[haiku-bugs] Re: [Haiku] #3085: [Sounds] crashes after playing the event sounds consecutively.
- From: "ttcoder" <trac@xxxxxxxxxxxx>
- Date: Mon, 19 Aug 2013 17:26:32 -0000
#3085: [Sounds] crashes after playing the event sounds consecutively.
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Reporter: richienyhus | Owner: mmu_man
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Preferences/Sounds | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: x86
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Comment (by ttcoder):
Regarding {{{ Component: Preferences/Sounds}}},
In hrev45824 I witnessed just now a call to system_beep() (specifically,
in BeShare) going "click" (brief click then silence, instead of playing
the sound).. Went to Preferences/Sounds immediately, but when I selected
the corresponding line and clicked "Play" it worked fine. A couple years
ago it used to crash as described above. If memory serves, there has been
changes in the media-kit but not in "Sounds" since that time, so it seems
the MK was the culprit and has much improved since then.
There's a possibility the remaining problem is not in Sounds but rather in
the MK implementation of system_beep(). I base that on a MK vulnerability
I discovered recently (still have to file a ticket): if playing a sound in
a certain way, one may block the media_server, such that all applications
accessing it are "frozen". After some digging I found out that my code had
to use {{{Preroll()}}} and call {{{BSoundPlayer::Stop()}}} before ever
{{{delete}}}ing it (not sure which one of these two fixed it, but the
vulnerability is fixed now). So the MK is a bit sensitive to the order in
which functions are called to access it. If it can trigger a freeze, it
can trigger a "click" or the old crash in older, more vulnerable versions.
Maybe system_beep() (as presumably used in Sounds) forgets to call
{{{Stop()}}} before recycling the BSoundPlayer, or something like that.
--
Ticket URL: <http://dev.haiku-os.org/ticket/3085#comment:13>
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