Description of problem: Unable to handle kernel paging request happens after running OrangePi Prime for about 10 hours. It seems disable the dnf makecache timer is the root reproducer. Version-Release number of selected component (if applicable): kernel-4.18.5-200.fc28.aarch64 Fedoa 28 aarch64 How reproducible: Frequently Steps to Reproduce: 1. Power on OrangePi Prime with the given kernel, then just let it there to wait for dnf makecache automatically run for several times 2. 3. Actual results: System will hang with unable to handle kernel paging request on console (There are a lot of "wlan0: link is not ready" before and after the oops which I did not paste here) [36630.569110] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready [36945.596633] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready [37124.218855] Unable to handle kernel paging request at virtual address ffff000009687dd8 [37124.226850] Mem abort info: [37124.229645] ESR = 0x96000007 [37124.232700] Exception class = DABT (current EL), IL = 32 bits [37124.238655] SET = 0, FnV = 0 [37124.241715] EA = 0, S1PTW = 0 [37124.244855] Data abort info: [37124.247753] ISV = 0, ISS = 0x00000007 [37124.251589] CM = 0, WnR = 0 [37124.254562] swapper pgtable: 4k pages, 48-bit VAs, pgdp = 0000000014395a12 [37124.261447] [ffff000009687dd8] pgd=00000000bfffe803, pud=00000000bfffd803, pmd=00000000bfff9803, pte=00f8000041687f13 [37124.272077] Internal error: Oops: 96000007 [#1] SMP [37124.276955] Modules linked in: ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack libcrc32c iptable_mangle iptable_raw iptable_security ebtable_filter ebtables ip6table_filter ip6_tables vfat fat realtek snd_soc_hdmi_codec rc_cec dw_hdmi_cec dw_hdmi_i2s_audio sun8i_codec_analog sun4i_codec dwmac_sun8i r8723bs(C) stmmac_platform snd_soc_core stmmac mdio_mux ac97_bus of_mdio snd_pcm_dmaengine sun8i_drm_hdmi fixed_phy snd_pcm libphy dw_hdmi snd_timer crc32_ce cec crct10dif_ce snd sunxi_cir sun4i_drm ghash_ce rc_core sun4i_frontend sun8i_mixer sun4i_tcon soundcore [37124.347855] cfg80211 drm_kms_helper sunxi_wdt drm rfkill fb_sys_fops syscopyarea sysfillrect leds_gpio sysimgblt mmc_block sunxi phy_generic musb_hdrc udc_core ohci_platform ehci_platform sunxi_mmc phy_sun4i_usb gpio_keys [37124.367625] CPU: 3 PID: 2538 Comm: dnf Tainted: G C 4.18.5-200.fc28.aarch64 #1 [37124.376148] Hardware name: sunxi sunxi/sunxi, BIOS 2018.03 04/15/2018 [37124.382589] pstate: 20400005 (nzCv daif +PAN -UAO) [37124.387395] pc : memblock_is_map_memory+0x24/0xa0 [37124.392105] lr : pfn_valid+0x20/0x30 [37124.395679] sp : ffff00000e033c60 [37124.398993] x29: ffff00000e033c60 x28: ffff8000763a8000 [37124.404308] x27: ffff000008a42000 x26: 000000000000004f [37124.409620] x25: 00000000000007ff x24: ffff00000e033e38 [37124.414924] x23: 0000000000000000 x22: ffff800074cbb000 [37124.420236] x21: 0000000074cba020 x20: 0000000000000fe0 [37124.425550] x19: 00000000b4cba000 x18: 000000000000023f [37124.430863] x17: 0000000000000000 x16: 0000000000000000 [37124.436176] x15: 0000000000000000 x14: 000000000000002b [37124.441490] x13: 736e6967756c702d x12: 666e642f73656761 [37124.446803] x11: 6b6361702d657469 x10: 732f362e336e6f68 [37124.452117] x9 : 736567616b636170 x8 : ffff800074cbe000 [37124.457430] x7 : ffff800074cba000 x6 : 0000000000004000 [37124.462743] x5 : 0000000000015831 x4 : 0000ffffffffffff [37124.468055] x3 : 0000000000000000 x2 : 0000000000000000 [37124.473368] x1 : 0000000000000fe0 x0 : ffff000009687dc8 [37124.478684] Process dnf (pid: 2538, stack limit = 0x00000000956e6cc5) [37124.485120] Call trace: [37124.487571] memblock_is_map_memory+0x24/0xa0 [37124.491928] pfn_valid+0x20/0x30 [37124.495162] __check_object_size+0x68/0x1e0 [37124.499351] strncpy_from_user+0x48/0x368 [37124.503362] getname_flags+0x6c/0x1b0 [37124.507026] user_path_at_empty+0x40/0x78 [37124.511039] vfs_statx+0x80/0xe0 [37124.514269] sys_newfstatat+0x40/0x68 [37124.517934] el0_svc_naked+0x30/0x34 [37124.521515] Code: d503201f 90009fa0 91372000 52800003 (b9401002) [37124.527610] ---[ end trace 68c59fb7d3d25bfc ]--- [37260.624594] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready Expected results: System should work fine Additional info: With dnf makecache service disabled, this will not happen again. I also talked to one of the linux-sunxi kernel developer, she said kernel should not oops no matter how bad the userspace is coded. So I report it here.