136 lines
4.9 KiB
ReStructuredText
136 lines
4.9 KiB
ReStructuredText
=====================
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Decoding Stack Traces
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=====================
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**Topic: Decoding stack traces in ScyllaDB logs**
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**Environment: Any ScyllaDB setup on any supported OS**
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**Audience: All**
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Synopsis
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--------
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This article describes how to decode the stack traces found in ScyllaDB logs.
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What are Stack Traces?
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----------------------
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Stack traces can appear in the logs due to various errors or in the course of regular database operation. It is useful to be able to decode the trace in order to understand what exactly happened. Decoding the stack trace requires the Debug binaries for the specific ScyllaDB build and OS in use are installed.
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Note that sharing the stack trace as part of your support ticket or Github issue, helps the ScyllaDB support team to understand the issue better.
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Install Debug Binary files
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--------------------------
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Install the Debug binaries according to your OS distribution
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.. tabs::
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.. group-tab:: RPM based distributions
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.. code-block:: none
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yum install scylla-debuginfo
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.. group-tab:: DEB based distributions
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.. code-block:: none
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apt-get install scylla-server-dbg
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Validate the debug binary file name
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-----------------------------------
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To later determine the actual debug binary, look in the ``/usr/lib/debug/`` directory
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for a file named scylla.debug.
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For example:
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.. code-block:: none
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# find /usr/lib/debug/ | grep scylla.debug
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/usr/lib/debug/usr/bin/scylla.debug
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Locate and Analyze the Logs
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----------------------------
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**Procedure**
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#. Copy the stack from the :doc:`system log </getting-started/logging>` and place it in a file (trace.txt, for example).
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.. code-block:: none
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Jul 14 16:56:50 hostname01 scylla: Aborting on shard 8.
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Jul 14 16:56:50 hostname01 scylla: Backtrace:
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Jul 14 16:56:50 hostname01 scylla: 0x0000000000688602
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Jul 14 16:56:50 hostname01 scylla: 0x00000000005a36fc
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Jul 14 16:56:50 hostname01 scylla: 0x00000000005a39a5
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Jul 14 16:56:50 hostname01 scylla: 0x00000000005a3a53
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Jul 14 16:56:50 hostname01 scylla: /lib64/libpthread.so.0+0x000000000000f6cf
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Jul 14 16:56:50 hostname01 scylla: /lib64/libc.so.6+0x0000000000036276
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Jul 14 16:56:50 hostname01 scylla: /lib64/libc.so.6+0x0000000000037967
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Jul 14 16:56:50 hostname01 scylla: 0x00000000024ce37b
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Jul 14 16:56:50 hostname01 scylla: 0x00000000024d2a47
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Jul 14 16:56:50 hostname01 scylla: 0x00000000024df1d5
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Jul 14 16:56:50 hostname01 scylla: 0x00000000023dccec
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Jul 14 16:56:50 hostname01 scylla: 0x00000000023feac1
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Jul 14 16:56:50 hostname01 scylla: 0x00000000024324b9
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Jul 14 16:56:50 hostname01 scylla: 0x00000000024357e4
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Jul 14 16:56:50 hostname01 scylla: 0x0000000001eace90
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Jul 14 16:56:50 hostname01 scylla: 0x0000000001eaf944
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Jul 14 16:56:50 hostname01 scylla: 0x0000000000584ab6
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Jul 14 16:56:50 hostname01 scylla: 0x0000000000584c71
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Jul 14 16:56:50 hostname01 scylla: 0x00000000006522ff
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Jul 14 16:56:50 hostname01 scylla: 0x00000000006554e5
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Jul 14 16:56:50 hostname01 scylla: 0x000000000073d3cd
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Jul 14 16:56:50 hostname01 scylla: /lib64/libpthread.so.0+0x0000000000007e24
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Jul 14 16:56:50 hostname01 scylla: /lib64/libc.so.6+0x00000000000febac
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#. Locate the files for backtrace.
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.. code-block:: shell
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find . -name "scylla*.debug"
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With ScyllaDB 4.1 for example, returns:
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.. code-block:: shell
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/usr/lib/debug/opt/scylladb/libexec/scylla-4.1.1-0.20200703.1d9bbbc9577.x86_64.debug
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#. Run the decoder:
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.. code-block:: none
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./seastar-addr2line -e /usr/lib/debug/usr/bin/scylla.debug -f trace.txt > trace_decoded.txt
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``trace_decoded.txt`` now contains the decoded version of the stack trace:
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For example:
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.. code-block:: none
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void seastar::backtrace<seastar::backtrace_buffer::append_backtrace()::{lambda(seastar::frame)#1}>(seastar::backtrace_buffer::append_backtrace()::{lambda(seastar::frame)#1}&&) at /usr/src/debug/scylla-4.1.1/seastar/util/backtrace.hh:56
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seastar::backtrace_buffer::append_backtrace() at /usr/src/debug/scylla-4.1.1/seastar/core/reactor.cc:390
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(inlined by) print_with_backtrace at /usr/src/debug/scylla-4.1.1/seastar/core/reactor.cc:411
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seastar::print_with_backtrace(char const*) at /usr/src/debug/scylla-4.1.1/seastar/core/reactor.cc:418
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sigabrt_action at /usr/src/debug/scylla-4.1.1/seastar/core/reactor.cc:3939
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(inlined by) operator() at /usr/src/debug/scylla-4.1.1/seastar/core/reactor.cc:3921
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(inlined by) _FUN at /usr/src/debug/scylla-4.1.1/seastar/core/reactor.cc:3917
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...
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seastar::reactor::run_tasks(seastar::reactor::task_queue&) at /usr/src/debug/scylla-4.1.1/seastar/core/reactor.cc:2621
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seastar::reactor::run_some_tasks() at /usr/src/debug/scylla-4.1.1/seastar/core/reactor.cc:3033
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seastar::reactor::run_some_tasks() at /opt/scylladb/include/c++/7/chrono:377
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(inlined by) seastar::reactor::run() at /usr/src/debug/scylla-4.1.1/seastar/core/reactor.cc:3180
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