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Segmentation fault in stats.c:404 · Issue #782 · NLnetLabs/unbound · GitHub
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Description
Describe the bug
Hello ✋
After this commit 57230d7 my unbound installation began to fall with Segmentation fault. After debug with gdb i get place with segfault
Thread` 1 "unbound" received signal SIGSEGV, Segmentation fault.
server_stats_obtain (worker=worker@entry=0x409bf2f4800, who=0x40828008000, s=s@entry=0x7fffffffc778, reset=reset@entry=0)
at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/daemon/stats.c:404
(gdb) bt
#0 server_stats_obtain (worker=worker@entry=0x409bf2f4800, who=0x40828008000, s=s@entry=0x7fffffffc778, reset=reset@entry=0)
at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/daemon/stats.c:404
#1 0x0000000002197642 in do_stats (ssl=0x7fffffffdc50, worker=0x0, reset=0) at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/daemon/remote.c:1116
#2 0x00000000021965ac in execute_cmd (rc=rc@entry=0x409bee82b80, ssl=0x0, ssl@entry=0x7fffffffdc50, cmd=cmd@entry=0x7fffffffdc70 " stats_noreset", worker=0x7fffffffb198)
at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/daemon/remote.c:3080
#3 0x0000000002196016 in handle_req (rc=0x409bee82b80, res=0x7fffffffdc50, s=<optimized out>)
at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/daemon/remote.c:3323
#4 remote_control_callback (c=<optimized out>, arg=0x552091994430, err=<optimized out>, rep=<optimized out>)
at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/daemon/remote.c:3409
#5 0x000000000223654e in event_persist_closure (base=0x409bf268e80, ev=0x55208f57e600) at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/libs/libevent/event.c:1623
#6 event_process_active_single_queue (base=0x409bf268e80, activeq=0x409bfc79210, max_to_process=max_to_process@entry=2147483647, endtime=endtime@entry=0x0)
at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/libs/libevent/event.c:1682
#7 0x000000000223323c in event_process_active (base=0x409bf268e80) at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/libs/libevent/event.c:1783
#8 event_base_loop (base=0x409bf268e80, flags=flags@entry=0) at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/libs/libevent/event.c:2006
#9 0x0000000002232c07 in event_base_dispatch (event_base=0x0) at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/libs/libevent/event.c:1817
#10 0x00000000021a4ed5 in ub_event_base_dispatch (base=0x0) at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/util/ub_event.c:280
#11 0x0000000002f8115c in comm_base_dispatch (b=<optimized out>) at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/util/netevent.c:267
#12 0x00000000021a3e59 in worker_work (worker=<optimized out>) at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/daemon/worker.c:2320
#13 0x0000000002194ace in daemon_fork (daemon=daemon@entry=0x409bf340000) at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/daemon/daemon.c:773
#14 0x000000000219f018 in run_daemon (cfgfile=<optimized out>, cmdline_verbose=0, debug_mode=1, need_pidfile=1)
at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/daemon/unbound.c:743
#15 main (argc=<optimized out>, argv=<optimized out>) at /place/sandbox-data/tasks/8/0/1507276808/__FUSE/mount_path_8ea5aeab-ca51-4dae-91ec-8299322eef4d/contrib/tools/unbound/daemon/unbound.c:845
I caught problem with new function which uses select for wait responce from socket. I read that this method has limit on how many description may have been selected and one more limit that method(FD_SET structure) can't work with fd description which has num more 1024 (it's something historicaly, i don't know why). And on my installation i have this problem. I wrote simple function on poll:
#include "sys/poll.h"
int tube_wait_timeout_poll(struct tube* tube, int msec) {
struct pollfd fds;
fds.fd = tube->sr;
fds.events = POLLIN;
int ret = poll( &fds, 1, msec );
if ( ret == -1 )
return -1;
else if ( ret == 0 )
return 0;
fds.revents = 0;
return ret;
}
and changed old function in this line on new function.
And it's working fine for me. I haven't expirence and testing with Windows for change this place and therefore it's not PR
To reproduce
Steps to reproduce the behavior:
- in unbound.conf
- set
interface:multiple time on different ip (i have 7) - set
num-threads:in something big (i set 64)
- start unbound and within a minute it restarting with segfailt in dmesg
System:
- Unbound version: 1.17.0
- OS: Ubuntu 18.04.3 LTS
unbound -Voutput:
Version 1.17.0-UNBOUNDREL-8-select-to-poll-r10337037
Configure line: --disable-static --prefix=/var/empty/unbound-1.17.0 --bindir=/var/empty/tmp/out/bin --sbindir=/var/empty/tmp/out/sbin --includedir=/var/empty/tmp/out/include --oldincludedir=/var/empty/tmp/out/include --mandir=/var/empty/tmp/out/share/man --infodir=/var/empty/tmp/out/share/info --docdir=/var/empty/tmp/out/share/doc/unbound --libdir=/var/empty/tmp/out/lib --libexecdir=/var/empty/tmp/out/libexec --localedir=/var/empty/tmp/out/share/locale --disable-rpath --enable-dnstap --enable-dnscrypt --enable-subnet --enable-systemd --libdir=/usr/lib --prefix= --with-libevent=/var/empty/libevent-2.1.12-dev --with-pidfile=/run/unbound.pid --with-rootkey-file=/var/lib/unbound/root.key --with-ssl=/var/empty/openssl-1.1.1o-dev --with-username= --with-libnghttp2=/var/empty/nghttp2-1.47.0-dev
Linked libs: libevent 2.1.12-stable (it uses epoll), OpenSSL 1.1.1l 24 Aug 2021
Linked modules: dns64 subnetcache respip validator iterator
DNSCrypt feature available
BSD licensed, see LICENSE in source package for details.
Report bugs to unbound-bugs@nlnetlabs.nl or https://github.com/NLnetLabs/unbound/issues
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