[Qemu-devel] [Bug 932539] Re: qemu exits with -11 when connecting to a port redirect before the service starts listening

[Qemu-devel] [Bug 932539] Re: qemu exits with -11 when connecting to a port redirect before the service starts listening

[Serge Hallyn]

inline void
insque(void *a, void *b)
{
        register struct quehead *element = (struct quehead *) a;
        register struct quehead *head = (struct quehead *) b;
        element->qh_link = head->qh_link;

(line 27 is the last line)

(gdb) p *element
Cannot access memory at address 0x0
(gdb) p a
$3 = (void *) 0x0

This is called from here in slirp/if.c:

        /* If there are more packets for this session, re-queue them */
        if (ifm->ifs_next != /* ifm->ifs_prev != */ ifm) {
                insque(ifm->ifs_next, ifqt);
                ifs_remque(ifm);
        }

It sounds like ifm expects its last element to have ifm->ifs_next = ifm,
but it's actually == NULL.

I don't see any changes to this file likely to have introduced the
regression, looking further up the stack.


** Also affects: qemu
   Importance: Undecided
       Status: New

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Title:
  qemu exits with -11 when connecting to a port redirect before the
  service starts listening

Status in QEMU:
  New
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  This was detected initially as a crash in the auto upgrade tester.
  The code of the upgrade tester basically spawns a kvm instance in the background with a port redirect from localhost:54322 to tcp:22 in the VM, then wait for that port to allow for a ssh connection before continuing the upgrade testing.

  In the past (Oneiric), all worked well but since Precise, we now get
  qemu exitting with -11 at every single test :(

  A quick reproducer is:
   - start a VM that has openssh-server installed with: -net user,hostfwd=tcp::54322-:22
   - immediately start "ssh -p 54322 127.0.0.1" before the VM starts booting (BIOS/GRUB state)

  Then wait for sshd to start in the VM and qemu will exit with -11.

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[Qemu-devel] [Bug 932539] Re: qemu exits with -11 when connecting to a port redirect before the service starts listening

[Serge Hallyn]

Reproduced with uptodate qemu.git:

./x86_64-softmmu/qemu-system-x86_64 --enable-kvm -drive file=../../delme.img -m 512 -vnc :1 -net nic,model=virtio -net user,hostfwd=tcp::2222-:22
[...  immediately ssh -p 2222 localhost in another terminal, then wait while VM starts to boot ...]
Segmentation fault (core dumped)

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https://bugs.launchpad.net/bugs/932539

Title:
  qemu exits with -11 when connecting to a port redirect before the
  service starts listening

Status in QEMU:
  New
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  This was detected initially as a crash in the auto upgrade tester.
  The code of the upgrade tester basically spawns a kvm instance in the background with a port redirect from localhost:54322 to tcp:22 in the VM, then wait for that port to allow for a ssh connection before continuing the upgrade testing.

  In the past (Oneiric), all worked well but since Precise, we now get
  qemu exitting with -11 at every single test :(

  A quick reproducer is:
   - start a VM that has openssh-server installed with: -net user,hostfwd=tcp::54322-:22
   - immediately start "ssh -p 54322 127.0.0.1" before the VM starts booting (BIOS/GRUB state)

  Then wait for sshd to start in the VM and qemu will exit with -11.

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[Qemu-devel] [Bug 932539] Re: qemu exits with -11 when connecting to a port redirect before the service starts listening

[Serge Hallyn]

I was thinking 1ab74cea060d776b19857c3babc64d729bbdba5c might have
introduced it, but at that commit it doesn't happen.

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https://bugs.launchpad.net/bugs/932539

Title:
  qemu exits with -11 when connecting to a port redirect before the
  service starts listening

Status in QEMU:
  New
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  This was detected initially as a crash in the auto upgrade tester.
  The code of the upgrade tester basically spawns a kvm instance in the background with a port redirect from localhost:54322 to tcp:22 in the VM, then wait for that port to allow for a ssh connection before continuing the upgrade testing.

  In the past (Oneiric), all worked well but since Precise, we now get
  qemu exitting with -11 at every single test :(

  A quick reproducer is:
   - start a VM that has openssh-server installed with: -net user,hostfwd=tcp::54322-:22
   - immediately start "ssh -p 54322 127.0.0.1" before the VM starts booting (BIOS/GRUB state)

  Then wait for sshd to start in the VM and qemu will exit with -11.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/932539/+subscriptions

[Qemu-devel] [Bug 932539] Re: qemu exits with -11 when connecting to a port redirect before the service starts listening

[Serge Hallyn]

Oddly, a bisect suggests this was introduced by

commit e3a110b527f749a2acec079c261f4481aadd3edc:
    slirp: Only start packet expiration for delayed ones

which seems rather innocent.

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/932539

Title:
  qemu exits with -11 when connecting to a port redirect before the
  service starts listening

Status in QEMU:
  New
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  This was detected initially as a crash in the auto upgrade tester.
  The code of the upgrade tester basically spawns a kvm instance in the background with a port redirect from localhost:54322 to tcp:22 in the VM, then wait for that port to allow for a ssh connection before continuing the upgrade testing.

