From: Josh Boyer <jwboyer-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Paul Taysom <taysom-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Cc: Paul Taysom <taysom-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Mandeep Baines <msb-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
Olof Johansson <olofj-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
Greg KH <greg-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>,
Jens Axboe <axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>,
Theodore Tso <tytso-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Andrew Morton <akpm-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Alexander Viro
<viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] fs: Fix mod_timer crash when removing USB sticks
Date: Fri, 13 Jan 2012 00:42:07 -0500 [thread overview]
Message-ID: <CA+5PVA7Yffs3-qdq6pSqDKLLngU7kBsdE92e31NnAM0=wrwp4w@mail.gmail.com> (raw)
In-Reply-To: <1326402935-31002-1-git-send-email-taysom-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
On Thu, Jan 12, 2012 at 4:15 PM, Paul Taysom <taysom-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org> wrote:
> From: Paul Taysom <taysom-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
>
> A USB stick with a ext file system on it, would occasionally crash
> when the stick was pulled.
>
> The problem was a timer was being set on the Backing Device Interface,
> bdi, after the USB device had been removed and the bdi had been
> unregistered. The bdi would then be later reinitialized by zeroing
> the timer without removing from the timer from the timer queue.
> This would eventually result in a kernel crash (NULL ptr dereference).
What backtrace did you see when it crashed? There have been a number of
reports where sd_revalidate_disk is at the top of the backtrace and this sounds
like it might be related.
josh
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next prev parent reply other threads:[~2012-01-13 5:42 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-12 21:15 [PATCH] fs: Fix mod_timer crash when removing USB sticks Paul Taysom
2012-01-12 21:38 ` Greg KH
2012-01-12 21:53 ` Mandeep Singh Baines
2012-01-12 22:02 ` Greg KH
[not found] ` <20120112215331.GB18166-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-01-12 22:11 ` Theodore Tso
[not found] ` <CAGagf4dk4KsZSkaWTO9Yegi=_wRJsYBPgfyks1z=wMZJV8gX0w@mail.gmail.com>
2012-01-12 22:35 ` Mandeep Singh Baines
[not found] ` <20120112223544.GC18166-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-01-12 23:23 ` Andrew Morton
[not found] ` <1326402935-31002-1-git-send-email-taysom-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2012-01-13 5:42 ` Josh Boyer [this message]
[not found] ` <CA+5PVA7Yffs3-qdq6pSqDKLLngU7kBsdE92e31NnAM0=wrwp4w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-01-13 15:39 ` Paul Taysom
-- strict thread matches above, loose matches on Subject: below --
2012-01-12 21:57 Paul Taysom
2012-03-16 17:36 ` Greg KH
2012-03-16 19:29 ` Paul Taysom
2012-03-16 19:43 ` Greg KH
2012-03-16 21:10 ` Theodore Tso
2012-03-17 0:06 ` Greg KH
2012-03-17 14:21 ` Alan Stern
2012-03-18 3:44 ` Ted Ts'o
2012-03-18 20:23 ` Alan Stern
2012-03-18 22:25 ` Mandeep Singh Baines
[not found] ` <CACBanvpzOdC4ns-pg1f92ptxrCJ2O=_oJhpKFD4NOB0hyF_+aA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-03-20 0:24 ` Paul Taysom
2012-03-20 2:02 ` Alan Stern
2012-03-22 16:15 ` Paul Taysom
2012-01-12 19:57 Paul Taysom
2012-01-12 20:15 ` Greg KH
2012-01-13 11:28 ` Sergei Shtylyov
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