And a better snippet... every time the nmcli command is run to bring up the adhoc connection, the same kernel stack-trace as show in the description is  produced:

Jul 10 21:43:07 ubuntu-phablet wpa_supplicant[1706]: wlan0: Trying to associate with SSID 'hotspot'
Jul 10 21:43:07 ubuntu-phablet NetworkManager[3465]: <info> (wlan0): supplicant interface state: disconnected -> associating
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.291683] wlan: [1356:E :PE ] limMlmAddBss: 1672: TRYING TO HIDE SSID 0
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.291866] wlan: [1356:E :PE ] mlm_add_sta: 1573: GF: 0, ChnlWidth: 0, MimoPS: 0, lsigTXOP: 0, dsssCCK: 0, SGI20: 0, SGI400
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306515] wlan: [1356:F :PE ] limProcessIbssMlmAddBssRsp: 2524: could not activate Heartbeat timer
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306699] VOS ASSERT in logDebug Line 219
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306790] ------------[ cut here ]------------
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306821] WARNING: at /build/buildd/linux-mako-3.4.0/drivers/staging/prima/CORE/SYS/legacy/src/utils/src/logApi.c:219 logDebug+0xc0/0xf4()
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306821] Modules linked in:
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306851] [<c0014f88>] (unwind_backtrace+0x0/0xe8) from [<c08c5b04>] (dump_stack+0x20/0x24)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306851] [<c08c5b04>] (dump_stack+0x20/0x24) from [<c00754a4>] (warn_slowpath_common+0x5c/0x74)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306882] [<c00754a4>] (warn_slowpath_common+0x5c/0x74) from [<c0075578>] (warn_slowpath_null+0x2c/0x34)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306912] [<c0075578>] (warn_slowpath_null+0x2c/0x34) from [<c06a5c34>] (logDebug+0xc0/0xf4)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306912] [<c06a5c34>] (logDebug+0xc0/0xf4) from [<c05eb82c>] (limLog+0x48/0x50)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306943] [<c05eb82c>] (limLog+0x48/0x50) from [<c0608e48>] (limProcessMlmAddBssRsp+0x168/0xd40)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306973] [<c0608e48>] (limProcessMlmAddBssRsp+0x168/0xd40) from [<c0600170>] (limProcessMessages+0xe74/0x10ac)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.306973] [<c0600170>] (limProcessMessages+0xe74/0x10ac) from [<c06006c0>] (limMessageProcessor+0x274/0x2bc)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.307004] [<c06006c0>] (limMessageProcessor+0x274/0x2bc) from [<c05e6308>] (peProcessMessages+0x54/0x5c)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.307004] [<c05e6308>] (peProcessMessages+0x54/0x5c) from [<c06c56a0>] (VosMCThread+0x44c/0x68c)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.307034] [<c06c56a0>] (VosMCThread+0x44c/0x68c) from [<c0095400>] (kthread+0x9c/0xa8)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.307065] [<c0095400>] (kthread+0x9c/0xa8) from [<c000edb4>] (kernel_thread_exit+0x0/0x8)
Jul 10 21:43:07 ubuntu-phablet kernel: [  943.307065] ---[ end trace 344cbbc63d880e12 ]---
Jul 10 21:43:15 ubuntu-phablet kernel: [  951.645475] healthd: battery l=100 v=4317 t=30.9 h=2 st=5 c=-1 chg=u
Jul 10 21:43:25 ubuntu-phablet kernel: [  961.645475] healthd: battery l=100 v=4318 t=30.9 h=2 st=5 c=0 chg=u
Jul 10 21:43:25 ubuntu-phablet kernel: [  961.714023] healthd: battery l=100 v=4318 t=30.9 h=2 st=5 c=0 chg=u
Jul 10 21:43:32 ubuntu-phablet NetworkManager[3465]: <warn> Activation (wlan0/wireless): Ad-Hoc network creation took too long, failing activation.