** Changed in: kunpeng920
       Status: In Progress => Incomplete

** Changed in: linux (Ubuntu)
       Status: In Progress => Incomplete

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https://bugs.launchpad.net/bugs/1935583

Title:
  Kernel panic on Bionic 5.4.0-47-generic

Status in kunpeng920:
  Incomplete
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Bug Description]
  Stack overflow in Kunpeng 920 32cores server, cause system reboot in 
production environment every month

  [Steps to Reproduce]
  1)I cannot reproduce coz its a low-probability event

  
  [Actual Results]
  [1474521.296779] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.323300] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.349890] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.376451] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.411383] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.438042] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.455965] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.481140] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.508051] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.534519] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.561541] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.565243] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.596849] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.623516] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.659077] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.677128] Kernel panic - not syncing: corrupted stack end detected 
inside scheduler
  [1474521.685108] CPU: 7 PID: 5387 Comm: query_event Kdump: loaded Tainted: G  
         OE     5.4.0-47-generic #51~18.04.1-Ubuntu
  [1474521.686201] ACPI CPPC: PCC check channel failed for ss: 0. ret=-110
  [1474521.689690] Unable to handle kernel paging request at virtual address 
ffff8027ce43b007
  [1474521.689693] Mem abort info:
  [1474521.689695]   ESR = 0x96000005
  [1474521.689698]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.689700]   SET = 0, FnV = 0
  [1474521.689702]   EA = 0, S1PTW = 0
  [1474521.689703] Data abort info:
  [1474521.689705]   ISV = 0, ISS = 0x00000005
  [1474521.689706]   CM = 0, WnR = 0
  [1474521.689710] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.689712] [ffff8027ce43b007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.689719] Internal error: Oops: 96000005 [#1] SMP
  [1474521.689722] Modules linked in: binfmt_misc xt_MASQUERADE iptable_nat 
nf_nat xt_tcpudp xt_multiport xt_conntrack nf_conntrack nf_defrag_ipv6 
nf_defrag_ipv4 iptable_filter bpfilter rpcsec_gss_krb5 nfsv4 nfs fscache 
bonding nls_iso8859_1 ipmi_ssif joydev input_leds hns_roce_hw_v2 ib_uverbs 
ipmi_si spi_dw_mmio ipmi_devintf ipmi_msghandler spi_dw hisi_dma cppc_cpufreq 
sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp 
libiscsi scsi_transport_iscsi nfsd auth_rpcgss nfs_acl lockd grace sunrpc 
ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov 
async_memcpy async_pq async_xor async_tx xor xor_neon raid6_pq libcrc32c raid1 
raid0 multipath linear ses enclosure mlx5_ib(OE) hibmc_drm realtek 
drm_vram_helper ttm drm_kms_helper hid_generic crct10dif_ce syscopyarea 
sysfillrect ghash_ce mlx5_core(OE) sysimgblt hisi_sas_v3_hw sha2_ce hns3 
hisi_sas_main sha256_arm64 fb_sys_fops mlx_compat(OE) sha1_ce hclge libsas 
usbhid tls drm hid hnae3 megaraid_sas ahci
  [1474521.689802]  scsi_transport_sas mlxfw(OE) gpio_dwapb aes_neon_bs 
aes_neon_blk aes_ce_blk crypto_simd cryptd aes_ce_cipher
  [1474521.689814] CPU: 14 PID: 5899 Comm: tcp_upload Kdump: loaded Tainted: G  
         OE     5.4.0-47-generic #51~18.04.1-Ubuntu
  [1474521.689816] Hardware name: [About Privacy Deleted], BIOS 1.39 06/11/2020
  [1474521.689819] pstate: 00400009 (nzcv daif +PAN -UAO)
  [1474521.689831] pc : kmem_cache_alloc+0x4c/0x220
  [1474521.689835] lr : kmem_cache_alloc+0x44/0x220
