crashes related to modemmanager

My laptop began frequently and seemingly randomly crashing to a black and white screen. The output looked very much like the following, which I could find in the system logs after rebooting:

Jul 15 09:34:20 kevin-laptop kernel: [ 777.670138] BUG: unable to handle kernel paging request at 00766650
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670183] IP: [<c133c37b>] __pm_runtime_resume+0x1b/0x60
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670220] *pde = ba66f067
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670239] Oops: 0002 [#1] SMP
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670263] last sysfs file: /sys/devices/pci0000:00/0000:00:1d.7/usb2/idVendor
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670302] Modules linked in: parport_pc ppdev joydev snd_hda_codec_conexant binfmt_misc arc4 iwlagn thinkpad_acpi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi iwlcore i915 pcmcia snd_seq_midi_event mac80211 snd_seq zaurus cdc_ether snd_timer usbnet cdc_acm cdc_wdm cfg80211 yenta_socket snd_seq_device pcmcia_rsrc pcmcia_core psmouse snd drm_kms_helper serio_raw drm snd_page_alloc soundcore nvram i2c_algo_bit tpm_tis tpm tpm_bios video lp parport usbhid hid firewire_ohci ahci firewire_core crc_itu_t e1000e libahci
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670670]
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670681] Pid: 1646, comm: modem-manager Not tainted 2.6.38-10-generic #46-Ubuntu LENOVO 7417CTO/7417CTO
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670743] EIP: 0060:[<c133c37b>] EFLAGS: 00010202 CPU: 0
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670773] EIP is at __pm_runtime_resume+0x1b/0x60
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670800] EAX: 00766580 EBX: 00766580 ECX: f853307c EDX: 00000004
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670833] ESI: 00766564 EDI: 00766580 EBP: ee95be6c ESP: ee95be5c
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670866] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Jul 15 09:34:20 kevin-laptop kernel: [ 777.670895] Process modem-manager (pid: 1646, ti=ee95a000 task=ed5ba5e0 task.ti=ee95a000)

As I had a fresh install, I tried simply reinstalling Ubuntu, but it didn't help. My second thought was that my harddrive might have gone bad, as a BIOS check on it returned with an error. After replacing the harddrive, the frequent crashes resumed within a couple of days. I then tried booting from a USB, but still encountered crashes.

Since I don't need the modemmanager package, I tried removing it with "sudo apt-get purge modemmanager". Since then, I haven't had a single crash.

At this point, my best guest is that this is a modemmanager bug. If someone can read through my reasoning and confirm, I'll file this as a bug report.