  In the past (Oneiric), all worked well but since Precise, we now get
  qemu exitting with -11 at every single test :(

  A quick reproducer is:
   - start a VM that has openssh-server installed with: -net user,hostfwd=tcp::54322-:22
   - immediately start "ssh -p 54322 127.0.0.1" before the VM starts booting (BIOS/GRUB state)

  Then wait for sshd to start in the VM and qemu will exit with -11.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/932539/+subscriptions

[Qemu-devel] [Bug 932539] Re: qemu exits with -11 when connecting to a port redirect before the service starts listening

[Serge Hallyn]

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

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/932539

Title:
  qemu exits with -11 when connecting to a port redirect before the
  service starts listening

Status in QEMU:
  Confirmed
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  This was detected initially as a crash in the auto upgrade tester.
  The code of the upgrade tester basically spawns a kvm instance in the background with a port redirect from localhost:54322 to tcp:22 in the VM, then wait for that port to allow for a ssh connection before continuing the upgrade testing.

  In the past (Oneiric), all worked well but since Precise, we now get
  qemu exitting with -11 at every single test :(

  A quick reproducer is:
   - start a VM that has openssh-server installed with: -net user,hostfwd=tcp::54322-:22
   - immediately start "ssh -p 54322 127.0.0.1" before the VM starts booting (BIOS/GRUB state)

  Then wait for sshd to start in the VM and qemu will exit with -11.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/932539/+subscriptions

[Qemu-devel] [Bug 932539] Re: qemu exits with -11 when connecting to a port redirect before the service starts listening

[Serge Hallyn]

This appears to be fixed upstream.

** Changed in: qemu
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/932539

Title:
  qemu exits with -11 when connecting to a port redirect before the
  service starts listening

Status in QEMU:
  Fix Released
Status in “qemu-kvm” package in Ubuntu:
  Fix Released

Bug description:
  This was detected initially as a crash in the auto upgrade tester.
  The code of the upgrade tester basically spawns a kvm instance in the background with a port redirect from localhost:54322 to tcp:22 in the VM, then wait for that port to allow for a ssh connection before continuing the upgrade testing.

  In the past (Oneiric), all worked well but since Precise, we now get
  qemu exitting with -11 at every single test :(

  A quick reproducer is:
   - start a VM that has openssh-server installed with: -net user,hostfwd=tcp::54322-:22
   - immediately start "ssh -p 54322 127.0.0.1" before the VM starts booting (BIOS/GRUB state)

  Then wait for sshd to start in the VM and qemu will exit with -11.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/932539/+subscriptions

[Qemu-devel] [Bug 932539] Re: qemu exits with -11 when connecting to a port redirect before the service starts listening

[Serge Hallyn]

(cherrypicked the slirp/if.c patches from upstream, which fixed the
problem for me.  Pushing the resulting package)

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/932539

Title:
  qemu exits with -11 when connecting to a port redirect before the
  service starts listening

Status in QEMU:
  Fix Released
Status in “qemu-kvm” package in Ubuntu:
  Fix Released

Bug description:
  This was detected initially as a crash in the auto upgrade tester.
  The code of the upgrade tester basically spawns a kvm instance in the background with a port redirect from localhost:54322 to tcp:22 in the VM, then wait for that port to allow for a ssh connection before continuing the upgrade testing.

  In the past (Oneiric), all worked well but since Precise, we now get
  qemu exitting with -11 at every single test :(

  A quick reproducer is:
   - start a VM that has openssh-server installed with: -net user,hostfwd=tcp::54322-:22
   - immediately start "ssh -p 54322 127.0.0.1" before the VM starts booting (BIOS/GRUB state)

  Then wait for sshd to start in the VM and qemu will exit with -11.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/932539/+subscriptions

[Qemu-devel] [Bug 932539] Re: qemu exits with -11 when connecting to a port redirect before the service starts listening

[Launchpad Bug Tracker]

This bug was fixed in the package qemu-kvm - 1.0+noroms-0ubuntu8

---------------
qemu-kvm (1.0+noroms-0ubuntu8) precise; urgency=low

  * debian/patches/slirp-*: fix bad exit with -11 when connecting to a port
    redirect before the service starts listening.  (LP: #932539)
 -- Serge Hallyn <serge.hallyn@ubuntu.com>   Fri, 16 Mar 2012 16:34:05 -0500

** Changed in: qemu-kvm (Ubuntu)
       Status: Confirmed => Fix Released

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/932539

Title:
  qemu exits with -11 when connecting to a port redirect before the
  service starts listening

Status in QEMU:
  Fix Released
Status in “qemu-kvm” package in Ubuntu:
  Fix Released

Bug description:
  This was detected initially as a crash in the auto upgrade tester.
  The code of the upgrade tester basically spawns a kvm instance in the background with a port redirect from localhost:54322 to tcp:22 in the VM, then wait for that port to allow for a ssh connection before continuing the upgrade testing.

  In the past (Oneiric), all worked well but since Precise, we now get
  qemu exitting with -11 at every single test :(

  A quick reproducer is:
   - start a VM that has openssh-server installed with: -net user,hostfwd=tcp::54322-:22
   - immediately start "ssh -p 54322 127.0.0.1" before the VM starts booting (BIOS/GRUB state)

  Then wait for sshd to start in the VM and qemu will exit with -11.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/932539/+subscriptions