.
Thread 1 (LWP 879):
#0  0x00007f2b2265b227 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55
        resultvar = 0
        pid = 879
        selftid = 879
#1  0x00007f2b2265ce8a in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x7f2b23655721, sa_sigaction = 0x7f2b23655721}, sa_mask = {__val = {139823238245006, 140720708546624, 1457023630, 94725257099168, 39, 0, 18446744073709551615, 18446744073709551615, 139823253980689, 94725257099168, 0, 94725257088431, 140720708546544, 201863462922, 12884901906, 139823241147968}}, sa_flags = 577326374, sa_restorer = 0x7f2b229eb820 <stderr>}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00005626efec0b09 in assertion_failed (file=<optimized out>, line=<optimized out>, type=<optimized out>, cond=<optimized out>) at ../../../bin/named/main.c:232
        tracebuf = {0x5626f14cad50, 0x7f2b22726de2 <__syslog_chk+130>, 0x0, 0x3000000030, 0x7ffc17d87158, 0x7ffc17d87060, 0x400000000, 0x0, 0x0, 0x7f2b23654262, 0x7f2b23654262, 0x7f2b23654262, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0xffffffff, 0x0, 0x0, 0x7f2b229e9600 <_IO_strn_jumps>, 0x0, 0x0, 0xff0000000000, 0x0, 0x3535353535353535, 0x3535353535353535, 0x30300061616161, 0x7f2b2361f550 <isc_log_doit+208>, 0x7f2b246df200 <dns_modules+416>, 0x7f2b2361fc89 <isc_log_doit+2057>, 0x7f2b23654262, 0x7f2b23654262, 0x7f2b23654262, 0x7f2b23654262, 0x7f2b23654262, 0x7f2b23654262, 0x5626f14cadb0, 0x7f2b2361f645 <isc_log_doit+453>, 0x5626f011fe80 <modules>, 0xfffffffebebebebe, 0x7f2b2386c110 <isc_categories+16>, 0x5626eff03b6b, 0x562600000000, 0x7ffc17d87310, 0x7ffc17d873e0, 0x7ffc17d871f0, 0x5626f14cad80, 0x2, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7f2b22723146 <__GI___sbrk+54>, 0x22000, 0x7f2b229eac00 <main_arena>, 0x2270, 0x7f2b2363d774 <handle_signal+196>, 0x24446505853, 0x3, 0x240, 0x0, 0x0, 0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7f2b229eac10 <main_arena+16>, 0x7f2b229eac50 <main_arena+80>, 0x7ffc17d872c0, 0xffff8003e8278d41, 0x7ffc17d872bf, 0x0, 0x0, 0x7c00000077, 0x20, 0x7f2b23626ff9 <isc___mem_get+809>, 0xffff8003e8278cf1, 0x7ffc17d8730f, 0x20, 0x5000000082, 0x4, 0x5626f1511e50, 0x371b0, 0x5626f1512d40, 0x7f2b229eac00 <main_arena>, 0x7f2b244a3f7b, 0x36200, 0x226a6fd8, 0x20000, 0x122e1db956e68500, 0x7f2b2386cb00 <createlock+32>, 0x24aa0288, 0x5626f01283e8 <dlz_dlopen>, 0x7f2b2386c100 <isc_categories>, 0x5626f0126c88 <ns_g_mctx>, 0x562600000001, 0x5626f0126c50 <ns_g_socketmgr>, 0x7f2b23620292 <isc_log_write+146>, 0x0, 0x122e1db900000001, 0x7f2b24486b2c, 0x5626f0126c28 <ns_g_lctx>, 0x5626f0126c18 <ns_g_modules>, 0x7f2b2386c100 <isc_categories>, 0x5626f0126c88 <ns_g_mctx>, 0x5626f14cad50, 0x5626f14bce40, 0x2070, 0x2070, 0x7f2b23655597, 0x5626f0126c50 <ns_g_socketmgr>, 0x7f2b226aa95c <__GI___libc_free+76>, 0x3000000028, 0x7ffc17d874c0, 0x7ffc17d87400, 0x7f2b23628611 <isc___mem_put+1137>, 0x5626f0126c88 <ns_g_mctx>, 0x5626f14cad50, 0x5626f14bce40, 0x2070, 0x2070, 0x7f2b23627d53 <isc___mem_putanddetach+995>}
        i = <optimized out>
        nframes = 0
        result = <optimized out>
        logsuffix = <optimized out>
        fname = 0x7f2b23654262 ""
#3  0x00007f2b2361248a in isc_assertion_failed (file=file@entry=0x7f2b23655798 "../../../lib/isc/mem.c", line=line@entry=1229, type=type@entry=isc_assertiontype_require, cond=cond@entry=0x7f2b236558bc "ctx->references == 1") at ../../../lib/isc/assertions.c:58
No locals.
#4  0x00007f2b23622d42 in isc__mem_destroy (ctxp=0x5626f0126c88 <ns_g_mctx>) at ../../../lib/isc/mem.c:1229
        ctx = 0x5626f14bce40
#5  0x00007f2b23626735 in isc_mem_destroy (mctxp=0x5626f0126c88 <ns_g_mctx>) at ../../../lib/isc/mem.c:2770
No locals.
#6  0x00005626efeaf02f in main (argc=<optimized out>, argv=<optimized out>) at ../../../bin/named/main.c:1349
        result = <optimized out>