Re: Please report all left over "DWARF2 unwinder stucks"

[Roland Dreier]

Hi Andi, I just got this with Linus's -git updated as of this morning
(head is 95f3eff6997ae4a6754c1d874ec0a414d97c44d1).  The soft lockup
is a bug in code I was testing but I was only touching drivers/infiniband, 
so it shouldn't make a difference for this.

Let me know if there's any more info you need.

[  971.926760] BUG: soft lockup detected on CPU#0!
[  971.940287]
[  971.940288] Call Trace:
[  971.952076]  [<ffffffff8026018f>] show_trace+0x34/0x47
[  971.967433]  [<ffffffff802601b4>] dump_stack+0x12/0x17
[  971.982793]  [<ffffffff80294a10>] softlockup_tick+0xdb/0xed
[  971.999517]  [<ffffffff8027e49e>] update_process_times+0x42/0x68
[  972.017521]  [<ffffffff802677d0>] smp_local_timer_interrupt+0x23/0x47
[  972.036770]  [<ffffffff80267c7a>] smp_apic_timer_interrupt+0x38/0x3e
[  972.055761]  [<ffffffff80254ce6>] apic_timer_interrupt+0x66/0x70
[  972.073697] DWARF2 unwinder stuck at apic_timer_interrupt+0x66/0x70
[  972.092424]
[  972.096886] Leftover inexact backtrace:
[  972.096887]
[  972.112815]  <IRQ>  [<ffffffff802596dc>] _spin_unlock_irqrestore+0x8/0x9
[  972.132905]  [<ffffffff880a628e>] :ib_ipath:ipath_req_notify_cq+0x4b/0x55
[  972.153190]  [<ffffffff88227e02>] :ib_ipoib:ipoib_poll+0x4a0/0x540
[  972.171661]  [<ffffffff8020b4c1>] net_rx_action+0xa4/0x161
[  972.188056]  [<ffffffff8020f953>] __do_softirq+0x55/0xc4
[  972.203933]  [<ffffffff80316df1>] end_msi_irq_wo_maskbit+0x9/0x16
[  972.222146]  [<ffffffff8025523c>] call_softirq+0x1c/0x30
[  972.238023]  [<ffffffff8026116a>] do_softirq+0x2c/0x7e
[  972.253382]  [<ffffffff80261135>] do_IRQ+0x61/0x6a
[  972.267703]  [<ffffffff8025fa18>] default_idle+0x0/0x47
[  972.283321]  [<ffffffff80254631>] ret_from_intr+0x0/0xa
[  972.298938]  <EOI>  [<ffffffff8025fa41>] default_idle+0x29/0x47
[  972.316688]  [<ffffffff802418a4>] cpu_idle+0x50/0x6f
[  972.331525]  [<ffffffff80520682>] start_kernel+0x211/0x216
[  972.347924]  [<ffffffff8052015a>] _sinittext+0x15a/0x15e
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