linux-kernel - BUG: writing '0' to queue/rotational causes system hang

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Wed, 03 Jun 2009 14:23:00 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
Subject: BUG: writing '0' to queue/rotational causes system hang

I stumbled into the following bug on an Acer Aspire 1 running moblin2-beta: The
drive misidentifies itself as being 'rotational' even though it's an SSD drive.
drive/model = "SSDPAMM0008G1EA" - the standard 8gb SSD provided with Acer Aspire
one models.

Tuning 'rotational' to '0' at boot time causes the system to hard lock up. We're
attempting to do this tuning early in the boot phase in order to get the right
queueing and possibly improve startup time, so there is a lot of IO going on at
the moment.

Not sure what the real cause it so far. Test case is a simple "echo 0 >
/sys/block/sda/queue/rotational". Doing this at idle time has no effect, so I
suspect a race with the IO scheduler.

Cheers,

Auke

--
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/