[Qemu-devel] [Bug 1751674] [NEW] qemu-system-arm segmentation fault trying to dump VM memory

[Qemu-devel] [Bug 1751674] [NEW] qemu-system-arm segmentation fault trying to dump VM memory

[Gustavo Moreira]

Public bug reported:

Qemu segfaults trying to generate a VM memory dump:

$ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:DE:AD:BE:FF:02,netdev=net0  -monitor stdio -serial vc  -loadvm SS0
QEMU 2.11.50 monitor - type 'help' for more information
(qemu) pmemsave 0 0x3FFFFFFF memory.dmp
Segmentation fault (core dumped)

$ git rev-parse HEAD
b384cd95eb9c6f73ad84ed1bb0717a26e29cc78f

It's the second time I try to submit this bug, I think last time it
failed because the attached core dump size (400M compressed). Have a
look if you can get that file, otherwise I will try to update this
ticket once it's created:

(Error ID: OOPS-65553b72bc14be693eb1e37814ff9267)

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: arm dump memory pmemsave segfault

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Title:
  qemu-system-arm segmentation fault trying to dump VM memory

Status in QEMU:
  New

Bug description:
  Qemu segfaults trying to generate a VM memory dump:

  $ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:DE:AD:BE:FF:02,netdev=net0  -monitor stdio -serial vc  -loadvm SS0
  QEMU 2.11.50 monitor - type 'help' for more information
  (qemu) pmemsave 0 0x3FFFFFFF memory.dmp
  Segmentation fault (core dumped)

  $ git rev-parse HEAD
  b384cd95eb9c6f73ad84ed1bb0717a26e29cc78f

  It's the second time I try to submit this bug, I think last time it
  failed because the attached core dump size (400M compressed). Have a
  look if you can get that file, otherwise I will try to update this
  ticket once it's created:

  (Error ID: OOPS-65553b72bc14be693eb1e37814ff9267)

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[Qemu-devel] [Bug 1751674] Re: qemu-system-arm segmentation fault trying to dump VM memory

[Gustavo Moreira]

Yeah, the page fails uploading the code dump file. Actually it seems to
upload the whole file but then it shows a "Timeout error" error. Anyway,
let me know if you need that file and if so how can I send it to you.

** Description changed:

  Qemu segfaults trying to generate a VM memory dump:
  
- $ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:DE:AD:BE:FF:02,netdev=net0  -monitor stdio -serial vc  -loadvm SS0
+ $ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:AA:AD:BB:FF:02,netdev=net0  -monitor stdio -serial vc  -loadvm SS0
  QEMU 2.11.50 monitor - type 'help' for more information
  (qemu) pmemsave 0 0x3FFFFFFF memory.dmp
  Segmentation fault (core dumped)
  
  $ git rev-parse HEAD
  b384cd95eb9c6f73ad84ed1bb0717a26e29cc78f
  
  It's the second time I try to submit this bug, I think last time it
  failed because the attached core dump size (400M compressed). Have a
  look if you can get that file, otherwise I will try to update this
  ticket once it's created:
  
  (Error ID: OOPS-65553b72bc14be693eb1e37814ff9267)

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Title:
  qemu-system-arm segmentation fault trying to dump VM memory

Status in QEMU:
  New

Bug description:
  Qemu segfaults trying to generate a VM memory dump:

  $ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:AA:AD:BB:FF:02,netdev=net0  -monitor stdio -serial vc  -loadvm SS0
  QEMU 2.11.50 monitor - type 'help' for more information
  (qemu) pmemsave 0 0x3FFFFFFF memory.dmp
  Segmentation fault (core dumped)

  $ git rev-parse HEAD
  b384cd95eb9c6f73ad84ed1bb0717a26e29cc78f

  It's the second time I try to submit this bug, I think last time it
  failed because the attached core dump size (400M compressed). Have a
  look if you can get that file, otherwise I will try to update this
  ticket once it's created:

  (Error ID: OOPS-65553b72bc14be693eb1e37814ff9267)

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1751674/+subscriptions

[Qemu-devel] [Bug 1751674] Re: qemu-system-arm segmentation fault trying to dump VM memory

[Peter Maydell]

What's happening here is that the memory range you're asking to dump
(physaddrs 0 to 0x3fffffff) includes a lot of devices, including the
interrupt controller, which is at 0x1e000000. There's a longstanding bug
in the GIC code where it will crash if you try to access its per-CPU
register bank from some context that isn't a guest CPU (including the
monitor or the QEMU gdb stub), because it doesn't know which CPU's
version of the registers you wanted. That's what you've run into here.

