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[Launchpad Bug Tracker <1784454@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 229-4ubuntu21.4

---------------
systemd (229-4ubuntu21.4) xenial; urgency=medium

  * debian/extra/start-udev: test that sync parameters file is writable, before
    writing to it. On old kernels (e.g. v4.4) the file is available but is
    read-only, thus writing to it causes init to fail and thus raise a kernel
    panic. As an extra caution ignore failures to write into that file anyway,
    since synchronous scsi probing is not critical enough to prevent starting
    d-i. LP: #1784454

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Mon, 30 Jul 2018 19:58:15
+0100

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1784454

Title:
  kernel panic on booting kernel 4.4 based d-i from 16.04.5 RC image

Status in debian-installer package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  New
Status in systemd source package in Xenial:
  Fix Released

Bug description:
  Booting d-i based on kernel 4.4 (from ./boot folder) from the 16.04.5 RC image on a z/VM guest
  leads to a kernel panic:

  /lib/debian-installer/start-udev: line 15: can't create /sys/module/scsi_mod/par
  ameters/scan: Permission denied 
  ¬    0.845071| Kernel panic - not syncing: Attempted to kill initÜ exitcode=0x00
  000100 
  ¬    0.845071|  
  ¬    0.845075| CPU: 0 PID: 1 Comm: /init Not tainted 4.4.0-131-generic #157-Ubun
  tu 
  ¬    0.845077|        000000007d107c20 000000007d107cb0 0000000000000002 0000000
  000000000  
         000000007d107d50 000000007d107cc8 000000007d107cc8 0000000000114732  
         000000000000008b 00000000009a304c 00000000009f11d0 000000000000000b  
         000000007d107d10 000000007d107cb0 0000000000000000 0000000000000000  
         0400000001cdf800 0000000000114732 000000007d107cb0 000000007d107d10  
  ¬    0.845089| Call Trace: 
  ¬    0.845093| (¬<000000000011461a>| show_trace+0xfa/0x150) 
  ¬    0.845095|  ¬<00000000001146e2>| show_stack+0x72/0xf8 
  ¬    0.845099|  ¬<0000000000555752>| dump_stack+0x82/0xb8 
  ¬    0.845101|  ¬<0000000000286390>| panic+0x108/0x250 
  ¬    0.845104|  ¬<0000000000166228>| do_exit+0xac0/0xba0 
  ¬    0.845106|  ¬<00000000001663c8>| do_group_exit+0x50/0xe0 
  ¬    0.845108|  ¬<0000000000166488>| __wake_up_parent+0x0/0x28 
  ¬    0.845111|  ¬<00000000007eadda>| system_call+0xee/0x28c 
  ¬    0.845113|  ¬<000003ff8953983a>| 0x3ff8953983a 
  00: HCPGIR450W CP entered; disabled wait PSW 00020001 80000000 00000000 0010F8CA

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