller should spawn (and which tests can then wait for)? Is there a tracking issue for this limitation on the miri side @RalfJung?

RalfJung · 2020-12-29T15:07:39Z

Yes: rust-lang/miri#1371

jonhoo · 2020-12-31T04:54:35Z

Thanks Ralf! Is there a way for us to disable that panic for the time being? I would like to do this update if possible, but not if it means miri won't run.

RalfJung · 2020-12-31T11:31:59Z

I suppose we could add a flag which ignores "thread leaks" -- it would have to also disable the memory leak checker though since otherwise the stack and thread-local storage of that other thread would all be considered leaked.

Do you have any idea what should happen wrt. thread-local destructors? Presumably they simply do not run for "leaked" threads?

I do have some other patches I want to get done before the end of my vacation though, so I cannot promise a timeline.

jonhoo · 2021-01-01T05:50:55Z

@RalfJung I believe Rust will actually run the destructors for thread-locals in all threads on main exit using thread-local destructors (a feature provided by glibc under the name __cxa_thread_atexit_impl): https://github.com/rust-lang/rust/blob/0d97f7a96877a96015d70ece41ad08bb7af12377/library/std/src/sys/unix/thread_local_dtor.rs. This is also suggested by the UNIX implementation for thread locals, which uses pthread_key_create, which in turn says it will run the destructors on exit.

RalfJung · 2021-01-01T13:25:58Z

That should be the destructors for the main thread... wouldn't it be unsound to run other thread's thread local destructors? They could be in use by that thread!

Anyway that sounds more like a discussion for rust-lang/miri#1371 than for this issue.

lespea · 2022-06-16T19:01:39Z

Any update on this by chance? There's now a vulnerability in the version of crossbeam-utils that this package depends on (crossbeam-rs/crossbeam#781)

taiki-e · 2022-06-17T02:04:44Z

Miri currently fails in various projects due to two issues. Although it is probably possible to work around them by disabling weak memory emulation and preemption.
This crate is not affected by crossbeam#781.
This crate depends on atomic-option with vulnerabilities that could affect this crate.
The latest version of parking_lot_core is 0.9 and it requires Rust 1.49.
CI uses ubuntu 16.04 which is no longer supported.

taiki-e · 2022-06-17T05:25:56Z

CI is now green, except codecov which is angry that the comments (and impl blocks with no items) I added were not covered.

RalfJung · 2022-06-18T15:01:10Z

azure-pipelines.yml

-     - bash: yes | cargo miri -Zmiri-ignore-leaks test
+     # disable preemption due to https://github.com/rust-lang/rust/issues/55005
+     # disable weak memory emulation due to https://github.com/rust-lang/miri/issues/2223
+     - bash: MIRIFLAGS="-Zmiri-disable-isolation -Zmiri-ignore-leaks -Zmiri-preemption-rate=0 -Zmiri-disable-weak-memory-emulation" cargo miri test


Why do you need to disable isolation now when that was not needed before?

It is needed for recv_timeout that uses Instant. (recv_timeout has only been tested at doc test, so that flag was not needed before.)

error: unsupported operation: `clock_gettime` not available when isolation is enabled --> /home/vsts/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/unix/time.rs:341:26 | 341 | cvt(unsafe { libc::clock_gettime(clock, t.as_mut_ptr()) }).unwrap(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `clock_gettime` not available when isolation is enabled | = help: pass the flag `-Zmiri-disable-isolation` to disable isolation; = help: or pass `-Zmiri-isolation-error=warn` to configure Miri to return an error code from isolated operations (if supported for that operation) and continue with a warning = note: inside `std::sys::unix::time::inner::<impl std::sys::unix::time::Timespec>::now` at /home/vsts/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/unix/time.rs:341:26 = note: inside `std::sys::unix::time::inner::Instant::now` at /home/vsts/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/unix/time.rs:275:26 = note: inside `std::time::Instant::now` at /home/vsts/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/time.rs:276:17 note: inside `bus::BusReader::<bool>::recv_inner` at /home/vsts/work/1/s/src/lib.rs:587:47 --> /home/vsts/work/1/s/src/lib.rs:587:47 | 587 | RecvCondition::Timeout(_) => Some(time::Instant::now()), | ^^^^^^^^^^^^^^^^^^^^ note: inside `bus::BusReader::<bool>::recv_timeout` at /home/vsts/work/1/s/src/lib.rs:762:9 --> /home/vsts/work/1/s/src/lib.rs:762:9 | 762 | self.recv_inner(RecvCondition::Timeout(timeout)) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ note: inside `main::_doctest_main_src_lib_rs_747_0` at src/lib.rs:12:44 --> src/lib.rs:756:44 | 12 | assert_eq!(Err(RecvTimeoutError::Timeout), rx.recv_timeout(timeout)); | ^^^^^^^^^^^^^^^^^^^^^^^^

