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    SubjectRe: [BUG RT] 2.6.25.8-rt7 on 8-way
    While I have disabled RCU tracing to suppress the messages, I am
    getting them in another context:

    BUG: using smp_processor_id() in preemptible [00000000] code: sshd/3114
    caller is __qdisc_run+0x12e/0x1b5
    Pid: 3114, comm: sshd Not tainted 2.6.25.8-rt7 #3

    Call Trace:
    [<ffffffff8112da39>] debug_smp_processor_id+0xad/0xb8
    [<ffffffff8120e264>] __qdisc_run+0x12e/0x1b5
    [<ffffffff811ff1c8>] dev_queue_xmit+0x140/0x278
    [<ffffffff8122239e>] ip_queue_xmit+0x2c2/0x350
    [<ffffffff8127f8a6>] add_preempt_count+0x12/0x94
    [<ffffffff8108263e>] __inc_zone_state+0x6a/0x88
    [<ffffffff81231ffe>] tcp_transmit_skb+0x77e/0x7ba
    [<ffffffff8109aa60>] kmem_cache_alloc_node+0x129/0x152
    [<ffffffff81233a75>] __tcp_push_pending_frames+0x713/0x7df
    [<ffffffff81228da2>] tcp_sendmsg+0x93a/0xa52
    [<ffffffff811f0e97>] sock_aio_write+0xf8/0x110
    [<ffffffff8109feeb>] do_sync_write+0xc9/0x10c
    [<ffffffff81046da6>] autoremove_wake_function+0x0/0x2e
    [<ffffffff8103868b>] current_fs_time+0x1e/0x24
    [<ffffffff810a06ae>] vfs_write+0xc0/0x156
    [<ffffffff810a0c67>] sys_write+0x48/0x74
    [<ffffffff8100bf6b>] tracesys+0xdc/0xe1


    On Mon, Jun 30, 2008 at 7:37 AM, Steven Rostedt <rostedt@goodmis.org> wrote:
    >
    > On Sun, 29 Jun 2008, Sven-Thorsten Dietrich wrote:
    >
    >>
    >> On Sun, 2008-06-29 at 16:32 -0500, Noah Watkins wrote:
    >> > My kernel is very, very noisy with the following bug:
    >> >
    >> > - Full dmesg below
    >> > - Please CC me
    >> >
    >>
    >> I found this as well (adding Paul).
    >>
    >> If you disable CONFIG_PREEMPT_RCU_BOOST, does it go away?
    >>
    >
    > Turning off CONFIG_RCU_TRACE will also make it go away. The bug is that
    > the tracing of the RCU boost code uses smp_processor_id while the RCU
    > boost code is not in an atomic section.
    >
    > Paul has a fix for this already, and will be out in the next releases.
    >
    > -- Steve
    >


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