Seems the video driver calling timeout in the wrong context is the root cause:
>[ 45.638269] Call Trace:
<4>[ 45.638273] [e69a38a0] [c00080bc] show_stack+0xfc/0x1c0 (unreliable)
<4>[ 45.638277] [e69a38f0] [c07fd050] dump_stack+0x78/0xa0
<4>[ 45.638285] [e69a3900] [c008eb50] dequeue_task_idle+0x40/0x60
<4>[ 45.638288] [e69a3910] [c07ebc7c] __schedule+0x4dc/0x780
<4>[ 45.638292] [e69a3a20] [c07eaf64] schedule_timeout+0x144/0x260
<4>[ 45.638295] [e69a3a80] [c07ee368] __down_timeout+0x78/0xc0
<4>[ 45.638299] [e69a3ab0] [c00a1834] down_timeout+0x74/0x80
<4>[ 45.638303] [e69a3ad0] [c0439f0c] dlfb_get_urb+0x2c/0xc0
<4>[ 45.638306] [e69a3af0] [c043b5e4] dlfb_handle_damage.isra.3+0xa4/0x1f0
<4>[ 45.638309] [e69a3b30] [c0419934] soft_cursor+0x1b4/0x2a0
<4>[ 45.638313] [e69a3b60] [c041935c] bit_cursor+0x52c/0x550
<4>[ 45.638316] [e69a3bf0] [c0415400] fbcon_cursor+0x130/0x1b0
<4>[ 45.638319] [e69a3c20] [c046f098] vt_console_print+0x248/0x4a0
<4>[ 45.638322] [e69a3c70] [c00a6ab0]
call_console_drivers.constprop.18+0xf0/0x170
<4>[ 45.638325] [e69a3c90] [c00a73a4] console_unlock+0x474/0x4a0
<4>[ 45.638329] [e69a3cc0] [c00a76c4] vprintk_emit+0x2f4/0x500
<4>[ 45.638332] [e69a3d10] [c0499018] dev_vprintk_emit+0x58/0x70
<4>[ 45.638336] [e69a3db0] [c0499084] dev_printk_emit+0x54/0x70
<4>[ 45.638339] [e69a3de0] [c06db0a4] netdev_info+0x74/0x90
<4>[ 45.638346] [e69a3e20] [f1c6ead8] tg3_link_report+0xb8/0x170 [tg3]
<4>[ 45.638351] [e69a3e30] [f1c6f888] tg3_test_and_report_link_chg+0x58/0xa0
[tg3]
<4>[ 45.638358] [e69a3e40] [f1c79ef4] tg3_setup_phy+0xf74/0x2450 [tg3]
<4>[ 45.638364] [e69a3ee0] [f1c7f6b8] tg3_poll+0x398/0x430 [tg3]
<4>[ 45.638367] [e69a3f30] [c06d9954] net_rx_action+0x144/0x250
<4>[ 45.638370] [e69a3f80] [c0055758] __do_softirq+0x118/0x2b0
<4>[ 45.638374] [e69a3fe0] [c0055d04] irq_exit+0xb4/0xf0
<4>[ 45.638377] [e69a3ff0] [c000e8d0] call_do_irq+0x24/0x3c
<4>[ 45.638380] [c0b75e90] [c00054c8] do_IRQ+0x98/0x110
<4>[ 45.638383] [c0b75eb0] [c0010bfc] ret_from_except+0x0/0x18
<4>[ 45.638388] --- Exception: 501 at arch_cpu_idle+0x30/0x80
<4>[ 45.638388] LR = arch_cpu_idle+0x30/0x80
<4>[ 45.638392] [c0b75f70] [c00b5bd8] rcu_idle_enter+0xb8/0x100 (unreliable)
<4>[ 45.638395] [c0b75f80] [c00a93a0] cpu_startup_entry+0x160/0x260
<4>[ 45.638398] [c0b75fc0] [c0a887ec] start_kernel+0x33c/0x350
<4>[ 45.638401] [c0b75ff0] [c00003fc] skpinv+0x2e8/0x324
<1>[ 45.638412] Unable to handle kernel paging request for instruction fetch
<1>[ 45.638413] Faulting instruction address: 0x00000000
[dumpcommon]kdb> -bt
Stack traceback for pid 74
0xe62b8000 74 2 1 1 R 0xe62b8340 *kworker/1:1
Call Trace:
[e63978e0] [c00080bc] show_stack+0xfc/0x1c0 (unreliable)
[e6397930] [c00fcb28] kdb_show_stack+0x88/0xb0
[e6397950] [c00fcc04] kdb_bt1.isra.0+0xb4/0x140
[e6397980] [c00fd010] kdb_bt+0x380/0x450
[e6397a10] [c00f9c50] kdb_parse+0x270/0x720
[e6397a60] [c00fa1d4] kdb_exec_defcmd+0xd4/0x140
[e6397a80] [c00f9c50] kdb_parse+0x270/0x720
[e6397ad0] [c00fa7b8] kdb_main_loop+0x348/0x7c0
[e6397b30] [c00fdee8] kdb_stub+0x248/0x4c0
[e6397b70] [c00f2a10] kgdb_cpu_enter+0x3c0/0x6a0
[e6397bd0] [c00f30a0] kgdb_handle_exception+0x1c0/0x220
[e6397c20] [c0011a04] kgdb_debugger+0x94/0xb0
[e6397c30] [c000bd3c] die+0x2ec/0x310
[e6397c60] [c0010a68] handle_page_fault+0x7c/0x80
