poma wrote: ??? "Coherent" means "touching DMA mappings is allowed". Why does dma-debug complain about that? Regards, Clemens

This one comes and goes... ------------[ cut here ]------------ WARNING: CPU: 2 PID: 521 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=0x03019000] ------------[ cut here ]------------ WARNING: CPU: 3 PID: 927 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=0x03019000] CPU: 3 PID: 927 Comm: firewalld Not tainted 3.15.0-0.rc2.git1.1.fc21.i686 #1 Call Trace: [<c0ae29dd>] dump_stack+0x48/0x60 [<c0454402>] warn_slowpath_common+0x82/0xa0 [<c0750e09>] ? debug_dma_assert_idle+0x159/0x1d0 [<c0750e09>] ? debug_dma_assert_idle+0x159/0x1d0 [<c045445e>] warn_slowpath_fmt+0x3e/0x60 [<c0750e09>] debug_dma_assert_idle+0x159/0x1d0 [<c0586189>] ? anon_vma_prepare+0x29/0x140 [<c057a5be>] do_wp_page+0xce/0x890 [<c0640065>] ? ext4_releasepage+0x95/0x130 [<c057cbc2>] handle_mm_fault+0x662/0xb70 [<c0640065>] ? ext4_releasepage+0x95/0x130 [<c0aee997>] __do_page_fault+0x1a7/0x5d0 [<c04adcac>] ? trace_hardirqs_on_caller+0x13c/0x1e0 [<c04ff83c>] ? __audit_syscall_entry+0x8c/0xe0 [<c04add5b>] ? trace_hardirqs_on+0xb/0x10 [<c04adcac>] ? trace_hardirqs_on_caller+0x13c/0x1e0 [<c04adcac>] ? trace_hardirqs_on_caller+0x13c/0x1e0 [<c0aeedc0>] ? __do_page_fault+0x5d0/0x5d0 [<c0aeedda>] do_page_fault+0x1a/0x20 [<c0aeb7b4>] error_code+0x6c/0x74 ---[ end trace 0464944e27da06b8 ]--- Mapped at: [<c074eeb2>] debug_dma_alloc_coherent+0x22/0x70 [<f839de90>] snd_dma_alloc_pages+0x170/0x260 [snd_pcm] [<f839dfe2>] snd_dma_alloc_pages_fallback+0x62/0x90 [snd_pcm] [<f839e3b0>] snd_malloc_sgbuf_pages+0xf0/0x211 [snd_pcm] [<f839df23>] snd_dma_alloc_pages+0x203/0x260 [snd_pcm] CPU: 2 PID: 521 Comm: firewalld Tainted: G W 3.15.0-0.rc2.git1.1.fc21.i686 #1 Call Trace: [<c0ae29dd>] dump_stack+0x48/0x60 [<c0454402>] warn_slowpath_common+0x82/0xa0 [<c0750e09>] ? debug_dma_assert_idle+0x159/0x1d0 [<c0750e09>] ? debug_dma_assert_idle+0x159/0x1d0 [<c045445e>] warn_slowpath_fmt+0x3e/0x60 [<c0750e09>] debug_dma_assert_idle+0x159/0x1d0 [<c0586189>] ? anon_vma_prepare+0x29/0x140 [<c057a5be>] do_wp_page+0xce/0x890 [<c0640065>] ? ext4_releasepage+0x95/0x130 [<c057cbc2>] handle_mm_fault+0x662/0xb70 [<c0640065>] ? ext4_releasepage+0x95/0x130 [<c0aee997>] __do_page_fault+0x1a7/0x5d0 [<c04ff83c>] ? __audit_syscall_entry+0x8c/0xe0 [<c04add5b>] ? trace_hardirqs_on+0xb/0x10 [<c04adcac>] ? trace_hardirqs_on_caller+0x13c/0x1e0 [<c0aeedc0>] ? __do_page_fault+0x5d0/0x5d0 [<c0aeedda>] do_page_fault+0x1a/0x20 [<c0aeb7b4>] error_code+0x6c/0x74 ---[ end trace 0464944e27da06b9 ]--- Mapped at: [<c074eeb2>] debug_dma_alloc_coherent+0x22/0x70 [<f839de90>] snd_dma_alloc_pages+0x170/0x260 [snd_pcm] [<f839dfe2>] snd_dma_alloc_pages_fallback+0x62/0x90 [snd_pcm] [<f839e3b0>] snd_malloc_sgbuf_pages+0xf0/0x211 [snd_pcm] [<f839df23>] snd_dma_alloc_pages+0x203/0x260 [snd_pcm] https://bugzilla.redhat.com/attachment.cgi?id=888686 dma debug: account for cachelines and read-only mappings in overlap tracking https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/l... Are these two in some relation? poma

$ file * linux-3.15.0-0.rc3.git1.10.fc21.i686: directory linux-3.15.0-0.rc3.git2.1.fc21.i686: directory linux-3.15.0-0.rc3.git3.1.fc21.i686: directory $ $ grep -R AZX_DCAPS_CORBRP_SELF_CLEAR linux-3.15.0-0.rc3.git3.1.fc21.i686/sound/pci/hda/hda_intel.c: AZX_DCAPS_CORBRP_SELF_CLEAR) linux-3.15.0-0.rc3.git3.1.fc21.i686/sound/pci/hda/hda_controller.c: if (!(chip->driver_caps & AZX_DCAPS_CORBRP_SELF_CLEAR)) { linux-3.15.0-0.rc3.git3.1.fc21.i686/sound/pci/hda/hda_priv.h:#define AZX_DCAPS_CORBRP_SELF_CLEAR (1 << 28) /* CORBRP clears itself after reset */ $ $ uname -r 3.15.0-0.rc3.git3.1.fc21.i686 PASSED Referent commit ALSA: hda - Suppress CORBRP clear on Nvidia controller chips https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/s... Eye Of The Tiger, Takashi! poma

