* Avik Sil ([email protected]) wrote: > Hi Mathieu, > > Now as the ARM patch is in, I'm able to generate trace and read the > trace with babeltrace on Pandaboard. But while enabling the events, I > get following output: > > # lttng enable-event -a -k > [ 4304.827819] BUG: spinlock bad magic on CPU#1, ltt-sessiond/1305 > [ 4304.841735] lock: 81453c00, .magic: 00000000, .owner: <none>/-1, > .owner_cpu: 0 > [ 4304.857421] [<800110ad>] (unwind_backtrace+0x1/0x90) from > [<8022c847>] (do_raw_spin_lock+0x17/0xfc) > [ 4304.875213] [<8022c847>] (do_raw_spin_lock+0x17/0xfc) from > [<7f97c30f>] (channel_create+0xd6/0x158 [lib_ring_buffer]) > [ 4304.894866] [<7f97c30f>] (channel_create+0xd6/0x158 > [lib_ring_buffer]) from [<7f99856b>] (_channel_create+0x28/0x32 > [ltt_ring_buffer_client_discard]) > [ 4304.917755] [<7f99856b>] (_channel_create+0x28/0x32 > [ltt_ring_buffer_client_discard]) from [<7f98b507>] > (ltt_channel_create+0x12a/0x190 [ltt_relay]) > [ 4304.940551] [<7f98b507>] (ltt_channel_create+0x12a/0x190 [ltt_relay]) > from [<7f98c34b>] (lttng_abi_create_channel+0xba/0x158 [ltt_relay]) > [ 4304.962341] [<7f98c34b>] (lttng_abi_create_channel+0xba/0x158 > [ltt_relay]) from [<7f98c43f>] (lttng_session_ioctl+0x56/0x64 [ltt_relay]) > [ 4304.984436] [<7f98c43f>] (lttng_session_ioctl+0x56/0x64 [ltt_relay]) > from [<800baa49>] (do_vfs_ioctl+0x1a5/0x1dc) > [ 4305.004394] [<800baa49>] (do_vfs_ioctl+0x1a5/0x1dc) from [<800baab3>] > (sys_ioctl+0x33/0x4c) > [ 4305.022369] [<800baab3>] (sys_ioctl+0x33/0x4c) from [<8000c2c1>] > (ret_fast_syscall+0x1/0x50) > All kernel events are enabled in channel channel0 > > Can you please look into this issue?
Yes, it looks like I missed a spinlock initialization in there. Can you try with the following commit applied ? commit 6fb8de4b6c1e8dcc69ff6f67310c5cf29718101a Author: Mathieu Desnoyers <[email protected]> Date: Wed Sep 21 10:08:34 2011 -0400 lib ring buffer frontend: add missing lock initialization Thanks, Mathieu > > Regards, > Avik > > On Sunday 11 September 2011 01:19 AM, Mathieu Desnoyers wrote: > > * Avik Sil ([email protected]) wrote: > >> 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 > [...] > > > > Hi Avik, > > > > Can I get your kernel .config ? Also, adding a printk in lttng-modules > > wrapper/vmalloc.h, just after vmalloc_sync_all_sym = (void *) > > kallsyms_lookup_name("vmalloc_sync_all"); > > > > printing the vmalloc_sync_all_sym pointer value would be clearly > > helpful. I would think ARM does not implement vmalloc_sync_all, so the > > dummy mm/vmalloc.c vmalloc_sync_all weak symbol should be used as a > > valid empty function. Please grep for vmalloc_sync_all under your > > arch/arm to see if your particular omap flavor is implementing a > > vmalloc_sync_all. > > > > Thanks! > > > > Mathieu > > > >> > >> Regards, > >> Avik > >> > >> _______________________________________________ > >> ltt-dev mailing list > >> [email protected] > >> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev > >> > > > -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com _______________________________________________ ltt-dev mailing list [email protected] http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
