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Message-ID: <s5hbndvmqb9.wl-tiwai@suse.de>
Date: Tue, 25 Aug 2015 15:48:58 +0200
From: Takashi Iwai <tiwai@...e.de>
To: "Alexnader Kuleshov" <kuleshovmail@...il.com>
Cc: "Jaroslav Kysela" <perex@...ex.cz>, <alsa-devel@...a-project.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: ALSA/usb-audio: snd_usb_autoresume possible recursive locking detected
On Tue, 25 Aug 2015 15:32:56 +0200,
Alexnader Kuleshov wrote:
>
> Hello all,
>
> Today I've update to 4.2.0-rc8+ and started to get following lines in the
> dmesg output:
>
> [ 13.884092] =============================================
> [ 13.884092] [ INFO: possible recursive locking detected ]
> [ 13.884094] 4.2.0-rc8+ #61 Not tainted
> [ 13.884094] ---------------------------------------------
> [ 13.884095] pulseaudio/980 is trying to acquire lock:
> [ 13.884096] (&chip->shutdown_rwsem){.+.+.+}, at: [<ffffffffa0355dac>] snd_usb_autoresume+0x1d/0x52 [snd_usb_audio]
> [ 13.884103]
> but task is already holding lock:
> [ 13.884104] (&chip->shutdown_rwsem){.+.+.+}, at: [<ffffffffa0355dac>] snd_usb_autoresume+0x1d/0x52 [snd_usb_audio]
> [ 13.884107]
> other info that might help us debug this:
> [ 13.884108] Possible unsafe locking scenario:
>
> [ 13.884109] CPU0
> [ 13.884110] ----
> [ 13.884110] lock(&chip->shutdown_rwsem);
> [ 13.884111] lock(&chip->shutdown_rwsem);
> [ 13.884112]
> *** DEADLOCK ***
>
> [ 13.884113] May be due to missing lock nesting notation
>
> [ 13.884114] 2 locks held by pulseaudio/980:
> [ 13.884115] #0: (&pcm->open_mutex){+.+.+.}, at: [<ffffffffa02ac9bc>] snd_pcm_open+0xa9/0x1f8 [snd_pcm]
> [ 13.884120] #1: (&chip->shutdown_rwsem){.+.+.+}, at: [<ffffffffa0355dac>] snd_usb_autoresume+0x1d/0x52 [snd_usb_audio]
> [ 13.884124]
> stack backtrace:
> [ 13.884125] CPU: 0 PID: 980 Comm: pulseaudio Not tainted 4.2.0-rc8+ #61
> [ 13.884126] Hardware name: Gigabyte Technology Co., Ltd. Z97X-UD5H-BK/Z97X-UD5H-BK, BIOS F6 06/17/2014
> [ 13.884127] 0000000000000000 000000003d4c66e6 ffff88040897b4d8 ffffffff815ba622
> [ 13.884129] 0000000000000000 ffffffff82399320 ffff88040897b598 ffffffff810dd54e
> [ 13.884130] ffff88040ac486a8 0000000000000000 0000000000000001 ffffffff82399320
> [ 13.884132] Call Trace:
> [ 13.884134] [<ffffffff815ba622>] dump_stack+0x4c/0x65
> [ 13.884137] [<ffffffff810dd54e>] validate_chain.isra.9+0x75d/0xf59
> [ 13.884139] [<ffffffff815c62b3>] ? _raw_spin_unlock_irq+0x28/0x34
> [ 13.884140] [<ffffffff810e0964>] __lock_acquire+0x753/0xabf
> [ 13.884142] [<ffffffff81163819>] ? kfree+0xb8/0x10d
> [ 13.884143] [<ffffffff810e1131>] lock_acquire+0x7b/0x9c
> [ 13.884146] [<ffffffffa0355dac>] ? snd_usb_autoresume+0x1d/0x52 [snd_usb_audio]
> [ 13.884147] [<ffffffff815c4896>] down_read+0x44/0x8d
> [ 13.884150] [<ffffffffa0355dac>] ? snd_usb_autoresume+0x1d/0x52 [snd_usb_audio]
> [ 13.884152] [<ffffffffa0355dac>] snd_usb_autoresume+0x1d/0x52 [snd_usb_audio]
> [ 13.884153] [<ffffffff815c37e5>] ? __mutex_unlock_slowpath+0x110/0x11b
> [ 13.884156] [<ffffffffa0359338>] snd_usb_mixer_set_ctl_value+0x9a/0x16d [snd_usb_audio]
