Notice (2018-05-24): bugzilla.xamarin.com is now in
Please join us on
Visual Studio Developer Community and in the
Mono organizations on
GitHub to continue tracking issues. Bugzilla will remain
available for reference in read-only mode. We will continue to work
on open Bugzilla bugs, copy them to the new locations
as needed for follow-up, and add the new items under Related
Our sincere thanks to everyone who has contributed on this bug
tracker over the years. Thanks also for your understanding as we
make these adjustments and improvements for the future.
Please create a new report on
GitHub or Developer Community with
your current version information, steps to reproduce, and relevant error
messages or log files if you are hitting an issue that looks similar to
this resolved bug and you do not yet see a matching new report.
Created attachment 9560 [details]
Compile & run attached test case.
* Execution hangs.
* Execution completes (this is the expected behavior, this usually happens when the app exits before the background threads has started).
* Random crashes.
Created attachment 9561 [details]
Assortion of logs (zipped)
All the threads seem to be stuck here:
#0 0x00007fff8c236716 in __psynch_cvwait ()
#1 0x00007fff8eaf5c3b in _pthread_cond_wait ()
#2 0x000000010f8b62f6 in _wapi_handle_timedwait_signal_handle (handle=0x16a, timeout=0x0, alertable=1, poll=0) at handles.c:1617
#3 0x000000010f8b638d in _wapi_handle_wait_signal_handle (handle=0x16a, alertable=1) at handles.c:1562
#4 0x000000010f8d08e3 in wapi_WaitForSingleObjectEx (handle=0x16a, timeout=4294967295, alertable=1) at wait.c:194
#5 0x000000010f813e9b in mono_monitor_try_enter_internal (obj=0x110c05700, ms=4294967295, allow_interruption=1) at monitor.c:665
#6 0x000000010f814434 in ves_icall_System_Threading_Monitor_Monitor_try_enter_with_atomic_var (obj=0x110c05700, ms=4294967295, lockTaken=0x1244e38b0 "") at monitor.c:866
#7 0x000000010f8144cf in mono_monitor_enter_v4 (obj=0x110c05700, lock_taken=0x1244e38b0 "") at monitor.c:881
#8 0x000000010f60ec21 in mono_monitor_enter_v4_trampoline (regs=0x1244e37e8, code=0x110bbb293 "I?E(H??H?u?H?U?H?", obj=0x110c05700, tramp=0x110b775d5 "?F\024??\004") at mini-trampolines.c:970
I cannot reproduce with Mono 220.127.116.11 (master/798c5efa52a). I ran it in a loop ~200 times and it didn't hang nor crash.