Re: [Dnsmasq-discuss] dnsmasq 2.86 crash
Sorry, I forgot the backtrace; here it is:
(gdb) bt
#0 0x561772564d46 in lookup_domain (domain=0x561772b1d7a0
"enterprise.activity.windows.com", flags=flags@entry=128,
lowout=lowout@entry=0x7ffe8a4b63ac, highout=highout@entry=0x7ffe8a4b63b0)
at domain-match.c:234
#1 0x561772532b1e in forward_query (udpfd=5,
udpaddr=udpaddr@entry=0x7ffe8a4b6500, dst_addr=dst_addr@entry=0x7ffe8a4b64e0,
dst_iface=dst_iface@entry=13, header=header@entry=0x561772b1fae0,
plen=plen@entry=49, limit=0x561772b1fce0 "", now=1634091453,
forward=0x0, ad_reqd=0, do_bit=0) at forward.c:258
#2 0x56177253387e in receive_query (listen=listen@entry=0x561772b1f400,
now=now@entry=1634091453) at forward.c:1636
#3 0x561772538b7c in check_dns_listeners (now=now@entry=1634091453) at
dnsmasq.c:1810
#4 0x56177251888b in main (argc=, argv=) at
dnsmasq.c:1237
(gdb)
On Tue, Oct 12, 2021 at 10:55:22PM -0400, Eloy Paris wrote:
> Hello,
>
> I am experiencing crashes in dnsmasq (2.86). I am able to reproduce it
> though I am not sure about the exact sequence of events -- it happens
> when I enable/disable my Ethernet NIC and disable/enable my wireless
> NIC.
>
> In this use case, dnsmasq provides DNS and DHCP for a virtual machine
> (VM) running on KVM. Something like this:
>
>+-- (Ethernet)-+
>| |
> Internet + Hypervisor (virbr0) --- VM
>| |
>+--- (Wi-fi)---+
>
> The interfaces I am enabling and disabling are on the hypervisor
> ("Ethernet" and "Wi-fi" above; virbr0 never goes down).
>
> I guess dnsmasq does not handle gracefully receiving a DNS request from
> the VM when the external interfaces of the hypervisor (Ethernet or
> wi-fi) go down?
>
> Some details below; happy to provide more information if that's not
> enough to get to the bottom of it.
>
> Cheers,
>
> Eloy Paris.-
>
> --
>
> elparis@chapilu[0]:~$ sudo coredumpctl debug dnsmasq
> [sudo] Mot de passe de elparis :
>PID: 46002 (dnsmasq)
>UID: 65534 (nobody)
>GID: 65534 (nobody)
> Signal: 11 (SEGV)
> Timestamp: Tue 2021-10-12 22:17:33 EDT (11min ago)
> Command Line: /usr/bin/dnsmasq
> --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro
> --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
> Executable: /usr/bin/dnsmasq
> Control Group: /system.slice/libvirtd.service
> Unit: libvirtd.service
> Slice: system.slice
>Boot ID: a42fe0fbd18649ad8a6951687e2855d8
> Machine ID: 3d34409507634591951da9abb51a3942
> Hostname: chapilu
>Storage:
> /var/lib/systemd/coredump/core.dnsmasq.65534.a42fe0fbd18649ad8a6951687e2855d8.46002.163409145300.zst
> (present)
> Disk Size: 204.6K
>Message: Process 46002 (dnsmasq) of user 65534 dumped core.
>
> Found module linux-vdso.so.1 with build-id:
> c6d7bcf242640b81aef03f231535fa4c2486c744
> Found module libffi.so.7 with build-id:
> de60e99f39569d11d09160bbdcd486cedc87d2b6
> Found module libp11-kit.so.0 with build-id:
> 5314ec746546ada6f442b6fdfae15eab9f6d3cdc
> Found module libcrypto.so.1.1 with build-id:
> 6d23f0a3f354825868d044684fad31d482cc9210
> Found module libdl.so.2 with build-id:
> 5abc547e7b0949f89f3c0e21ab0c8331a7440a8a
> Found module libcrypt.so.2 with build-id:
> 3743451bdaf36f951f926927633fd964813025d0
> Found module libnss_systemd.so.2 with build-id:
> 22990ff716d182c427e26b7a3cf94048b55b3e75
> Found module libnss_files.so.2 with build-id:
> 1a36dfc01d3a1010b2ee79766a24a8090a3266d5
> Found module libgpg-error.so.0 with build-id:
> ba85170c2d9343ea05eea8fa2048c212ff4ef552
> Found module libgcrypt.so.20 with build-id:
> db45f5d5e0f7af1e77324fea1885f974619ad268
> Found module libcap.so.2 with build-id:
> c1674f9082fedd415876b9f7d9712269163259b5
> Found module liblz4.so.1 with build-id:
> e63600ab23b2f6997f42fac2fa56e1f02ce159a1
> Found module libzstd.so.1 with build-id:
> 4b10444c1560ebc574af4d5f488b7408b22d450e
> Found module liblzma.so.5 with build-id:
> 8b615460aa230708c5183f16bede67aa0437d95e
> Found module librt.so.1 with build-id:
> 75484da2d6f1515189eefa076e0a40328834cd16
> Found module ld-linux-x86-64.so.2 with build-id:
> 040cc3dd10461562f177df39e3be2f3704258c3c
> Found module libmnl.so.0 with build-id:
> fdf3a318247060fa3e451d511ebaf23a7396d1dd
> Found module libnfnetlink.so.0 with build-id:
> 273cc877c7b2ff41e88753edda777d7f1c4017ca
> Found module libunistring.so.2 with build-id:
> 015ac6d6bcb60b7d8bea31a80d1941b06e8636ab
> Found module libsystemd.so.0 with build-id:
>
[Dnsmasq-discuss] dnsmasq 2.86 crash
Hello,
I am experiencing crashes in dnsmasq (2.86). I am able to reproduce it
though I am not sure about the exact sequence of events -- it happens
when I enable/disable my Ethernet NIC and disable/enable my wireless
NIC.
