From: Daniel Walker <dwalker@mvista.com>
To: mingo@elte.hu
Cc: linux-kernel@vger.kernel.org
Subject: real time hang w/ latency tracing
Date: Tue, 03 Apr 2007 11:57:05 -0700 [thread overview]
Message-ID: <1175626625.10738.21.camel@imap.mvista.com> (raw)
With 2.6.21-rc5-rt8 / i386 . If I disable wakeup timing , and enable
interrupt off timing with latency tracing I can cause,
BUG: scheduling with irqs disabled: IRQ-16/0x00000000/909
caller is rt_spin_lock_slowlock+0x94/0x190
[<c010577a>] show_trace_log_lvl+0x3a/0x60
[<c0105fdd>] show_trace+0x2d/0x30
[<c01060c7>] dump_stack+0x27/0x30
[<c03f52db>] schedule+0x12b/0x130
[<c03f6314>] rt_spin_lock_slowlock+0x94/0x190
[<c03f6b35>] rt_spin_lock+0x25/0x30
[<c02f19bf>] serial8250_console_write+0x16f/0x190
[<c012b3aa>] __call_console_drivers+0x7a/0xa0
[<c012b427>] _call_console_drivers+0x57/0xa0
[<c012b58d>] release_console_sem+0xdd/0x1e0
[<c012bd46>] vprintk+0x226/0x3b0
[<c012bef0>] printk+0x20/0x30
[<c0158d29>] print_traces+0x49/0x100
[<c0105792>] show_trace_log_lvl+0x52/0x60
[<c0105fdd>] show_trace+0x2d/0x30
[<c01060c7>] dump_stack+0x27/0x30
[<c0158481>] check_critical_timing+0x2b1/0x380
[<c01585f6>] trace_hardirqs_on+0xa6/0xc0
[<c01046e5>] restore_nocheck+0x12/0x15
=======================
I do this by running,
echo 1 > /proc/sys/kernel/preempt_thresh
which clearly causes loads of output .. Then while the output is
screaming along I hold down the left arrow key and eventually the
message above starts to appear often .. Then the system hangs.
Also I'm using an NFS root which might help to bring out the error ..
Daniel
next reply other threads:[~2007-04-03 18:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-03 18:57 Daniel Walker [this message]
2007-04-04 1:41 ` Daniel Walker
2007-04-04 8:51 ` Ingo Molnar
2007-04-04 15:36 ` Daniel Walker
2007-04-04 15:42 ` Ingo Molnar
2007-04-04 15:57 ` Daniel Walker
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=1175626625.10738.21.camel@imap.mvista.com \
--to=dwalker@mvista.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
/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
all inboxes | Powered by JetHome®