diff options
Diffstat (limited to '')
| -rw-r--r-- | kernel/trace/trace.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 5b7a6e9b0..98abff046 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5803,7 +5803,20 @@ waitagain: ret = print_trace_line(iter); if (ret == TRACE_TYPE_PARTIAL_LINE) { - /* don't print partial lines */ + /* + * If one print_trace_line() fills entire trace_seq in one shot, + * trace_seq_to_user() will returns -EBUSY because save_len == 0, + * In this case, we need to consume it, otherwise, loop will peek + * this event next time, resulting in an infinite loop. + */ + if (save_len == 0) { + iter->seq.full = 0; + trace_seq_puts(&iter->seq, "[LINE TOO BIG]\n"); + trace_consume(iter); + break; + } + + /* In other cases, don't print partial lines */ iter->seq.seq.len = save_len; break; } @@ -8661,6 +8674,8 @@ void __init early_trace_init(void) static_key_enable(&tracepoint_printk_key.key); } tracer_alloc_buffers(); + + init_events(); } void __init trace_init(void) |