[ltt-dev] ltt-sched unload fails

[Somshekar ChandrashekarKadam]

Hi,

Using 
0.10.0-pre43 with 2.6.24 kernel. Lttng works fine when made as as built in. 

when selected as module with the follwing kernel options. rmmod of ltt-sched fails. below is given O/P

Is module support not stable?. Please share some pointers on this. 
Thanks in advance

--------------------------
CONFIG_MARKERS=y

#
# Linux Trace Toolkit
#
CONFIG_LTT_TIMESTAMP=y
CONFIG_HAVE_LTT_UNSTABLE_TSC=y
CONFIG_HAVE_LTT_CLOCK=y
# CONFIG_HAVE_LTT_SYNTHETIC_TSC is not set
CONFIG_HAVE_LTT_DUMP_TABLES=y
CONFIG_LTT=y
CONFIG_LTT_RELAY=m
CONFIG_LTT_SERIALIZE=m
CONFIG_LTT_MARKER_CONTROL=m
CONFIG_LTT_TRACER=m
CONFIG_LTT_ALIGNMENT=y
CONFIG_LTT_VMCORE=y
CONFIG_LTT_HEARTBEAT=y
CONFIG_LTT_NETLINK_CONTROL=m
CONFIG_LTT_STATEDUMP=m
-------------------------------------

O/P
---------------------------------------------------------------------------------
WARNING: at kernel/marker.c:805 marker_probe_unregister_private_data()
Pid: 1232, comm: rmmod Not tainted 2.6.24_atom #4
 [<c014d1f2>] marker_probe_unregister_private_data+0x96/0xc8
 [<f8873297>] ltt_probe_unregister+0x2b/0x8d [ltt_marker_control]
 [<f887d06d>] probe_exit+0xd/0x41 [ltt_sched]
 [<c01301b6>] blocking_notifier_call_chain+0x17/0x1a
 [<c013aaf0>] sys_delete_module+0x18f/0x1db
 [<c0140064>] do_kimage_alloc+0x41/0x14c
 [<c01074b9>] do_syscall_trace+0x19b/0x1de
 [<c0103df2>] syscall_call+0x7/0xb
 [<c0410000>] cache_open+0xf/0x7b
 =======================
BUG: unable to handle kernel NULL pointer dereference at virtual address 00000028
printing eip: c014d1f2 *pde = 00000000 
Oops: 0002 [#1] PREEMPT 
LTT NESTING LEVEL : 0 <0>
Modules linked in: ltt_statedump ltt_serialize ltt_control ltt_marker_control ltt_tracer ltt_sched ltt_relay

Pid: 1232, comm: rmmod Not tainted (2.6.24_atom #4)
EIP: 0060:[<c014d1f2>] EFLAGS: 00010282 CPU: 0
EIP is at marker_probe_unregister_private_data+0x96/0xc8
EAX: c04ea111 EBX: 00000000 ECX: f7490f30 EDX: c04ea111
ESI: f7f3442c EDI: 00000000 EBP: f887d000 ESP: f74abf10
 DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
Process rmmod (pid: 1232, ti=f74aa000 task=f7fe4170 task.ti=f74aa000)
Stack: c0490bbd c049cb3a 00000325 c0427e60 f7f3442c f887d780 f7f34368 00000000 
       f8873297 f887d800 00000000 00000880 f74aa000 f887d06d f74aa000 c01301b6 
       ffffffff 00000000 c013aaf0 5f74746c 65686373 c0140064 bf976db0 00000081 
Call Trace:
 [<f8873297>] ltt_probe_unregister+0x2b/0x8d [ltt_marker_control]
 [<f887d06d>] probe_exit+0xd/0x41 [ltt_sched]
 [<c01301b6>] blocking_notifier_call_chain+0x17/0x1a
 [<c013aaf0>] sys_delete_module+0x18f/0x1db
 [<c0140064>] do_kimage_alloc+0x41/0x14c
 [<c01074b9>] do_syscall_trace+0x19b/0x1de
 [<c0103df2>] syscall_call+0x7/0xb
 [<c0410000>] cache_open+0xf/0x7b
 =======================
Code: 75 29 c7 44 24 0c 60 7e 42 c0 c7 44 24 08 25 03 00 00 c7 44 24 04 3a cb 49 c0 c7 04 24 bd 0b 49 c0 e8 08 03 fd ff e8 43 93 fb ff <89> 7b 28 80 4b 2c 01 ba b6 d2 14 c0 31 ff 8d 43 20 e8 d1 d7 fd 
EIP: [<c014d1f2>] marker_probe_unregister_private_data+0x96/0xc8 SS:ESP 0068:f74abf10
---[ end trace f803850988743740 ]---

Regards
Neelu


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