dmesg is reporting some crashes:

[ 5894.844302] ------------[ cut here ]------------
[ 5894.844323] WARNING: CPU: 3 PID: 694 at
/build/linux-Ol1uYP/linux-3.12.6/net/wireless/sme.c:795
wl_notify_roaming_status+0xba/0x130 [wl]()or
[ 5894.844325] Modules linked in: nls_utf8 nls_cp437 vfat fat
usb_storage michael_mic arc4 ecb ppdev lp rfcomm bnep binfmt_misc
uinput nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc
loop snd_hda_codec_hdmi x86_pkg_temp_thermal btusb bluetooth
snd_hda_codec_idt joydev intel_powerclamp coretemp radeon kvm_intel
ttm drm_kms_helper drm i2c_algo_bit kvm i2c_i801 snd_hda_intel
i2c_core iTCO_wdt iTCO_vendor_support crc32_pclmul snd_hda_codec
lib80211_crypt_tkip crc32c_intel snd_hwdep snd_pcm dell_wmi
sparse_keymap wl(PO) lpc_ich mfd_core ghash_clmulni_intel aesni_intel
snd_page_alloc aes_x86_64 ablk_helper cfg80211 cryptd lrw snd_seq
snd_seq_device gf128mul snd_timer glue_helper psmouse snd dell_laptop
wmi mei_me mei parport_pc parport lib80211 soundcore rfkill dcdbas
evdev pcspkr processor serio_raw battery button ac video ext4 crc16
mbcache jbd2 sg sd_mod sr_mod crc_t10dif cdrom crct10dif_common
hid_generic usbhid hid sdhci_pci sdhci ahci libahci ehci_pci xhci_hcd
mmc_core ehci_hcd firewire_ohci libata scsi_mod firewire_core
crc_itu_t e1000e ptp pps_core usbcore usb_common thermal thermal_sys
[ 5894.844375] CPU: 3 PID: 694 Comm: wl_event_handle Tainted: P
W  O 3.12-0.bpo.1-amd64 #1 Debian 3.12.6-2~bpo70+1
[ 5894.844376] Hardware name: Dell Inc. Precision M6700/096J9P, BIOS
A08 12/13/2012
[ 5894.844377]  0000000000000000 ffffffffa03bb730 ffffffff814bed34
0000000000000000
[ 5894.844380]  ffffffff81060347 ffff88022320c600 ffff880221b11000
ffff88022320ce1a
[ 5894.844382]  ffff8800cd676ad4 ffff88022320c9f8 ffffffffa0580efa
00000000000000a9
[ 5894.844384] Call Trace:
[ 5894.844391]  [<ffffffff814bed34>] ? dump_stack+0x41/0x51
[ 5894.844395]  [<ffffffff81060347>] ? warn_slowpath_common+0x87/0xc0
[ 5894.844404]  [<ffffffffa0580efa>] ? wl_notify_roaming_status+0xba/0x130 [wl]
[ 5894.844412]  [<ffffffffa057d935>] ? wl_event_handler+0x45/0x1d0 [wl]
[ 5894.844420]  [<ffffffffa057d8f0>] ? wl_deinit_priv_mem+0x90/0x90 [wl]
[ 5894.844422]  [<ffffffff810822d3>] ? kthread+0xb3/0xc0
[ 5894.844424]  [<ffffffff81082220>] ? flush_kthread_worker+0xa0/0xa0
[ 5894.844427]  [<ffffffff814cc40c>] ? ret_from_fork+0x7c/0xb0
[ 5894.844428]  [<ffffffff81082220>] ? flush_kthread_worker+0xa0/0xa0
[ 5894.844430] ---[ end trace 2b091d9ba2a3a05d ]---
[ 5901.541688] cfg80211: Calling CRDA to update world regulatory domain
[ 5901.545275] cfg80211: World regulatory domain updated:
[ 5901.545278] cfg80211:   (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp)
[ 5901.545280] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz),
(300 mBi, 2000 mBm)
[ 5901.545282] cfg80211:   (2457000 KHz - 2482000 KHz @ 20000 KHz),
(300 mBi, 2000 mBm)
[ 5901.545283] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz),
(300 mBi, 2000 mBm)
[ 5901.545285] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz),
(300 mBi, 2000 mBm)
[ 5901.545286] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz),
(300 mBi, 2000 mBm)
[ 5907.059437] ------------[ cut here ]------------

