Why does Redis server crash "Out Of Memory allocating 16400 bytes!"?

Question

Redis

Dedicated server
CPU: Intel Xeon-E 2388G - 8c/16t - 3.2 GHz/4.6 GHz
Memory: DDR4 64Gb
Disk: 1.92 TB SSD NVMe
System: Ubuntu Server 20.04 "Focal Fossa"

spoiler

Out Of Memory allocating 16400 bytes!

=== REDIS BUG REPORT START: Cut & paste starting from here ===
735991:M 04 Feb 2022 12:05:24.303 # ------------------------------------------------
735991:M 04 Feb 2022 12:05:24.303 # !!! Software Failure. Press left mouse button to continue
735991:M 04 Feb 2022 12:05:24.303 # Guru Meditation: Redis aborting for OUT OF MEMORY #server.c:3925
735991:M 04 Feb 2022 12:05:24.303 # (forcing SIGSEGV in order to print the stack trace)
735991:M 04 Feb 2022 12:05:24.303 # ------------------------------------------------
735991:M 04 Feb 2022 12:05:24.303 # Redis 5.0.7 crashed by signal: 11
735991:M 04 Feb 2022 12:05:24.303 # Crashed running the instruction at: 0x5573e0abf1d8
735991:M 04 Feb 2022 12:05:24.303 # Accessing address: 0xffffffffffffffff
735991:M 04 Feb 2022 12:05:24.303 # Failed assertion: <no assertion failed> (<no file>:0)

------ STACK TRACE ------
EIP:
/usr/bin/redis-server 127.0.0.1:6379(_serverPanic+0x148)[0x5573e0abf1d8]

Backtrace:
/usr/bin/redis-server 127.0.0.1:6379(logStackTrace+0x4f)[0x5573e0ac13af]
/usr/bin/redis-server 127.0.0.1:6379(sigsegvHandler+0xb5)[0x5573e0ac1bb5]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x153c0)[0x7fd878a593c0]
/usr/bin/redis-server 127.0.0.1:6379(_serverPanic+0x148)[0x5573e0abf1d8]
/usr/bin/redis-server 127.0.0.1:6379(redisOutOfMemoryHandler+0x3a)[0x5573e0a7733a]
/usr/bin/redis-server 127.0.0.1:6379(zmalloc+0x47)[0x5573e0a81227]
/usr/bin/redis-server 127.0.0.1:6379(+0x406a1)[0x5573e0a886a1]
/usr/bin/redis-server 127.0.0.1:6379(addReplyDouble+0xe4)[0x5573e0a89ef4]
/usr/bin/redis-server 127.0.0.1:6379(zrangeGenericCommand+0x51e)[0x5573e0aaaefe]
/usr/bin/redis-server 127.0.0.1:6379(call+0xaf)[0x5573e0a79b2f]
/usr/bin/redis-server 127.0.0.1:6379(execCommand+0xa0)[0x5573e0abe4c0]
/usr/bin/redis-server 127.0.0.1:6379(call+0xaf)[0x5573e0a79b2f]
/usr/bin/redis-server 127.0.0.1:6379(processCommand+0x556)[0x5573e0a7a436]
/usr/bin/redis-server 127.0.0.1:6379(processInputBuffer+0x171)[0x5573e0a8b0a1]
/usr/bin/redis-server 127.0.0.1:6379(aeProcessEvents+0x112)[0x5573e0a732d2]
/usr/bin/redis-server 127.0.0.1:6379(aeMain+0x2b)[0x5573e0a736fb]
/usr/bin/redis-server 127.0.0.1:6379(main+0x4de)[0x5573e0a6dade]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x7fd8788790b3]
/usr/bin/redis-server 127.0.0.1:6379(_start+0x2e)[0x5573e0a6dd3e]

------ INFO OUTPUT ------
# Server
redis_version:5.0.7
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:636cde3b5c7a3923
redis_mode:standalone
os:Linux 5.4.0-91-generic x86_64
arch_bits:64
multiplexing_api:epoll
atomicvar_api:atomic-builtin
gcc_version:9.2.1
process_id:735991
run_id:2d1c52d190d781a088b5c5f2fffc11bddfbfec14
tcp_port:6379
uptime_in_seconds:387322
uptime_in_days:4
hz:10
configured_hz:10
lru_clock:16586372
executable:/usr/bin/redis-server
config_file:/etc/redis/redis.conf

# Clients
connected_clients:12
client_recent_max_input_buffer:2
client_recent_max_output_buffer:57739264
blocked_clients:0

# Memory
used_memory:914899080
used_memory_human:872.52M
used_memory_rss:988934144
used_memory_rss_human:943.12M
used_memory_peak:1018331200
used_memory_peak_human:971.16M
used_memory_peak_perc:89.84%
used_memory_overhead:4830596
used_memory_startup:796240
used_memory_dataset:910068484
used_memory_dataset_perc:99.56%
allocator_allocated:911523528
allocator_active:921133056
allocator_resident:989069312
total_system_memory:67335008256
total_system_memory_human:62.71G
used_memory_lua:41984
used_memory_lua_human:41.00K
used_memory_scripts:0
used_memory_scripts_human:0B
number_of_cached_scripts:0
maxmemory:0
maxmemory_human:0B
maxmemory_policy:noeviction
allocator_frag_ratio:1.01
allocator_frag_bytes:9609528
allocator_rss_ratio:1.07
allocator_rss_bytes:67936256
rss_overhead_ratio:1.00
rss_overhead_bytes:-135168
mem_fragmentation_ratio:1.09
mem_fragmentation_bytes:77643448
mem_not_counted_for_evict:0
mem_replication_backlog:0
mem_clients_slaves:0
mem_clients_normal:3967564
mem_aof_buffer:0
mem_allocator:jemalloc-5.2.1
active_defrag_running:0
lazyfree_pending_objects:0

