netdev - Re: kmem_cache_alloc panic in 3.10+

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 30 Jan 2014 19:46:15 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	dormando <dormando@...ia.net>, netdev@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alexei Starovoitov <ast@...mgrid.com>
Subject: Re: kmem_cache_alloc panic in 3.10+

On Thu, Jan 30, 2014 at 6:16 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Wed, 2014-01-29 at 23:05 -0800, dormando wrote:
>
>> We hit the routing code fairly hard. Any hints for what to look at or how
>> to instrument it? Or if it's fixed already? It's a real pain to iterate
>> since it takes ~30 days to crash, usually. Sometimes.

sounds like adding mdelay() didn't help to crash it sooner. Then I don't
see how my dst fix was causing it to crash more often. Something odd.
fyi just to check it more thoroughly I've been running with mdelay()
and config_slub_debug_on for a week without issues.

> I really wonder... it looks like a possible in SLUB. (might be already
> fixed)
>
> Could you try using SLAB instead ?

try config_slub_debug_on=y ? it should catch double free and other things.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html