Messages in this thread | | | From | Linus Torvalds <> | Date | Fri, 2 Jul 2021 18:36:38 -0700 | Subject | Re: [GIT PULL] sound updates for 5.14-rc1 |
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On Fri, Jul 2, 2021 at 1:29 AM Takashi Iwai <tiwai@suse.de> wrote: > > git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git tags/sound-5.14-rc1
After incorrectly suspecting Andrew's -mm tree (because the kernel hung with a watchdog on TLB flushing, and so I suspected mm problems), I've now bisected my hung machine into the sound tree.
And in fact, I have a couple of NMI backtraces that point very directly at the sound code, and a couple of the hung cores had stack traces like this:
Call Trace: _raw_spin_lock_irqsave+0x35/0x40 snd_pcm_period_elapsed+0x1b/0xa0 [snd_pcm] snd_complete_urb+0x119/0x580 [snd_usb_audio] __usb_hcd_giveback_urb+0xb2/0x100 usb_giveback_urb_bh+0xaf/0xd0 tasklet_action_common+0xe0/0x160 __do_softirq+0x142/0x296 __irq_exit_rcu+0xc5/0xf0 common_interrupt+0x78/0x90
Call Trace: _raw_spin_lock_irqsave+0x35/0x40 snd_pcm_period_elapsed+0x1b/0xa0 [snd_pcm] snd_usb_endpoint_start+0x1a0/0x3c0 [snd_usb_audio] start_endpoints+0x23/0x90 [snd_usb_audio] snd_usb_substream_playback_trigger+0x7b/0x1a0 [snd_usb_audio] snd_pcm_common_ioctl+0x1c44/0x2360 [snd_pcm] snd_pcm_ioctl+0x2e/0x40 [snd_pcm] __se_sys_ioctl+0x72/0xc0 do_syscall_64+0x4c/0xa0 entry_SYSCALL_64_after_hwframe+0x44/0xae
so it looks like it's that
snd_pcm_stream_lock_irqsave(substream, flags);
that hangs. Presumably somebody has forgotten to unlock a spinlock they took.
I'll continue bisecting, but this is on my AMD Gigabyte TRX30 Aorus Master board, which has that internal USB-Audio too, but what I actually use is that external USB Audioengine 2
0 [Headphone ]: USB-Audio - Aorus Master Front Headphone Gigabyte-Aorus-Master-Front-Headphone 1 [Generic ]: HDA-Intel - HD-Audio Generic HD-Audio Generic at 0xfa200000 irq 156 2 [HDMI ]: HDA-Intel - HDA ATI HDMI HDA ATI HDMI at 0xe1c60000 irq 158 3 [A2 ]: USB-Audio - Audioengine 2 Audioengine Ltd. Audioengine 2 at usb-0000:03:00.3-2.3, full speed 4 [Audio ]: USB-Audio - Aorus Master Main Audio Gigabyte-Aorus-Master-Main-Audio
does a hung spinlock make anybody go "Oh, I know!"
My bisect will hopefully have it narrowed down more soon enough. Knock wood.
Linus
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