cannot lock/unlock group at ...

[spam at keyos.org]

Hello.

Today after upgrading from INN 2.3.3 to
INN 2.4.1 using regular 'make update'
I started seeing following error message
in general log:

innd: [ID 801587 local0.error] tradindexed: cannot lock group entry at 2008648: Resource temporarily unavailable
innd: [ID 801587 local0.error] tradindexed: cannot lock group entry at 2008648: Resource temporarily unavailable
innd: [ID 801587 local0.error] tradindexed: cannot unlock group entry at 2008648: Resource temporarily unavailable
innd: [ID 801587 local0.error] tradindexed: cannot unlock group entry at 2008648: Resource temporarily unavailable

Huge amount of such messages coming in bulks
(around 100 messages at once and then pause for
a minute or two). The numbers of group entry position
in the message change constantly.

New binaries were compiled with exact same options
as old ones and configuration was checked and compared
to generated samples.

I don't see any impact on service, but I would like
to understand why there's a problem with locking
and to fix it.

Any help would be appreciated.

Stas.