[IMPALA-10160] kernel_stack_watchdog cannot print user stack

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Backend
• Labels: supportability
• Epic Link: Network Debugging / Supportability Improvements
• Epic Color: ghx-label-1
• Assignee: Unassigned
• Reporter: Sahil Takiar
• Created: 09/Sep/20 18:16
• Updated: 08/Mar/23 02:58

Description

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:

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>

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