  [1474521.689836] sp : ffff800010073b90
  [1474521.689838] x29: ffff800010073b90 x28: 0000000000000001 
  [1474521.689841] x27: ffff0027b78270c0 x26: ffff2027cc2b0000 
  [1474521.689844] x25: 00000000000005ea x24: 0000000000000040 
  [1474521.689847] x23: ffff2027d3896000 x22: ffff800010c11a8c 
  [1474521.689850] x21: 0000000000000a20 x20: 0000000000000007 
  [1474521.689852] x19: ffff2027d3896000 x18: 0000000000000014 
  [1474521.689856] x17: 00000000ea74f425 x16: 000000005fe3fcbf 
  [1474521.689859] x15: 00000000f26bfafa x14: 683f9e854da8ab18 
  [1474521.689862] x13: e3274a9b1fac7e1b x12: 298175ef2f49b6e3 
  [1474521.689864] x11: 5ac56f1f37f55ef9 x10: 0000000000000040 
  [1474521.689867] x9 : 000000000000000a x8 : 0000000000000006 
  [1474521.689870] x7 : ffff800011b78908 x6 : ffff000000000000 
  [1474521.689873] x5 : 0000000000000000 x4 : ffff00279db94e2a 
  [1474521.689875] x3 : ffff800010073c88 x2 : ffff800011b7a000 
  [1474521.689877] x1 : 0000000000000100 x0 : ffff8027ce43b000 
  [1474521.689880] Call trace:
  [1474521.689885]  kmem_cache_alloc+0x4c/0x220
  [1474521.689892]  __build_skb+0x2c/0x88
  [1474521.689896]  build_skb+0x28/0x98
  [1474521.690020]  mlx5e_skb_from_cqe_linear+0x128/0x1c8 [mlx5_core]
  [1474521.690108]  mlx5e_handle_rx_cqe+0x84/0x1c8 [mlx5_core]
  [1474521.690194]  mlx5e_poll_rx_cq+0x174/0x9c8 [mlx5_core]
  [1474521.690282]  mlx5e_napi_poll+0xec/0x5c0 [mlx5_core]
  [1474521.690287]  net_rx_action+0x170/0x460
  [1474521.690291]  __do_softirq+0x11c/0x350
  [1474521.690295]  irq_exit+0xc0/0xc8
  [1474521.690300]  __handle_domain_irq+0x6c/0xc0
  [1474521.690302]  gic_handle_irq+0xec/0x2c4
  [1474521.690305]  el1_irq+0x104/0x1c0
  [1474521.690310]  __arch_copy_from_user+0x1b4/0x340
  [1474521.690314]  iov_iter_copy_from_user_atomic+0xe8/0x3a0
  [1474521.690319]  generic_perform_write+0xdc/0x1b0
  [1474521.690355]  nfs_file_write+0x110/0x238 [nfs]
  [1474521.690360]  new_sync_write+0x108/0x1b0
  [1474521.690363]  __vfs_write+0x74/0x80
  [1474521.690366]  vfs_write+0xb8/0x1d8
  [1474521.690369]  ksys_write+0x74/0xf8
  [1474521.690372]  __arm64_sys_write+0x24/0x30
  [1474521.690376]  el0_svc_common.constprop.2+0x80/0x1e8
  [1474521.690378]  el0_svc_handler+0x34/0xa0
  [1474521.690381]  el0_svc+0x10/0x2c8
  [1474521.690387] Code: f90023b9 97ffe654 f9400274 91002294 (f8606a99) 
  [1474521.690392] ---[ end trace 0242a0b3e3a7dec1 ]---
  [1474521.690728] Unable to handle kernel paging request at virtual address 
ffff8027ce2d0007
  [1474521.690731] Mem abort info:
  [1474521.690732]   ESR = 0x96000005
  [1474521.690735]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.690737]   SET = 0, FnV = 0
  [1474521.690738]   EA = 0, S1PTW = 0
  [1474521.690740] Data abort info:
  [1474521.690741]   ISV = 0, ISS = 0x00000005
  [1474521.690743]   CM = 0, WnR = 0
  [1474521.690746] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.690749] [ffff8027ce2d0007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.691158] Unable to handle kernel paging request at virtual address 
ffff8027ce4bf007
  [1474521.691161] Mem abort info:
  [1474521.691163]   ESR = 0x96000005
  [1474521.691165]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.691167]   SET = 0, FnV = 0
  [1474521.691169]   EA = 0, S1PTW = 0
  [1474521.691170] Data abort info:
  [1474521.691172]   ISV = 0, ISS = 0x00000005
  [1474521.691173]   CM = 0, WnR = 0
  [1474521.691177] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.691179] [ffff8027ce4bf007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.691217] Unable to handle kernel paging request at virtual address 
ffff8027ce396007
  [1474521.691244] Mem abort info:
  [1474521.691250]   ESR = 0x96000005
  [1474521.691255]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.691259]   SET = 0, FnV = 0
  [1474521.691263]   EA = 0, S1PTW = 0
  [1474521.691267] Data abort info:
  [1474521.691272]   ISV = 0, ISS = 0x00000005
  [1474521.691275]   CM = 0, WnR = 0
  [1474521.691281] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.691287] [ffff8027ce396007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.691458] Unable to handle kernel paging request at virtual address 
ffff8027ce49e007
  [1474521.691464] Mem abort info:
  [1474521.691467]   ESR = 0x96000005
  [1474521.691471]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.691474]   SET = 0, FnV = 0
  [1474521.691477]   EA = 0, S1PTW = 0
  [1474521.691479] Data abort info:
  [1474521.691482]   ISV = 0, ISS = 0x00000005
  [1474521.691484]   CM = 0, WnR = 0
  [1474521.691489] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.691492] [ffff8027ce49e007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.692576] Unable to handle kernel paging request at virtual address 
ffff8027ce375007
  [1474521.692596] Mem abort info:
  [1474521.692601]   ESR = 0x96000005
  [1474521.692605]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.692606]   SET = 0, FnV = 0
  [1474521.692610]   EA = 0, S1PTW = 0
  [1474521.692611] Data abort info:
  [1474521.692615]   ISV = 0, ISS = 0x00000005
  [1474521.692617]   CM = 0, WnR = 0
  [1474521.692621] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.692624] [ffff8027ce375007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.693226] Unable to handle kernel paging request at virtual address 
ffff8027ce2f1007
  [1474521.693229] Mem abort info:
  [1474521.693231]   ESR = 0x96000005
  [1474521.693233]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.693235]   SET = 0, FnV = 0
  [1474521.693236]   EA = 0, S1PTW = 0
  [1474521.693238] Data abort info:
  [1474521.693239]   ISV = 0, ISS = 0x00000005
  [1474521.693241]   CM = 0, WnR = 0
  [1474521.693244] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.693246] [ffff8027ce2f1007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.693912] Unable to handle kernel paging request at virtual address 
ffff8027ce312007
  [1474521.693925] Mem abort info:
  [1474521.693928]   ESR = 0x96000005
  [1474521.693935]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.693939]   SET = 0, FnV = 0
  [1474521.693944]   EA = 0, S1PTW = 0
  [1474521.693948] Data abort info:
  [1474521.693951]   ISV = 0, ISS = 0x00000005
  [1474521.693955]   CM = 0, WnR = 0
  [1474521.693961] Unable to handle kernel paging request at virtual address 
ffff8027ce28e007
  [1474521.693966] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.693969] Mem abort info:
  [1474521.693973] [ffff8027ce312007] pgd=00002027fffff003
  [1474521.693976]   ESR = 0x96000005
  [1474521.693978] , pud=0000000000000000
  [1474521.693984]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.693988]   SET = 0, FnV = 0
  [1474521.693992]   EA = 0, S1PTW = 0
  [1474521.693994] Data abort info:
  [1474521.693998]   ISV = 0, ISS = 0x00000005
  [1474521.694002]   CM = 0, WnR = 0
  [1474521.694007] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.694011] [ffff8027ce28e007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.694596] Unable to handle kernel paging request at virtual address 
ffff8027ce41a007
  [1474521.694611] Mem abort info:
  [1474521.694614]   ESR = 0x96000005
  [1474521.694621]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.694624]   SET = 0, FnV = 0
  [1474521.694627]   EA = 0, S1PTW = 0
  [1474521.694631] Data abort info:
  [1474521.694636]   ISV = 0, ISS = 0x00000005
  [1474521.694638]   CM = 0, WnR = 0
  [1474521.694643] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.694646] [ffff8027ce41a007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.694940] Unable to handle kernel paging request at virtual address 
ffff8027ce47d007
  [1474521.694954] Mem abort info:
  [1474521.694961]   ESR = 0x96000005
  [1474521.694967]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.694970]   SET = 0, FnV = 0