In this use case, dnsmasq provides DNS and DHCP for a virtual machine
(VM) running on KVM. Something like this:
+-- (Ethernet)-+
| |
Internet + Hypervisor (virbr0) --- VM
| |
+--- (Wi-fi)---+
The interfaces I am enabling and disabling are on the hypervisor
("Ethernet" and "Wi-fi" above; virbr0 never goes down).
I guess dnsmasq does not handle gracefully receiving a DNS request from
the VM when the external interfaces of the hypervisor (Ethernet or
wi-fi) go down?
Some details below; happy to provide more information if that's not
enough to get to the bottom of it.
Cheers,
Eloy Paris.-
--
elparis@chapilu[0]:~$ sudo coredumpctl debug dnsmasq
[sudo] Mot de passe de elparis :
PID: 46002 (dnsmasq)
UID: 65534 (nobody)
GID: 65534 (nobody)
Signal: 11 (SEGV)
Timestamp: Tue 2021-10-12 22:17:33 EDT (11min ago)
Command Line: /usr/bin/dnsmasq
--conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro
--dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
Executable: /usr/bin/dnsmasq
Control Group: /system.slice/libvirtd.service
Unit: libvirtd.service
Slice: system.slice
Boot ID: a42fe0fbd18649ad8a6951687e2855d8
Machine ID: 3d34409507634591951da9abb51a3942
Hostname: chapilu
Storage:
/var/lib/systemd/coredump/core.dnsmasq.65534.a42fe0fbd18649ad8a6951687e2855d8.46002.163409145300.zst
(present)
Disk Size: 204.6K
Message: Process 46002 (dnsmasq) of user 65534 dumped core.
Found module linux-vdso.so.1 with build-id:
c6d7bcf242640b81aef03f231535fa4c2486c744
Found module libffi.so.7 with build-id:
de60e99f39569d11d09160bbdcd486cedc87d2b6
Found module libp11-kit.so.0 with build-id:
5314ec746546ada6f442b6fdfae15eab9f6d3cdc
Found module libcrypto.so.1.1 with build-id:
6d23f0a3f354825868d044684fad31d482cc9210
Found module libdl.so.2 with build-id:
5abc547e7b0949f89f3c0e21ab0c8331a7440a8a
Found module libcrypt.so.2 with build-id:
3743451bdaf36f951f926927633fd964813025d0
Found module libnss_systemd.so.2 with build-id:
22990ff716d182c427e26b7a3cf94048b55b3e75
Found module libnss_files.so.2 with build-id:
1a36dfc01d3a1010b2ee79766a24a8090a3266d5
Found module libgpg-error.so.0 with build-id:
ba85170c2d9343ea05eea8fa2048c212ff4ef552
Found module libgcrypt.so.20 with build-id:
db45f5d5e0f7af1e77324fea1885f974619ad268
Found module libcap.so.2 with build-id:
c1674f9082fedd415876b9f7d9712269163259b5
Found module liblz4.so.1 with build-id:
e63600ab23b2f6997f42fac2fa56e1f02ce159a1
Found module libzstd.so.1 with build-id:
4b10444c1560ebc574af4d5f488b7408b22d450e
Found module liblzma.so.5 with build-id:
8b615460aa230708c5183f16bede67aa0437d95e
Found module librt.so.1 with build-id:
75484da2d6f1515189eefa076e0a40328834cd16
Found module ld-linux-x86-64.so.2 with build-id:
040cc3dd10461562f177df39e3be2f3704258c3c
Found module libmnl.so.0 with build-id:
fdf3a318247060fa3e451d511ebaf23a7396d1dd
Found module libnfnetlink.so.0 with build-id:
273cc877c7b2ff41e88753edda777d7f1c4017ca
Found module libunistring.so.2 with build-id:
015ac6d6bcb60b7d8bea31a80d1941b06e8636ab
Found module libsystemd.so.0 with build-id:
f776aaa16b4e2ba7056d01d928e4b2726ffe2b8b
Found module libpthread.so.0 with build-id:
07c8f95b4f3251d08550217ad8a1f31066229996
Found module libc.so.6 with build-id:
4b406737057708c0e4c642345a703c47a61c73dc
Found module libgmp.so.10 with build-id:
e58d34ab389d1b649c24195c2d145e3ff2e58290
Found module libhogweed.so.6 with build-id:
2d70cff7b1841b4d9ca4e8e7726cd4b944c07fdc
Found module libnettle.so.8 with build-id:
9a878e513c02007598fcf1e2e286c2203f13536e
Found module libnetfilter_conntrack.so.3 with build-id:
0ad526380b1a1986a1e471a84d88d5f2a7fedd80