or

[ 5915.829547] ------------[ cut here ]------------
[ 5915.829576] WARNING: CPU: 0 PID: 694 at
/build/linux-Ol1uYP/linux-3.12.6/net/wireless/sme.c:795
wl_notify_roaming_status+0xba/0x130 [wl]()
[ 5915.829578] Modules linked in: nls_utf8 nls_cp437 vfat fat
usb_storage michael_mic arc4 ecb ppdev lp rfcomm bnep binfmt_misc
uinput nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc
loop snd_hda_codec_hdmi x86_pkg_temp_thermal btusb bluetooth
snd_hda_codec_idt joydev intel_powerclamp coretemp radeon kvm_intel
ttm drm_kms_helper drm i2c_algo_bit kvm i2c_i801 snd_hda_intel
i2c_core iTCO_wdt iTCO_vendor_support crc32_pclmul snd_hda_codec
lib80211_crypt_tkip crc32c_intel snd_hwdep snd_pcm dell_wmi
sparse_keymap wl(PO) lpc_ich mfd_core ghash_clmulni_intel aesni_intel
snd_page_alloc aes_x86_64 ablk_helper cfg80211 cryptd lrw snd_seq
snd_seq_device gf128mul snd_timer glue_helper psmouse snd dell_laptop
wmi mei_me mei parport_pc parport lib80211 soundcore rfkill dcdbas
evdev pcspkr processor serio_raw battery button ac video ext4 crc16
mbcache jbd2 sg sd_mod sr_mod crc_t10dif cdrom crct10dif_common
hid_generic usbhid hid sdhci_pci sdhci ahci libahci ehci_pci xhci_hcd
mmc_core ehci_hcd firewire_ohci libata scsi_mod firewire_core
crc_itu_t e1000e ptp pps_core usbcore usb_common thermal thermal_sys
[ 5915.829646] CPU: 0 PID: 694 Comm: wl_event_handle Tainted: P
W  O 3.12-0.bpo.1-amd64 #1 Debian 3.12.6-2~bpo70+1
[ 5915.829648] Hardware name: Dell Inc. Precision M6700/096J9P, BIOS
A08 12/13/2012
[ 5915.829650]  0000000000000000 ffffffffa03bb730 ffffffff814bed34
0000000000000000
[ 5915.829653]  ffffffff81060347 ffff88022320c600 ffff880221b11000
ffff88022320ce1a
[ 5915.829656]  ffff8802209f2854 ffff88022320c9f8 ffffffffa0580efa
00000000000000a9
[ 5915.829659] Call Trace:
[ 5915.829668]  [<ffffffff814bed34>] ? dump_stack+0x41/0x51
[ 5915.829674]  [<ffffffff81060347>] ? warn_slowpath_common+0x87/0xc0
[ 5915.829686]  [<ffffffffa0580efa>] ? wl_notify_roaming_status+0xba/0x130 [wl]
[ 5915.829697]  [<ffffffffa057d935>] ? wl_event_handler+0x45/0x1d0 [wl]
[ 5915.829708]  [<ffffffffa057d8f0>] ? wl_deinit_priv_mem+0x90/0x90 [wl]
[ 5915.829712]  [<ffffffff810822d3>] ? kthread+0xb3/0xc0
[ 5915.829714]  [<ffffffff81082220>] ? flush_kthread_worker+0xa0/0xa0
[ 5915.829718]  [<ffffffff814cc40c>] ? ret_from_fork+0x7c/0xb0
[ 5915.829721]  [<ffffffff81082220>] ? flush_kthread_worker+0xa0/0xa0
[ 5915.829723] ---[ end trace 2b091d9ba2a3a060 ]---

Keeps coming back:

[10119.710614] ------------[ cut here ]------------
[10119.710658] WARNING: CPU: 1 PID: 689 at
/build/linux-Ol1uYP/linux-3.12.6/net/wireless/sme.c:795
wl_bss_connect_done.isra.22+0x115/0x1c0 [wl]()
[10119.710660] Modules linked in: michael_mic arc4 ecb ppdev lp rfcomm
bnep binfmt_misc uinput nfsd auth_rpcgss oid_registry nfs_acl nfs
lockd fscache sunrpc loop btusb bluetooth x86_pkg_temp_thermal
intel_powerclamp snd_hda_codec_hdmi coretemp kvm_intel kvm fglrx(PO)
snd_hda_codec_idt snd_hda_intel crc32_pclmul snd_hda_codec
crc32c_intel dell_wmi sparse_keymap joydev ghash_clmulni_intel
lib80211_crypt_tkip wl(PO) snd_hwdep snd_pcm i2c_i801 snd_page_alloc
aesni_intel snd_seq aes_x86_64 ablk_helper snd_seq_device iTCO_wdt
iTCO_vendor_support snd_timer cryptd lrw snd i2c_core gf128mul
soundcore lpc_ich mei_me mfd_core parport_pc parport cfg80211
dell_laptop wmi evdev dcdbas mei glue_helper lib80211 psmouse rfkill
pcspkr ac video processor serio_raw battery button ext4 crc16 mbcache
jbd2 sg sd_mod sr_mod crc_t10dif cdrom crct10dif_common hid_generic
usbhid hid sdhci_pci ahci sdhci firewire_ohci libahci mmc_core
firewire_core crc_itu_t libata scsi_mod thermal thermal_sys xhci_hcd
e1000e ptp pps_core ehci_pci ehci_hcd usbcore usb_common
[10119.710730] CPU: 1 PID: 689 Comm: wl_event_handle Tainted: P
W  O 3.12-0.bpo.1-amd64 #1 Debian 3.12.6-2~bpo70+1
[10119.710732] Hardware name: Dell Inc. Precision M6700/096J9P, BIOS
A08 12/13/2012
[10119.710734]  0000000000000000 ffffffffa0373730 ffffffff814bed34
0000000000000000
[10119.710738]  ffffffff81060347 ffff880222779600 ffff880222779e1a
ffff880221cf8000
[10119.710742]  0000000000000001 ffff880220dff554 ffffffffa05a1085
00000000000000a9
[10119.710745] Call Trace:
[10119.710757]  [<ffffffff814bed34>] ? dump_stack+0x41/0x51
[10119.710766]  [<ffffffff81060347>] ? warn_slowpath_common+0x87/0xc0
[10119.710791]  [<ffffffffa05a1085>] ?
wl_bss_connect_done.isra.22+0x115/0x1c0 [wl]
[10119.710810]  [<ffffffffa05a12b0>] ? wl_notify_connect_status+0x180/0x350 [wl]
[10119.710816]  [<ffffffff81087620>] ? down_interruptible+0x30/0x60
[10119.710831]  [<ffffffffa059d935>] ? wl_event_handler+0x45/0x1d0 [wl]
[10119.710840]  [<ffffffffa059d8f0>] ? wl_deinit_priv_mem+0x90/0x90 [wl]
[10119.710843]  [<ffffffff810822d3>] ? kthread+0xb3/0xc0
[10119.710846]  [<ffffffff81082220>] ? flush_kthread_worker+0xa0/0xa0
[10119.710849]  [<ffffffff814cc40c>] ? ret_from_fork+0x7c/0xb0
[10119.710852]  [<ffffffff81082220>] ? flush_kthread_worker+0xa0/0xa0
[10119.710854] ---[ end trace b6cc4f4493db6460 ]---

Hello, dear Maintainer.

Recently I have upgraded my very old system shipped with Debian Jessie.

I have upgraded a pile of packages. Among others there were:
--------------------
linux-headers-amd64                        3.16+61 => 3.16+63
linux-image-amd64                          3.16+61 => 3.16+63
linux-libc-dev                            3.16.3-2 => 3.16.7-2
linux-libc-dev:i386                       3.16.3-2 => 3.16.7-2
broadcom-sta-dkms                   6.30.223.248-1 => 6.30.223.248-2
--------------------

After a while I found that my wifi card cannot connect to my router.

I started looking for roots of the problem, and realized that the
problem is sprcifically with *wl* driver. I attach syslog cut for your
consideration.

PS: Now I have to send this email via another computer because my own
laptop is not able to connect the Internet.
I also wanna note that I've already tried to rebuild/reinstall different
wl modules from different packages broadcom-sta-dkms with different
kernels (3.16.0-4, 3.16-2, 3.2.0-x). I cannot find a pair
(kernel-module) that works fine. I cannot understand what goes wrong and
specifically need somebody's help.

Dear Customer,

This is to confirm that your item has been shipped at January 27.

Please check delivery label attached!

Kind thanks,
Harvey Hines,
USPS Senior Delivery Manager.