linux-kernel - Re: [xen] double fault: 0000 [#1] PREEMPT SMP DEBUG

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:	Tue, 8 Oct 2013 10:26:24 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	xen-devel@...ts.xenproject.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [xen] double fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC


* Fengguang Wu <fengguang.wu@...el.com> wrote:

> After enabling CONFIG_DEBUG_OBJECTS_TIMERS=y, it will issue a WARNING followed by a "BUG: ..."

Cool!

> [    2.802167] parport_pc 00:04: reported by Plug and Play ACPI
> [    2.803818] parport0: PC-style at 0x378, irq 7 [PCSPP(,...)]
> [    2.806035] kobject: 'parport_pc.956' (ffff880006dc3820): kobject_release, parent           (null) (delayed)
> [    2.808626] ------------[ cut here ]------------                                                            
> [    2.809776] WARNING: CPU: 1 PID: 1 at /c/wfg/linux/lib/debugobjects.c:260 debug_print_object+0x7c/0x8d()
> [    2.812433] ODEBUG: init active (active state 0) object type: timer_list hint:           (null)         
> ......
> [    3.796079] BUG: unable to handle kernel NULL pointer dereference at           (null)

Mind posting the full backtrace? It should show the actual callsite that 
zaps the timer. I don't think we got that dump so far, I've only seen 
timer list corruption backtraces. (but I haven't read the whole thread.)

Thanks,

	Ingo
--
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/