> [ 13.884159] [<ffffffffa035957e>] snd_usb_set_cur_mix_value+0x4d/0x77 [snd_usb_audio]
> [ 13.884161] [<ffffffffa0359db9>] restore_mixer_value+0x74/0x87 [snd_usb_audio]
> [ 13.884164] [<ffffffffa035b581>] snd_usb_mixer_resume+0x64/0x70 [snd_usb_audio]
> [ 13.884166] [<ffffffffa035505c>] __usb_audio_resume+0x5c/0xd8 [snd_usb_audio]
> [ 13.884169] [<ffffffff81413ca4>] ? usb_runtime_suspend+0x63/0x63
> [ 13.884171] [<ffffffffa03550e6>] usb_audio_reset_resume+0xe/0x10 [snd_usb_audio]
> [ 13.884172] [<ffffffff81412fde>] usb_resume_interface.isra.1+0x6c/0xbd
> [ 13.884174] [<ffffffff814130cf>] usb_resume_both+0xa0/0xc0
> [ 13.884175] [<ffffffff81413cb9>] usb_runtime_resume+0x15/0x17
> [ 13.884178] [<ffffffff813b92b0>] __rpm_callback+0x35/0x5d
> [ 13.884179] [<ffffffff81413ca4>] ? usb_runtime_suspend+0x63/0x63
> [ 13.884180] [<ffffffff813b9330>] rpm_callback+0x58/0x77
> [ 13.884182] [<ffffffff81413ca4>] ? usb_runtime_suspend+0x63/0x63
> [ 13.884183] [<ffffffff813ba0db>] rpm_resume+0x370/0x412
> [ 13.884184] [<ffffffff813ba06c>] rpm_resume+0x301/0x412
> [ 13.884186] [<ffffffff813ba1e3>] __pm_runtime_resume+0x66/0x82
> [ 13.884187] [<ffffffff81412e10>] usb_autopm_get_interface+0x1e/0x48
> [ 13.884190] [<ffffffffa0355dcc>] snd_usb_autoresume+0x3d/0x52 [snd_usb_audio]
> [ 13.884191] [<ffffffff810d84b9>] ? __init_waitqueue_head+0x37/0x4b
> [ 13.884194] [<ffffffffa035e765>] snd_usb_pcm_open+0x181/0x3bb [snd_usb_audio]
> [ 13.884197] [<ffffffffa035e9ad>] snd_usb_capture_open+0xe/0x10 [snd_usb_audio]
> [ 13.884200] [<ffffffffa02ac8c6>] snd_pcm_open_substream+0x50/0x9d [snd_pcm]
> [ 13.884203] [<ffffffffa02ac9ce>] snd_pcm_open+0xbb/0x1f8 [snd_pcm]
> [ 13.884204] [<ffffffff810de87d>] ? trace_hardirqs_on+0xd/0xf
> [ 13.884206] [<ffffffff810c5550>] ? wake_up_q+0x53/0x53
> [ 13.884209] [<ffffffffa02acb49>] snd_pcm_capture_open+0x3e/0x61 [snd_pcm]
> [ 13.884212] [<ffffffffa028232d>] snd_open+0x130/0x13f [snd]
> [ 13.884214] [<ffffffff811788c5>] chrdev_open+0x13b/0x175
> [ 13.884215] [<ffffffff8117878a>] ? cdev_put+0x20/0x20
> [ 13.884217] [<ffffffff81172f31>] do_dentry_open.isra.1+0x1d2/0x2c9
> [ 13.884218] [<ffffffff8117d0e4>] ? __inode_permission+0x84/0x95
> [ 13.884219] [<ffffffff81173bf6>] vfs_open+0x50/0x54
> [ 13.884221] [<ffffffff811815e0>] path_openat+0xa90/0xd0f
> [ 13.884222] [<ffffffff810e0900>] ? __lock_acquire+0x6ef/0xabf
> [ 13.884223] [<ffffffff8118269e>] do_filp_open+0x48/0xac
> [ 13.884225] [<ffffffff815c6203>] ? _raw_spin_unlock+0x23/0x2e
> [ 13.884227] [<ffffffff8118f5b7>] ? __alloc_fd+0x144/0x156
> [ 13.884228] [<ffffffff81173f3a>] do_sys_open+0x154/0x1f7
> [ 13.884229] [<ffffffff81173ff6>] SyS_open+0x19/0x1b
> [ 13.884231] [<ffffffff815c6a57>] entry_SYSCALL_64_fastpath+0x12/0x6f
>
> Previous version of the kernel was 4.2.0-rc6+.
This should be a false positive warning, a side-effect now by fix of
runtime PM. That is, it proves that the runtime PM is activated.
I'll consider to reduce this later.
thanks,
Takashi
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