[Xen-devel] soft lockup when shutting down - rebooting domUs

["Pablo Montesinos" <pablomontesinos@xxxxxxxxx>]

Hi all:

Whenever I shutdown a domU, I always get the same soft lockup panic (
I copied itat the bottom of this email), and most of the times I have
to completely reboot my machine. I have been trying to debug this
error, and it seems that the CPUs where the soft lockup is detected,
are effectively being shut down (should the soft lockup detector being
run on those CPUs that are being shutdown?). However, in one of the
cases, the CPU in soft lockup is executing

force_evtchn_callback

Any ideas? Running unstable on RHEL, 32procs (physical, ht off), 64 GB RAM,
Thanks,
Pablo

BUG: soft lockup detected on CPU#30!
Jun 12 10:00:19 einstein kernel: CPU 30:
Jun 12 10:00:19 einstein kernel: Modules linked in: xt_tcpudp
xt_physdev iptable_filter iptable_nat ip_nat ip_conntrack ip_tables
x_tables bridge parport_pc lp parport autofs4 i2c_dev i2c_core sunrpc
dm_multipath button battery ac joydev ohci_hcd ehci_hcd tg3
dm_snapshot dm_zero dm_mirror dm_mod aacraid sd_mod scsi_mod
Jun 12 10:00:19 einstein kernel: Pid: 0, comm: swapper Not tainted
2.6.16.13-xen0 #2
Jun 12 10:00:19 einstein kernel: RIP: e030:[<ffffffff801073aa>]
<ffffffff801073aa>{hypercall_page+938}
Jun 12 10:00:19 einstein kernel: RSP: e02b:ffff8800011b1ee8  EFLAGS: 00000246
Jun 12 10:00:19 einstein kernel: RAX: 0000000000000000 RBX:
000000000000001e RCX: ffffffff801073aa
Jun 12 10:00:19 einstein kernel: RDX: 0000000000000001 RSI:
0000000000000000 RDI: 0000000000000001
Jun 12 10:00:19 einstein kernel: RBP: ffff8800011b1f20 R08:
00000001036ba734 R09: 0000000000000034
Jun 12 10:00:19 einstein kernel: R10: 0000000000001000 R11:
0000000000000246 R12: 0000000000000000
Jun 12 10:00:19 einstein kernel: R13: 0000000000000000 R14:
0000000000000000 R15: 0000000000000000
Jun 12 10:00:19 einstein kernel: FS:  00002b5ed2c633e0(0000)
GS:ffffffff80524f00(0000) knlGS:0000000000000000
Jun 12 10:00:19 einstein kernel: CS:  e033 DS: 002b ES: 002b
Jun 12 10:00:19 einstein kernel:
Jun 12 10:00:19 einstein crond(pam_unix)[24642]: session opened for
user root by (uid=0)
Jun 12 10:00:19 einstein kernel: Call Trace:
<ffffffff8010ec91>{safe_halt+126} <ffffffff80108dd0>{xen_idle+108}
Jun 12 10:00:19 einstein crond(pam_unix)[24643]: session opened for
user root by (uid=0)
Jun 12 10:00:19 einstein kernel:
<ffffffff80108e37>{cpu_idle+83}
<ffffffff802c7a34>{cpu_bringup_and_idle+14

---------------------------------------
Call Trace: <IRQ> <ffffffff802c527f>{force_evtchn_callback+14}
       <ffffffff8010e080>{sync_xen_wallclock+351}
<ffffffff8013364f>{mod_timer+43}
       <ffffffff8010ea11>{sync_cmos_clock+718}
<ffffffff8010e743>{sync_cmos_clock+0}
       <ffffffff80133bf7>{run_timer_softirq+405}
<ffffffff8012fcf3>{__do_softirq+119}
       <ffffffff8010b782>{call_softirq+30} <ffffffff8010ca00>{do_softirq+76}
       <ffffffff8012fe63>{irq_exit+72} <ffffffff8010c9aa>{do_IRQ+69}
       <ffffffff802c533f>{evtchn_do_upcall+190}
<ffffffff8010b2b2>{do_hypervisor_callback+30} <EOI>
       <ffffffff801073aa>{hypercall_page+938}
<ffffffff801073aa>{hypercall_page+938}
       <ffffffff8010ec91>{safe_halt+126} <ffffffff80108dd0>{xen_idle+108}
       <ffffffff80108e37>{cpu_idle+83} <ffffffff80108026>{rest_init+38}
       <ffffffff8053f747>{start_kernel+496} <ffffffff8053f1b8>{_sinittext+440}

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