# ScyllaDB crashes with iostream errors **URL:** \ **Category:** ScyllaDB\ **Tags:** error-message, io\ **Created:** [July 29, 2025, 8:39am UTC](https://forum.scylladb.com/t/scylladb-crashes-with-iostream-errors/5017 "2025-07-29T08:39:04Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Takashi](https://avatars.discourse-cdn.com/v4/letter/t/82dd89/32.png) [@Takashi](https://forum.scylladb.com/u/Takashi)\ **Post date:** [July 29, 2025, 8:39am UTC](https://forum.scylladb.com/t/scylladb-crashes-with-iostream-errors/5017/1 "2025-07-29T08:39:04Z")
Hello, I’d like to share the logs from one of my ScyllaDB nodes. I’m not sure what’s causing the issue. This has happened for the second time. The first time it occurred, I was trying to shut down the node or one of other nodes and it crashed. (I don’t remember clearly) Do you have any idea why this might be happening? Thanks. > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: scylla: seastar/include/seastar/core/iostream.hh:420: seastar::output\_stream::~output\_stream() [CharType = char]: Assertion `!\_end && !\_zc\_bufs && “Was this stream properly closed?”’ failed. > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: Aborting on shard 0, in scheduling group streaming. > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: Backtrace: > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x59d7144 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x59965bb > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x59cbf16 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: /opt/scylladb/libreloc/libc.so.6+0x40cff > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: /opt/scylladb/libreloc/libc.so.6+0x994a3 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: /opt/scylladb/libreloc/libc.so.6+0x40c4d > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: /opt/scylladb/libreloc/libc.so.6+0x28901 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: /opt/scylladb/libreloc/libc.so.6+0x2881d > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: /opt/scylladb/libreloc/libc.so.6+0x38d86 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x1b485d4 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x5d8b600 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x59a691f > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x59a7e8a > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x59a9077 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x59a8428 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x5938773 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x5937ad3 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x13842a5 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x1385c60 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x13826c3 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: /opt/scylladb/libreloc/libc.so.6+0x2a087 > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: /opt/scylladb/libreloc/libc.so.6+0x2a14a > Jul 21 09:23:20 scylladb-node-3 scylla[26690]: 0x137fd44 > Jul 21 09:24:18 scylladb-node-3 scylla[200784]: Scylla version 6.1.2-0.20240915.b60f9ef4c223 with build-id c713ac9e819492d7560aa3ad461c43cf404c977b starting … > Jul 21 09:24:18 scylladb-node-3 scylla[200784]: command used: “/usr/bin/scylla --log-to-syslog 1 --log-to-stdout 0 --default-log-level info --network-stack posix --io-properties-file=/etc/scylla.d/io\_properties.yaml --cpuset 0-3 --lock-memory=1” _Installation details_ #ScyllaDB version: 6.1.2 #Cluster size: 3 Node (4 Core - 8 GB Ram) #os (RHEL/CentOS/Ubuntu/AWS AMI): Rocky Linux 9 ---
**Author:** ![Botond\_Denes](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.scylladb.com/botond_denes/32/163_2.png) [@Botond\_Denes](https://forum.scylladb.com/u/Botond_Denes)\ **Post date:** [August 1, 2025, 6:41am UTC](https://forum.scylladb.com/t/scylladb-crashes-with-iostream-errors/5017/2 "2025-08-01T06:41:04Z")
6.2 is not supported anymore, please update. In general, when posting backtraces, please resolve them via [Scylla relocatable packages](http://backtrace.scylladb.com/index.html) For posterity, here is the resolved backtrace: ```auto Jul 21 09:23:20 scylladb-node-3 scylla[26690]: Backtrace: Jul 21 09:23:20 scylladb-node-3 scylla[26690]: [Backtrace #0] void seastar::backtrace(seastar::backtrace_buffer::append_backtrace()::'lambda'(seastar::frame)&&) at ./build/release/seastar/./seastar/include/seastar/util/backtrace.hh:68 seastar::backtrace_buffer::append_backtrace() at ./build/release/seastar/./seastar/src/core/reactor.cc:826 (inlined by) seastar::print_with_backtrace(seastar::backtrace_buffer&, bool) at ./build/release/seastar/./seastar/src/core/reactor.cc:859 seastar::print_with_backtrace(char const*, bool) at ./build/release/seastar/./seastar/src/core/reactor.cc:871 (inlined by) seastar::sigabrt_action() at ./build/release/seastar/./seastar/src/core/reactor.cc:4033 (inlined by) void seastar::install_oneshot_signal_handler<6, (void (*)())(&seastar::sigabrt_action())>()::'lambda'(int, siginfo_t*, void*)::operator()(int, siginfo_t*, void*) const at ./build/release/seastar/./seastar/src/core/reactor.cc:4009 (inlined by) void seastar::install_oneshot_signal_handler<6, (void (*)())(&seastar::sigabrt_action())>()::'lambda'(int, siginfo_t*, void*)::__invoke(int, siginfo_t*, void*) at ./build/release/seastar/./seastar/src/core/reactor.cc:4005 /data/scylla-s3-reloc.cache/by-build-id/c713ac9e819492d7560aa3ad461c43cf404c977b/extracted/scylla/libreloc/libc.so.6: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=8f53abaad945a669f2bdcd25f471d80e077568ef, for GNU/Linux 3.2.0, not stripped ?? at ??:0 __pthread_kill_implementation at ??:0 gsignal at ??:0 abort at ??:0 __assert_fail_base.cold at ??:0 __assert_fail at ??:0 seastar::output_stream::~output_stream() at ././seastar/include/seastar/core/iostream.hh:420 std::_Head_base<0ul, seastar::output_stream, false>::~_Head_base() at /usr/lib/gcc/x86_64-redhat-linux/14/../../../../include/c++/14/tuple:83 (inlined by) seastar::internal::do_with_state>, seastar::future>::~do_with_state() at ./build/release/seastar/./seastar/include/seastar/core/do_with.hh:40 (inlined by) seastar::internal::do_with_state>, seastar::future>::run_and_dispose() at ./build/release/seastar/./seastar/include/seastar/core/do_with.hh:48 seastar::reactor::run_tasks(seastar::reactor::task_queue&) at ./build/release/seastar/./seastar/src/core/reactor.cc:2651 seastar::reactor::run_some_tasks() at ./build/release/seastar/./seastar/src/core/reactor.cc:3114 seastar::reactor::do_run() at ./build/release/seastar/./seastar/src/core/reactor.cc:3282 seastar::reactor::run() at ./build/release/seastar/./seastar/src/core/reactor.cc:3172 seastar::app_template::run_deprecated(int, char**, std::function&&) at ./build/release/seastar/./seastar/src/core/app-template.cc:276 seastar::app_template::run(int, char**, std::function ()>&&) at ./build/release/seastar/./seastar/src/core/app-template.cc:167 scylla_main(int, char**) at ./main.cc:699 std::function::operator()(int, char**) const at /usr/lib/gcc/x86_64-redhat-linux/14/../../../../include/c++/14/bits/std_function.h:591 main at ./main.cc:2208 __libc_start_call_main at ??:0 __libc_start_main@GLIBC_2.2.5 at ??:0 _start at ??:0 ``` I am not familiar with this crash, but it is very likely that we have fixed it since, 6.1 is quite an old release. Please upgrade and see if it reproduces with a supported version, if so we will investigate.