[jira] [Created] (IMPALA-10160) kernel_stack_watchdog cannot print user stack

["Sahil Takiar (Jira)" <ji...@apache.org>]

Sahil Takiar created IMPALA-10160:
-------------------------------------

             Summary: kernel_stack_watchdog cannot print user stack
                 Key: IMPALA-10160
                 URL: https://issues.apache.org/jira/browse/IMPALA-10160
             Project: IMPALA
          Issue Type: Bug
          Components: Backend
            Reporter: Sahil Takiar


I've seen this a few times now, the kernel_stack_watchdog is used in a few places in the KRPC code and it prints out the kernel + user stack whenever a thread is stuck in some method call for too long. The issue is that the user stack does not get printed:

{code}
W0908 17:15:00.365721  6605 kernel_stack_watchdog.cc:198] Thread 6612 stuck at outbound_call.cc:273 for 120ms:
Kernel stack:
[<ffffffff810f5126>] futex_wait_queue_me+0xc6/0x130
[<ffffffff810f5deb>] futex_wait+0x17b/0x280
[<ffffffff810f7b26>] do_futex+0x106/0x5a0
[<ffffffff810f8040>] SyS_futex+0x80/0x180
[<ffffffff816b4fc9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff

User stack:
<Not implemented: unable to take thread stack: signal handler unavailable>
{code}

It says that the signal handler of taking the thread stack is unavailable.



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