Today get a lot of backtrace logs

[NormandoHall]

Maybe under attack the TG API Servers? Here is a very short list of these logs. And from 3 individual servers with different IPs.
Debian 12
TelegramBotApi: 10.0
telegram-bot-api binary runs under "telegram" unprivileged user
Listen only 127.0.0.1 through nginx proxy, and allow only these IPs:

allow 149.154.160.0/20;
allow 91.108.4.0/22;
allow ips from local servers;

Port 8443

Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: -------------------------------
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x1098ec)[0x7ff706ecf8ec]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x891f5)[0x7ff706e4f1f5]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x363e00)[0x5615f37c4e00]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x363eee)[0x5615f37c4eee]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x363eb6)[0x5615f37c4eb6]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x368a23)[0x5615f37c9a23]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x3689c8)[0x5615f37c99c8]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x36860f)[0x5615f37c960f]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x368412)[0x5615f37c9412]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x36683f)[0x5615f37c783f]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x364dbb)[0x5615f37c5dbb]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1b414d)[0x5615f361514d]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x3668f6)[0x5615f37c78f6]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x33449e)[0x5615f379549e]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x20c38c)[0x5615f366d38c]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc++.so.1(_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEaSERKS5_+0xdd)[0x7ff70713c31d]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc++.so.1(_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE21__grow_by_and_replaceEmmmmmmPKc+0x8d)[0x7ff70713a8ad]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc++.so.1(+0x41fe0)[0x7ff707121fe0]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x3c050)[0x7ff706e02050]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1b02b9)[0x5615f36112b9]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x14e5719)[0x5615f4946719]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: ------- Stack Backtrace -------
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: -------------------------------
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1abbd1)[0x5615f360cbd1]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85)[0x7ff706ded305]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x2724a)[0x7ff706ded24a]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1ae94a)[0x5615f360f94a]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x36326f)[0x5615f37c426f]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x368ab3)[0x5615f37c9ab3]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x14e81f2)[0x5615f49491f2]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(epoll_wait+0x56)[0x7ff706ecef36]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x3c050)[0x7ff706e02050]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1b02b9)[0x5615f36112b9]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x14e5719)[0x5615f4946719]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: ------- Stack Backtrace -------
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: -------------------------------
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1abbd1)[0x5615f360cbd1]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85)[0x7ff706ded305]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x2724a)[0x7ff706ded24a]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1ae94a)[0x5615f360f94a]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x36326f)[0x5615f37c426f]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x368ab3)[0x5615f37c9ab3]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x14e81f2)[0x5615f49491f2]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(epoll_wait+0x56)[0x7ff706ecef36]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x3c050)[0x7ff706e02050]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1b02b9)[0x5615f36112b9]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x14e5719)[0x5615f4946719]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: ------- Stack Backtrace -------
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: -------------------------------
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1abbd1)[0x5615f360cbd1]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85)[0x7ff706ded305]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x2724a)[0x7ff706ded24a]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1ae94a)[0x5615f360f94a]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x36326f)[0x5615f37c426f]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x368ab3)[0x5615f37c9ab3]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x14e81f2)[0x5615f49491f2]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(epoll_wait+0x56)[0x7ff706ecef36]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x3c050)[0x7ff706e02050]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1b02b9)[0x5615f36112b9]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x14e5719)[0x5615f4946719]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: ------- Stack Backtrace -------
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: -------------------------------
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x1098ec)[0x7ff706ecf8ec]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x891f5)[0x7ff706e4f1f5]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x363e00)[0x5615f37c4e00]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x363eee)[0x5615f37c4eee]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x363eb6)[0x5615f37c4eb6]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x368a23)[0x5615f37c9a23]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x3689c8)[0x5615f37c99c8]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x36860f)[0x5615f37c960f]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x368412)[0x5615f37c9412]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x36683f)[0x5615f37c783f]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x364dbb)[0x5615f37c5dbb]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1b414d)[0x5615f361514d]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x3668f6)[0x5615f37c78f6]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x33449e)[0x5615f379549e]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x20c38c)[0x5615f366d38c]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc++.so.1(_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEaSERKS5_+0xdd)[0x7ff70713c31d]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc++.so.1(_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE21__grow_by_and_replaceEmmmmmmPKc+0x8d)[0x7ff70713a8ad]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc++.so.1(+0x41fe0)[0x7ff707121fe0]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x3c050)[0x7ff706e02050]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1b02b9)[0x5615f36112b9]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x14e5719)[0x5615f4946719]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: ------- Stack Backtrace -------
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: -------------------------------
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1abbd1)[0x5615f360cbd1]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85)[0x7ff706ded305]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x2724a)[0x7ff706ded24a]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1ae94a)[0x5615f360f94a]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x36326f)[0x5615f37c426f]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x368ab3)[0x5615f37c9ab3]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x14e81f2)[0x5615f49491f2]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(epoll_wait+0x56)[0x7ff706ecef36]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /lib/x86_64-linux-gnu/libc.so.6(+0x3c050)[0x7ff706e02050]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x1b02b9)[0x5615f36112b9]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: /usr/local/bin/telegram-bot-api(+0x14e5719)[0x5615f4946719]
Jul 14 20:35:39 vm-produccion telegram-bot-api[774]: ------- Stack Backtrace -------

[levlam]

Likely, someone sent signal SIGRTMIN + 2 to the Telegram Bot API process.

[NormandoHall]

So, why? I was updated to 10.2 and still get these backtraces, specially when CPU cores are heavy used. This is my service file:

[Unit]
Description=Telegram API Server
After=syslog.target network.target
# LÍMITE: Si falla más de 5 veces en un intervalo de 5 minutos (300s), detén el servicio por completo
StartLimitIntervalSec=300
StartLimitBurst=5

[Service]
User=telegram
Group=telegram
Type=simple

Environment=TELEGRAM_API_ID=xxxxxx
Environment=TELEGRAM_API_HASH=xxxxxxxxxxxxxxxx
WorkingDirectory=/opt/telegram

# === PRIORIDAD DE CPU ===
# Le decimos al kernel que este proceso tiene prioridad alta (-5)
Nice=-5

ExecStart=/usr/local/bin/telegram-bot-api -p 63000 -d workdir -t temp --local --http-ip-address=127.0.0.1 --max-webhook-connections=100 --log=/var/log/telegram/server.log --log-max-file-size=50000000
#ExecStart=/usr/local/bin/telegram-bot-api -p 63000 -d workdir -t temp --http-ip-address=127.0.0.1
ExecStop=/bin/kill -15 $MAINPID
ExecReload=/bin/kill -s HUP $MAINPID

# === SECCIÓN DE SEGURIDAD Y CONTROL DE DAÑOS ===
# Intentar reiniciar solo si el proceso falla de forma inesperada (no con cierres limpios)
Restart=on-failure
# Esperar 5 segundos antes de intentar reiniciar
RestartSec=5s

# Opcional: Limitar la cantidad de memoria que este servicio puede usar para que nunca congele el sistema
MemoryMax=1G
MemoryHigh=512M

[Install]
WantedBy=multi-user.target