Hello Colin, I can see this issue with 5.0 kernel (5.0.0-47.51~18.04.1) as well, with the same node hotdog-kernel.

Do you think if we should fix this in 5.0 as well?
Thanks

 sysfs FAILED (kernel oopsed)
 [ 1108.615397] Unable to handle kernel paging request at virtual address ffff000046afa6a6
 [ 1108.617127] Unable to handle kernel paging request at virtual address ffff000046afd2d7
 [ 1108.623317] Mem abort info:
 [ 1108.627466] Unable to handle kernel paging request at virtual address ffff000046affffd
 [ 1108.627469] Mem abort info:
 [ 1108.627470]   ESR = 0x96000021
 [ 1108.627473]   Exception class = DABT (current EL), IL = 32 bits
 [ 1108.627477]   SET = 0, FnV = 0
 [ 1108.627480]   EA = 0, S1PTW = 0
 [ 1108.627482] Data abort info:
 [ 1108.627485]   ISV = 0, ISS = 0x00000021
 [ 1108.627487]   CM = 0, WnR = 0
 [ 1108.627490] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000815ac000
 [ 1108.627495] [ffff000046affffd] pgd=000000bffcfff003, pud=0000009f28e05003, pmd=0000009de53f9003, pte=006800008028f703
 [ 1108.627507] Internal error: Oops: 96000021 [#1] SMP
 [ 1108.627515] Modules linked in: unix_diag binfmt_misc snd_seq snd_seq_device snd_timer snd soundcore userio cuse hci_vhci bluetooth ecdh_generic vfio_iommu_type1 vfio uhid vhost_vsock vmw_vsock_virtio_transport_common vsock vhost_net vhost tap dccp_ipv4 dccp atm algif_rng aegis128 aegis128l aegis256 morus1280 morus640 algif_aead anubis fcrypt khazad seed sm4_generic tea crc32_generic md4 michael_mic nhpoly1305_neon nhpoly1305 poly1305_generic rmd128 rmd160 rmd256 rmd320 sha3_generic sm3_generic streebog_generic tgr192 wp512 algif_hash blowfish_generic blowfish_common cast5_generic des_generic salsa20_generic chacha_neon chacha_generic camellia_generic cast6_generic cast_common serpent_generic twofish_generic twofish_common algif_skcipher af_alg nls_iso8859_1 ipmi_ssif joydev input_leds ipmi_devintf ipmi_msghandler thunderx2_pmu 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
 [ 1108.627576]  async_raid6_recov async_memcpy async_pq async_xor async_tx xor xor_neon raid6_pq libcrc32c raid1 raid0 multipath linear i2c_smbus aes_ce_blk aes_ce_cipher uas ast i2c_algo_bit ttm drm_kms_helper syscopyarea crct10dif_ce usb_storage ghash_ce sysfillrect qede sha2_ce sysimgblt mpt3sas fb_sys_fops qed sha256_arm64 sha1_ce raid_class drm scsi_transport_sas ahci crc8 gpio_xlp i2c_xlp9xx hid_generic usbhid hid aes_neon_bs aes_neon_blk crypto_simd cryptd aes_arm64
 [ 1108.627607] Process stress-ng-sysfs (pid: 203940, stack limit = 0x0000000047d7ff87)
 [ 1108.627612] CPU: 93 PID: 203940 Comm: stress-ng-sysfs Not tainted 5.0.0-47-generic #51~18.04.1-Ubuntu
 [ 1108.627614] Hardware name: To be filled by O.E.M. Saber/Saber, BIOS 0ACKL027 07/01/2019
 [ 1108.627616] pstate: 80400009 (Nzcv daif +PAN -UAO)
 [ 1108.627623] pc : __memcpy+0x9c/0x180
 [ 1108.627629] lr : memory_read_from_buffer+0x64/0x88
 [ 1108.627630] sp : ffff000059933c90
 [ 1108.627631] x29: ffff000059933c90 x28: ffff809e4d35ac40 
 [ 1108.627634] x27: 0000000000000000 x26: 0000000000000000 
 [ 1108.627636] x25: 0000000056000000 x24: ffff000046af0000 
 [ 1108.627637] x23: ffff809ee6fad000 x22: 0000000000000003 
 [ 1108.627639] x21: ffff000059933d08 x20: 0000000000000003 
 [ 1108.627640] x19: 0000000000010000 x18: 0000000000000000 