  [1474521.694972]   EA = 0, S1PTW = 0
  [1474521.694975] Data abort info:
  [1474521.694980]   ISV = 0, ISS = 0x00000005
  [1474521.694987] Unable to handle kernel paging request at virtual address 
ffff8027ce4e0007
  [1474521.694990]   CM = 0, WnR = 0
  [1474521.694995] Mem abort info:
  [1474521.695000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.695001]   ESR = 0x96000005
  [1474521.695004] [ffff8027ce47d007] pgd=00002027fffff003
  [1474521.695009]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.695010] , pud=0000000000000000
  [1474521.695015]   SET = 0, FnV = 0
  [1474521.695020]   EA = 0, S1PTW = 0
  [1474521.695024] Data abort info:
  [1474521.695027]   ISV = 0, ISS = 0x00000005
  [1474521.695032]   CM = 0, WnR = 0
  [1474521.695036] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.695041] [ffff8027ce4e0007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.695824] Unable to handle kernel paging request at virtual address 
ffff8027ce333007
  [1474521.695836] Mem abort info:
  [1474521.695840]   ESR = 0x96000005
  [1474521.695844]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.695849]   SET = 0, FnV = 0
  [1474521.695852]   EA = 0, S1PTW = 0
  [1474521.695855] Data abort info:
  [1474521.695860]   ISV = 0, ISS = 0x00000005
  [1474521.695864]   CM = 0, WnR = 0
  [1474521.695868] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.695871] [ffff8027ce333007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.696447] Hardware name: [About Privacy Deleted], BIOS 1.39 06/11/2020
  [1474521.696449] Call trace:
  [1474521.696458]  dump_backtrace+0x0/0x1a8
  [1474521.696462]  show_stack+0x24/0x30
  [1474521.696466]  dump_stack+0xbc/0x118
  [1474521.696469]  panic+0x160/0x3a0
  [1474521.696475]  __schedule+0x788/0x790
  [1474521.696479]  schedule+0x38/0xa8
  [1474521.696482]  schedule_hrtimeout_range_clock+0x98/0x108
  [1474521.696485]  schedule_hrtimeout_range+0x38/0x48
  [1474521.696490]  do_select+0x448/0x658
  [1474521.696493]  core_sys_select+0x478/0x990
  [1474521.696496]  __arm64_sys_pselect6+0x2d0/0x7a0
  [1474521.696500]  el0_svc_common.constprop.2+0x80/0x1e8
  [1474521.696502]  el0_svc_handler+0x34/0xa0
  [1474521.696505]  el0_svc+0x10/0x2c8
  [1474521.696549] SMP: stopping secondary CPUs
  [1474521.696987] Unable to handle kernel paging request at virtual address 
ffff8027ce3b7007
  [1474521.696999] Mem abort info:
  [1474521.697001]   ESR = 0x96000005
  [1474521.697009]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.697012]   SET = 0, FnV = 0
  [1474521.697016]   EA = 0, S1PTW = 0
  [1474521.697020] Data abort info:
  [1474521.697024]   ISV = 0, ISS = 0x00000005
  [1474521.697027]   CM = 0, WnR = 0
  [1474521.697034] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.697039] [ffff8027ce3b7007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.701868] Unable to handle kernel paging request at virtual address 
ffff8027ce2af007
  [1474521.701878] Mem abort info:
  [1474521.701881]   ESR = 0x96000005
  [1474521.701885]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.701886]   SET = 0, FnV = 0
  [1474521.701890]   EA = 0, S1PTW = 0
  [1474521.701892] Data abort info:
  [1474521.701895]   ISV = 0, ISS = 0x00000005
  [1474521.701897]   CM = 0, WnR = 0
  [1474521.701901] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.701905] [ffff8027ce2af007] pgd=00002027fffff003, pud=0000000000000000
  [1474521.705040] Unable to handle kernel paging request at virtual address 
ffff2028b64886ff
  [1474521.705187] Unable to handle kernel paging request at virtual address 
ffff8027ce45c007
  [1474521.705189] Mem abort info:
  [1474521.705191]   ESR = 0x96000005
  [1474521.705194]   EC = 0x25: DABT (current EL), IL = 32 bits
  [1474521.705196]   SET = 0, FnV = 0
  [1474521.705197]   EA = 0, S1PTW = 0
  [1474521.705198] Data abort info:
  [1474521.705200]   ISV = 0, ISS = 0x00000005
  [1474521.705201]   CM = 0, WnR = 0
