** Changed in: linux (Ubuntu Disco)
     Assignee: (unassigned) => Marcelo Cerri (mhcerri)

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https://bugs.launchpad.net/bugs/1859582

Title:
  System hang with kernel traces while entering reboot process on a
  Disco ARM64 moonshot node

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Disco:
  Fix Committed

Bug description:
  This issue occurs on a Moonshot node, the node was just deployed by
  MAAS, but it never came back after the reboot command.

  Here is the console output:

  [  OK  ] Started Reboot.
  [  OK  ] Reached target Reboot.
  [  450.084108] kernel BUG at mm/slub.c:305!
  [  450.131160] Internal error: Oops - BUG: 0 [#1] SMP
  [  450.188640] Modules linked in: dm_multipath scsi_dh_rdac scsi_dh_emc 
scsi_dh_alua gpio_keys_polled input_polldev crct10dif_ce xgene_rng 
mailbox_xgene_slimpro uio_pdrv_genirq uio sch_fq_codel ib_iser rdma_cm iw_cm 
ib_cm 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 xor_neon raid6_pq libcrc32c raid1 raid0 
multipath linear mlx4_ib ib_uverbs ib_core mlx4_en mlx4_core gpio_dwapb devlink 
ahci_xgene gpio_xgene_sb
  [  450.758357] Process shutdown (pid: 1, stack limit = 0x00000000cb9d7b95)
  [  450.837642] CPU: 2 PID: 1 Comm: shutdown Not tainted 5.0.0-38-generic 
#41-Ubuntu
  [  450.926416] Hardware name: HP ProLiant m400 Server Cartridge (DT)
  [  450.999441] pstate: 60400005 (nZCv daif +PAN -UAO)
  [  451.056823] pc : __slab_free+0x170/0x3d8
  [  451.103865] lr : kfree+0x1b4/0x1c8
  [  451.144549] sp : ffff000017c2b950
  [  451.184190] x29: ffff000017c2b950 x28: ffff00001173c708 
  [  451.247825] x27: 0000000000000010 x26: ffff7e003e700220 
  [  451.311461] x25: 0000000000000002 x24: ffff800f9c00a000 
  [  451.375095] x23: ffff800ff6003800 x22: 0000000000000000 
  [  451.438731] x21: 0000000080200008 x20: ffff800f9c00a000 
  [  451.502365] x19: ffff7e003e700200 x18: 0000000000000000 
  [  451.566001] x17: 0000000000000000 x16: 0000000000000000 
  [  451.629637] x15: ffff000010fb7f30 x14: ffff800fab1ef390 
  [  451.693271] x13: ffff800ff5a59020 x12: 0000000000000000 
  [  451.756906] x11: ffff800ff5a58ff8 x10: 0000000000000040 
  [  451.820542] x9 : ffff800fab1ef398 x8 : 0000000000000001 
  [  451.884178] x7 : ffff800f9c00a000 x6 : 0000000000000001 
  [  451.947812] x5 : 0000000000210d00 x4 : 0000000000000001 
  [  452.011448] x3 : ffff800f9c00a000 x2 : 0000000000000000 
  [  452.075083] x1 : 0000000040000000 x0 : 0000000000210d00 
  [  452.138719] Call trace:
  [  452.167930]  __slab_free+0x170/0x3d8
  [  452.210700]  kfree+0x1b4/0x1c8
  [  452.247217]  cm_remove_one+0x21c/0x2b0 [ib_cm]
  [  452.300540]  ib_unregister_device+0x100/0x218 [ib_core]
  [  452.363237]  mlx4_ib_remove+0x84/0x1f8 [mlx4_ib]
  [  452.418655]  mlx4_remove_device+0xcc/0xf8 [mlx4_core]
  [  452.479272]  mlx4_unregister_device+0x84/0x158 [mlx4_core]
  [  452.545104]  mlx4_unload_one+0x88/0x2c8 [mlx4_core]
  [  452.603634]  mlx4_shutdown+0x70/0x88 [mlx4_core]
  [  452.659025]  pci_device_shutdown+0x44/0x88
  [  452.708159]  device_shutdown+0x134/0x240
  [  452.755207]  kernel_restart_prepare+0x44/0x50
  [  452.807469]  kernel_restart+0x20/0x68
  [  452.851284]  __se_sys_reboot+0x10c/0x230
  [  452.898228]  __arm64_sys_reboot+0x24/0x30
  [  452.946216]  el0_svc_common+0xa0/0x168
  [  452.991073]  el0_svc_handler+0x38/0x78
  [  453.035930]  el0_svc+0x8/0xc
  [  453.070357] Code: 8b020303 eb14031f 54fff921 d503201f (d4210000) 
  [  453.143490] ---[ end trace 6177acd8b3b927ab ]---
  [  453.201910] printk: shutdown: 4 output lines suppressed due to ratelimiting
  [  453.285555] Kernel panic - not syncing: Attempted to kill init! 
exitcode=0x0000000b
  [  453.377460] Kernel Offset: disabled
  [  453.419286] CPU features: 0x000,20802000
  [  453.466230] Memory Limit: none
  [  453.502745] ---[ end Kernel panic - not syncing: Attempted to kill init! 
exitcode=0x0000000b ]---

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