However, I suspect you didn't really want to try to take a memory dump of a pile of devices. The RAM in the vexpress-a9 board starts at 0x60000000, so if you wanted the RAM then try
  pmemsave 0x60000000 0x9fffffff memory.dmp

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Title:
  qemu-system-arm segmentation fault trying to dump VM memory

Status in QEMU:
  New

Bug description:
  Qemu segfaults trying to generate a VM memory dump:

  $ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:AA:AD:BB:FF:02,netdev=net0  -monitor stdio -serial vc  -loadvm SS0
  QEMU 2.11.50 monitor - type 'help' for more information
  (qemu) pmemsave 0 0x3FFFFFFF memory.dmp
  Segmentation fault (core dumped)

  $ git rev-parse HEAD
  b384cd95eb9c6f73ad84ed1bb0717a26e29cc78f

  It's the second time I try to submit this bug, I think last time it
  failed because the attached core dump size (400M compressed). Have a
  look if you can get that file, otherwise I will try to update this
  ticket once it's created:

  (Error ID: OOPS-65553b72bc14be693eb1e37814ff9267)

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https://bugs.launchpad.net/qemu/+bug/1751674/+subscriptions

[Qemu-devel] [Bug 1751674] Re: qemu-system-arm segmentation fault trying to dump VM memory

[Peter Maydell]

LP:1602247 is the bug for the similar issue when using the gdb stub.

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Title:
  qemu-system-arm segmentation fault trying to dump VM memory

Status in QEMU:
  New

Bug description:
  Qemu segfaults trying to generate a VM memory dump:

  $ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:AA:AD:BB:FF:02,netdev=net0  -monitor stdio -serial vc  -loadvm SS0
  QEMU 2.11.50 monitor - type 'help' for more information
  (qemu) pmemsave 0 0x3FFFFFFF memory.dmp
  Segmentation fault (core dumped)

  $ git rev-parse HEAD
  b384cd95eb9c6f73ad84ed1bb0717a26e29cc78f

  It's the second time I try to submit this bug, I think last time it
  failed because the attached core dump size (400M compressed). Have a
  look if you can get that file, otherwise I will try to update this
  ticket once it's created:

  (Error ID: OOPS-65553b72bc14be693eb1e37814ff9267)

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1751674/+subscriptions

[Qemu-devel] [Bug 1751674] Re: qemu-system-arm segmentation fault trying to dump VM memory

[Peter Maydell]

** Changed in: qemu
       Status: New => Confirmed

** Summary changed:

- qemu-system-arm segmentation fault trying to dump VM memory
+ qemu-system-arm segmentation fault using pmemsave on the interrupt controller registers

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Title:
  qemu-system-arm segmentation fault using pmemsave on the interrupt
  controller registers

Status in QEMU:
  Confirmed

Bug description:
  Qemu segfaults trying to generate a VM memory dump:

  $ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:AA:AD:BB:FF:02,netdev=net0  -monitor stdio -serial vc  -loadvm SS0
  QEMU 2.11.50 monitor - type 'help' for more information
  (qemu) pmemsave 0 0x3FFFFFFF memory.dmp
  Segmentation fault (core dumped)

  $ git rev-parse HEAD
  b384cd95eb9c6f73ad84ed1bb0717a26e29cc78f

  It's the second time I try to submit this bug, I think last time it
  failed because the attached core dump size (400M compressed). Have a
  look if you can get that file, otherwise I will try to update this
  ticket once it's created:

  (Error ID: OOPS-65553b72bc14be693eb1e37814ff9267)

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1751674/+subscriptions

[Bug 1751674] Re: qemu-system-arm segmentation fault using pmemsave on the interrupt controller registers

[Thomas Huth]

The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.