Found module libidn2.so.0 with build-id:
1ce2b50ad9f9821c2c629b521cf5a3c99593d332
Found module libdbus-1.so.3 with build-id:
74f2ab9c60512f3a93c932c3f627564d42e0b11e
Found module dnsmasq with build-id:
17b49d0999133997748526c51d99bf8b932fb79d
Stack trace of thread 46002:
#0 0x561772564d46 lookup_domain (dnsmasq + 0x55d46)
#1 0x561772532b1e forward_query (dnsmasq + 0x23b1e)
Re: [Dnsmasq-discuss] How to Add max-ttl in DNSMASQ
Please report what is on line 56. Following command would print just that: sed -e '56!d' /etc/dnsmasq.conf I doubt that is about max-ttl option. Are you still using RHEL6 (or derivate) for some reason? I thought every option is supported in more recent versions. I would like to know what option were supported in the old but is not in current version. Please Share. Cheers, Petr On 10/11/21 19:41, OMair Siddiquii wrote: > > 1. I stopped DNSMASQ service. > 2. I ran "dnsmasq --max-ttl=30" > 3. Got this error "dnsmasq: bad command line options: try --help" > 4. Tried to manually add max-ttl= in dnsmasq.conf > 5. Got this error "Starting dnsmasq: > dnsmasq: bad option at line 56 of /etc/dnsmasq.conf [FAILED]" > > > > *From:* Dnsmasq-discuss > on behalf of Matus > UHLAR - fantomas via Dnsmasq-discuss > > *Sent:* Monday, October 11, 2021 9:25 PM > *To:* dnsmasq-discuss@lists.thekelleys.org.uk > > *Subject:* Re: [Dnsmasq-discuss] How to Add max-ttl in DNSMASQ > > On 11.10.21 16:01, OMair Siddiquii wrote: > >Even after upgrading to version 2.85 it didn't work. > > what exactly does "didn't work" mean? > does dnsmasq still refuse to start? > do you have any error message? > did you try to stop it before starting? > > -- Petr Menšík Software Engineer Red Hat, http://www.redhat.com/ email: pemen...@redhat.com PGP: DFCF908DB7C87E8E529925BC4931CA5B6C9FC5CB ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] How to provide DHCP for WiFi hotspot?
On Mon, Oct 11, 2021 at 10:59:01PM +0100, Alex Morris wrote: > On Mon, 11 Oct 2021, at 21:22, Chris Green wrote: > > > > Do I just need to add a DHCP range line such as:- > > > > dhcp-range=10.42.0.100,10.42.0.200 > > > > to /etc/dnsmasq.conf to get IP addresses for systems that connect to > > the WiFi hotspot or is there more needed? > > > > Depends what you want the clients to do. > > If you just want the clients to have IP addresses and be able to talk to > each other within the same subnet, then that should suffice. > > If you want the clients to also be able to communicate with other networks, > e.g. the Internet, then you may wish to consider also specifying options > 3 and 6. > Thanks, just what I was after knowing. -- Chris Green ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] How to provide DHCP for WiFi hotspot?
On Mon, Oct 11, 2021 at 10:59:01PM +0100, Alex Morris wrote: > On Mon, 11 Oct 2021, at 21:22, Chris Green wrote: > > > > Do I just need to add a DHCP range line such as:- > > > > dhcp-range=10.42.0.100,10.42.0.200 > > > > to /etc/dnsmasq.conf to get IP addresses for systems that connect to > > the WiFi hotspot or is there more needed? > > > > Depends what you want the clients to do. > > If you just want the clients to have IP addresses and be able to talk > to each other within the same subnet, then that should suffice. > > If you want the clients to also be able to communicate with other > networks, e.g. the Internet, then you may wish to consider also > specifying options 3 and 6. It will original poster get started. And to start is good. > Alex Groeten Geert Stappers -- Silence is hard to parse ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
