Segmentation fault running lttctl on SH4 target.

Hi,
using both lttng pre7 and pre 14 on my kernel 2.6.23.1 on SH4 target.
(sorry but I've not added pre23 yet)
I get a segmentation fault as soon as I run ltt control.

------------------------------------------------------
This is my kernel configuration (only LTT options):
    ...
    CONFIG_INSTRUMENTATION=y
    # CONFIG_PROFILING is not set
    CONFIG_MARKERS=y
    CONFIG_LTT_TIMESTAMP=y
    CONFIG_LTT_SYNTHETIC_TSC=y
    CONFIG_ARCH_HAS_LTT_CLOCK=y
    CONFIG_LTT=y
    CONFIG_LTT_RELAY=y
    CONFIG_LTT_SERIALIZE=y
    CONFIG_LTT_MARKER_CONTROL=y
    CONFIG_LTT_TRACER=y
    CONFIG_LTT_ALIGNMENT=y
    CONFIG_LTT_VMCORE=y
    CONFIG_LTT_HEARTBEAT=y
    CONFIG_LTT_NETLINK_CONTROL=y
    CONFIG_LTT_STATEDUMP=y

    #
    # Probes
    #
    CONFIG_LTT_PROBE_FS=y
    ...
--------------------------------------------------------------------
So after runnig ltt-armall I run the following

root@root:/home/root# lttctl -n trace -d -l /mnt/debugfs/ltt -t
/home/root/trace/
Linux Trace Toolkit Trace Control 0.45-11102007

ltt_control : trace trace


Unable to handle kernel paging request at virtual address c045fffc
pc = 84164fe2
*pde = 00000000
Oops: 0001 [#1]
Modules linked in:

Pid : 288, Comm:               lttctl
PC is at memset+0x2e/0x48
PC  : 84164fe2 SP  : 871c5c80 SR  : 40008000 TEA : c045fffc    Not tainted
R0  : 0003ffff R1  : 00000000 R2  : 40008001 R3  : ff00001c
R4  : c0460000 R5  : 00000000 R6  : 00200000 R7  : 00000000
R8  : c0260000 R9  : 00000000 R10 : 00000200 R11 : 84565a60
R12 : 87697400 R13 : 87697400 R14 : 84565a20
MACH: 00000000 MACL: 00000000 GBR : 29695450 PR  : 840492dc

Call trace:
[<8416107c>] ltt_relay_create_channel+0xdc/0x240
[<8406fbc0>] kmem_cache_alloc+0x0/0xa0
[<8416b220>] strncat+0x0/0x60
[<8415f702>] ltt_control+0xb82/0xdc0
[<8401af60>] printk+0x0/0x80
[<84161880>] ltt_control_input+0x120/0x1e0
[<8421c820>] skb_dequeue+0x0/0xa0
[<8401af60>] printk+0x0/0x80
[<8421d820>] kfree_skb+0x0/0x80
[<84237500>] netlink_ack+0x0/0x2c0
[<84238272>] netlink_data_ready+0x12/0x80
[<842364fe>] netlink_sendskb+0x1e/0x80
[<84238126>] netlink_sendmsg+0x206/0x340
[<84216992>] sock_sendmsg+0x72/0x120
[<84089cae>] dput+0x4e/0x1e0
[<84090ac8>] mntput_no_expire+0x28/0x140
[<84033540>] autoremove_wake_function+0x0/0x40
[<840215d2>] __tasklet_schedule+0xb2/0x100
[<841a12d6>] asc_interrupt+0x256/0x320
[<84162756>] ltt_trace+0x16/0x40
[<840038b0>] do_IRQ+0x30/0x80
[<84216cf6>] sys_sendto+0x96/0x120
[<840257ba>] run_timer_softirq+0x1a/0x220
[<84162756>] ltt_trace+0x16/0x40
[<8402101a>] tasklet_action+0xfa/0x180
[<84020c66>] do_softirq+0x66/0x80
[<84217f56>] sys_socketcall+0x196/0x380
[<84008224>] syscall_call+0xc/0x10
[<84217dc0>] sys_socketcall+0x0/0x380

Process: lttctl (pid: 288, stack limit = 871c4001)
Stack: (0x871c5c80 to 0x871c6000)
5c80: 8437a460 87697434 84565a20 87697414 8416107c 84574000 8406fbc0
84342d7c
5ca0: 84574160 8416b220 874e8000 87390000 84574168 87390000 87252ac4
84566010
5cc0: 8415f702 8401af60 00000002 00000000 84566010 84574000 845740fc
843477f8
5ce0: 84574160 00100000 00000002 00000000 8457413c 00000000 00010000
00000002
5d00: 00040000 00000002 00100000 84161880 8421c820 8401af60 8421d820
84237500
5d20: 84517660 84566000 84480800 00000000 00000000 00000000 00000000
00000000
5d40: 00000000 00000000 84238272 871c5e44 87f91780 84480800 871c5f18
87697e00
5d60: 00000230 84517600 842364fe 84517600 84238126 00000000 84566000
00000230
5d80: 00000000 00000000 00000120 00000000 00000000 00000000 00000000
84216992
5da0: 00000230 00000000 87d8d2e0 871c5f18 00000230 87f91780 871c4000
84089cae
5dc0: 84090ac8 00000000 00000001 ffffffff 00000000 00000000 00000000
00000000
5de0: 00000000 844a8060 00000000 00000000 8432b120 844a8060 84033540
871c5dfc
5e00: 871c5dfc 871c5e0c 840215d2 00000005 871c5e44 84395bc8 84569ce0
84395bdc
5e20: 841a12d6 84384000 00414008 0000000a 84395bc8 84395bc8 00000000
8456b860
5e40: 84162756 842e7208 00414008 0000000a 00000230 87f91780 00000000
871c5d88
5e60: 871c5f18 84384000 84347850 842e71d0 ffffff0f 8456b860 00000079
84340840
5e80: 840038b0 84216cf6 87f91780 871c5f04 7bc79a40 871c5f18 00000010
00000000
5ea0: 00000000 00000050 840257ba 84162756 843564a0 871c4000 84384000
84384024
5ec0: 00000000 ffffff0f 84385314 871c5ed4 8402101a 843084f4 84384000
871c4000
5ee0: 00000009 ffffff0f 00000005 84384064 00000001 871c5efc 84347850
00000005
5f00: 871c4000 84020c66 7bc797e8 00414008 29591854 ffffff0f 871c5e98
0000000c
5f20: 871c5f34 00000001 00000000 00000000 00000000 7bc79c70 00000000
00000000
5f40: 00000000 84217f56 7bc797e8 871c5f6c 7bc79a40 00000003 00000014
0000000b
5f60: 871c4000 00414018 0000000c 00000003 7bc79a40 00000230 00000000
00414018
5f80: 0000000c 84008224 00414008 29591854 ffffff0f 00000021 871c5ff8
84217dc0
5fa0: 00000000 00000450 7bc79c3c 00000066 0000000b 7bc797d0 00000230
00000000
5fc0: 0000000c 00000000 7bc7ae63 00402068 29591854 00414008 7bc797e8
7bc797d0
5fe0: 2962eb40 29580b9c 00008001 29695450 4a8568ad 0000001c 00000048
00000160
Segmentation fault
root@root:/home/root#


Using the kernel debugger, it seems the problem is in the
ltt_relay_create_channel function when the relay_open is invoked with
the channel_name = "cpu".

What do you think?
Do I need to apply any other patches?
Welcome advice.

Regards,
  Giuseppe

PS: I confirm that timestamp for SUPERH works fine.

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