linux-kernel - Re: Odd NFS related SIGBUS (& possible fix)

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:	Fri, 01 Oct 2010 16:01:30 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Nick Piggin <npiggin@...nel.dk>
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: Odd NFS related SIGBUS (& possible fix)

On Fri, 2010-10-01 at 15:57 +1000, Benjamin Herrenschmidt wrote:

> I actually just reproduced the lockup on x86_64 with 4 CPUs using
> mmapstress01 -p 5 -t 1.3 -f 4096.
> 
> So the trick is to mount /tmp over nfs (so that the mmap'ed file ends up
> on nfs) and run mmapstress01 as above. Then try ctrl-C it.
> 
> I'll do a bz for that one.
> 
> I'm now going to try going back kernel versions to see if I can also
> reproduce the SIGBUS or other timing issues.

So on x86 I didn't get a backtrace, but the VGA console was still
responsive somewhat, and I saw mmapstress01 there using 100% CPU and
unresponsive to kill -9 (stays in state R).

Cheers,
Ben.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/