** Tags added: cscc

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https://bugs.launchpad.net/bugs/1789118

Title:
  Fails to boot under Xen PV: BUG: unable to handle kernel paging
  request at edc21fd9

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  == SRU Justification ==
  After an upgrade to Bionic, the bug reporter states the 32-bit kernel
  does not boot under Xen PV mode.  This bug does not affect 64-bit
  kernels and if fixed by mainline commit 6a92b11169a6.

  == Fix ==
  6a92b11169a6 ("x86/EISA: Don't probe EISA bus for Xen PV guests")

  == Regression Potential ==
  Low.  This commit only affects x86 kernels.  This commit has also been cc'd 
to upstream stable, so it has had
  additional upstream review.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.

  
  After the most recent 18.04 32-bit upgrade of linux-image-generic, it now 
refuses to boot under Xen PV mode:

  .
  .
  .
  [    0.114370] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, 
max_idle_ns: 7645041785100000 ns
  [    0.114382] futex hash table entries: 256 (order: 2, 16384 bytes)
  [    0.114423] pinctrl core: initialized pinctrl subsystem
  [    0.134326] RTC time: 165:165:165, date: 165/165/65
  [    0.134442] NET: Registered protocol family 16
  [    0.134457] xen:grant_table: Grant tables using version 1 layout
  [    0.134502] Grant table initialized
  [    0.134544] audit: initializing netlink subsys (disabled)
  [    0.134611] audit: type=2000 audit(1535307799.132:1): state=initialized 
audit_enabled=0 res=1
  [    0.134678] EISA bus registered
  [    0.136019] PCI: setting up Xen PCI frontend stub
  [    0.136073] BUG: unable to handle kernel paging request at edc21fd9
  [    0.136084] IP: eisa_bus_probe+0x19/0x36
  [    0.136089] *pdpt = 0000000001ee6027 *pde = 0000000029cc6067 *pte = 
0000000000000000
  [    0.136100] Oops: 0000 [#1] SMP
  [    0.136105] Modules linked in:
  [    0.136111] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.15.0-33-generic 
#36-Ubuntu
  [    0.136120] EIP: eisa_bus_probe+0x19/0x36
  [    0.136125] EFLAGS: 00010246 CPU: 0
  [    0.136130] EAX: edc21fd9 EBX: 00000000 ECX: 01e0d000 EDX: 00000200
  [    0.136138] ESI: c1d0d452 EDI: c1dd34a4 EBP: e9c89f24 ESP: e9c89f24
  [    0.136145]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: e021
  [    0.136154] CR0: 80050033 CR2: edc21fd9 CR3: 01e10000 CR4: 00042660
  [    0.136166] Call Trace:
  [    0.136173]  do_one_initcall+0x49/0x174
  [    0.136179]  ? parse_args+0x143/0x390
  [    0.136187]  ? set_debug_rodata+0x14/0x14
  [    0.136193]  kernel_init_freeable+0x149/0x1c5
  [    0.136201]  ? rest_init+0xa0/0xa0
  [    0.136207]  kernel_init+0xd/0xf0
  [    0.136213]  ret_from_fork+0x2e/0x38
  [    0.140000] Code: ff b8 df 43 ae c1 e8 35 1b 88 ff e8 20 12 88 ff c9 c3 3e 
8d 74 26 00 55 b9 04 00 00 00 31 d2 b8 d9 ff 0f 00 89 e5 e8 35 8d 35 ff <8b> 10 
81 fa 45 49 53 41 75 0a c7 05 a0 76 ed c1 01 00 00 00 e8
  [    0.140000] EIP: eisa_bus_probe+0x19/0x36 SS:ESP: e021:e9c89f24
  [    0.140000] CR2: 00000000edc21fd9
  [    0.140000] ---[ end trace 8c00b3cb7d4f06ba ]---
  [    0.140013] Kernel panic - not syncing: Attempted to kill init! 
exitcode=0x00000009

  This is: [    0.000000] Linux version 4.15.0-33-generic
  (buildd@lgw01-amd64-038) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3))
  #36-Ubuntu SMP Wed Aug 15 13:44:35 UTC 2018 (Ubuntu
  4.15.0-33.36-generic 4.15.18)

  Switching to a 64-bit kernel allows boot to proceed.

  I cannot include output of the commands you request (uname,
  version_signature, dmesg, lspci) because the guest doesn't boot. The
  above kernel output is from a just-installed clean guest however.

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