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Last active March 23, 2019 14:41
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backtrace
#0 yaSSL::SSL::GetError (this=this@entry=0x56295bf4df70)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/extra/yassl/src/yassl_int.cpp:1520
#1 0x00007f48640aa5db in yaSSL::receiveData (ssl=..., data=...,
peek=peek@entry=false)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/extra/yassl/src/handshake.cpp:1047
#2 0x00007f48640901ed in yaSSL::yaSSL_read (ssl=ssl@entry=0x56295bf4df70,
buffer=buffer@entry=0x56295bf500f0, sz=sz@entry=4)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/extra/yassl/src/ssl.cpp:363
#3 0x00007f4864069987 in vio_ssl_read (vio=0x56295bf49590,
buf=0x56295bf500f0 "r", size=<optimized out>)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/vio/viossl.c:186
#4 0x00007f4864042d8e in net_read_raw_loop (count=4, net=0x56295bf4d0a0)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql/net_serv.cc:672
#5 net_read_packet_header (net=0x56295bf4d0a0)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql/net_serv.cc:762
#6 net_read_packet (net=0x56295bf4d0a0, complen=0x7fff3bfc7760)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql/net_serv.cc:822
#7 0x00007f4864043e0c in my_net_read (net=net@entry=0x56295bf4d0a0)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql/net_serv.cc:899
#8 0x00007f486403809c in cli_safe_read_with_ok (
mysql=mysql@entry=0x56295bf4d0a0, parse_ok=parse_ok@entry=0 '\000',
is_data_packet=is_data_packet@entry=0x0)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql-common/client.c:1061
#9 0x00007f486403834f in cli_safe_read (mysql=mysql@entry=0x56295bf4d0a0,
is_data_packet=is_data_packet@entry=0x0)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql-common/client.c:1194
#10 0x00007f4864039168 in cli_read_query_result (mysql=0x56295bf4d0a0)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql-common/client.c:5245
#11 0x00007f486403af31 in mysql_real_query (mysql=mysql@entry=0x56295bf4d0a0,
query=query@entry=0x7fff3bfc78a0 "SELECT id,origin,ns,mbox,serial,refresh,retry,expire,minimum,ttl FROM soa WHERE origin='foo.example.com.'",
length=<optimized out>)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql-common/client.c:5341
#12 0x000056295ac210d9 in sql_query (sqlConn=sqlConn@entry=0x56295bf4d0a0,
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql/net_serv.cc:822
#7 0x00007f4864043e0c in my_net_read (net=net@entry=0x56295bf4d0a0)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql/net_serv.cc:899
#8 0x00007f486403809c in cli_safe_read_with_ok (
mysql=mysql@entry=0x56295bf4d0a0, parse_ok=parse_ok@entry=0 '\000',
is_data_packet=is_data_packet@entry=0x0)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql-common/client.c:1061
#9 0x00007f486403834f in cli_safe_read (mysql=mysql@entry=0x56295bf4d0a0,
is_data_packet=is_data_packet@entry=0x0)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql-common/client.c:1194
#10 0x00007f4864039168 in cli_read_query_result (mysql=0x56295bf4d0a0)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql-common/client.c:5245
#11 0x00007f486403af31 in mysql_real_query (mysql=mysql@entry=0x56295bf4d0a0,
query=query@entry=0x7fff3bfc78a0 "SELECT id,origin,ns,mbox,serial,refresh,retry,expire,minimum,ttl FROM soa WHERE origin='foo.example.com.'",
length=<optimized out>)
at /export/home/pb2/build/sb_0-32013917-1545389775.79/release/mysql-5.7.25/sql-common/client.c:5341
#12 0x000056295ac210d9 in sql_query (sqlConn=sqlConn@entry=0x56295bf4d0a0,
---Type <return> to continue, or q <return> to quit---
query=query@entry=0x7fff3bfc78a0 "SELECT id,origin,ns,mbox,serial,refresh,retry,expire,minimum,ttl FROM soa WHERE origin='foo.example.com.'",
