[Qemu-devel] [Bug 1739371] Re: qemu-system-arm snapshot loadvm core dumped

[Gustavo Moreira]

** Tags added: qemu-system-arm snapshot snapshots vexpress-a15

** Tags added: arm

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Title:
  qemu-system-arm snapshot loadvm core dumped

Status in QEMU:
  New

Bug description:
  Ubuntu Qemu is crashing trying to restore saved snapshot in qemu-system-arm.
  I've tried different guests kernels, but I wasn't lucky with any of them.

  The guest vm boots and I can use it normally. The issue is when I save
  the snapshot using "savevm Base0", "quit" and then I restore that
  snapshot using "-loadvm Base0" from the cmd line.

  The only difference I've noticed is tweaking the guest memory:
  * With -m 512 or 1024 it crashes as you can see below.
  * With -m 2048 it doesn't crash, it restores the vm and I can see the screen 
as it was, but the OS is halted. And it's not just the keyboard. I've tried 
saving the snapshot while it's booting with lot of lines being printed on 
screen and after restoring it, the OS is frozen.

  I also tried limiting the guest kernel memory using the mem parameter
  (mem=2048M) and disabling the kernel address space randomization
  (nokaslr) with the same results.

  OS: Ubuntu 16.04.3 LTS (xenial)

  $ qemu-system-arm --version
  QEMU emulator version 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.16), Copyright (c) 
2003-2008 Fabrice Bellard

  $ qemu-system-arm -kernel kernel/vmlinuz-4.10.0-42-generic -initrd 
kernel/initrd.img-4.10.0-42-generic -M vexpress-a15 -m 512 -append 
'root=/dev/mmcblk0 rootwait console=tty0' -sd vexpress-4G.qcow2 -dtb 
device-tree/vexpress-v2p-ca15-tc1.dtb  -loadvm Base0
  pulseaudio: set_sink_input_volume() failed
  pulseaudio: Reason: Invalid argument
  pulseaudio: set_sink_input_mute() failed
  pulseaudio: Reason: Invalid argument
  qemu: fatal: Trying to execute code outside RAM or ROM at 0xc0321568

  R00=00000001 R01=00000000 R02=00000000 R03=c0321560
  R04=c1500000 R05=c150529c R06=c1505234 R07=c14384d0
  R08=00000000 R09=00000000 R10=c1501f50 R11=c1501f3c
  R12=c1501f40 R13=c1501f30 R14=c030a184 R15=c0321568
  PSR=60070093 -ZC- A S svc32
  s00=6374652f s01=636f6c2f d00=636f6c2f6374652f
  s02=7273752f s03=6962732f d01=6962732f7273752f
  s04=6e612f6e s05=6f726361 d02=6f7263616e612f6e
  s06=7c7c206e s07=63202820 d03=632028207c7c206e
  s08=202f2064 s09=72202626 d04=72202626202f2064
  s10=702d6e75 s11=73747261 d05=73747261702d6e75
  s12=722d2d20 s13=726f7065 d06=726f7065722d2d20
  s14=652f2074 s15=632f6374 d07=632f6374652f2074
  s16=00000000 s17=00000000 d08=0000000000000000
  s18=00000000 s19=00000000 d09=0000000000000000
  s20=00000000 s21=00000000 d10=0000000000000000
  s22=00000000 s23=00000000 d11=0000000000000000
  s24=00000000 s25=00000000 d12=0000000000000000
  s26=00000000 s27=00000000 d13=0000000000000000
  s28=00000000 s29=00000000 d14=0000000000000000
  s30=00000000 s31=00000000 d15=0000000000000000
  s32=00000000 s33=00000000 d16=0000000000000000
  s34=00000000 s35=00000000 d17=0000000000000000
  s36=00000000 s37=00000000 d18=0000000000000000
  s38=00000000 s39=00000000 d19=0000000000000000
  s40=00000000 s41=00000000 d20=0000000000000000
  s42=00000000 s43=00000000 d21=0000000000000000
  s44=00000000 s45=00000000 d22=0000000000000000
  s46=00000000 s47=00000000 d23=0000000000000000
  s48=00000000 s49=00000000 d24=0000000000000000
  s50=00000000 s51=00000000 d25=0000000000000000
  s52=00000000 s53=00000000 d26=0000000000000000
  s54=00000000 s55=00000000 d27=0000000000000000
  s56=00000000 s57=00000000 d28=0000000000000000
  s58=00000000 s59=00000000 d29=0000000000000000
  s60=00000000 s61=00000000 d30=0000000000000000
  s62=00000000 s63=00000000 d31=0000000000000000
  FPSCR: 00000000
  Aborted (core dumped)

  As I said above, the same happens when -m 1024 is used.

  I have a different issue when I use the qemu git master version, but
  I'm submiting a different ticket for that.

  Cheers,
  Gus

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