linux-kernel - Re: reading errors on JMicron JM20337 USB-SATA

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

Date:	Mon, 3 Aug 2009 11:19:33 +0400 (MSD)
From:	"Lev A. Melnikovsky" <melnikovsky@...l.ru>
To:	Artur Skawina <art.08.09@...il.com>
cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org
Subject: Re: reading errors on JMicron JM20337 USB-SATA

  On Sun, 2 Aug 2009 at 6:03pm, Artur Skawina wrote:

AS> Lev A. Melnikovsky wrote:
AS> > I have read through a year old thread on "JMicron JM20337 USB-SATA data
AS> > corruption bugfix" and it seems here's another aspect of the same
AS> > problem. The SATA disk has genuine errors (bad sectors, just in case: I
AS> > am not going to use it but to recover some data from it). Unfortunately
AS> > when a bad block is read no error is returned, instead a caller is
AS> > blocked indefinitely (until the USB cable is removed). The system log is
AS> > filled with repetitive
AS> > 
AS> > sd 3:0:0:0: [sdf] Sense Key : 0x0 [current]
AS> > sd 3:0:0:0: [sdf] ASC=0x0 ASCQ=0x0
AS> 
AS> yes, jmicron bridges do not report errors properly and just stall pretty
AS> much indefinitely; found out the hard way, when a disk started to develop
My interpretation was different - the bridge firmware does not crash but 
remains alive (it does not report the error properly but "zis iz probably 
perfectly normal behaviour for a Vogon"). This is the Linux kernel that 
indefinitely tries to re-read. Am I wrong?

AS> What did work for my case was to copy the data from the disk and every 
AS> time the process stalled turn off power to the sata drive for a few 
AS> seconds (leaving the bridge connected). The bridge in most cases 
AS> recovered and a bit more data got off the drive.
My nerve is too weak to touch ground/power until the data line is 
disconnected. Running -rc1 seems not so dangerous...

-L
--
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/