[44840.861379] Unable to handle kernel NULL pointer dereference at virtual address 00000007
[44840.869468] Mem abort info:
[44840.872273] ESR = 0x96000046
[44840.875331] Exception class = DABT (current EL), IL = 32 bits
[44840.881241] SET = 0, FnV = 0
[44840.884308] EA = 0, S1PTW = 0
[44840.887475] Data abort info:
[44840.890349] ISV = 0, ISS = 0x00000046
[44840.894200] CM = 0, WnR = 1
[44840.897190] user pgtable: 4k pages, 48-bit VAs, pgd = 000000001f558dda
[44840.903712] [0000000000000007] *pgd=00002027c3af7003, *pud=0000202706580003, *pmd=0000000000000000
[44840.912665] Internal error: Oops: 96000046 [#1] SMP
[44840.917532] Modules linked in: nls_iso8859_1 ipmi_ssif joydev input_leds snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_timer hns_roce_hw_v2 snd soundcore ipmi_si hns_roce ipmi_devintf ipmi_msghandler shpchp cppc_cpufreq sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear amdgpu ses enclosure hibmc_drm chash i2c_algo_bit hid_generic realtek ttm aes_ce_blk aes_ce_cipher drm_kms_helper crc32_ce crct10dif_ce ghash_ce sha2_ce syscopyarea hns3 hisi_sas_v3_hw sysfillrect usbhid sysimgblt hisi_sas_main fb_sys_fops sha256_arm64 drm libsas hclge sha1_ce
[44840.987889] megaraid_sas hid ahci hnae3 libahci scsi_transport_sas gpio_dwapb aes_neon_bs aes_neon_blk crypto_simd cryptd aes_arm64
[44840.999774] Process QThread (pid: 25670, stack limit = 0x00000000a6c374ea)
[44841.006630] CPU: 79 PID: 25670 Comm: QThread Not tainted 4.15.18 #1
[44841.012877] Hardware name: ************************** 12/14/2019
[44841.021038] pstate: 60400009 (nZCv daif +PAN -UAO)
[44841.025840] pc : ttm_dma_unpopulate+0xd4/0x4b0 [ttm]
[44841.030816] lr : ttm_dma_unpopulate+0xd0/0x4b0 [ttm]
[44841.035770] sp : ffff00005d68b9b0
[44841.039075] x29: ffff00005d68b9b0 x28: ffffa02f9f831330
[44841.044375] x27: ffffa02e9c638358 x26: 0000000000000001
[44841.049671] x25: ffffa02f9f831300 x24: ffff802fb98890a0
[44841.054970] x23: ffff802fb98892d8 x22: 0000000000000008
[44841.060277] x21: ffffffffffffffff x20: ffffa021c1626a00
[44841.065582] x19: ffffa02e9c638300 x18: 0000000000006b90
[44841.070883] x17: 0000ffff93e91b10 x16: ffff000008304950
[44841.076181] x15: 00004b280a000000 x14: 001a76e700000000
[44841.081477] x13: 000000005e4a9d86 x12: 0000000000000018
[44841.086770] x11: 0000000037f1d9de x10: 0000000000000040
[44841.092069] x9 : ffffa05782f91838 x8 : ffffa0408b8591c8
[44841.097367] x7 : ffffffffffffffff x6 : ffffffffffffffff
[44841.102657] x5 : 0000000000000002 x4 : ffff802f9b989e88
[44841.107949] x3 : 0000000000000002 x2 : 0000000000010000
[44841.113239] x1 : ffff802f9b989e70 x0 : 0000000000000001
[44841.118540] Call trace:
[44841.121017] ttm_dma_unpopulate+0xd4/0x4b0 [ttm]
[44841.125768] amdgpu_ttm_tt_unpopulate+0xa8/0xb8 [amdgpu]
[44841.131086] ttm_tt_unpopulate.part.2+0x64/0x70 [ttm]
[44841.136129] ttm_tt_destroy.part.3+0x68/0x70 [ttm]
[44841.140916] ttm_tt_destroy+0x24/0x30 [ttm]
[44841.145102] ttm_bo_cleanup_memtype_use+0x40/0x98 [ttm]
[44841.150320] ttm_bo_unref+0x1d0/0x270 [ttm]
[44841.154622] amdgpu_bo_unref+0x44/0x78 [amdgpu]
[44841.159317] amdgpu_gem_object_free+0x44/0x68 [amdgpu]
[44841.164495] drm_gem_object_free+0x30/0x70 [drm]
[44841.169141] drm_gem_object_put_unlocked+0x7c/0xa0 [drm]
[44841.174482] drm_gem_object_handle_put_unlocked+0x68/0xd0 [drm]
[44841.180432] drm_gem_object_release_handle+0x5c/0x98 [drm]
[44841.185940] drm_gem_handle_delete+0x68/0xb8 [drm]
[44841.190768] drm_gem_close_ioctl+0x3c/0x58 [drm]
[44841.195410] drm_ioctl_kernel+0x70/0xd0 [drm]
[44841.199787] drm_ioctl+0x1fc/0x458 [drm]
[44841.203827] amdgpu_drm_ioctl+0x58/0x90 [amdgpu]
[44841.208430] do_vfs_ioctl+0xc4/0xb50
[44841.211995] SyS_ioctl+0x8c/0xa8
[44841.215216] el0_svc_naked+0x30/0x34
[44841.218807] Code: f9400e81 f9402000 97ffd3a5 a9401a87 (f90004e6)
[44841.224967] SMP: stopping secondary CPUs
