From: "Eric Bénard" <eric@eukrea.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Mário Isidoro" <marioisidoro@gmail.com>,
gregkh@suse.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH n_gsm] GSM Mux in non-transparent mode
Date: Thu, 10 Mar 2011 17:30:30 +0100 [thread overview]
Message-ID: <4D78FCA6.7010000@eukrea.com> (raw)
In-Reply-To: <20110310110658.0a46d19d@lxorguk.ukuu.org.uk>
>> There is a problem that happens if the process that is holding the
>> attached line discipline tries to detach it before a process using a
>> virtual com manages to close it. Both processes end up dealocked. I
>> think this has to do with the tty lock. I don't have the backtrace with
>> me
here is the log I get here :
[ 1051.950000] ------------[ cut here ]------------
[ 1051.950000] WARNING: at drivers/tty/tty_mutex.c:31 tty_lock+0x30/0x50()
[ 1051.960000] Modules linked in:
[ 1051.960000] [<c0029478>] (unwind_backtrace+0x0/0xe4) from [<c0034f30>]
(warn_slowpath_common+0x4c/0x64)
[ 1051.970000] [<c0034f30>] (warn_slowpath_common+0x4c/0x64) from [<c0034f60>]
(warn_slowpath_null+0x18/0x1c)
[ 1051.980000] [<c0034f60>] (warn_slowpath_null+0x18/0x1c) from [<c031550c>]
(tty_lock+0x30/0x50)
[ 1051.990000] [<c031550c>] (tty_lock+0x30/0x50) from [<c01af5b0>]
(__tty_hangup+0x78/0x47c)
[ 1052.000000] [<c01af5b0>] (__tty_hangup+0x78/0x47c) from [<c01ba69c>]
(gsm_cleanup_mux+0x198/0x214)
[ 1052.010000] [<c01ba69c>] (gsm_cleanup_mux+0x198/0x214) from [<c01baaf4>]
(gsmld_close+0x28/0x4c)
[ 1052.020000] [<c01baaf4>] (gsmld_close+0x28/0x4c) from [<c01b5974>]
(tty_ldisc_close+0x58/0x64)
[ 1052.030000] [<c01b5974>] (tty_ldisc_close+0x58/0x64) from [<c01b5b48>]
(tty_ldisc_release+0x38/0x70)
[ 1052.040000] [<c01b5b48>] (tty_ldisc_release+0x38/0x70) from [<c01b0e2c>]
(tty_release+0x41c/0x480)
[ 1052.050000] [<c01b0e2c>] (tty_release+0x41c/0x480) from [<c009667c>]
(fput+0x108/0x200)
[ 1052.060000] [<c009667c>] (fput+0x108/0x200) from [<c00939c8>]
(filp_close+0x60/0x6c)
[ 1052.070000] [<c00939c8>] (filp_close+0x60/0x6c) from [<c0036eb8>]
(put_files_struct+0x80/0xdc)
[ 1052.080000] [<c0036eb8>] (put_files_struct+0x80/0xdc) from [<c0038500>]
(do_exit+0x1b8/0x6bc)
[ 1052.080000] [<c0038500>] (do_exit+0x1b8/0x6bc) from [<c0038ac4>]
(do_group_exit+0xc0/0xf4)
[ 1052.090000] [<c0038ac4>] (do_group_exit+0xc0/0xf4) from [<c0044460>]
(get_signal_to_deliver+0x3ac/0x40c)
[ 1052.100000] [<c0044460>] (get_signal_to_deliver+0x3ac/0x40c) from
[<c0027190>] (do_signal+0x68/0x614)
[ 1052.110000] [<c0027190>] (do_signal+0x68/0x614) from [<c0027754>]
(do_notify_resume+0x18/0x60)
[ 1052.120000] [<c0027754>] (do_notify_resume+0x18/0x60) from [<c0024f94>]
(work_pending+0x24/0x28)
[ 1052.130000] ---[ end trace ac06c34c1914deef ]---
Eric
next prev parent reply other threads:[~2011-03-10 16:30 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-10 2:39 [PATCH n_gsm] GSM Mux in non-transparent mode Mário Isidoro
2011-03-10 11:06 ` Alan Cox
2011-03-10 16:30 ` Eric Bénard [this message]
2011-03-11 12:47 ` Mário Isidoro
2011-03-11 13:34 ` Eric Bénard
2011-03-11 15:27 ` Mário Isidoro
2011-03-11 17:00 ` Eric Bénard
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=4D78FCA6.7010000@eukrea.com \
--to=eric@eukrea.com \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=gregkh@suse.de \
--cc=linux-kernel@vger.kernel.org \
--cc=marioisidoro@gmail.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.