[ltt-dev] kernel bug in the Lttng branch

[royer fabien]

HI,

I am using the Beagle board using an ARM cortexA8 prosessor.
I found one annoying issue while using lttv-gui. The issue is that my ethernet connection is always disconnected after exporting the DISPLAY and examining the trace.

The beagle board doens't have a display so you need to export thought the ethernet. And the Beagleboard doesn't have an ethernet port so you need to use the USB host and plug a usb2eth adaptor.

I am using the git : git://git.kernel.org/pub/scm/linux/kernel/git/compudj/linux-2.6-lttng.git
config: /arch/arm/config/omap3_beagle_defconfig

From my investigation the file Drivers/usb/core/hub.c line 3343 must be buggy but I didnot find the bug myself. So I am asking for help.

Oops errror found:

root at beagleboard:~# hub 1-0:1.0: port 2 disabled by hub (EMI?), re-enabling...
Unable to handle kernel NULL pointer dereference at virtual address 00000034
pgd = c0004000
[00000034] *pgd=00000000
Internal error: Oops: 17 [#1]
last sysfs file: /sys/devices/platform/i2c_omap.3/i2c-3/i2c-dev/i2c-3/uevent
Modules linked in:
CPU: 0    Not tainted  (2.6.33.1-ga0ff4c3 #6)
PC is at usb_hcd_unlink_urb+0x48/0x6c
LR is at kobject_get+0x14/0x1c
pc : [<c022cfcc>]    lr : [<c01a9fdc>]    psr: 60000013
sp : cf90be98  ip : 00000004  fp : cfbb4c00
r10: cfbb4de0  r9 : cfbc8000  r8 : cf930324
r7 : fffffffe  r6 : 60000013  r5 : 00000000  r4 : cf3c5240
r3 : 00000000  r2 : fffffffe  r1 : cf3c5240  r0 : cf990400
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 10c5387d  Table: 8f3bc019  DAC: 00000017
Process khubd (pid: 131, stack limit = 0xcf90a2e8)
Stack: (0xcf90be98 to 0xcf90c000)
be80:                                                       cf3c524c cf3c5240
bea0: cf930318 cf930324 cfbc8000 c022db84 cf3c5240 cf930324 cfbc8000 c022c870
bec0: cf3c5240 cf930318 cf3c5240 cf930318 cf930324 c022c928 cf990400 cf930318
bee0: 00000001 cf99047c cf990468 c022e600 cf990400 00000003 0000001f c022e62c
bf00: cf990400 cf99049c 0000001f c022a034 cf9246c0 00000002 00000002 cfbb4c00
bf20: 00000501 cfbc8000 ffffffed c022a6fc cf90bf64 cf8e9270 cf8e9270 00000001
bf40: cf9247e0 cf99049c cf9247e0 00000002 00000001 cfbb4c04 cf9246c1 00000000
bf60: cf90a000 cf924704 cf9247c0 cf92470c cf92475c cf9246c8 cfbb4c9c 00000009
bf80: cf924708 cf924700 00000000 cf8e9240 c006dc58 cf90bf94 cf90bf94 c0072394
bfa0: 05010002 cf90a000 cf90bfcc cf823f68 cf90bfd4 c022a2bc 00000000 00000000
bfc0: 00000000 00000000 00000000 c006d854 00000000 00000000 cf90bfd8 cf90bfd8
bfe0: 00000000 00000000 00000000 00000000 00000000 c002ddac 00000000 00000000
[<c022cfcc>] (usb_hcd_unlink_urb+0x48/0x6c) from [<c022db84>] (usb_kill_urb+0x48/0xec)
[<c022db84>] (usb_kill_urb+0x48/0xec) from [<c022c928>] (usb_hcd_flush_endpoint+0xac/0xc4)
[<c022c928>] (usb_hcd_flush_endpoint+0xac/0xc4) from [<c022e600>] (usb_disable_endpoint+0x6c/0x84)
[<c022e600>] (usb_disable_endpoint+0x6c/0x84) from [<c022e62c>] (usb_disable_device+0x14/0xf0)
[<c022e62c>] (usb_disable_device+0x14/0xf0) from [<c022a034>] (usb_disconnect+0x88/0xe0)
[<c022a034>] (usb_disconnect+0x88/0xe0) from [<c022a6fc>] (hub_thread+0x440/0xe38)
[<c022a6fc>] (hub_thread+0x440/0xe38) from [<c006d854>] (kthread+0x78/0x80)
[<c006d854>] (kthread+0x78/0x80) from [<c002ddac>] (kernel_thread_exit+0x0/0x8)
Code: 1a000009 e5943028 e1a02007 e1a01004 (e5930034)
---[ end trace ec79f3ceae39486f ]---



      
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