diff options
| -rw-r--r-- | kernel/trace/trace.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index de1638df2b09..f614a5fee614 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5226,7 +5226,20 @@ 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; } |