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Subject-rc6, "DWARF2 unwinder stuck at" ...

Jan,

in 2.6.19-rc6 i'm getting frequent unwinder failures, like:

[<c0104eb5>] dump_trace+0x69/0x1b0
[<c0105013>] show_trace_log_lvl+0x17/0x2b
[<c034e6c4>] __func__.18297+0xf3fd/0x3ccf5
DWARF2 unwinder stuck at __func__.18297+0xf3fd/0x3ccf5

Leftover inexact backtrace:

[<c010534b>] show_trace+0xf/0x11
[<c0105360>] dump_stack+0x13/0x15
[<c01419e9>] __lock_acquire+0x6fe/0x98a
[<c0175956>] cache_alloc_refill+0x8f/0x534
[<c0141f14>] lock_acquire+0x5b/0x77
[<f0a32963>] __ip_ct_refresh_acct+0x123/0x15b [ip_conntrack]
[<f0a32963>] __ip_ct_refresh_acct+0x123/0x15b [ip_conntrack]
[<f0a34acc>] udp_packet+0x9e/0xaa [ip_conntrack]
[<f0a33437>] ip_conntrack_in+0x385/0x479 [ip_conntrack]
[<c01215d8>] try_to_wake_up+0x3ea/0x3f4
[<c0324300>] netlbl_mgmt_listall_cb+0xc8/0x1bd
[<c02dfe28>] nf_iterate+0x38/0x6a
[<c02e4dbf>] ip_rcv_finish+0x0/0x271
[<c02dfeac>] nf_hook_slow+0x52/0xc9
[<c02e4dbf>] ip_rcv_finish+0x0/0x271
[<c02e564f>] ip_rcv+0x1fc/0x491
[<c02e4dbf>] ip_rcv_finish+0x0/0x271
[<c02c1f2a>] sock_queue_rcv_skb+0xd5/0xdc
[<c02e5453>] ip_rcv+0x0/0x491
[<c02cac42>] netif_receive_skb+0x339/0x366
[<c02cad04>] process_backlog+0x95/0xed
[<c02c909e>] net_rx_action+0xad/0x1da
[<c012bfdc>] ksoftirqd+0x107/0x1e0
[<c012bed5>] ksoftirqd+0x0/0x1e0
[<c0139520>] kthread+0xbf/0xeb
[<c0139461>] kthread+0x0/0xeb
[<c0104c23>] kernel_thread_helper+0x7/0x10
=======================

it's quite an annoyance, i rarely see the unwinder getting a stackdump
right, without 'falling back' to the inexact backtrace ...

Ingo
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