Tested with 12 consecutive reboots and several non consecutive(multiboot), 3.15.0-0.rc4.git1.1.fc21.i686 PASSED Probably some of these net patches did the job, $ xzgrep diff\ --git kernel-3.15.0-0.rc4.git1.1.fc21.src/patch-3.15-rc4-git1.xz diff --git a/Documentation/devicetree/bindings/net/arc_emac.txt b/Documentation/devicetree/bindings/net/arc_emac.txt diff --git a/Documentation/networking/scaling.txt b/Documentation/networking/scaling.txt diff --git a/MAINTAINERS b/MAINTAINERS diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig diff --git a/arch/xtensa/boot/dts/kc705.dts b/arch/xtensa/boot/dts/kc705.dts diff --git a/arch/xtensa/boot/dts/xtfpga-flash-128m.dtsi b/arch/xtensa/boot/dts/xtfpga-flash-128m.dtsi diff --git a/arch/xtensa/boot/dts/xtfpga-flash-16m.dtsi b/arch/xtensa/boot/dts/xtfpga-flash-16m.dtsi diff --git a/arch/xtensa/boot/dts/xtfpga-flash-4m.dtsi b/arch/xtensa/boot/dts/xtfpga-flash-4m.dtsi diff --git a/arch/xtensa/boot/dts/xtfpga.dtsi b/arch/xtensa/boot/dts/xtfpga.dtsi diff --git a/arch/xtensa/include/asm/bootparam.h b/arch/xtensa/include/asm/bootparam.h diff --git a/arch/xtensa/include/asm/fixmap.h b/arch/xtensa/include/asm/fixmap.h diff --git a/arch/xtensa/include/asm/highmem.h b/arch/xtensa/include/asm/highmem.h diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h diff --git a/arch/xtensa/include/asm/sysmem.h b/arch/xtensa/include/asm/sysmem.h diff --git a/arch/xtensa/include/asm/tlbflush.h b/arch/xtensa/include/asm/tlbflush.h diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c diff --git a/arch/xtensa/kernel/smp.c b/arch/xtensa/kernel/smp.c diff --git a/arch/xtensa/kernel/xtensa_ksyms.c b/arch/xtensa/kernel/xtensa_ksyms.c diff --git a/arch/xtensa/mm/Makefile b/arch/xtensa/mm/Makefile diff --git a/arch/xtensa/mm/cache.c b/arch/xtensa/mm/cache.c diff --git a/arch/xtensa/mm/highmem.c b/arch/xtensa/mm/highmem.c diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c diff --git a/arch/xtensa/mm/mmu.c b/arch/xtensa/mm/mmu.c diff --git a/arch/xtensa/mm/tlb.c b/arch/xtensa/mm/tlb.c diff --git a/arch/xtensa/platforms/iss/Makefile b/arch/xtensa/platforms/iss/Makefile diff --git a/arch/xtensa/platforms/xt2000/setup.c b/arch/xtensa/platforms/xt2000/setup.c diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c diff --git a/drivers/bluetooth/ath3k.c b/drivers/bluetooth/ath3k.c diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c diff --git a/drivers/isdn/hisax/icc.c b/drivers/isdn/hisax/icc.c diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c diff --git a/drivers/net/can/c_can/Kconfig b/drivers/net/can/c_can/Kconfig diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c diff --git a/drivers/net/can/sja1000/sja1000_isa.c b/drivers/net/can/sja1000/sja1000_isa.c diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c diff --git a/drivers/net/ethernet/altera/Kconfig b/drivers/net/ethernet/altera/Kconfig diff --git a/drivers/net/ethernet/altera/altera_msgdma.c b/drivers/net/ethernet/altera/altera_msgdma.c diff --git a/drivers/net/ethernet/altera/altera_msgdma.h b/drivers/net/ethernet/altera/altera_msgdma.h diff --git a/drivers/net/ethernet/altera/altera_sgdma.c