URGENT: Clamd is wedged on multiple installations

Hi,

Something went badly wrong with clamd recently; it's stuck with
hundreds/thousands of open files per process and interrupting mail flow.

When a scanning thread finishes, I see this in the strace output.
(I ran clamdscan /etc/hosts as a test):

[pid  3707] 02:11:01 sendto(295, "/etc/hosts: OK\n", 15, 0, NULL, 0) = 15
[pid  3707] 02:11:01 shutdown(295, SHUT_RDWR) = 0
[pid  3707] 02:11:01 close(295)         = 0
[pid  3707] 02:11:01 futex(0x1933c3c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 387, {1516950691, 0}, ffffffff) = -1 ETIMEDOUT (Connection timed out)
[pid  3707] 02:11:31 futex(0x1933c10, FUTEX_WAKE_PRIVATE, 1) = 0
[pid  3707] 02:11:31 madvise(0x7fae6affe000, 8368128, MADV_DONTNEED) = 0
[pid  3707] 02:11:31 _exit(0)           = ?
[pid  3707] 02:11:31 +++ exited with 0 +++

So it scans the file, says it's OK. and then hangs in the futex for 30
seconds.

HELP!  This is causing major outages for many of our customers.

Regards,

Dianne.
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