If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".

If it is not fixed yet and you think that this bug report here is still
valid, then you have two options:

1) If you already have an account on gitlab.com, please open a new ticket
for this problem in our new tracker here:

    https://gitlab.com/qemu-project/qemu/-/issues

and then close this ticket here on Launchpad (or let it expire auto-
matically after 60 days). Please mention the URL of this bug ticket on
Launchpad in the new ticket on GitLab.

2) If you don't have an account on gitlab.com and don't intend to get
one, but still would like to keep this ticket opened, then please switch
the state back to "New" or "Confirmed" within the next 60 days (other-
wise it will get closed as "Expired"). We will then eventually migrate
the ticket automatically to the new system (but you won't be the reporter
of the bug in the new system and thus you won't get notified on changes
anymore).

Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: Confirmed => Incomplete

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Title:
  qemu-system-arm segmentation fault using pmemsave on the interrupt
  controller registers

Status in QEMU:
  Incomplete

Bug description:
  Qemu segfaults trying to generate a VM memory dump:

  $ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:AA:AD:BB:FF:02,netdev=net0  -monitor stdio -serial vc  -loadvm SS0
  QEMU 2.11.50 monitor - type 'help' for more information
  (qemu) pmemsave 0 0x3FFFFFFF memory.dmp
  Segmentation fault (core dumped)

  $ git rev-parse HEAD
  b384cd95eb9c6f73ad84ed1bb0717a26e29cc78f

  It's the second time I try to submit this bug, I think last time it
  failed because the attached core dump size (400M compressed). Have a
  look if you can get that file, otherwise I will try to update this
  ticket once it's created:

  (Error ID: OOPS-65553b72bc14be693eb1e37814ff9267)

To manage notifications about this bug go to:
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[Bug 1751674] Re: qemu-system-arm segmentation fault using pmemsave on the interrupt controller registers

[Peter Maydell]

Still valid.


** Changed in: qemu
       Status: Incomplete => Confirmed

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Title:
  qemu-system-arm segmentation fault using pmemsave on the interrupt
  controller registers

Status in QEMU:
  Confirmed

Bug description:
  Qemu segfaults trying to generate a VM memory dump:

  $ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:AA:AD:BB:FF:02,netdev=net0  -monitor stdio -serial vc  -loadvm SS0
  QEMU 2.11.50 monitor - type 'help' for more information
  (qemu) pmemsave 0 0x3FFFFFFF memory.dmp
  Segmentation fault (core dumped)

  $ git rev-parse HEAD
  b384cd95eb9c6f73ad84ed1bb0717a26e29cc78f

  It's the second time I try to submit this bug, I think last time it
  failed because the attached core dump size (400M compressed). Have a
  look if you can get that file, otherwise I will try to update this
  ticket once it's created:

  (Error ID: OOPS-65553b72bc14be693eb1e37814ff9267)

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1751674/+subscriptions

[Bug 1751674] Re: qemu-system-arm segmentation fault using pmemsave on the interrupt controller registers

[Thomas Huth]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/247


** Changed in: qemu
       Status: Confirmed => Expired

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #247
   https://gitlab.com/qemu-project/qemu/-/issues/247

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Title:
  qemu-system-arm segmentation fault using pmemsave on the interrupt
  controller registers

Status in QEMU:
  Expired

Bug description:
  Qemu segfaults trying to generate a VM memory dump:

  $ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:AA:AD:BB:FF:02,netdev=net0  -monitor stdio -serial vc  -loadvm SS0
  QEMU 2.11.50 monitor - type 'help' for more information
  (qemu) pmemsave 0 0x3FFFFFFF memory.dmp
  Segmentation fault (core dumped)

  $ git rev-parse HEAD
  b384cd95eb9c6f73ad84ed1bb0717a26e29cc78f

  It's the second time I try to submit this bug, I think last time it
  failed because the attached core dump size (400M compressed). Have a
  look if you can get that file, otherwise I will try to update this
  ticket once it's created:

  (Error ID: OOPS-65553b72bc14be693eb1e37814ff9267)

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1751674/+subscriptions