# Persistence
loading:0
rdb_changes_since_last_save:11618
rdb_bgsave_in_progress:0
rdb_last_save_time:1643976309
rdb_last_bgsave_status:ok
rdb_last_bgsave_time_sec:4
rdb_current_bgsave_time_sec:-1
rdb_last_cow_size:67022848
aof_enabled:0
aof_rewrite_in_progress:0
aof_rewrite_scheduled:0
aof_last_rewrite_time_sec:-1
aof_current_rewrite_time_sec:-1
aof_last_bgrewrite_status:ok
aof_last_write_status:ok
aof_last_cow_size:0

# Stats
total_connections_received:28
total_commands_processed:243415647
instantaneous_ops_per_sec:606
total_net_input_bytes:21289486937
total_net_output_bytes:7955222927584
instantaneous_input_kbps:51.94
instantaneous_output_kbps:7.75
rejected_connections:0
sync_full:0
sync_partial_ok:0
sync_partial_err:0
expired_keys:13
expired_stale_perc:0.00
expired_time_cap_reached_count:0
evicted_keys:0
keyspace_hits:2308838
keyspace_misses:562996
pubsub_channels:0
pubsub_patterns:0
latest_fork_usec:51304
migrate_cached_sockets:0
slave_expires_tracked_keys:0
active_defrag_hits:0
active_defrag_misses:0
active_defrag_key_hits:0
active_defrag_key_misses:0

# Replication
role:master
connected_slaves:0
master_replid:00fec0c5f2f1d8b03259a55e70f9d116be31d893
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0

# CPU
used_cpu_sys:5862.124498
used_cpu_user:25935.504398
used_cpu_sys_children:1969.233247
used_cpu_user_children:21740.043277

# Commandstats
cmdstat_expire:calls=18216855,usec=12486181,usec_per_call=0.69
cmdstat_scan:calls=5183,usec=1698273,usec_per_call=327.66
cmdstat_zremrangebyrank:calls=66,usec=20,usec_per_call=0.30
cmdstat_zrem:calls=1229,usec=868,usec_per_call=0.71
cmdstat_del:calls=63,usec=82,usec_per_call=1.30
cmdstat_zremrangebyscore:calls=18727742,usec=261476333,usec_per_call=13.96
cmdstat_lpush:calls=18216845,usec=71587895,usec_per_call=3.93
cmdstat_smembers:calls=12896,usec=24079,usec_per_call=1.87
cmdstat_ltrim:calls=18216845,usec=44053712,usec_per_call=2.42
cmdstat_unwatch:calls=19061039,usec=4475704,usec_per_call=0.23
cmdstat_zcard:calls=224529,usec=72024,usec_per_call=0.32
cmdstat_setnx:calls=33,usec=119,usec_per_call=3.61
cmdstat_llen:calls=74843,usec=91836,usec_per_call=1.23
cmdstat_zrangebyscore:calls=648,usec=2175,usec_per_call=3.36
cmdstat_zrevrange:calls=1419118,usec=87614795,usec_per_call=61.74
cmdstat_watch:calls=10,usec=64,usec_per_call=6.40
cmdstat_exec:calls=19061029,usec=24857149394,usec_per_call=1304.08
cmdstat_command:calls=1,usec=546,usec_per_call=546.00
cmdstat_config:calls=4,usec=42,usec_per_call=10.50
cmdstat_zrange:calls=311881,usec=17758756211,usec_per_call=56940.81
cmdstat_lrange:calls=84238,usec=6204684013,usec_per_call=73656.59
cmdstat_info:calls=3,usec=618,usec_per_call=206.00
cmdstat_bgsave:calls=1,usec=48814,usec_per_call=48814.00
cmdstat_multi:calls=19061030,usec=5393238,usec_per_call=0.28
cmdstat_hset:calls=18731519,usec=40855589,usec_per_call=2.18
cmdstat_hsetnx:calls=1176,usec=1936,usec_per_call=1.65
cmdstat_zincrby:calls=10,usec=109,usec_per_call=10.90
cmdstat_exists:calls=84228,usec=186379,usec_per_call=2.21
cmdstat_hincrby:calls=36436402,usec=116822029,usec_per_call=3.21
cmdstat_ping:calls=6,usec=2,usec_per_call=0.33
cmdstat_select:calls=24,usec=5,usec_per_call=0.21
cmdstat_hdel:calls=10,usec=11,usec_per_call=1.10
cmdstat_hgetall:calls=416034,usec=2142105,usec_per_call=5.15
cmdstat_get:calls=1,usec=1,usec_per_call=1.00
cmdstat_client:calls=3,usec=8,usec_per_call=2.67
cmdstat_zadd:calls=54806686,usec=559082513,usec_per_call=10.20
cmdstat_hget:calls=243417,usec=350278,usec_per_call=1.44

# Cluster
cluster_enabled:0

# Keyspace
db0:keys=657,expires=0,avg_ttl=0
db1:keys=533,expires=73,avg_ttl=138730199

Answer 1

I advise you to install the new version - 6.2 ( https://redis.io/download ). Or at least 5.0.14 if it's really important to be with 5.x.
5.0.7 was released over two years ago.