[   52.448904] ------------[ cut here ]------------

[   52.453927] WARNING: CPU: 3 PID: 748 at lib/dma-debug.c:614 debug_dma_assert_idle+0x148/0x1e0

[   52.463044] bcm2835-dma 3f007000.dma: DMA-API: cpu touching an active dma mapped cacheline [cln=0x00c479c0]

[   52.473433] Modules linked in: rc_cec vc4 snd_soc_core ac97_bus snd_pcm_dmaengine cec rc_core snd_pcm snd_timer snd soundcore hci_uart drm_kms_helper brcmfmac btbcm btqca drm btintel brcmutil bluetooth fb_sys_fops cfg80211 syscopyarea sysfillrect sysimgblt ecdh_generic rfkill bcm2835_wdt bcm2835_thermal bcm2835_rng leds_gpio xfs libcrc32c smsc95xx usbnet mii mmc_block sdhci_iproc crc32_arm_ce sdhci_pltfm dwc2 udc_core sdhci pwm_bcm2835 i2c_bcm2835 bcm2835 bcm2835_dma phy_generic

[   52.518818] CPU: 3 PID: 748 Comm: bash Not tainted 4.14.0-0.rc7.git2.1.fc28.armv7hl #1

[   52.527208] Hardware name: Generic DT based system

[   52.532314] [<c0313154>] (unwind_backtrace) from [<c030d92c>] (show_stack+0x18/0x1c)

[   52.540530] [<c030d92c>] (show_stack) from [<c0b7d210>] (dump_stack+0xa0/0xd8)

[   52.548197] [<c0b7d210>] (dump_stack) from [<c0353ee8>] (__warn+0xe4/0x104)

[   52.555586] [<c0353ee8>] (__warn) from [<c0353f44>] (warn_slowpath_fmt+0x3c/0x4c)

[   52.563526] [<c0353f44>] (warn_slowpath_fmt) from [<c07101d4>] (debug_dma_assert_idle+0x148/0x1e0)

[   52.573030] [<c07101d4>] (debug_dma_assert_idle) from [<c04e4b98>] (wp_page_copy+0xfc/0x640)

[   52.581982] [<c04e4b98>] (wp_page_copy) from [<c04e6668>] (do_wp_page+0x3a4/0x5ac)

[   52.590009] [<c04e6668>] (do_wp_page) from [<c04e99c0>] (handle_mm_fault+0xd28/0xde0)

[   52.598319] [<c04e99c0>] (handle_mm_fault) from [<c0b99800>] (do_page_fault+0x244/0x3b8)

[   52.606901] [<c0b99800>] (do_page_fault) from [<c0301348>] (do_DataAbort+0x40/0xc0)

[   52.615025] [<c0301348>] (do_DataAbort) from [<c0b990e0>] (__dabt_usr+0x40/0x60)

[   52.622865] Exception stack(0xedee7fb0 to 0xedee7ff8)

[   52.628227] 7fa0:                                     00fb1f88 00000000 00588464 01041420

[   52.636899] 7fc0: 00000000 00fae738 00000000 ffffffff 005833e8 00000001 00000000 01024238

[   52.645570] 7fe0: 00fb1f88 bebaf9c8 0050e1ec 004ac3c4 20030010 ffffffff

[   52.652646] ---[ end trace 9babae82f6635701 ]---

[   52.657596] Mapped at:

[   52.660173]  bcm2835_dma_create_cb_chain+0xb0/0x1f0 [bcm2835_dma]

[   52.666761]  bcm2835_dma_prep_slave_sg+0xf0/0x25c [bcm2835_dma]

[   52.673103]  bcm2835_request+0x324/0x490 [bcm2835]

[   52.678258]  mmc_start_request+0x278/0x2bc

[   52.682677]  mmc_start_areq+0x248/0x34c