linux-kernel - Re: debug_dma_assert_idle - ahci - cpu touching an active dma mapped cacheline

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Date:	Sat, 30 Aug 2014 02:48:29 +0200
From:	poma <pomidorabelisima@...il.com>
To:	Linux Kernel list <linux-kernel@...r.kernel.org>
CC:	Takashi Iwai <tiwai@...e.de>, Clemens Ladisch <clemens@...isch.de>,
	Mailing-List fedora-kernel <kernel@...ts.fedoraproject.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sander Eikelenboom <linux@...elenboom.it>,
	Dave Jones <davej@...hat.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Francois Romieu <romieu@...zoreil.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Wei Liu <wei.liu2@...rix.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: debug_dma_assert_idle - ahci - cpu touching an active dma mapped
 cacheline

On 11.05.2014 12:02, poma wrote:
> 
> ------------[ cut here ]------------
> WARNING: CPU: 2 PID: 628 at lib/dma-debug.c:593 debug_dma_assert_idle+0x159/0x1d0()
> snd_hda_intel 0000:00:07.0: DMA-API: cpu touching an active dma mapped cacheline [cln=0x03074000]
> CPU: 2 PID: 628 Comm: lightdm Not tainted 3.15.0-0.rc5.git0.1.fc21.i686+debug #1
> Call Trace:
>  [<c0ae737d>] dump_stack+0x48/0x60
>  [<c04547b2>] warn_slowpath_common+0x82/0xa0
>  [<c0754d99>] ? debug_dma_assert_idle+0x159/0x1d0
>  [<c0754d99>] ? debug_dma_assert_idle+0x159/0x1d0
>  [<c045480e>] warn_slowpath_fmt+0x3e/0x60
>  [<c0754d99>] debug_dma_assert_idle+0x159/0x1d0
>  [<c058a149>] ? anon_vma_prepare+0x29/0x140
>  [<c057e56e>] do_wp_page+0xce/0x890
>  [<c0580b72>] handle_mm_fault+0x662/0xb70
>  [<c0af3667>] __do_page_fault+0x1a7/0x5d0
>  [<c04e1057>] ? SyS_futex+0x97/0x180
>  [<c04b1b00>] ? trace_hardirqs_on_caller+0x1c0/0x1e0
>  [<c04b1a7c>] ? trace_hardirqs_on_caller+0x13c/0x1e0
>  [<c0af3a90>] ? __do_page_fault+0x5d0/0x5d0
>  [<c0af3aaa>] do_page_fault+0x1a/0x20
>  [<c0af0484>] error_code+0x6c/0x74
> ---[ end trace b400a64c04aed387 ]---
> Mapped at:
>  [<c0752e42>] debug_dma_alloc_coherent+0x22/0x70
>  [<f80c3e90>] snd_dma_alloc_pages+0x170/0x260 [snd_pcm]
>  [<f80c3fe2>] snd_dma_alloc_pages_fallback+0x62/0x90 [snd_pcm]
>  [<f80c43b0>] snd_malloc_sgbuf_pages+0xf0/0x211 [snd_pcm]
>  [<f80c3f23>] snd_dma_alloc_pages+0x203/0x260 [snd_pcm]
> 

------------[ cut here ]------------
WARNING: CPU: 1 PID: 1180 at lib/dma-debug.c:593 debug_dma_assert_idle+0x159/0x1d0()
ahci 0000:00:09.0: DMA-API: cpu touching an active dma mapped cacheline [cln=0x03001000]
Modules linked in: ip6t_rpfilter ip6t_REJECT xt_conntrack cfg80211 rfkill ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw mt7601Usta(OE) nouveau kvm_amd ata_generic kvm uas pata_acpi ppdev mxm_wmi parport_serial video usb_storage k10temp r8169 i2c_algo_bit ttm drm_kms_helper serio_raw microcode parport_pc skge parport mii drm wmi i2c_nforce2 i2ccore pata_amd acpi_cpufreq sunrpc
CPU: 1 PID: 1180 Comm: gmain Tainted: G           OE  3.17.0-0.rc2.git3.1.fc22.i686 #1
...
Call Trace:
 [<c0b137d8>] dump_stack+0x48/0x60
 [<c0459092>] warn_slowpath_common+0x82/0xa0
 [<c076c1e9>] ? debug_dma_assert_idle+0x159/0x1d0
 [<c076c1e9>] ? debug_dma_assert_idle+0x159/0x1d0
 [<c04590ee>] warn_slowpath_fmt+0x3e/0x60
 [<c076c1e9>] debug_dma_assert_idle+0x159/0x1d0
 [<c059b8a9>] ? anon_vma_prepare+0x29/0x140
 [<c0590524>] do_wp_page+0xe4/0x8c0
 [<c0592722>] handle_mm_fault+0x662/0xba0
 [<c0447237>] ? __do_page_fault+0x1a7/0x5d0
 [<c0447298>] __do_page_fault+0x208/0x5d0
 [<c058ebd1>] ? might_fault+0x51/0xb0
 [<c058ec27>] ? might_fault+0xa7/0xb0
 [<c074dbb0>] ? _copy_to_user+0x40/0x60
 [<c0447660>] ? __do_page_fault+0x5d0/0x5d0
 [<c044767a>] do_page_fault+0x1a/0x20
 [<c0b1d2b4>] error_code+0x6c/0x74
---[ end trace d1e2e0e42481c1e4 ]---
Mapped at:
 [<c076a292>] debug_dma_alloc_coherent+0x22/0x70
 [<c0867cbb>] dmam_alloc_coherent+0xdb/0x130
 [<c08b798d>] ahci_port_start+0xed/0x230
 [<c089d23b>] ata_host_start.part.24+0xcb/0x1b0
 [<c08a2a35>] ata_host_activate+0x45/0x100

ahci:
00:09.0 SATA controller: NVIDIA Corporation MCP78S [GeForce 8200] AHCI Controller (rev a2)
and
snd_hda_intel:
00:07.0 Audio device: NVIDIA Corporation MCP72XE/MCP72P/MCP78U/MCP78S High Definition Audio (rev a1)
swapped the roles. :)
mt7601Usta is irrelevant as tainter, here.


poma



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