From: Dave Jones <davej@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Rik van Riel <riel@redhat.com>, Ingo Molnar <mingo@redhat.com>,
Michel Lespinasse <walken@google.com>
Subject: Re: pipe/page fault oddness.
Date: Tue, 30 Sep 2014 12:40:47 -0400 [thread overview]
Message-ID: <20140930164047.GA18354@redhat.com> (raw)
In-Reply-To: <20140930162201.GC15903@redhat.com>
On Tue, Sep 30, 2014 at 12:22:01PM -0400, Dave Jones wrote:
> [<ffffffff91167913>] ? trace_graph_entry+0x123/0x250
> [<ffffffff9115b7ce>] ? trace_buffer_lock_reserve+0x1e/0x60
> [<ffffffff911c3c67>] ? handle_mm_fault+0x3a7/0xcd0
> [<ffffffff910ce68d>] ? trace_hardirqs_on+0xd/0x10
> [<ffffffff911678f8>] ? trace_graph_entry+0x108/0x250
> [<ffffffff91042d14>] ? __do_page_fault+0x234/0x600
> [<ffffffff9103ad23>] ? prepare_ftrace_return+0x73/0xe0
> [<ffffffff910ca040>] ? down_write_nested+0xc0/0xc0
> [<ffffffff910ac74d>] ? get_parent_ip+0xd/0x50
> [<ffffffff91042d14>] ? __do_page_fault+0x234/0x600
> [<ffffffff9103ad23>] ? prepare_ftrace_return+0x73/0xe0
> [<ffffffff91826b3a>] ? ftrace_graph_caller+0x5a/0x85
> [<ffffffff913a5ebe>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> [<ffffffff9118eda7>] ? context_tracking_user_exit+0x67/0x1b0
> [<ffffffff910430fe>] ? do_page_fault+0x1e/0x70
> [<ffffffff913a5efd>] ? trace_hardirqs_off_thunk+0x3a/0x3c
> [<ffffffff911bd7e3>] ? copy_page_to_iter+0x3b3/0x500
> [<ffffffff9120eddf>] ? pipe_read+0xdf/0x330
> [<ffffffff9120ed00>] ? pipe_write+0x490/0x490
> [<ffffffff912051a0>] ? do_sync_readv_writev+0xa0/0xa0
> [<ffffffff912053b8>] ? do_iter_readv_writev+0x78/0xc0
> [<ffffffff91206bbe>] ? do_readv_writev+0xce/0x280
> [<ffffffff9120ed00>] ? pipe_write+0x490/0x490
> [<ffffffff910cbbf6>] ? lock_release_holdtime.part.29+0xe6/0x160
> [<ffffffff910ac74d>] ? get_parent_ip+0xd/0x50
> [<ffffffff910ac74d>] ? get_parent_ip+0xd/0x50
> [<ffffffff910ac8ab>] ? preempt_count_sub+0x6b/0xf0
> [<ffffffff91206da9>] ? vfs_readv+0x39/0x50
> [<ffffffff91206e6c>] ? SyS_readv+0x5c/0x100
> [<ffffffff918249e4>] ? tracesys+0xdd/0xe2
>
> That second one is odd, because I had disabled all the function tracing
> before doing the sysrq-t, so still seeing all the ftrace stuff on the
> stack suprised me.
ah, echo 0 > tracing_on isn't enough, I had to 0 out set_ftrace_pid too.
Never mind. Subsequent traces all looking the same, minus the tracing
junk though.
Is there some way I can figure out what address it's faulting on ?
I wonder if that might give some clues.
Dave
next prev parent reply other threads:[~2014-09-30 16:41 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-30 3:33 pipe/page fault oddness Dave Jones
2014-09-30 4:27 ` Linus Torvalds
2014-09-30 4:33 ` Dave Jones
[not found] ` <CA+55aFwxdOBKHwwp7Zq1k19mHCyHYmYqigCVt59AtB-P7Zva1w@mail.gmail.com>
2014-09-30 15:52 ` Linus Torvalds
2014-09-30 16:03 ` Rik van Riel
2014-09-30 16:07 ` Dave Jones
2014-09-30 16:26 ` Linus Torvalds
2014-09-30 16:05 ` Dave Jones
2014-09-30 16:10 ` Linus Torvalds
2014-09-30 16:22 ` Dave Jones
2014-09-30 16:40 ` Dave Jones [this message]
2014-09-30 16:46 ` Linus Torvalds
2014-09-30 18:20 ` Dave Jones
2014-09-30 18:58 ` Linus Torvalds
2014-10-01 8:19 ` Hugh Dickins
2014-10-01 16:01 ` Linus Torvalds
2014-10-01 16:18 ` Linus Torvalds
2014-10-01 17:29 ` Rik van Riel
2014-10-02 8:28 ` Peter Zijlstra
2014-10-01 20:20 ` Linus Torvalds
2014-10-01 21:09 ` Rik van Riel
2014-10-01 22:08 ` Sasha Levin
2014-10-01 22:28 ` Chuck Ebbert
2014-10-02 3:32 ` Sasha Levin
2014-10-02 8:03 ` Chuck Ebbert
2014-10-02 14:49 ` Sasha Levin
2014-10-01 22:42 ` Linus Torvalds
2014-10-02 14:25 ` Kirill A. Shutemov
2014-10-02 16:01 ` Linus Torvalds
2014-10-02 16:35 ` Kirill A. Shutemov
2014-10-02 15:04 ` Sasha Levin
2014-10-02 16:10 ` Linus Torvalds
2014-10-03 5:00 ` Sasha Levin
2014-10-03 15:43 ` Linus Torvalds
2014-10-03 15:58 ` Dave Jones
2014-10-03 16:02 ` Sasha Levin
2014-10-02 12:45 ` Mel Gorman
2014-10-06 19:18 ` Aneesh Kumar K.V
2014-10-07 12:45 ` Linus Torvalds
2014-10-08 10:37 ` Aneesh Kumar K.V
2014-10-02 8:47 ` Hugh Dickins
2014-10-02 15:57 ` Linus Torvalds
2014-09-30 4:35 ` Al Viro
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