querylen=<optimized out>) at sql.c:332
#13 0x000056295ac209f7 in mydns_soa_load (sqlConn=0x56295bf4d0a0,
rptr=rptr@entry=0x7fff3bfc7b38,
origin=origin@entry=0x56295bf97900 "foo.example.com.") at soa.c:270
#14 0x000056295ac0bbc8 in zone_cache_find (t=t@entry=0x56295bf97880,
zone=zone@entry=0, origin=origin@entry=0x0, type=type@entry=DNS_QTYPE_SOA,
name=name@entry=0x56295bf97900 "foo.example.com.",
namelen=namelen@entry=24, errflag=0x7fff3bfc7bb4, parent=0x0)
at cache.c:596
#15 0x000056295ac0de1d in find_soa (t=t@entry=0x56295bf97880,
fqdn=fqdn@entry=0x56295bf97900 "foo.example.com.",
label=label@entry=0x7fff3bfc7c50 "") at data.c:56
#16 0x000056295ac164ca in resolve (t=t@entry=0x56295bf97880,
section=section@entry=ANSWER, qtype=DNS_QTYPE_A,
fqdn=fqdn@entry=0x56295bf97900 "foo.example.com.",
level=level@entry=0) at resolve.c:432
#17 0x000056295ac1a096 in task_process (t=0x56295bf97880) at task.c:541
#18 0x000056295ac098d8 in main (argc=<optimized out>, argv=<optimized out>)
at main.c:886
Raw
infinite-loop.c
/* -*- mode: c; coding: utf-8 -*-
How to reproduce
gcc infinite-loop.c $(mysql_config --cflags) $(mysql_config --libs) -o infinite-loop
MYSQL_USER=scott MYSQL_PWD=tiger ./infinite-loop
mysql client version: 50725
> safe_sleep: 20
caught signal: 10
> do_query
(entering an infinite loop)
^C
mysql client version: 50620
> safe_sleep: 20
caught signal: 10
> do_query
query: Lost connection to MySQL server during query
(not entering an infinite loop)
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#include <mysql.h>
void signal_handler(int signum) {
fprintf(stderr, "caught signal: %d\n", signum);
}
void do_query(MYSQL mysql) {
int r;
MYSQL_RES *result;
MYSQL_ROW row;
fprintf(stderr, "> do_query\n");
char *stmt = "select 1";
unsigned int stmt_len = strlen(stmt);
r = mysql_real_query(&mysql, stmt, stmt_len);
if (r != 0) {
fprintf(stderr, "query: %s\n", mysql_error(&mysql));
exit(1);
}
result = mysql_store_result(&mysql);
while ((row = mysql_fetch_row(result))) {
printf("< %s\n", row[0]);
}
mysql_free_result(result);
}
void safe_sleep(time_t sec) {
int r;
struct timespec req, rem;
fprintf(stderr, "> safe_sleep: %ld\n", sec);
req.tv_sec = sec;
req.tv_nsec = 0;
for (;;) {
r = nanosleep(&req, &rem);
if (r == 0) {
break;
} else {
req.tv_sec = rem.tv_sec;
req.tv_nsec = rem.tv_nsec;
}
}
}
int main(int argc, char** argv) {
int r;
char *host = getenv("MYSQL_HOST");
char *user = getenv("MYSQL_USER");
char *password = getenv("MYSQL_PWD");
MYSQL mysql;
struct sigaction sa;
if (host == NULL)
host = "127.0.0.1";
if (user == NULL)
user = "root";
memset(&sa, 0, sizeof(sa));
sa.sa_handler = signal_handler;
if (sigaction(SIGTERM, &sa, NULL) != 0) {
perror("sigaction");
exit(1);
}
if (sigaction(SIGALRM, &sa, NULL) != 0) {
perror("sigaction");
exit(1);
}
if (sigaction(SIGUSR1, &sa, NULL) != 0) {
perror("sigaction");
exit(1);
}
fprintf(stderr, "mysql client version: %ld\n", mysql_get_client_version());
mysql_init(&mysql);
// disable reconnection
my_bool reconnect = 0;
mysql_options(&mysql, MYSQL_OPT_RECONNECT, &reconnect);
if (!mysql_real_connect(&mysql, host, user, password, "", 3306, NULL, 0)) {
fprintf(stderr, "connect: %s\n", mysql_error(&mysql));
exit(1);
}
// must be greater than `wait-timeout`
int sleep_second = 20;
for (;;) {
if (fork() == 0) {
// char *signal = "-TERM";
// char *signal = "-ALRM";
char *signal = "-USR1";
char p_pid[12];
sprintf(p_pid, "%d", getppid());
sleep(3);
execl("/bin/kill", "/bin/kill", signal, p_pid, (char *)NULL);
perror("failed to exec");
exit(1);
}
safe_sleep(sleep_second);
sleep_second += 10;
do_query(mysql);
}
mysql_close(&mysql);
return 0;
}
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