On Wed, 29 May 2019, Bill Cole wrote:
On 28 May 2019, at 4:31, Stoiko Ivanov wrote:
Hello,
with a recent update to the ruleset, we're encountering certain mails,
which cause the rule-evaluation to use 100% cpu.
The effect was reproduced with Proxmox Mailgateway 5.2 (running
Spamassassin 3.4.2 ) and Ubuntu 19.04 (also running Spamassassin 3.4.2)
I have reproduced this on CentOS 7 with the stock Perl 5.16 and manually
installed 5.18 and 5.28 builds. SA hangs while evaluating the rule and
eventually times out.
On stock fully-updated CentOS 6 the hang is worse: apparently perl gets stuck
inside a syscall and it ignores the alarm signal for the timeout, hanging the
process indefinitely.
Further muddying the issue, on Mac OS X 10.6.8 with Perl 5.26 (MacPorts local
build) the hang simply does not happen.
After some debugging the issue was narrowed down to the rule
__STYLE_GIBBERISH_1 .
Confirmed: switching to the simpler version of that rule which is used for
older versions of Perl eliminates the hang. I suspect that the ultimate fix
may be to just back off to the version of the rule that is already used for
older Perl.
The reason for that last change was that version also has runaway runtime
problems on certain gibberish styles. Reverting would be substituting one
failure mode for another.
I am working on it now. I have a partial fix already.
--
John Hardin KA7OHZ http://www.impsec.org/~jhardin/
jhar...@impsec.org FALaholic #11174 pgpk -a jhar...@impsec.org
key: 0xB8732E79 -- 2D8C 34F4 6411 F507 136C AF76 D822 E6E6 B873 2E79
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