Ah, makes sense.

Btw, the Futex issue is fixed in Miri (should ship with the next nightly).

jonhoo

Amazing, thank you for following up on this after all this time ❤️

jonhoo · 2022-06-19T05:23:19Z

Released in 2.2.4 🎉

taiki-e force-pushed the deps branch from 9c727fe to 120fe39 Compare December 22, 2020 07:38

taiki-e force-pushed the deps branch from 120fe39 to dd62df4 Compare December 26, 2020 03:08

jonhoo reviewed Dec 27, 2020

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jonhoo mentioned this pull request Jan 5, 2021

Support detached threads still running when the main thread exits ("thread leaks") rust-lang/miri#1371

Open

3 tasks

taiki-e added 6 commits June 17, 2022 11:36

Update crossbeam-channel to 0.5

7978308

Update parking_lot_core to 0.8

c54d6f0

Fix miri test

5618b7b

Move drop(state) to fix UB

95aa5bf

Disable Miri weak memory emulation and preemption

732dc9f

Update parking_lot_core to 0.9

4384de5

taiki-e force-pushed the deps branch from dd62df4 to 4384de5 Compare June 17, 2022 02:49

taiki-e changed the title ~~Update crossbeam-channel to 0.5, parking_lot_core to 0.8~~ Update crossbeam-channel to 0.5, parking_lot_core to 0.9 Jun 17, 2022

taiki-e added 2 commits June 17, 2022 11:54

Use ubuntu-latest instead of ubuntu-16.04 in CI

183dc72

Fix Miri installation

a1177d4

taiki-e force-pushed the deps branch from cbc7867 to a1177d4 Compare June 17, 2022 03:04

Pass -Zmiri-disable-isolation

a26092c

taiki-e force-pushed the deps branch 2 times, most recently from 483911d to ae7de3f Compare June 17, 2022 03:39

taiki-e changed the title ~~Update crossbeam-channel to 0.5, parking_lot_core to 0.9~~ Update dependencies and fix unsoundness Jun 17, 2022

taiki-e changed the title ~~Update dependencies and fix unsoundness~~ Update dependencies and fix unsoundness snd CI failure Jun 17, 2022

taiki-e force-pushed the deps branch from 2823823 to 9cb9ea3 Compare June 17, 2022 03:51

taiki-e added 2 commits June 17, 2022 12:58

Update azure pipelines templates

b70eee7

Bump MSRV to 1.49

eaed299

taiki-e force-pushed the deps branch 4 times, most recently from afef3c9 to 365c3f4 Compare June 17, 2022 04:59

taiki-e added 2 commits June 17, 2022 14:05

Ignore a doc test with Miri

a92614c

Remove dependency on unsound atomic-option crate

5d85f31

taiki-e force-pushed the deps branch from 365c3f4 to 5d85f31 Compare June 17, 2022 05:05

taiki-e changed the title ~~Update dependencies and fix unsoundness snd CI failure~~ Update dependencies and fix unsoundness and CI failure Jun 17, 2022

taiki-e requested a review from jonhoo June 17, 2022 05:27

RalfJung reviewed Jun 18, 2022

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jonhoo approved these changes Jun 19, 2022

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jonhoo merged commit 6e41fb6 into jonhoo:master Jun 19, 2022

taiki-e deleted the deps branch June 19, 2022 05:23

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Update dependencies and fix unsoundness and CI failure #29

Update dependencies and fix unsoundness and CI failure #29

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Update dependencies and fix unsoundness and CI failure #29

Update dependencies and fix unsoundness and CI failure #29

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