From: Mathieu Desnoyers Date: Wed, 21 Sep 2011 14:08:34 +0000 (-0400) Subject: lib ring buffer frontend: add missing lock initialization X-Git-Tag: v2.0-pre9~27 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=6fb8de4b6c1e8dcc69ff6f67310c5cf29718101a;p=lttng-modules.git lib ring buffer frontend: add missing lock initialization [...] while enabling the events, I get following output: [ 4304.827819] BUG: spinlock bad magic on CPU#1, ltt-sessiond/1305 [ 4304.841735] lock: 81453c00, .magic: 00000000, .owner: /-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 Reported-by: Avik Sil Signed-off-by: Mathieu Desnoyers --- diff --git a/lib/ringbuffer/ring_buffer_frontend.c b/lib/ringbuffer/ring_buffer_frontend.c index 3003dd83..a45373b0 100644 --- a/lib/ringbuffer/ring_buffer_frontend.c +++ b/lib/ringbuffer/ring_buffer_frontend.c @@ -1702,3 +1702,11 @@ int lib_ring_buffer_reserve_slow(struct lib_ring_buffer_ctx *ctx) return 0; } EXPORT_SYMBOL_GPL(lib_ring_buffer_reserve_slow); + +void __init init_lib_ring_buffer_frontend(void) +{ + int cpu; + + for_each_possible_cpu(cpu) + spin_lock_init(&per_cpu(ring_buffer_nohz_lock, cpu)); +}