| 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
| ||
|
Message-ID: <486337D4.1000904@nokia.com> Date: Thu, 26 Jun 2008 09:31:48 +0300 From: Stefan Becker <Stefan.Becker@...ia.com> To: ext Alan Stern <stern@...land.harvard.edu>, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org Subject: Re: [REGRESSION] 2.6.24/25: random lockups when accessing external USB harddrive Hi, ext Alan Stern wrote: > On Wed, 25 Jun 2008, Stefan Becker wrote: > >> HCD URB list locked by usb_hcd_link_urb_to_ep! >> >> As far as I understand the matter this only can happen if >> usb_hcd_link_urb_to_ep() gets interrupted while holding the spinlock. >> But according to the contract at the header of the function it should be >> called with interrupts disabled! > > So it should. Do you know how to test whether interrupts are enabled? > There's a routine called raw_irqs_disabled() defined in > include/asm/irqflags.h. Stick it inside usb_hcd_link_urb_to_ep, and > the first time it returns nonzero, do a dump_stack(). Tried both and got nothing. So either our reasoning is wrong or something really weird is going on. I'll try to improve my debugging code and use dump_stack() at the place where it locks up. Regards, Stefan --- Stefan Becker E-Mail: Stefan.Becker@...ia.com -- 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/
Powered by blists - more mailing lists