We are also affected on this problem on 3 Ubuntu 18.04 vms since the
kernel 5.0.0-1032-azure has been installed (automatically installed
after a reboot of the server).

The Linux vms with older kernel (that have not been restarted) are not
affected.

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https://bugs.launchpad.net/bugs/1863978

Title:
  boot failing - unable to handle kernel paging request - followed by
  oops

Status in linux-azure package in Ubuntu:
  Confirmed

Bug description:
  After update to Ubuntu 5.0.0-1032.34-azure 5.0.21, VM is not able to
  boot anymore.

  Keeps stuck in logging "soft lockup - CPU#xxx stuck for xxs" with
  random process (different on each startup).

  Full logs below.

  Relevant boot logs:
  (...)
  [  OK  ] Started 
/var/lib/waagent/Microsoft.…0.0.7820/scripts/enableHandler.py.
  [   14.836987] PKCS#7 signature not signed with a trusted key
  [   14.856290] PKCS#7 signature not signed with a trusted key
  [   15.123087] BUG: unable to handle kernel paging request at 000000003fffffa9
  [   15.123905] #PF error: [normal kernel read fault]
  [   15.123905] PGD 800000084ab2c067 P4D 800000084ab2c067 PUD 8586cb067 PMD 0 
  [   15.135982] Oops: 0000 [#1] SMP PTI
  [   15.135982] CPU: 4 PID: 3561 Comm: microsoft-depen Tainted: P           OE 
    5.0.0-1032-azure #34-Ubuntu
  [   15.135982] Hardware name: Microsoft Corporation Virtual Machine/Virtual 
Machine, BIOS 090007  06/02/2017
  [   15.135982] RIP: 0010:iterate_extants+0x155/0x380 
[microsoft_dependency_agent]
  [   15.135982] Code: ab c0 4c 89 e7 e8 bb 9b 0c e8 49 8b 44 24 08 48 85 c0 74 
71 4d 8b 7c 24 08 49 83 ef 68 75 0b eb 64 49 83 ea 68 4d 89 d7 74 5b <41> 0f b7 
47 10 83 e0 f7 66 83 f8 02 75 44 41 80 bf 01 02 00 00 06
  [   15.171900] RSP: 0018:ffffbd46489cbb10 EFLAGS: 00010216
  [   15.171900] RAX: 0000000040000001 RBX: ffffbd46489cbb30 RCX: 
0000000000000de9
  [   15.171900] RDX: 0000000000000001 RSI: 0000000000000008 RDI: 
ffffffffa9ae5280
  [   15.171900] RBP: ffffbd46489cbb80 R08: 0000000000000001 R09: 
000000000000024f
  [   15.171900] R10: ffffbd46489cbb98 R11: 0000000000000000 R12: 
ffffffffa9ae5280
  [   15.171900] R13: ffffffffc0ab59d0 R14: 0000000000000000 R15: 
000000003fffff99
  [   15.171900] FS:  00007f365b7e1440(0000) GS:ffff98541dd00000(0000) 
knlGS:0000000000000000
  [   15.171900] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [   15.171900] CR2: 000000003fffffa9 CR3: 000000084c1c6002 CR4: 
00000000003606e0
  [   15.171900] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [   15.171900] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [   15.171900] Call Trace:
  [   15.171900]  ? bs_release+0x1b0/0x1b0 [microsoft_dependency_agent]
  [   15.171900]  bs_open+0x2fd/0x580 [microsoft_dependency_agent]
  [   15.171900]  ? bs_open+0x2fd/0x580 [microsoft_dependency_agent]
  [   15.171900]  ? bs_write+0x90/0x90 [microsoft_dependency_agent]

  (...)
  [   45.331952] watchdog: BUG: soft lockup - CPU#2 stuck for 23s! [nginx:4876]
  [   45.336115] Modules linked in: microsoft_dependency_agent(POE) 
bluechannel(POE) veth ipt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user 
xfrm_algo xt_addrtype br_netfilter bridge stp llc xt_owner iptable_security 
aufs overlay xt_conntrack xt_tcpudp iptable_filter xt_nat iptable_nat 
nf_nat_ipv4 nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bpfilter 
nls_iso8859_1 kvm_intel kvm irqbypass serio_raw hv_balloon joydev 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 crct10dif_pclmul crc32_pclmul 
ghash_clmulni_intel aesni_intel hid_generic aes_x86_64 hid_hyperv crypto_simd 
cryptd hyperv_fb glue_helper cfbfillrect pata_acpi hyperv_keyboard hid 
hv_netvsc cfbimgblt cfbcopyarea hv_utils
  [   45.395981] CPU: 2 PID: 4876 Comm: nginx Tainted: P      D    OE     
5.0.0-1032-azure #34-Ubuntu
  [   45.400558] Hardware name: Microsoft Corporation Virtual Machine/Virtual 
Machine, BIOS 090007  06/02/2017
  [   45.408757] RIP: 0010:hv_qlock_wait+0x25/0x60
  [   45.411928] Code: 38 be 00 5d c3 0f 1f 44 00 00 55 48 89 e5 53 65 8b 05 2f 
75 df 57 a9 00 00 10 00 75 0d 9c 5b fa 0f b6 07 40 38 c6 74 05 53 9d <5b> 5d c3 
b9 f0 00 00 40 0f 32 0f 1f 44 00 00 eb ed 48 c1 e2 20 bf
  [   45.424104] RSP: 0018:ffffbd46493a3d60 EFLAGS: 00000246 ORIG_RAX: 
ffffffffffffff12
  [   45.431986] RAX: 0000000000000000 RBX: 0000000000000246 RCX: 
00000000400000f0
  [   45.437191] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 
ffffffffa9ae5280
  [   45.440905] RBP: ffffbd46493a3d68 R08: 0000000000000009 R09: 
00000000000000d8
  [   45.447992] R10: 0000000000000000 R11: 0000000000000000 R12: 
ffff98541dca2000
  [   45.452055] R13: 0000000000000001 R14: 0000000000000100 R15: 
0000000000000000
  [   45.457386] FS:  00007faee231fd48(0000) GS:ffff98541dc80000(0000) 
knlGS:0000000000000000
  [   45.459920] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [   45.469462] CR2: 00007faee132b000 CR3: 000000082287a004 CR4: 
00000000003606e0
  [   45.474543] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [   45.479975] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [   45.484781] 
  (...)


  Last successful boot log:
  https://pastebin.com/uVgcQCUC

  One of the failing boot logs after updating:
  https://pastebin.com/D0jnbHDb

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