  [1474521.705204] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000014ac000
  [1474521.705206] [ffff8027ce45c007] pgd=00002027fffff003, pud=0000000000000000
  [1474522.786325] SMP: failed to stop secondary CPUs 0-6,8-13,15-47
  [1474522.791443] Starting crashdump kernel...
  [1474522.791447] ------------[ cut here ]------------
  [1474522.791448] Some CPUs may be stale, kdump will be unreliable.
  [1474522.791482] WARNING: CPU: 7 PID: 5387 at 
/build/linux-hwe-5.4-E9a0r6/linux-hwe-5.4-5.4.0/arch/arm64/kernel/machine_kexec.c:156
 machine_kexec+0x58/0x418
  [1474522.791485] Modules linked in: binfmt_misc xt_MASQUERADE iptable_nat 
nf_nat xt_tcpudp xt_multiport xt_conntrack nf_conntrack nf_defrag_ipv6 
nf_defrag_ipv4 iptable_filter bpfilter rpcsec_gss_krb5 nfsv4 nfs fscache 
bonding nls_iso8859_1 ipmi_ssif joydev input_leds hns_roce_hw_v2 ib_uverbs 
ipmi_si spi_dw_mmio ipmi_devintf ipmi_msghandler spi_dw hisi_dma cppc_cpufreq 
sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp 
libiscsi scsi_transport_iscsi nfsd auth_rpcgss nfs_acl lockd grace sunrpc 
ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov 
async_memcpy async_pq async_xor async_tx xor xor_neon raid6_pq libcrc32c raid1 
raid0 multipath linear ses enclosure mlx5_ib(OE) hibmc_drm realtek 
drm_vram_helper ttm drm_kms_helper hid_generic crct10dif_ce syscopyarea 
sysfillrect ghash_ce mlx5_core(OE) sysimgblt hisi_sas_v3_hw sha2_ce hns3 
hisi_sas_main sha256_arm64 fb_sys_fops mlx_compat(OE) sha1_ce hclge libsas 
usbhid tls drm hid hnae3 megaraid_sas ahci
  [1474522.791658]  scsi_transport_sas mlxfw(OE) gpio_dwapb aes_neon_bs 
aes_neon_blk aes_ce_blk crypto_simd cryptd aes_ce_cipher
  [1474522.791679] CPU: 7 PID: 5387 Comm: query_event Kdump: loaded Tainted: G  
    D    OE     5.4.0-47-generic #51~18.04.1-Ubuntu
  [1474522.791681] Hardware name: [About Privacy Deleted], BIOS 1.39 06/11/2020
  [1474522.791684] pstate: 40400089 (nZcv daIf +PAN -UAO)
  [1474522.791688] pc : machine_kexec+0x58/0x418
  [1474522.791692] lr : machine_kexec+0x58/0x418
  [1474522.791693] sp : ffff8000284b3460
  [1474522.791695] x29: ffff8000284b3460 x28: 0000000000000000 
  [1474522.791698] x27: 0000000000000000 x26: ffff8000284b3cd8 
  [1474522.791700] x25: 0000000000000000 x24: ffff800011b78000 
  [1474522.791702] x23: ffff800011df0000 x22: ffff0027d8c13000 
  [1474522.791705] x21: 0000000000000000 x20: ffff800011baa000 
  [1474522.791707] x19: ffff0027d8c13000 x18: ffffffffffffffff 
  [1474522.791709] x17: 0000000000000000 x16: 0000000000000000 
  [1474522.791711] x15: ffff800011b78908 x14: 0000000060000089 
  [1474522.791714] x13: ffff8000101d34c0 x12: ffff800011b9e000 
  [1474522.791716] x11: 0000000000000000 x10: ffff800011dab000 
  [1474522.791718] x9 : 0000000000000000 x8 : ffff2027d81a7533 
  [1474522.791720] x7 : 0000000000000000 x6 : ffff0027df9d1248 
  [1474522.791722] x5 : 0000000000000007 x4 : ffff0027df9d1248 
  [1474522.791724] x3 : 0000000000000006 x2 : 0000000000000007 
  [1474522.791727] x1 : ed5ea55acfa5ca00 x0 : 0000000000000000 
  [1474522.791730] Call trace:
  [1474522.791735]  machine_kexec+0x58/0x418
  [1474522.791743]  __crash_kexec+0x84/0x130
  [1474522.791747]  panic+0x17c/0x3a0
  [1474522.791752]  __schedule+0x788/0x790
  [1474522.791755]  schedule+0x38/0xa8
  [1474522.791758]  schedule_hrtimeout_range_clock+0x98/0x108
  [1474522.791760]  schedule_hrtimeout_range+0x38/0x48
  [1474522.791765]  do_select+0x448/0x658
  [1474522.791768]  core_sys_select+0x478/0x990
  [1474522.791772]  __arm64_sys_pselect6+0x2d0/0x7a0
  [1474522.791775]  el0_svc_common.constprop.2+0x80/0x1e8
  [1474522.791777]  el0_svc_handler+0x34/0xa0
  [1474522.791783]  el0_svc+0x10/0x2c8
  [1474522.791785] ---[ end trace 0242a0b3e3a7dec2 ]---
  [1474522.791791] Bye!

  [Additional information]
  Ubuntu 18.04.5
  kernel 5.4.0-47-generic

  [Resolution]

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