[ltt-dev] LTTng 2.0 on ARM

[Avik Sil]

Hi,

I'm trying to use LTTng 2.0 on a Pandaboard. After building the latest
tools and modules I tried to run lttng and got following error:

# lttng list -k
Spawning a session daemon
[   55.723144] Internal error: Oops - undefined instruction: 0 [#1]
PREEMPT SMP
[   55.736511] Modules linked in: lttng_ftrace(+) smsc95xx
[   55.745025] CPU: 1    Not tainted  (3.0.0-1002-linaro-omap
#3~ppa~natty-Ubuntu)
[   55.758697] PC is at vmalloc_sync_all+0x0/0x8
[   55.766326] LR is at init_module+0x12/0x1c [lttng_ftrace]
[   55.774993] pc : [<c00ef390>]    lr : [<bf8071fb>]    psr: 60000113
[   55.774993] sp : eb9a5f50  ip : c0474c17  fp : 00000000
[   55.793121] r10: 00000000  r9 : 00000000  r8 : c0645160
[   55.801574] r7 : bf8071e9  r6 : 00000000  r5 : 006f2ec0  r4 : bf807424
[   55.811370] r3 : 271aed1c  r2 : 271aed1c  r1 : bf80739a  r0 : c00ef390
[   55.821105] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM
Segment user
[   55.831481] Control: 50c5387d  Table: 9984c04a  DAC: 00000015
[   55.840454] Process modprobe (pid: 1580, stack limit = 0xeb9a42f8)
[   55.849914] Stack: (0xeb9a5f50 to 0xeb9a6000)
[   55.857421] 5f40:                                     eb9a4000
c00584b7 00000000 00000001
[   55.871765] 5f60: bf807424 bf807424 006f2ec0 bf807424 006f2ec0
00000000 00001a19 c005ca04
[   55.886108] 5f80: eb9a4000 c00b1ceb 40108000 00001a19 006f2ec0
bee9d4b4 006f2ef8 00000000
[   55.900726] 5fa0: 00000080 c005c801 bee9d4b4 006f2ef8 40108000
00001a19 006f2ec0 bee9d414
[   55.915527] 5fc0: bee9d4b4 006f2ef8 00000000 00000080 0000b979
006f2f04 006f2ec0 00000000
[   55.930358] 5fe0: 00017edc bee9d418 0000aedf 401c8ae0 60000110
40108000 00000000 00000000
[   55.945343] [<c00ef390>] (vmalloc_sync_all+0x0/0x8) from [<bf8071fb>]
(init_module+0x12/0x1c [lttng_ftrace])
[   55.962280] [<bf8071fb>] (init_module+0x12/0x1c [lttng_ftrace]) from
[<c00584b7>] (do_one_initcall+0x6b/0xfc)
[   55.979339] [<c00584b7>] (do_one_initcall+0x6b/0xfc) from
[<c00b1ceb>] (sys_init_module+0x4b/0x11c)
[   55.995544] [<c00b1ceb>] (sys_init_module+0x4b/0x11c) from
[<c005c801>] (ret_fast_syscall+0x1/0x50)
[   56.011932] Code: e8bdb007 bf008ff0 c06174d0 c0b83db4 (f85db500)
[   56.028320] ---[ end trace 14e0c48d8bb29e79 ]---
Segmentation fault


After investigation I found that the oops happened while installing
lttng-ftrace module. Any help resolving it will be appreciated. My
kernel version is 3.0.

Regards,
Avik