program works most of the time but sometimes run into a dead state consuming 100% CPU usage #709
Description
Async-std is really an awesome library for writing async programs.
I've written a small socks5 server using async-std, and it works most of the time.
But sometimes, the server suddenly enter into a weird state, without responding to anything.
Use top I can see that the process is consuming 100% CPU, something like dead loop/lock.
Attach gdb to the process and call stack is as below.
[Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". 0x00007fda95b789f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5562f9b5bdd8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88 88 ../sysdeps/unix/sysv/linux/futex-internal.h: No such file or directory. (gdb) bt #0 0x00007fda95b789f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5562f9b5bdd8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88 #1 __pthread_cond_wait_common (abstime=0x0, mutex=0x5562f9b5bd80, cond=0x5562f9b5bdb0) at pthread_cond_wait.c:502 #2 __pthread_cond_wait (cond=0x5562f9b5bdb0, mutex=0x5562f9b5bd80) at pthread_cond_wait.c:655 #3 0x00005562f85c5b4d in crossbeam_utils::sync::parker::Inner::park () #4 0x00005562f85c57fb in crossbeam_utils::sync::parker::Parker::park () #5 0x00005562f840f561 in std::thread::local::LocalKey<T>::with () #6 0x00005562f840f3ed in std::thread::local::LocalKey<T>::with () #7 0x00005562f843e8e5 in async_std::task::block_on::block_on () #8 0x00005562f8417df2 in mysocks::main () #9 0x00005562f8415fd0 in std::rt::lang_start::{{closure}} () #10 0x00005562f85d4653 in std::rt::lang_start_internal::{{closure}} () at src/libstd/rt.rs:52 #11 std::panicking::try::do_call () at src/libstd/panicking.rs:292 #12 0x00005562f85d869a in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:78 #13 0x00005562f85d50a0 in std::panicking::try () at src/libstd/panicking.rs:270 #14 std::panic::catch_unwind () at src/libstd/panic.rs:394 #15 std::rt::lang_start_internal () at src/libstd/rt.rs:51 #16 0x00005562f8417ef2 in main () Any hint on the root cause of this issue? And how could I debug into this issue?