[ltt-dev] ltt-sched unload fails

[Mathieu Desnoyers]

* Somshekar ChandrashekarKadam (somshekar at celestialsys.com) wrote:
> 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

It's possible that in this version ltt-sched.ko has problems. I don't
think it much relevant now, because this module does not exist anymore.
You may want to try upgrading to a newer LTTng version and see if you
still have similar problems.

Mathieu

> 
> --------------------------
> 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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-- 
Mathieu Desnoyers
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