lkml.org 
[lkml]   [2011]   [Dec]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: kvm deadlock
    On 12/14/2011 04:06 PM, Marcelo Tosatti wrote:
    > On Wed, Dec 14, 2011 at 04:02:48PM +0200, Avi Kivity wrote:
    > > On 12/14/2011 04:00 PM, Marcelo Tosatti wrote:
    > > > The other traces have apparently bogus NMI interrupts, but it might be a
    > > > software bug, OK.
    > >
    > > These are from sysrq-blah, no? I'm looking at them now.
    >
    > I don't know. Its a hang ? It could be memory corruption (of the timer
    > olist) instead of a bogus NMI actually, the second.

    Looks like lots of cpus are waiting on the smp_call_function_single()
    lock. Looks like rcu is complaining:


    [ 4959.814010] [<ffffffff81252e47>] __const_udelay+0x2c/0x2e
    [ 4959.814017] [<ffffffff81027449>]
    native_safe_apic_wait_icr_idle+0x31/0x3d
    [ 4959.814024] [<ffffffff81027f11>]
    __default_send_IPI_dest_field.constprop.0+0x23/0x5d
    [ 4959.814032] [<ffffffff81027f93>]
    default_send_IPI_mask_sequence_phys+0x48/0x97
    [ 4959.814039] [<ffffffff81089848>] ? tick_nohz_handler+0xdf/0xdf
    [ 4959.814044] [<ffffffff8102b561>] physflat_send_IPI_all+0x17/0x19
    [ 4959.814052] [<ffffffff81028102>]
    arch_trigger_all_cpu_backtrace+0x57/0x89
    [ 4959.814057] [<ffffffff810c7711>] __rcu_pending+0x89/0x328
    [ 4959.814063] [<ffffffff81089848>] ? tick_nohz_handler+0xdf/0xdf
    [ 4959.814067] [<ffffffff810c7e0a>] rcu_check_callbacks+0x88/0xb9
    [ 4959.814071] [<ffffffff8106aeba>] update_process_times+0x3f/0x75

    Maybe the core issue is that CPU 3 is spinning in do_insn_fetch() and
    denying rcu grace periods. Nate, can you provide a few more dumps (this
    is looking at the second paste, so more of the same)?

    --
    error compiling committee.c: too many arguments to function



    \
     
     \ /
      Last update: 2011-12-14 15:31    [W:0.024 / U:93.496 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site