b/drivers/net/ethernet/altera/altera_sgdma.c diff --git a/drivers/net/ethernet/altera/altera_sgdma.h b/drivers/net/ethernet/altera/altera_sgdma.h diff --git a/drivers/net/ethernet/altera/altera_tse.h b/drivers/net/ethernet/altera/altera_tse.h diff --git a/drivers/net/ethernet/altera/altera_tse_ethtool.c b/drivers/net/ethernet/altera/altera_tse_ethtool.c diff --git a/drivers/net/ethernet/altera/altera_tse_main.c b/drivers/net/ethernet/altera/altera_tse_main.c diff --git a/drivers/net/ethernet/arc/emac.h b/drivers/net/ethernet/arc/emac.h diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.h diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c diff --git a/drivers/net/ethernet/cadence/Kconfig b/drivers/net/ethernet/cadence/Kconfig diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c diff --git a/drivers/net/ethernet/chelsio/Kconfig b/drivers/net/ethernet/chelsio/Kconfig diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c diff --git a/drivers/net/ethernet/freescale/gianfar_ethtool.c b/drivers/net/ethernet/freescale/gianfar_ethtool.c diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.h b/drivers/net/ethernet/intel/e1000e/ich8lan.h diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c diff --git a/drivers/net/ethernet/intel/e1000e/phy.h b/drivers/net/ethernet/intel/e1000e/phy.h diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c diff --git a/drivers/net/ethernet/intel/i40e/i40e_nvm.c b/drivers/net/ethernet/intel/i40e/i40e_nvm.c diff --git a/drivers/net/ethernet/intel/i40e/i40e_ptp.c b/drivers/net/ethernet/intel/i40e/i40e_ptp.c diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c diff --git a/drivers/net/ethernet/intel/igb/e1000_i210.c b/drivers/net/ethernet/intel/igb/e1000_i210.c diff --git a/drivers/net/ethernet/intel/igb/e1000_mac.c b/drivers/net/ethernet/intel/igb/e1000_mac.c diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c diff --git a/drivers/net/ethernet/mellanox/mlx4/port.c b/drivers/net/ethernet/mellanox/mlx4/port.c diff --git a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_common.h b/drivers/net/ethernet/samsung/sxgbe/sxgbe_common.h diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_core.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_core.c diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_desc.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_desc.c diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_desc.h b/drivers/net/ethernet/samsung/sxgbe/sxgbe_desc.h diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_dma.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_dma.c diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_mdio.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_mdio.c diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_reg.h b/drivers/net/ethernet/samsung/sxgbe/sxgbe_reg.h diff --git a/drivers/net/ethernet/smsc/smc91x.c b/drivers/net/ethernet/smsc/smc91x.c diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c diff --git a/drivers/net/slip/slip.c b/drivers/net/slip/slip.c diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c diff --git a/drivers/net/wireless/ath/ath9k/ahb.c b/drivers/net/wireless/ath/ath9k/ahb.c diff --git a/drivers/net/wireless/ath/ath9k/ani.c b/drivers/net/wireless/ath/ath9k/ani.c diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h diff --git a/drivers/net/wireless/ath/ath9k/debug_sta.c b/drivers/net/wireless/ath/ath9k/debug_sta.c diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c diff --git a/drivers/net/wireless/ath/ath9k/pci.c