DHAT hangs

[pacak]

I noticed that the program I'm trying to monitor with dhat hangs when it is about to exit in some cases.
Program prints stuff to stderr to report progress and around the exit - this might be important.

I attached to the process with the debugger and found this in a backtrace when it was hanging.

#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x000055e311833c64 in std::sys::unix::futex::futex_wait () at library/std/src/sys/unix/futex.rs:62
#2  std::sys::unix::locks::futex_mutex::Mutex::lock_contended () at library/std/src/sys/unix/locks/futex_mutex.rs:56
#3  0x000055e31185abff in std::sys::unix::locks::futex_mutex::Mutex::lock () at library/std/src/sys/unix/locks/futex_mutex.rs:28
#4  std::sync::remutex::ReentrantMutex::lock<core::cell::RefCell<std::io::stdio::StderrRaw>> () at library/std/src/sync/remutex.rs:103
#5  std::io::stdio::Stderr::lock () at library/std/src/io/stdio.rs:888
#6  std::io::stdio::{impl#19}::write_fmt () at library/std/src/io/stdio.rs:947
#7  0x000055e31185b859 in std::io::stdio::{impl#18}::write_fmt () at library/std/src/io/stdio.rs:921
#8  std::io::stdio::print_to<std::io::stdio::Stderr> () at library/std/src/io/stdio.rs:1020
#9  std::io::stdio::_eprint () at library/std/src/io/stdio.rs:1108
#10 0x000055e31113df01 in dhat::Globals::finish (self=..., memory_output=<error reading variable: Cannot access memory at address 0x0>) at src/lib.rs:762
#11 0x000055e311094a2c in dhat::Profiler::drop_inner (memory_output=<error reading variable: Cannot access memory at address 0x0>, self=<optimized out>)

Not sure what to make of it. I'm using a local fork of dhat with eprintln! removed as a workaround - seem to work.