| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <3CA6C6D9F70D314CA34352990B57DA1507C420F147@bgsmsx502.gar.corp.intel.com> Date: Mon, 5 Sep 2011 23:08:53 +0530 From: "Nallasellan, Singaravelan" <singaravelan.nallasellan@...el.com> To: "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Player Thread is not woken after period elapsed Hi, When I tried to root cause a glitch in the audio playback, I found a weird behavior. User thread which invokes the writei function which in turn invokes a kernel function which waits for the free buffer to write the audio data. This kernel function adds this thread to a wake(sleep) queue and calls a schedule_timeout (msecs_to_jiffies(10000)). When the audio playback of a period is completed, the hardware generates an interrupt. The handler in the path wake_up the thread added to the sleep queue. Most of the time, the playback thread is woken up. During this error case, the thread is not getting woken up. However the sleep queue is not empty. This continues until the playback enter into underrun due to all the periods in the buffer are played back. Audio playback continues after recovery from xrun. Will you provide some hint on how to go about identifying the root cause? Thanks -Sing -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists