[issue2140] hammer_io_delallocate panic with 'duplicate entry message'

[n0gO0i3 (via DragonFly issue tracker)]

New submission from n0gO0i3 <ttw+bsd at cobbled.net>:

Getting regular panics on HAMMER FSs when transferring large quantities of data 
over the network.  initally saw the issue with NFS but eliminated that and now 
seeing it with 'tar' piped across 'ssh'.  was most prevelant when using USB or 
FW storage but most recent test to internal IDE drive has thrown up the same 
error.

NB: transfers are generally across unreliable links (i.e. wireless) and oft-
times, long stalls (i.e. minutes) occur -- most recent crash was after i had 
paused a 'tar/ssh' transfer using CTL-Z.

NB: turning on crashdumps and re-executing tests but may take hours to fail - 
any pointers in the meantime would be excellent.

----------
files: dmesg-2011-10-06:12:57:24
keyword: HAMMER, i386, kernel
messages: 10158
nosy: ttw
priority: bug
status: unread
title: hammer_io_delallocate panic with 'duplicate entry message'

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