[nsd-users] NSD 4.2.0 intermittent segfaults @ libssl ?

[A. Schulze]

Am 12.06.19 um 08:16 schrieb Wouter Wijngaards:
> Hi,
> 
> On 11/06/2019 22:22, PGNet Dev wrote:
>> On 6/11/19 11:59 AM, A. Schulze wrote:
>>> Am 11.06.19 um 19:54 schrieb A. Schulze:
>>>>   - I don't use TLS for AXFR
>>> if that matters: I *do* use TSIG-Keys to secure the AXFR
>>
>> Here, all the slave AXFRs are configured NOKEY.
> 
> So it is not SSL.  Then it could be TCP Fast Open (server-side fast
> open, from the logs I see this is the AXFR server).  Or perhaps the file
> descriptor events could be mangled, in the event handling.  This patch
> may help?  Otherwise, perhaps a stack trace of the issue could be useful
> to have, or a way to reproduce it.
> 
> https://github.com/NLnetLabs/nsd/commit/75c7e1a2fab265e504e8aa2f93dff195dc5b8394

I applied similiar changes to 4.2.0 but this make things worse. 
https://andreasschulze.de/tmp/axfr_segfault_fix.patch

Jun 12 17:48:57 dnsserver02 kernel: [2448848.071188] show_signal_msg: 7871 callbacks suppressed
Jun 12 17:48:57 dnsserver02 kernel: [2448848.071191] nsd[59588]: segfault at 4 ip 00007f09e0d92ba3 sp 00007ffe460a0978 error 6 in libev.so.4.0.0[7f09e0d89000+d000]
Jun 12 17:48:57 dnsserver02 kernel: [2448848.071684] nsd[59589]: segfault at 4 ip 00007f09e0d92ba3 sp 00007ffe460a0978 error 6 in libev.so.4.0.0[7f09e0d89000+d000]
Jun 12 17:48:57 dnsserver02 kernel: [2448848.072179] nsd[59590]: segfault at 4 ip 00007f09e0d92ba3 sp 00007ffe460a0978 error 6 in libev.so.4.0.0[7f09e0d89000+d000]
Jun 12 17:48:57 dnsserver02 kernel: [2448848.072672] nsd[59591]: segfault at 4 ip 00007f09e0d92ba3 sp 00007ffe460a0978 error 6 in libev.so.4.0.0[7f09e0d89000+d000]
Jun 12 17:48:57 dnsserver02 kernel: [2448848.073452] nsd[59592]: segfault at 4 ip 00007f09e0d92ba3 sp 00007ffe460a0978 error 6 in libev.so.4.0.0[7f09e0d89000+d000]
Jun 12 17:48:57 dnsserver02 kernel: [2448848.073972] nsd[59593]: segfault at 4 ip 00007f09e0d92ba3 sp 00007ffe460a0978 error 6 in libev.so.4.0.0[7f09e0d89000+d000]
Jun 12 17:48:57 dnsserver02 kernel: [2448848.075735] nsd[59594]: segfault at 4 ip 00007f09e0d92ba3 sp 00007ffe460a0978 error 6 in libev.so.4.0.0[7f09e0d89000+d000]
Jun 12 17:48:57 dnsserver02 kernel: [2448848.076253] nsd[59595]: segfault at 4 ip 00007f09e0d92ba3 sp 00007ffe460a0978 error 6 in libev.so.4.0.0[7f09e0d89000+d000]
Jun 12 17:48:57 dnsserver02 kernel: [2448848.077077] nsd[59596]: segfault at 4 ip 00007f09e0d92ba3 sp 00007ffe460a0978 error 6 in libev.so.4.0.0[7f09e0d89000+d000]
Jun 12 17:48:57 dnsserver02 kernel: [2448848.077576] nsd[59597]: segfault at 4 ip 00007f09e0d92ba3 sp 00007ffe460a0978 error 6 in libev.so.4.0.0[7f09e0d89000+d000]


Andreas