[Xen-devel] Xen-unstable Linux 4.2-rc5: NMI watchdog: BUG: soft lockup - CPU#0 stuck for 51s! xen_hypercall_xen_version+0xa/0x20

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Hi,

At the moment i'm encounterig this new splat in a PV guest,
both dom0 and domU running a kernel 4.2-rc5 (last commit 
7ddab73346a1277b90fd6a4d044bc948f9cc9ad8)
and xen-unstable (last commit git:201eac8-dirty)

--
Sander


NMI watchdog: BUG: soft lockup - CPU#0 stuck for 51s! [swapper/0:0]
[14410.728735] Modules linked in:
[14410.728735] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 
4.2.0-rc6-20150814-linus-doflr+ #1
[14410.728735] task: ffffffff8221a580 ti: ffffffff82200000 task.ti: 
ffffffff82200000
[14410.728735] RIP: e030:[<ffffffff8100122a>]  [<ffffffff8100122a>] 
xen_hypercall_xen_version+0xa/0x20
[14410.728735] RSP: e02b:ffff88000fc03d48  EFLAGS: 00000246
[14410.728735] RAX: 0000000000040006 RBX: 0000000000000200 RCX: ffffffff8100122a
[14410.728735] RDX: 0000000000000001 RSI: 00000000deadbeef RDI: 00000000deadbeef
[14410.728735] RBP: ffff88000fc03d60 R08: ffff88000fc03ee0 R09: 0000000000000000
[14410.728735] R10: ffffffff8220a0c0 R11: 0000000000000246 R12: 00000000ffffffff
[14410.728735] R13: 0000000000000001 R14: ffff88000e3faedc R15: 0000000000000005
[14410.728735] FS:  00007f71f50e2800(0000) GS:ffff88000fc00000(0000) 
knlGS:0000000000000000
[14410.728735] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[14410.728735] CR2: 00007fffaef93808 CR3: 0000000003090000 CR4: 0000000000000660
[14410.728735] Stack:
[14410.728735]  0000000000000020 0000000000000007 ffffffff81008dbd 
ffff88000fc03dd8
[14410.728735]  ffffffff81009592 0000000000000020 ffffffff8220a0c0 
0000000000000000
[14410.728735]  ffff88000fc03ee0 0000000000000200 0000000000000200 
0000000000000001
[14410.728735] Call Trace:
[14410.728735]  <IRQ>
[14410.728735]  [<ffffffff81008dbd>] ? xen_force_evtchn_callback+0xd/0x10
[14410.728735]  [<ffffffff81009592>] check_events+0x12/0x20
[14410.728735]  [<ffffffff8100957f>] ? xen_restore_fl_direct_reloc+0x4/0x4
[14410.728735]  [<ffffffff81af78a5>] ? _raw_spin_unlock_irqrestore+0x25/0x30
[14410.728735]  [<ffffffff8110ed03>] try_to_del_timer_sync+0x43/0x60
[14410.728735]  [<ffffffff8110ed67>] del_timer_sync+0x47/0x60
[14410.728735]  [<ffffffff81a2b598>] inet_csk_reqsk_queue_drop+0x118/0x1f0
[14410.728735]  [<ffffffff81a2b7c6>] reqsk_timer_handler+0x156/0x260
[14410.728735]  [<ffffffff81a2b670>] ? inet_csk_reqsk_queue_drop+0x1f0/0x1f0
[14410.728735]  [<ffffffff8110f387>] call_timer_fn.isra.27+0x17/0x80
[14410.728735]  [<ffffffff81a2b670>] ? inet_csk_reqsk_queue_drop+0x1f0/0x1f0
[14410.728735]  [<ffffffff8110f51d>] run_timer_softirq+0x12d/0x200
[14410.728735]  [<ffffffff810ca6c3>] __do_softirq+0x103/0x210
[14410.728735]  [<ffffffff810ca9cb>] irq_exit+0x4b/0xa0
[14410.728735]  [<ffffffff814f04d4>] xen_evtchn_do_upcall+0x34/0x50
[14410.728735]  [<ffffffff81af922e>] xen_do_hypervisor_callback+0x1e/0x40
[14410.728735]  <EOI>
[14410.728735]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[14410.728735]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[14410.728735]  [<ffffffff81008d60>] ? xen_safe_halt+0x10/0x20
[14410.728735]  [<ffffffff810188d3>] ? default_idle+0x13/0x20
[14410.728735]  [<ffffffff81018e1a>] ? arch_cpu_idle+0xa/0x10
[14410.728735]  [<ffffffff810f8e7e>] ? default_idle_call+0x2e/0x50
[14410.728735]  [<ffffffff810f9112>] ? cpu_startup_entry+0x272/0x2e0
[14410.728735]  [<ffffffff81ae7867>] ? rest_init+0x77/0x80
[14410.728735]  [<ffffffff82312f58>] ? start_kernel+0x43b/0x448
[14410.728735]  [<ffffffff823124ef>] ? x86_64_start_reservations+0x2a/0x2c
[14410.728735]  [<ffffffff82316008>] ? xen_start_kernel+0x550/0x55c
[14410.728735] Code: cc 51 41 53 b8 10 00 00 00 0f 05 41 5b 59 c3 cc cc cc cc 
cc cc cc cc cc cc cc cc cc cc cc cc cc cc 51 41 53 b8 11 00 00 00 0f 05 <41> 5b 
59 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc


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