Why my BeagleBone Black goes to dead after reboot about 1~2 minutes every time?

Hi all,

The BeagleBone Black on my hands can work well two days before. But now it always goes to dead after reboot, can work for about 1~2 minutes and then goes to dead (kernel panic).
The dmesg is below, pelase check.
The image I flashed is Angstrom-Cloud9-IDE-GNOME-eglibc-ipk-v2012.12-beaglebone-2013.09.05.img.
I move all eMMC’s original boot files to a folder, so that I can bypass eMMC and use image on my 8G SD card. The above image is flashed to this SD card.
This way can work before.
But now when I start it, some message always comes out:
[ 10.504436] libphy: PHY 4a101000.mdio:01 not found
[ 10.509482] net eth0: phy 4a101000.mdio:01 not found on slave 1

I searched on Google. Some threads mentioned this issue, but it seems no conclusion.
It may be hardware issue, or pure software issue. Someone request RMA (repare it?).

I reflashed the image several times, but it seems no change: still dead.
Could anyone help to let me know the latest info about this kind of issue? Or is it clear to be a hardware or software issue?
Any possible solution?
Thanks!

Starting kernel …

Uncompressing Linux… done, booting the kernel.
[ 0.196321] omap2_mbox_probe: platform not supported
[ 0.206897] tps65217-bl tps65217-bl: no platform data provided
[ 0.283450] bone-capemgr bone_capemgr.8: slot #0: No cape found
[ 0.320558] bone-capemgr bone_capemgr.8: slot #1: No cape found
[ 0.357666] bone-capemgr bone_capemgr.8: slot #2: No cape found
[ 0.394775] bone-capemgr bone_capemgr.8: slot #3: No cape found
[ 0.414512] bone-capemgr bone_capemgr.8: slot #6: BB-BONELT-HDMIN conflict P8.45 (#5:BB-BONELT-HDMI)
[ 0.424121] bone-capemgr bone_capemgr.8: slot #6: Failed verification
[ 0.444553] omap_hsmmc mmc.4: of_parse_phandle_with_args of ‘reset’ failed
[ 0.451845] bone-capemgr bone_capemgr.8: loader: failed to load slot-6 BB-BONELT-HDMIN:00A0 (prio 2)
[ 0.518248] pinctrl-single 44e10800.pinmux: pin 44e10854 already requested by 44e10800.pinmux; cannot claim for gpio-leds.7
[ 0.529958] pinctrl-single 44e10800.pinmux: pin-21 (gpio-leds.7) status -22
[ 0.537271] pinctrl-single 44e10800.pinmux: could not request pin 21 on device pinctrl-single
systemd-fsck[86]: Angstrom: clean, 50531/218160 files, 348908/872448 blocks

.—O---.

.-. o o

-----.-----.-----.| | .----…-----.-----.
__ | —’| ‘–.| .-’| | |

— || --’| | | ’ | | | |
‘—’---’–’--’–. |-----’’----’’–’ ‘-----’-’-’-’
-’ |
‘—’

The Angstrom Distribution beaglebone ttyO0

Angstrom v2012.12 - Kernel 3.8.13

beaglebone login: [ 10.504436] libphy: PHY 4a101000.mdio:01 not found
[ 10.509482] net eth0: phy 4a101000.mdio:01 not found on slave 1
root
Last login: Sat Jan 1 00:13:16 UTC 2000 on ttyO0
root@beaglebone:~# cd /var/lib/connman/
root@beaglebone:/var/lib/connman# ls
ethernet_c8a030ad0ce3_cable wifi.config
lenovo-wifi.config wifi.config~
settings wifiDOTconfig
settings~ wifi_00e04c071119_4a756e6557696669_managed_psk

root@beaglebone:/var/lib/connman# cat settings
[global]
Timeservers=0.angstrom.pool.ntp.org;1.angstrom.pool.ntp.org;2.angstrom.pool.ntp.org;3.angstrom.pool.ntp.org
OfflineMode=false