--- Exception: 400 at (null)
LR = ttwu_activate+0x28/0x70
[e6397d30] [c0088e70] ttwu_do_activate+0x50/0x70
[e6397d50] [c0088ff4] sched_ttwu_pending+0x84/0xb0
[e6397d70] [c0089f10] scheduler_ipi+0x60/0x190
[e6397d90] [c00126d0] smp_ipi_demux+0xa0/0xf0
[e6397db0] [c0010250] doorbell_exception+0x70/0xa0
[e6397dd0] [c0010bb0] ret_from_except_full+0x0/0x4c
--- Exception: 2070 at linkwatch_event+0x0/0x50
LR = process_one_work+0x14c/0x3e0
[e6397e90] [c006fef8] process_one_work+0x128/0x3e0 (unreliable)
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https://bugs.launchpad.net/bugs/1279403
Title:
tg3 driver hangs in iscsi booted initrd : (trusty)
Status in “linux-ppc” package in Ubuntu:
New
Bug description:
Testing saucy iscsi target booted on e500mc default initrd hangs
when tg3 driver started.
saucy was installed to an iSCSI target using the interactive setup from:
http://ports.ubuntu.com/dists/saucy/main/installer-powerpc/current/images/e500mc/netboot/vmlinux
http://ports.ubuntu.com/dists/saucy/main/installer-powerpc/current/images/e500mc/netboot/initrd.gz
Linux version 3.11.0-5-powerpc-e500mc
initrd.img-3.11.0-5-powerpc-e500mc
Booted from flash USB to simulate a pxe boot.
svy-boot#
svy-boot# mount /dev/sda1 /mnt
svy-boot# cd /mnt/iscsi2
svy-boot# ./go.sh
/sbin/kexec --command='root=/dev/ram ro
UUID=1cfe9f29-e188-4e00-ac47-3bf2245b117f ro break debug interface=eth4
console=tty0 console=ttyS0,115200 dhcp
ISCSI_INITIATOR=iqn.1993-08.org.debian:01:53694d75a62e
ISCSI_TARGET_NAME=iqn.2001-04.com.jade:storage.disk0
ISCSI_TARGET_IP=192.168.1.140 ISCSI_TARGET_PORT=3260 ISCSI_TARGET_GROUP=1 '
--initrd=/mnt/iscsi2/initrd.img-3.11.0-5-powerpc-e500mc -l
/mnt/iscsi2/vmlinux-3.11.0-5-powerpc-e500mc
with break enabled I can enter cli in the initramfs
-> This is embedded fsl eth1 ( 1Gbe ) with a cable :
(initramfs) ipconfig -t 10 -c dhcp -d eth1 &
(initramfs) IP-Config: eth1 hardware address 02:30:b0:00:10:01 mtu 1500 DHCP
IP-Config: no response after 10 secs - giving up
-> System is alive ( I have a prompt ) - The above SHOULD HAVE
WORKED since it is an active port.
This is embedded fsl eth1 - (10Gbe) - No cable
(initramfs) ipconfig -t 10 -c dhcp -d eth0 &
(initramfs)
(initramfs) IP-Config: eth0 hardware address 02:30:b0:00:10:00 mtu 1500 DHCP
IP-Config: no response after 10 secs - giving up
-> System is alive ( I have a prompt)
tg3 stand up card in pci-e slot:
(initramfs) ipconfig -t 10 -c dhcp -d eth4 &
(initramfs)
(initramfs) [ 218.394187] IPv6: ADDRCONF(NETDEV_UP): eth4: link is not ready
(initramfs)
(initramfs) [ 221.268533] tg3 0000:01:00.1 eth4: Link is up at 1000 Mbps,
full duplex
< hung >
iSCSI target information:
Server: CentOS 6.4 .x64 .
#passwd setup
#
# tgtadm --lld iscsi --op new --mode account --user ronnie --password password
# tgtadm --lld iscsi --op bind --mode account --tid 1 --user ronnie
#
# dd if=/dev/zero of=iscsi.disk0 bs=1024M count=10
tgtadm --lld iscsi --op delete --mode target --tid 1
tgtadm --lld iscsi --op new --mode target --tid 1 -T
iqn.2001-04.com.jade:storage.disk0
tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b
`pwd`/iscsi.disk0
tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL
tgtadm --lld iscsi --op show --mode target
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