On Wed, 24 Apr 2013 16:12:41 +0200, Jiri Olsa wrote: > I got following lockup for record command: > > # ./perf --no-pager ftrace record ls > ... > hangs > > in other terminal: > > # pstack 14237 > Thread 2 (Thread 0x7f3f1aa1d700 (LWP 14241)): > #0 0x0000003cec20b595 in pthread_cond_wait@@GLIBC_2.3.2 () from > /lib64/libpthread.so.0 > #1 0x0000000000446ebe in record_ftrace_raw_buffer (arg=0x21f9ce0) at > builtin-ftrace.c:451 > #2 0x0000003cec207d14 in start_thread () from /lib64/libpthread.so.0 > #3 0x0000003cebaf168d in clone () from /lib64/libc.so.6 > Thread 1 (Thread 0x7f3f1ba209c0 (LWP 14237)): > #0 0x0000003cec208e60 in pthread_join () from /lib64/libpthread.so.0 > #1 0x0000000000449c8c in do_ftrace_record > (ftrace=ftrace@entry=0x7fff1377d240) at builtin-ftrace.c:682 > #2 0x000000000044a57b in __cmd_ftrace_record (argv=0x7fff1377d818, > argc=<optimized out>, ftrace=0x7fff1377d240) at builtin-ftrace.c:1535 > #3 cmd_ftrace (argc=2, argv=0x7fff1377d818, prefix=<optimized out>) at > builtin-ftrace.c:1655 > #4 0x000000000041a763 in run_builtin (p=p@entry=0x7d58a0, > argc=argc@entry=3, argv=argv@entry=0x7fff1377d818) at perf.c:320 > #5 0x0000000000419faf in handle_internal_command (argv=0x7fff1377d818, > argc=3) at perf.c:377 > #6 run_argv (argv=0x7fff1377d600, argcp=0x7fff1377d60c) at perf.c:421 > #7 main (argc=3, argv=0x7fff1377d818) at perf.c:522 >
How often can you reproduce it? I can't. :( But it looks there's a race between cond_wait() and cond_broatcast(). I'll take a look at that. Thanks for the test and the report, Namhyung -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
