From: Larry Finger <Larry.Finger@lwfinger.net>
To: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
wireless <linux-wireless@vger.kernel.org>
Subject: Re: Kernel BUG due to kernel page fault
Date: Fri, 27 Jan 2012 12:07:52 -0600 [thread overview]
Message-ID: <4F22E7F8.30804@lwfinger.net> (raw)
In-Reply-To: <20120127164219.GE19323@redhat.com>
On 01/27/2012 10:42 AM, Stanislaw Gruszka wrote:
> On Thu, Jan 26, 2012 at 04:36:47PM -0600, Larry Finger wrote:
>> Modules linked in: fuse autofs4 snd_pcm_oss snd_mixer_oss snd_seq
>> snd_seq_device edd nfs nfsd lockd auth_rpcgss nfs_acl sunrpc
>> exportfs ipv6 vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> RIP: 0010:[<ffffffff811e3ecb>] [<ffffffff811e3ecb>] strnlen+0xb/0x30
> [snip]
>> Call Trace:
>> [<ffffffff811e58ae>] string.isra.4+0x3e/0xd0
>> [<ffffffff811e6889>] vsnprintf+0x219/0x600
>> [<ffffffff81153093>] seq_printf+0x53/0x80
>> [<ffffffff811e21db>] ? radix_tree_lookup+0xb/0x10
>> [<ffffffff810ba5ab>] show_interrupts+0x24b/0x300
>> [<ffffffff81153474>] seq_read+0x2b4/0x3f0
>> [<ffffffff811531c0>] ? seq_lseek+0x100/0x100
>> [<ffffffff8118b651>] proc_reg_read+0x81/0xc0
>> [<ffffffff8112f967>] vfs_read+0xa7/0x160
>> [<ffffffff8112fa65>] sys_read+0x45/0x90
>> [<ffffffff813a33a2>] system_call_fastpath+0x16/0x1b
>
> This is call trace from cat /proc/interrupts, seems something pass
> malformed string to request_irq(). I do not think this is rtlwifi,
> rather that vbox thing.
Thanks for responding. Vbox may be guilty of a lot of things, but this is not
one of them.
Just before I received your reply, I found the problem. The PCI driver in
rtlwifi sets a flag to indicate that interrupts have been enabled, and uses that
flag to tell if the cleanup needs to disable them. When I moved the code that
starts mac80211, I also moved the statement that sets the flag. As a result, the
driver was exiting with interrupts still enabled, and the BUG resulted from
that. I can now unload the driver when firmware is not available.
Larry
next prev parent reply other threads:[~2012-01-27 18:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-26 22:36 Kernel BUG due to kernel page fault Larry Finger
2012-01-27 16:42 ` Stanislaw Gruszka
2012-01-27 18:07 ` Larry Finger [this message]
2012-01-28 4:30 ` Johannes Berg
2012-01-28 23:02 ` Larry Finger
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4F22E7F8.30804@lwfinger.net \
--to=larry.finger@lwfinger.net \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-wireless@vger.kernel.org \
--cc=sgruszka@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).