b/drivers/net/wireless/ath/ath9k/pci.c diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c diff --git a/drivers/net/wireless/brcm80211/brcmfmac/chip.c b/drivers/net/wireless/brcm80211/brcmfmac/chip.c diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c diff --git a/drivers/net/wireless/rtlwifi/rtl8188ee/trx.c b/drivers/net/wireless/rtlwifi/rtl8188ee/trx.c diff --git a/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c b/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c diff --git a/drivers/net/wireless/rtlwifi/rtl8192se/trx.c b/drivers/net/wireless/rtlwifi/rtl8192se/trx.c diff --git a/drivers/scsi/scsi_netlink.c b/drivers/scsi/scsi_netlink.c diff --git a/drivers/staging/iio/resolver/ad2s1200.c b/drivers/staging/iio/resolver/ad2s1200.c diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h diff --git a/drivers/usb/phy/phy-fsm-usb.c b/drivers/usb/phy/phy-fsm-usb.c diff --git a/drivers/usb/serial/qcserial.c b/drivers/usb/serial/qcserial.c diff --git a/drivers/usb/storage/shuttle_usbat.c b/drivers/usb/storage/shuttle_usbat.c diff --git a/drivers/usb/storage/unusual_devs.h b/drivers/usb/storage/unusual_devs.h diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c diff --git a/fs/ceph/locks.c b/fs/ceph/locks.c diff --git a/fs/ceph/super.h b/fs/ceph/super.h diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c diff --git a/include/linux/netlink.h b/include/linux/netlink.h diff --git a/include/linux/sock_diag.h b/include/linux/sock_diag.h diff --git a/include/linux/tty.h b/include/linux/tty.h diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h diff --git a/include/net/sock.h b/include/net/sock.h diff --git a/kernel/audit.c b/kernel/audit.c diff --git a/mm/slab.c b/mm/slab.c diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c diff --git a/net/can/gw.c b/net/can/gw.c diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c diff --git a/net/core/filter.c b/net/core/filter.c diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c diff --git a/net/core/sock.c b/net/core/sock.c diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c diff --git a/net/decnet/netfilter/dn_rtmsg.c b/net/decnet/netfilter/dn_rtmsg.c diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c diff --git a/net/ipv6/netfilter/ip6t_rpfilter.c b/net/ipv6/netfilter/ip6t_rpfilter.c diff --git a/net/ipv6/route.c b/net/ipv6/route.c diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c diff --git a/net/packet/diag.c b/net/packet/diag.c diff --git a/net/phonet/pn_netlink.c b/net/phonet/pn_netlink.c diff --git a/net/sched/act_api.c b/net/sched/act_api.c diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c diff --git a/net/sched/sch_hhf.c b/net/sched/sch_hhf.c diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c diff --git a/scripts/sortextable.c b/scripts/sortextable.c diff --git a/tools/net/bpf_dbg.c b/tools/net/bpf_dbg.c http://pkgs.fedoraproject.org/repo/pkgs/kernel/patch-3.15-rc4-git1.xz/4b0... poma

On 11.05.2014 12:02, poma wrote: ------------[ 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

On Thu, Apr 17, 2014 at 12:40 AM, Clemens Ladisch <clemens(a)ladisch.de&gt; wrote: Right, but coherency does not follow copy-on-write. The check is there to catch cases where a page is COW'd while an active dma mapping on the source page is present. Sure, the write is coherent, but due to the COW it's going to the wrong page, so you are potentially missing data in the new mapping. See how NET_DMA inspired this check: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/dr...