 [ 1108.627641] x17: 0000000000000000 x16: 0000000000000000 
 [ 1108.627643] x15: 0000000000000000 x14: 0000000000000000 
 [ 1108.627644] x13: 0000000000000000 x12: 0000000000000000 
 [ 1108.627645] x11: 0000000000000000 x10: 0000000000000000 
 [ 1108.627647] x9 : 0000000000000000 x8 : 0000000000000000 
 [ 1108.627648] x7 : ffff0000106cd1d8 x6 : ffff809ee6fad000 
 [ 1108.627650] x5 : 0000000000000003 x4 : 0000000000010000 
 [ 1108.627651] x3 : ffff000046af0000 x2 : 0000000000000003 
 [ 1108.627653] x1 : ffff000046affffd x0 : ffff809ee6fad000 
 [ 1108.627655] Call trace:
 [ 1108.627657]  __memcpy+0x9c/0x180
 [ 1108.627661]  acpi_data_show+0x54/0x80
 [ 1108.627664]  sysfs_kf_bin_read+0x6c/0xa8
 [ 1108.627669]  kernfs_fop_read+0xa8/0x228
 [ 1108.627674]  __vfs_read+0x48/0x80
 [ 1108.627676]  vfs_read+0x94/0x150
 [ 1108.627678]  ksys_read+0x74/0xf0
 [ 1108.627680]  __arm64_sys_read+0x24/0x30
 [ 1108.627686]  el0_svc_common+0x88/0x180
 [ 1108.627688]  el0_svc_handler+0x38/0x78
 [ 1108.627692]  el0_svc+0x8/0xc
 [ 1108.627695] Code: 36100062 b8404423 b80044c3 36080062 (78402423) 
 [ 1108.627698] ---[ end trace 3ac0a382f7e22655 ]---
 [ 1108.631236] Mem abort info:
 [ 1108.634018]   ESR = 0x96000021
 [ 1108.634020]   Exception class = DABT (current EL), IL = 32 bits
 [ 1108.634021]   SET = 0, FnV = 0
 [ 1108.634025]   EA = 0, S1PTW = 0
 [ 1108.641929]   ESR = 0x96000021
 [ 1108.641930]   Exception class = DABT (current EL), IL = 32 bits
 [ 1108.641931]   SET = 0, FnV = 0
 [ 1108.641934]   EA = 0, S1PTW = 0
 [ 1108.644717] Data abort info:
 [ 1108.644718]   ISV = 0, ISS = 0x00000021
 [ 1108.644719]   CM = 0, WnR = 0
 [ 1108.644720] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000815ac000
 [ 1108.644724] [ffff000046afa6a6] pgd=000000bffcfff003, pud=0000009f28e05003, pmd=0000009de53f9003, pte=006800008028a703
 [ 1108.647767] Data abort info:
 [ 1108.647768]   ISV = 0, ISS = 0x00000021
 [ 1108.647769]   CM = 0, WnR = 0
 [ 1108.647773] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000815ac000
 [ 1108.653681] Internal error: Oops: 96000021 [#2] SMP
 [ 1108.653684] Modules linked in: unix_diag binfmt_misc snd_seq snd_seq_device snd_timer snd soundcore userio cuse hci_vhci bluetooth ecdh_generic vfio_iommu_type1 vfio uhid vhost_vsock vmw_vsock_virtio_transport_common vsock vhost_net vhost tap dccp_ipv4 dccp atm algif_rng aegis128 aegis128l aegis256 morus1280 morus640 algif_aead anubis fcrypt khazad seed sm4_generic tea crc32_generic md4 michael_mic nhpoly1305_neon nhpoly1305 poly1305_generic rmd128 rmd160 rmd256 rmd320 sha3_generic sm3_generic streebog_generic tgr192 wp512 algif_hash blowfish_generic blowfish_common cast5_generic des_generic salsa20_generic chacha_neon chacha_generic camellia_generic cast6_generic cast_common serpent_generic twofish_generic twofish_common algif_skcipher af_alg nls_iso8859_1 ipmi_ssif joydev input_leds ipmi_devintf ipmi_msghandler thunderx2_pmu 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
 [ 1108.653717]  async_raid6_recov
 [ 1108.656728] [ffff000046afd2d7] pgd=000000bffcfff003
