[Bug 1424] New: v0.9.0: segfault when using nft -f <file> and issuing "ruleset flush" twice

[bugzilla-daemon at netfilter.org]

https://bugzilla.netfilter.org/show_bug.cgi?id=1424

            Bug ID: 1424
           Summary: v0.9.0: segfault when using nft -f <file> and issuing
                    "ruleset flush" twice
           Product: nftables
           Version: unspecified
          Hardware: All
                OS: Debian GNU/Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: nft
          Assignee: pablo at netfilter.org
          Reporter: eexexiexit at riseup.net

Created attachment 591
  --> https://bugzilla.netfilter.org/attachment.cgi?id=591&action=edit
strace output of the script that segfaults

Disclaimer: I am totally new to nftable, so forbid my stupidity.

Running this file segfaults on two of my machines (both debian stable
"buster"):

/tmp/test:

#!/usr/sbin/nft -f
flush ruleset
create table inet fw
list table inet fw
flush ruleset

the same command sequence runs smoothly when issued interactively.

kernel message:

[ 8841.187933] show_signal_msg: 12 callbacks suppressed
[ 8841.187936] test[17806]: segfault at 10 ip 00007f175a76929b sp
00007ffc67e5c940 error 4 in libnftables.so.0.0.0[7f175a763000+47000]
[ 8841.190580] Code: ff 48 8b 44 24 28 64 48 33 04 25 28 00 00 00 75 06 48 83
c4 30 5b c3 e8 53 a9 ff ff 0f 1f 00 41 56 41 55 41 54 49 89 fc 55 53 <8b> 7f 10
48 89 f3 e8 2a be ff ff 49 8b 4c 24 40 48 8d 35 e9 0f 04
Segmentation fault

uname -a:

Linux something 4.19.0-5-amd64 #1 SMP Debian 4.19.37-5+deb10u2 (2019-08-08)
x86_64 GNU/Linux

Linux otherthing 4.19.0-8-686-pae #1 SMP Debian 4.19.98-1 (2020-01-26) i686
GNU/Linux

/usr/sbin/nft --version:
nftables v0.9.0 (Fearless Fosdick)

strace is attached.

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