Attempt to start app fails now, gdb says:
```
245 (0xffff8000042ca040) /libhttpserver. cpu0 waiting
sched::thread::join() at core/sched.cc:1310 vruntime 6.97405e-18
joining on 0xffff8000042ca040
```
Httpserver selfdestruction attempt failed ;)
I guess the magic "a->runtime().use_count() == 3" is not good enough in
this particular case.
```
(gdb) osv thr 245
(gdb) bt
#0 sched::thread::switch_to (this=0xffff800001d85040) at
arch/x64/arch-switch.hh:75
#1 0x00000000005ba7de in sched::cpu::reschedule_from_interrupt
(this=0xffff8000017bb040, called_from_yield=false, preempt_after=...) at
core/sched.cc:339
#2 0x00000000005ba042 in sched::cpu::schedule () at core/sched.cc:228
#3 0x00000000005bdd79 in sched::thread::wait (this=0xffff800004220040) at
core/sched.cc:1213
#4 0x00000000005c2b59 in
sched::thread::do_wait_until<sched::noninterruptible,
sched::thread::dummy_lock,
sched::thread::join()::__lambda18>(sched::thread::dummy_lock &,
sched::thread::__lambda18) (mtx=..., pred=...) at include/osv/sched.hh:1052
#5 0x00000000005c1687 in
sched::thread::wait_until<sched::thread::join()::__lambda18>(sched::thread::__lambda18)
(pred=...) at include/osv/sched.hh:1063
#6 0x00000000005be0f2 in sched::thread::join (this=0xffff800004220040) at
core/sched.cc:1310
#7 0x000000000068a308 in pthread_private::pthread::join
(this=0xffffa000020d27b0, retval=0x0) at libc/pthread.cc:156
#8 0x000000000068a71b in pthread_join (thread=18446638520627701680,
retval=0x0) at libc/pthread.cc:245
#9 0x00000000006239a4 in osv::application::join (this=0xffffa00002103f18)
at core/app.cc:249
#10 0x0000000000622a60 in osv::app_registry::join_terminated
(this=0x149e440 <osv::application::apps>) at core/app.cc:72
#11 0x000000000062838b in osv::application::join_terminated () at
include/osv/app.hh:105
#12 0x0000000000623016 in osv::run_background (args=std::vector of length
2, capacity 2 = {...}) at core/app.cc:158
#13 0x0000100000ca1cbf in exec_app (cmnd_line="/sleep.so 5") at
api/app.cc:39
...
```
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