 [ 1108.659851]  async_memcpy async_pq async_xor async_tx xor xor_neon raid6_pq libcrc32c raid1 raid0 multipath linear i2c_smbus aes_ce_blk aes_ce_cipher uas ast i2c_algo_bit ttm drm_kms_helper syscopyarea crct10dif_ce usb_storage ghash_ce sysfillrect qede sha2_ce sysimgblt mpt3sas fb_sys_fops qed sha256_arm64 sha1_ce raid_class drm scsi_transport_sas ahci crc8 gpio_xlp i2c_xlp9xx hid_generic usbhid hid aes_neon_bs aes_neon_blk crypto_simd cryptd aes_arm64
 [ 1108.662734] , pud=0000009f28e05003, pmd=0000009de53f9003, pte=006800008028d703
 [ 1108.666553] Process stress-ng-sysfs (pid: 203926, stack limit = 0x00000000279f28a6)
 [ 1108.666556] CPU: 91 PID: 203926 Comm: stress-ng-sysfs Tainted: G      D           5.0.0-47-generic #51~18.04.1-Ubuntu
 [ 1108.666557] Hardware name: To be filled by O.E.M. Saber/Saber, BIOS 0ACKL027 07/01/2019
 [ 1108.666558] pstate: 80400009 (Nzcv daif +PAN -UAO)
 [ 1108.666562] pc : __memcpy+0x90/0x180
 [ 1108.666567] lr : memory_read_from_buffer+0x64/0x88
 [ 1108.840632] Unable to handle kernel paging request at virtual address ffff000046af8aed
 [ 1108.842368] Unable to handle kernel paging request at virtual address ffff000046af171f
 [ 1108.842372] Mem abort info:
 [ 1108.842373]   ESR = 0x96000021
 [ 1108.842376]   Exception class = DABT (current EL), IL = 32 bits
 [ 1108.842378]   SET = 0, FnV = 0
 [ 1108.842380]   EA = 0, S1PTW = 0
 [ 1108.842384] Data abort info:
 [ 1108.842386]   ISV = 0, ISS = 0x00000021
 [ 1108.842390]   CM = 0, WnR = 0
 [ 1108.842395] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000815ac000
 [ 1108.842398] [ffff000046af171f] pgd=000000bffcfff003, pud=0000009f28e05003, pmd=0000009de53f9003, pte=0068000080281703
 [ 1108.845483] sp : ffff00004a093c90
 [ 1108.845484] x29: ffff00004a093c90 x28: ffff809e4d358ec0 
 [ 1108.845486] x27: 0000000000000000 x26: 0000000000000000 
 [ 1108.845487] x25: 0000000056000000 x24: ffff000046af0000 
 [ 1108.845489] x23: ffff809d53f70600 x22: 0000000000000007 
 [ 1108.845490] x21: ffff00004a093d08 x20: 0000000000000007 
 [ 1108.845492] x19: 000000000000a6ad x18: 0000000000000000 
 [ 1108.850277] Mem abort info:
 [ 1108.853833] x17: 0000000000000000 x16: 0000000000000000 
 [ 1108.858628]   ESR = 0x96000021
 [ 1108.861909] x15: 0000000000000000 x14: 0000000000000000 
 [ 1108.867216]   Exception class = DABT (current EL), IL = 32 bits
 [ 1108.872503] x13: 0000000000000000 x12: 0000000000000000 
 [ 1108.872504] x11: 0000000000000000 x10: 0000000000000000 
 [ 1108.872506] x9 : 0000000000000000 x8 : 0000000000000000 
 [ 1108.872507] x7 : ffff0000106cd1d8 x6 : ffff809d53f70600 
 [ 1108.872508] x5 : 0000000000000007 x4 : 0000000000010000 
 [ 1108.872510] x3 : ffff000046af0000 x2 : 0000000000000007 
 [ 1108.872514] x1 : ffff000046afa6a6 x0 : ffff809d53f70600 
 [ 1108.877816]   SET = 0, FnV = 0
 [ 1108.883108] Call trace:
 [ 1108.883113]  __memcpy+0x90/0x180
 [ 1108.883116]  acpi_data_show+0x54/0x80
 [ 1108.883119]  sysfs_kf_bin_read+0x6c/0xa8
 [ 1108.883124]  kernfs_fop_read+0xa8/0x228
 [ 1108.888421]   EA = 0, S1PTW = 0
 [ 1108.893718]  __vfs_read+0x48/0x80
 [ 1108.893719]  vfs_read+0x94/0x150
 [ 1108.893721]  ksys_read+0x74/0xf0
 [ 1108.893722]  __arm64_sys_read+0x24/0x30
 [ 1108.893727]  el0_svc_common+0x88/0x180
 [ 1108.893728]  el0_svc_handler+0x38/0x78
 [ 1108.893731]  el0_svc+0x8/0xc
 [ 1108.893736] Code: 36180062 f8408423 f80084c3 36100062 (b8404423) 
 [ 1108.899039] Data abort info:
 [ 1108.904332] ---[ end trace 3ac0a382f7e22656 ]---