fix double panic when exceeding the branch limit in Drop
#245
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Signed-off-by: Eliza Weisman <eliza@buoyant.io>
Signed-off-by: Eliza Weisman <eliza@buoyant.io>
Loom will panic if the maximum number of branches is exceeded. If a type's `Drop` impl performs a branch (for example, a `MutexGuard` or `Arc`, or a user-defined type that performs atomic operations in its `Drop` impl), we will hit the assertion a _second_ time, resulting in a double panic. This sucks, because it makes these test failures much harder to debug. This branch fixes the issue by changing the assertion checking path length to also check if the current thread is panicking. If we're already panicking, we don't make the assertion, to avoid causing a double panic. I've added a test that reproduces this double panic, as well. I've also fixed a typo in the assertion message. :)
Darksonn
approved these changes
Dec 4, 2021
hawkw
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May 10, 2022
# 0.5.5 (May 10, 2022) ### Added - sync: Add `Arc::from_std` without `T: Sized` bound (#226) - sync: Implement `Debug` for `AtomicPtr` for all `T` (#255) - logs: Add location tracking for threads and atomic operations (#258) - logs: Add additional location tracking to `Arc`, `alloc`, and `mpsc` (#265) - logs: Improve `tracing` configuration for `LOOM_LOG` (#266) - logs: Add a span for the current model's iteration (#267) ### Documented - Add note about in-memory representation of atomic types (#253) - Document `LOOM_LOG` syntax (#257) ### Fixed - Fix double panic when exceeding the branch limit in `Drop` (#245) - cell: Allow using `{Mut,Const}Ptr::{deref,with}` when the pointee is `!Sized` (#247) - thread: Fix semantics of `thread::park` after `Thread::unpark` (#250)
hawkw
added a commit
that referenced
this pull request
May 13, 2022
# 0.5.5 (May 10, 2022) ### Added - sync: Add `Arc::from_std` without `T: Sized` bound (#226) - sync: Implement `Debug` for `AtomicPtr` for all `T` (#255) - logs: Add location tracking for threads and atomic operations (#258) - logs: Add additional location tracking to `Arc`, `alloc`, and `mpsc` (#265) - logs: Improve `tracing` configuration for `LOOM_LOG` (#266) - logs: Add a span for the current model's iteration (#267) ### Documented - Add note about in-memory representation of atomic types (#253) - Document `LOOM_LOG` syntax (#257) ### Fixed - Fix double panic when exceeding the branch limit in `Drop` (#245) - cell: Allow using `{Mut,Const}Ptr::{deref,with}` when the pointee is `!Sized` (#247) - thread: Fix semantics of `thread::park` after `Thread::unpark` (#250)
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Loom will panic if the maximum number of branches is exceeded. If a
type's
Dropimpl performs a branch (for example, aMutexGuardorArc, or a user-defined type that performs atomic operations in itsDropimpl), we will hit the assertion a second time, resulting in adouble panic. This sucks, because it makes these test failures much
harder to debug.
This branch fixes the issue by changing the assertion checking path
length to also check if the current thread is panicking. If we're
already panicking, we don't make the assertion, to avoid causing a
double panic. I've added a test that reproduces this double panic, as
well.
I've also fixed a typo in the assertion message. :)
Signed-off-by: Eliza Weisman eliza@buoyant.io