id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,mlocked 13156,radio channels: mythfrontend hang (endless loop) when exiting 'LiveTV' and delays on switching channels,Stephan Suerken ,,"Hi! When entering 'LiveTV' on a preselected (DVB-S) audio-only channel, exiting 'LiveTV' consistently ends in an endless loop, hanging mythfrontend. Note that when entering 'LiveTV' and then '''switching the channel''' to some audio-only channel, exiting 'LiveTV' suprisingly '''will''' work. I however always notice a huge delay (~10s) when switching from an audio-only to some other channel. For the switching delay, the relevant code is in a loop in `MythPlayer::PauseDecoder()` and `MythPlayer::UnpauseDecoder()`; this has a 'max tries protector', so this eventually works. For the hang, the relevant code is in a loop in `MythPlayer::SetDecoder()`; this one has no 'max tries protector', so it hangs mythfrontend (audio is happily playing on). So afaiu, maybe `PauseDecoder()` can't actually pause (but this is ignored after some delay), and then later `SetDecoder()` can't get a lock, and that is not ignored (?). Fwiw1, this is how I can reproduce this, always, on 29-fixes (ed4356116a), several frontend installations, various hardware (backend using DVB-S/Astra): 1. start mythfrontend, enter 'LiveTV'. 2. Switch to an audio-only (radio) channel. 3. Leave and re-enter 'LiveTV' (will now play that preselected radio channel). 4. Leave 'LiveTV' (Esc) => HANG. mythfrontend can only be killed to fix this. Fwiw2, on hang, the log repeated forever is {{{ 2017-10-18 15:51:42.714971 I Player(0): Waited 10ms for decoder lock }}} and strace shows the attempts on locking forever {{{ futex(0x557461a1ec38, FUTEX_WAIT_PRIVATE, 3, {tv_sec=0, tv_nsec=10000000}) = -1 ETIMEDOUT (Connection timed out) }}} Fwiw3 ;), this not a new problem, I remember having similar problems at least with 0.28. Thx! S",Bug Report - Hang/Deadlock,closed,minor,needs_triage,MythTV - General,Master Head,medium,Trac EOL,radio audio dvb-s,,0