[Wired]
Enable=true
Tethering=false

[WiFi]
Enable=true
Tethering=false
root@beaglebone:/var/lib/connman# [ 120.199458] INFO: task kworker/0:1:15 blocked for more than 60 seconds.
[ 120.206418] “echo 0 > /proc/sys/kernel/hung_task_timeout_secs” disables this message.
[ 120.214640] Kernel panic - not syncing: hung_task: blocked tasks
[ 120.220934] [] (unwind_backtrace+0x1/0x8c) from [] (panic+0x55/0x14c)
[ 120.229479] [] (panic+0x55/0x14c) from [] (watchdog+0x153/0x1a0)
[ 120.237570] [] (watchdog+0x153/0x1a0) from [] (kthread+0x61/0x72)
[ 120.245744] [] (kthread+0x61/0x72) from [] (ret_from_fork+0x11/0x34)
[ 120.254182] drm_kms_helper: panic occurred, switching back to text console
[ 123.395524] gadget: rndis req21.00 v0000 i0000 l12
[ 123.401208] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.513410] gadget: rndis req21.00 v0000 i0000 l36
[ 127.521207] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.526617] gadget: rndis req21.00 v0000 i0000 l36
[ 127.531726] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER
[ 127.541235] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.546744] gadget: rndis req21.00 v0000 i0000 l36
[ 127.553213] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.558657] gadget: rndis req21.00 v0000 i0000 l36
[ 127.565207] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.570614] gadget: rndis req21.00 v0000 i0000 l36
[ 127.575727] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER
[ 127.585208] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.590622] gadget: rndis req21.00 v0000 i0000 l36
[ 127.597208] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.602619] gadget: rndis req21.00 v0000 i0000 l36
[ 127.609288] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.614730] gadget: rndis req21.00 v0000 i0000 l36
[ 127.619834] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER
[ 127.629237] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.634748] gadget: rndis req21.00 v0000 i0000 l36
[ 127.641449] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.646889] gadget: rndis req21.00 v0000 i0000 l36
[ 127.653209] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.658629] gadget: rndis req21.00 v0000 i0000 l36
[ 127.663740] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER
[ 127.673207] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.678620] gadget: rndis req21.00 v0000 i0000 l36
[ 127.685210] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.690611] gadget: rndis req21.00 v0000 i0000 l36
[ 127.697209] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.702611] gadget: rndis req21.00 v0000 i0000 l36
[ 127.707726] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER
[ 127.717219] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.722599] gadget: rndis req21.00 v0000 i0000 l36
[ 127.729201] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.734622] gadget: rndis req21.00 v0000 i0000 l36
[ 127.741217] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.746614] gadget: rndis req21.00 v0000 i0000 l36
[ 127.751731] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER
[ 127.761220] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.766632] gadget: rndis req21.00 v0000 i0000 l36
[ 127.773220] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.778624] gadget: rndis req21.00 v0000 i0000 l36
[ 127.785286] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.790752] gadget: rndis req21.00 v0000 i0000 l36
[ 127.795863] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER
[ 127.805261] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.810752] gadget: rndis req21.00 v0000 i0000 l36
[ 127.817287] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.822826] gadget: rndis req21.00 v0000 i0000 l36
[ 127.829222] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.834635] gadget: rndis req21.00 v0000 i0000 l36
[ 127.839749] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER
[ 127.849222] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.854665] gadget: rndis req21.00 v0000 i0000 l36
[ 127.861247] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.867040] gadget: rndis req21.00 v0000 i0000 l36
[ 127.873251] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.878790] gadget: rndis req21.00 v0000 i0000 l36
[ 127.883895] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER
[ 127.893251] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.899291] gadget: rndis req21.00 v0000 i0000 l36
[ 127.905246] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.910763] gadget: rndis req21.00 v0000 i0000 l36
[ 127.917223] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.922667] gadget: rndis req21.00 v0000 i0000 l36
[ 127.927797] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER
[ 127.937294] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.942819] gadget: rndis req21.00 v0000 i0000 l36
[ 127.949214] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.954635] gadget: rndis req21.00 v0000 i0000 l36
[ 127.961225] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.966634] gadget: rndis req21.00 v0000 i0000 l36
[ 127.971744] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER
[ 127.981243] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 127.990590] gadget: rndis req21.00 v0000 i0000 l36
[ 127.997225] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 128.002636] gadget: rndis req21.00 v0000 i0000 l36
[ 128.009241] gadget: rndis reqa1.01 v0000 i0000 l4096
[ 128.014790] gadget: rndis req21.00 v0000 i0000 l36
[ 128.019899] gen_ndis_query_resp: RNDIS_OID_GEN_RCV_NO_BUFFER

If I type command
ifconfig

, then no any feedback from the shell. And I cannot terminal it, after a while, the BeagleBone Balck goes to dead…