[Qemu-devel] [Bug 904617] [NEW] device_add usb-hub causes segfault in qemu-1.0

[Qemu-devel] [Bug 904617] [NEW] device_add usb-hub causes segfault in qemu-1.0

[Erik Rull]

Public bug reported:

When calling the command

(qemu) device_add usb-hub,bus=usb.0,port=4

qemu replies

Error: usb port 4 (bus usb.0) not found (in use?)

Then qemu crashes with a segfault:

[ 1546.177627] qemu-system-x86[1710]: segfault at 0 ip b75d3f8b sp
bfddb0b0 error 6 in qemu-system-x86_64[b7488000+2e2000]

Maybe it might be related to the docs/usb2.txt where UHCI has only 2
ports. But a mistake in the port number should not cause qemu to crash

** Affects: qemu
     Importance: Undecided
         Status: New

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Title:
  device_add usb-hub causes segfault in qemu-1.0

Status in QEMU:
  New

Bug description:
  When calling the command

  (qemu) device_add usb-hub,bus=usb.0,port=4

  qemu replies

  Error: usb port 4 (bus usb.0) not found (in use?)

  Then qemu crashes with a segfault:

  [ 1546.177627] qemu-system-x86[1710]: segfault at 0 ip b75d3f8b sp
  bfddb0b0 error 6 in qemu-system-x86_64[b7488000+2e2000]

  Maybe it might be related to the docs/usb2.txt where UHCI has only 2
  ports. But a mistake in the port number should not cause qemu to crash

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Re: [Qemu-devel] [Bug 904617] [NEW] device_add usb-hub causes segfault in qemu-1.0

[Stefan Hajnoczi]

On Thu, Dec 15, 2011 at 08:18:31AM -0000, Erik Rull wrote:
> Public bug reported:
> 
> When calling the command
> 
> (qemu) device_add usb-hub,bus=usb.0,port=4
> 
> qemu replies
> 
> Error: usb port 4 (bus usb.0) not found (in use?)
> 
> Then qemu crashes with a segfault:
> 
> [ 1546.177627] qemu-system-x86[1710]: segfault at 0 ip b75d3f8b sp
> bfddb0b0 error 6 in qemu-system-x86_64[b7488000+2e2000]
> 
> Maybe it might be related to the docs/usb2.txt where UHCI has only 2
> ports. But a mistake in the port number should not cause qemu to crash

Thanks for the bug report.  I confirmed this bug is present in
qemu.git/master and have submitted a patch to fix it.

Please consider sending backtraces when you encounter segfaults in the
future, they make it possible to identify the bug immediately in many
cases.  Here's how I reproduced this and got the backtrace:

$ gdb --args x86_64-softmmu/qemu-system-x86_64 -usb
(gdb) r
(qemu) device_add usb-hub,bus=usb.0,port=4
Program received signal SIGSEGV, Segmentation fault.
0x00005555556d786a in usb_unregister_port (bus=0x5555567f2ac0, port=0x555556956b40)
    at /home/stefanha/qemu/hw/usb-bus.c:231
231         QTAILQ_REMOVE(&bus->free, port, next);
(gdb) bt

[Qemu-devel] [Bug 904617] Re: device_add usb-hub causes segfault in qemu-1.0

[Thomas Huth]

Stefan's patch had been included here:
http://git.qemu.org/?p=qemu.git;a=commitdiff;h=db3a5ed7e4422491dac
==> Fix released

** Changed in: qemu
       Status: New => 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/904617

Title:
  device_add usb-hub causes segfault in qemu-1.0

Status in QEMU:
  Fix Released

Bug description:
  When calling the command

  (qemu) device_add usb-hub,bus=usb.0,port=4

  qemu replies

  Error: usb port 4 (bus usb.0) not found (in use?)

  Then qemu crashes with a segfault:

  [ 1546.177627] qemu-system-x86[1710]: segfault at 0 ip b75d3f8b sp
  bfddb0b0 error 6 in qemu-system-x86_64[b7488000+2e2000]

  Maybe it might be related to the docs/usb2.txt where UHCI has only 2
  ports. But a mistake in the port number should not cause qemu to crash

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