LTTng » LTTng-modules

When doing "lttng enable-event -k --tracepoint -a":

BUG: sleeping function called from invalid context at kernel/rwsem.c:21

in_atomic(): 0, irqs_disabled(): 0, pid: 7795, name: lttng-sessiond

2 locks held by lttng-sessiond/7795:

#0: (sessions_mutex){......}, at: [<ffffffffa0346174>] lttng_session_enable+0x1f/0xa4 [lttng_tracer]

#1: (rcu_read_lock){......}, at: [<ffffffffa0330086>] rcu_read_lock+0x0/0x35 [lttng_statedump]

Pid: 7795, comm: lttng-sessiond Tainted: G O 3.3.8 #1

Call Trace:

[<ffffffff8106eb8c>] __might_sleep+0x114/0x118

[<ffffffff8178c220>] down_read+0x26/0x91

[<ffffffffa03303c1>] lttng_enumerate_task_vm_maps+0x5d/0xe3 [lttng_statedump]

[<ffffffffa03306fb>] do_lttng_statedump+0xc8/0x2b0 [lttng_statedump]

[<ffffffff8178b29e>] ? printk+0x68/0x6a

[<ffffffffa033090a>] lttng_statedump_start+0x27/0x2b [lttng_statedump]

[<ffffffffa03461d6>] lttng_session_enable+0x81/0xa4 [lttng_tracer]

[<ffffffffa0346bd8>] lttng_session_ioctl+0x56/0x70 [lttng_tracer]

[<ffffffff8114d227>] do_vfs_ioctl+0x26a/0x286

[<ffffffff8113ee60>] ? rcu_read_unlock+0x21/0x23

[<ffffffff8113efc8>] ? fget_light+0xb6/0xc5

[<ffffffff8114d299>] sys_ioctl+0x56/0x79

[<ffffffff81794d10>] tracesys+0xdd/0xe2