Hi Kuninori, I'm responding to my own mail, since I didn't received yours for some reason but I still saw your response in mailing list archive. Dne sreda, 28. februar 2018 ob 22:02:09 CET je Jernej Škrabec napisal(a): > Hi all, > > with todays linux-next (next-20180228), kernel on Allwinner H3 SoC crashes > with dmesg like that: https://pastebin.com/raw/0D5JeaJ8 > > I bisected the kernel and first offending commit is: > be7ee5f32a9a ("ASoC: soc-generic-dmaengine-pcm: replace platform to > component") > > I know that crash message is completely unrelated to sound subsystem, but it > turns out that if I disable CONFIG_SND_SUN4I_CODEC kernel works ok, but > this way I lose analog audio output. > > Any suggestions what can be the issue? I did a bit of research and I can tell you that different kernel options (some drivers added or removed) change how or where kernel crashes. That would suggest some kind of memory corruption. I removed parts of the code from the sun4i codec driver and interestingly it doesn't crash if I remove following lines: ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); if (ret) { dev_err(&pdev->dev, "Failed to register against DMAEngine\n"); goto err_assert_reset; } Is it possible that NULL pointer causes troubles somewhere down the line? I tested this on linux-next, next-20180228 tag. Best regards, Jernej _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
