When it was stuck, I got this out from gdb info threads: Program received signal SIGINT, Interrupt. 0xf67466ba in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 (gdb) info threads Id Target Id Frame 44 Thread 0xda61b410 (LWP 4885) "unity8-dash" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 43 Thread 0xd3eff410 (LWP 4992) "unity8-dash" 0xf6788132 in epoll_wait () from /lib/arm-linux-gnueabihf/libc.so.6 42 Thread 0xd36ff410 (LWP 5042) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 41 Thread 0xf332a410 (LWP 3287) "RPC Thread" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 40 Thread 0xf16c7410 (LWP 3628) "mali-mem-purge" 0xf4947c64 in ?? () 39 Thread 0xf0ec7410 (LWP 3629) "mali-event-hnd" 0xf4947b1c in ?? () 38 Thread 0xf06c7410 (LWP 3630) "mali-utility-wo" 0xf4920484 in ?? () 37 Thread 0xefec7410 (LWP 3631) "mali-utility-wo" 0xf4920484 in ?? () 36 Thread 0xef6c7410 (LWP 3632) "mali-utility-wo" 0xf4920484 in ?? () 35 Thread 0xeeec7410 (LWP 3633) "mali-utility-wo" 0xf4920484 in ?? () 34 Thread 0xee6c7410 (LWP 3634) "mali-renderer" 0xf4920484 in ?? () 33 Thread 0xed4ff410 (LWP 3636) "ged-swd" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 32 Thread 0xecaba410 (LWP 3637) "QQmlThread" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 31 Thread 0xea5ff410 (LWP 3648) "Qt bearer threa" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 30 Thread 0xe9cff410 (LWP 3649) "QProcessManager" 0xf67833e2 in select () from /lib/arm-linux-gnueabihf/libc.so.6 29 Thread 0xe8761410 (LWP 3651) "QQuickPixmapRea" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 28 Thread 0xe7596410 (LWP 3657) "Input dispatch" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 27 Thread 0xe6d96410 (LWP 3668) "QSGRenderThread" 0xf1b074f0 in ?? () 26 Thread 0xe4d2e410 (LWP 3673) "Qt HTTP thread" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 24 Thread 0xe352e410 (LWP 3676) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 23 Thread 0xe2d2e410 (LWP 3677) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 22 Thread 0xe252e410 (LWP 3678) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 21 Thread 0xe1d2e410 (LWP 3679) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 20 Thread 0xe152e410 (LWP 3680) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 19 Thread 0xe0d2e410 (LWP 3681) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 18 Thread 0xe052e410 (LWP 3682) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 17 Thread 0xdfd2e410 (LWP 3683) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 16 Thread 0xdf52e410 (LWP 3684) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 15 Thread 0xded2e410 (LWP 3685) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 14 Thread 0xde52e410 (LWP 3686) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 13 Thread 0xddd2e410 (LWP 3687) "scopes_ng::Scop" 0xf6788132 in epoll_wait () from /lib/arm-linux-gnueabihf/libc.so.6 12 Thread 0xdd52e410 (LWP 3688) "scopes_ng::Scop" 0xf6788132 in epoll_wait () from /lib/arm-linux-gnueabihf/libc.so.6 11 Thread 0xe452e410 (LWP 3710) "unity8-dash" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 10 Thread 0xdbc2c410 (LWP 3711) "unity8-dash" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 9 Thread 0xd8f8a410 (LWP 3752) "dconf worker" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 8 Thread 0xd878a410 (LWP 3753) "gdbus" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 6 Thread 0xd7dff410 (LWP 4006) "unity8-dash" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 5 Thread 0xd75ff410 (LWP 4007) "unity8-dash" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 4 Thread 0xd6dff410 (LWP 4008) "unity8-dash" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 3 Thread 0xd65ff410 (LWP 4009) "unity8-dash" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 2 Thread 0xd1484410 (LWP 4051) "Qt HTTP thread" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 * 1 Thread 0xf737b220 (LWP 3262) "unity8-dash" (Exiting) 0xf67466ba in ?? () from /lib/arm-linux-gnueabihf/libc.so.6 (gdb) c Continuing. ^C Program received signal SIGINT, Interrupt. 0xecbb71f8 in QQuickItem::setY(double) () from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5 (gdb) info threads Id Target Id Frame 44 Thread 0xda61b410 (LWP 4885) "unity8-dash" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 43 Thread 0xd3eff410 (LWP 4992) "unity8-dash" 0xf6788132 in epoll_wait () from /lib/arm-linux-gnueabihf/libc.so.6 42 Thread 0xd36ff410 (LWP 5042) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 41 Thread 0xf332a410 (LWP 3287) "RPC Thread" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 40 Thread 0xf16c7410 (LWP 3628) "mali-mem-purge" 0xf4947c64 in ?? () 39 Thread 0xf0ec7410 (LWP 3629) "mali-event-hnd" 0xf4947b1c in ?? () 38 Thread 0xf06c7410 (LWP 3630) "mali-utility-wo" 0xf4920484 in ?? () 37 Thread 0xefec7410 (LWP 3631) "mali-utility-wo" 0xf4920484 in ?? () 36 Thread 0xef6c7410 (LWP 3632) "mali-utility-wo" 0xf4920484 in ?? () 35 Thread 0xeeec7410 (LWP 3633) "mali-utility-wo" 0xf4920484 in ?? () 34 Thread 0xee6c7410 (LWP 3634) "mali-renderer" 0xf4920484 in ?? () 33 Thread 0xed4ff410 (LWP 3636) "ged-swd" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 32 Thread 0xecaba410 (LWP 3637) "QQmlThread" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 31 Thread 0xea5ff410 (LWP 3648) "Qt bearer threa" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 30 Thread 0xe9cff410 (LWP 3649) "QProcessManager" 0xf67833e2 in select () from /lib/arm-linux-gnueabihf/libc.so.6 29 Thread 0xe8761410 (LWP 3651) "QQuickPixmapRea" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 28 Thread 0xe7596410 (LWP 3657) "Input dispatch" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 27 Thread 0xe6d96410 (LWP 3668) "QSGRenderThread" 0xf6782d04 in ioctl () from /lib/arm-linux-gnueabihf/libc.so.6 26 Thread 0xe4d2e410 (LWP 3673) "Qt HTTP thread" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 24 Thread 0xe352e410 (LWP 3676) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 23 Thread 0xe2d2e410 (LWP 3677) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 22 Thread 0xe252e410 (LWP 3678) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 21 Thread 0xe1d2e410 (LWP 3679) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 20 Thread 0xe152e410 (LWP 3680) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 19 Thread 0xe0d2e410 (LWP 3681) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 18 Thread 0xe052e410 (LWP 3682) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 17 Thread 0xdfd2e410 (LWP 3683) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 16 Thread 0xdf52e410 (LWP 3684) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 15 Thread 0xded2e410 (LWP 3685) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 14 Thread 0xde52e410 (LWP 3686) "scopes_ng::Scop" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 13 Thread 0xddd2e410 (LWP 3687) "scopes_ng::Scop" 0xf6788132 in epoll_wait () from /lib/arm-linux-gnueabihf/libc.so.6 12 Thread 0xdd52e410 (LWP 3688) "scopes_ng::Scop" 0xf6788132 in epoll_wait () from /lib/arm-linux-gnueabihf/libc.so.6 11 Thread 0xe452e410 (LWP 3710) "unity8-dash" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 10 Thread 0xdbc2c410 (LWP 3711) "unity8-dash" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 9 Thread 0xd8f8a410 (LWP 3752) "dconf worker" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 8 Thread 0xd878a410 (LWP 3753) "gdbus" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 6 Thread 0xd7dff410 (LWP 4006) "unity8-dash" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 5 Thread 0xd75ff410 (LWP 4007) "unity8-dash" 0xf66edd44 in __libc_do_syscall () from /lib/arm-linux-gnueabihf/libpthread.so.0 4 Thread 0xd6dff410 (LWP 4008) "unity8-dash" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 3 Thread 0xd65ff410 (LWP 4009) "unity8-dash" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 2 Thread 0xd1484410 (LWP 4051) "Qt HTTP thread" 0xf67814e0 in poll () from /lib/arm-linux-gnueabihf/libc.so.6 * 1 Thread 0xf737b220 (LWP 3262) "unity8-dash" (Exiting) 0xecbb71f8 in QQuickItem::setY(double) () from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5 So it wasn't really stuck, but looping somewhere and leaking memory.