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  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Sat, 05 Dec 2015 22:48:29 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	eric.dumazet@...il.com, phil@....cc, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, tgraf@...g.ch,
	fengguang.wu@...el.com, wfg@...ux.intel.com, lkp@...org
Subject: Re: rhashtable: Use __vmalloc with GFP_ATOMIC for table allocation

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Sat, 5 Dec 2015 15:03:54 +0800

> Sorry Dave but you'll have to revert this because I've been able
> to trigger the following crash with the patch:
> 
> Testing concurrent rhashtable access from 50 threads
> ------------[ cut here ]------------
> kernel BUG at ../mm/vmalloc.c:1337!
> invalid opcode: 0000 [#1] PREEMPT SMP 
> 
> The reason is that because I was testing insertions with BH disabled,
> and __vmalloc doesn't like that, even with GFP_ATOMIC.  As we
> obviously want to continue to support rhashtable users inserting
> entries with BH disabled, we'll have to look for an alternate
> solution.

Ok, reverted, thanks for the heads up.
--
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

Powered by blists - more mailing lists