Upstream has gone ahead and reverted the problematic patches, and they
are flowing into the various stable trees.

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

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

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => dann frazier (dannf)

** Changed in: linux (Ubuntu Impish)
     Assignee: (unassigned) => dann frazier (dannf)

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https://bugs.launchpad.net/bugs/1952933

Title:
  impish kernel crashes on hp m400 in mlx4_en_poll_rx_cq

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Impish:
  In Progress

Bug description:
  During MAAS deployment:

  [  107.768146] Unable to handle kernel read from unreadable memory at
  virtual address 0000000000000000

   domain : maas                                                [  107.943413] 
Mem abort info:
              
   rootserver: 10.229.32.21 rootpath: 
   filename  :[  108.043666]   ESR = 0x96000004
   lpxelinux.0
  :: root=squash:http://10.229.32.21:5248/images/ubu[  108.147045]   EC = 0x25: 
DABT (current EL), IL = 32 bits
  ntu/arm64/xgene-uboot/impish/stable/squashfs
  :: mount_squash do[  108.277541]   SET = 0, FnV = 0
  wnloading http://10.229.32.21:5248/images/ubuntu/arm64/xgene-ubo[  
108.380921]   EA = 0, S1PTW = 0
  ot/impish/stable/squashfs to /root.tmp.img
  Connecting to 10.229[  108.485351] Data abort info:
  .32.21:5248 (10.229.32.21:5248)
  [  108.586639]   ISV = 0, ISS = 0x00000004
  [  108.667060]   CM = 0, WnR = 0
  [  108.702635] user pgtable: 4k pages, 48-bit VAs, pgdp=000000401ce02000
  root.tmp.img         [  108.779941] [0000000000000000] pgd=0000000000000000, 
p4d=0000000000000000
    4% [  108.884372] Internal error: Oops: 96000004 [#1] SMP
  [  108.948102] Modules linked in: 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_keys_polled gpio_dwapb crct10dif_ce ahci_xgene gpio_xgene_sb aes_neon_bs 
aes_neon_blk crypto_simd cryptd
  [  109.286243] CPU: 0 PID: 11 Comm: ksoftirqd/0 Not tainted 5.13.0-20-generic 
#20-Ubuntu
  [  109.380233] Hardware name: HP ProLiant m400 Server Cartridge (DT)
  [  109.453258] pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)
  [  109.525342] pc : mlx4_en_poll_rx_cq+0xb4/0x17c [mlx4_en]
  [  109.589087] lr : mlx4_en_poll_rx_cq+0x7c/0x17c [mlx4_en]
  [  109.652828] sp : ffff8000129cbc60
  [  109.692470] x29: ffff8000129cbc60 x28: 000000000000012c x27: 
ffff000ff7e95fc0
  [  109.778115] x26: 00000000ffffffff x25: ffff000020908508 x24: 
ffff000021b40940
  [  109.863763] x23: ffff000020908508 x22: ffff000020908400 x21: 
ffff000021b40000
  [  109.949409] x20: 0000000000000040 x19: 0000000000000040 x18: 
0000000000000014
  [  110.035056] x17: 000000001122e350 x16: 00000000cb46f8bb x15: 
00000000e2b6a183
  [  110.120703] x14: 0000000026fff11e x13: 000000009312ff0b x12: 
0000000000000000
  [  110.206349] x11: 0000000000000006 x10: 0000000000000040 x9 : 
ffff800009119320
  [  110.291997] x8 : ffff000008acdc00 x7 : 00000000000002c0 x6 : 
00000000ffffdff8
  [  110.377642] x5 : ffff000003940000 x4 : ffff000003960040 x3 : 
ffff000021c20000
  [  110.463289] x2 : 0000000000000000 x1 : 0000000000000000 x0 : 
0000000000000000
  [  110.548937] Call trace:
  [  110.578147]  mlx4_en_poll_rx_cq+0xb4/0x17c [mlx4_en]
  [  110.637719]  __napi_poll+0x40/0x1e0
  [  110.679551]  net_rx_action+0x2d8/0x34c
  [  110.724513]  __do_softirq+0x128/0x388
  [  110.768432]  run_ksoftirqd+0x6c/0x94
  [  110.811308]  smpboot_thread_fn+0x15c/0x1a0
  [  110.860443]  kthread+0x114/0x120
  [  110.899145]  ret_from_fork+0x10/0x18
  [  110.942024] Code: 1100fc41 1a82b021 13067c21 93407c21 (f8617800) 
  [  111.015158] ---[ end trace b37ae99414884442 ]---
  [  111.070550] Kernel panic - not syncing: Oops: Fatal exception in interrupt
  [  111.152964] SMP: stopping secondary CPUs
  [  111.200016] Kernel Offset: 0x80000 from 0xffff800010000000
  [  111.265837] PHYS_OFFSET: 0x4000000000
  [  111.309651] CPU features: 0x00000251,00000046
  [  111.361915] Memory Limit: none
  [  111.398431] ---[ end Kernel panic - not syncing: Oops: Fatal exception in 
interrupt ]---

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