OSD Crash with scan_min and scan_max values reduced

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Hello,
I have reduced the scan_min and scan_max as below. After the below
change, during the scrubbing, got the op_tp_thread time out after 15.
After some time, OSDs crashed also... Any suggestions will be
helpful... Thanking you.
==
-osd_backfill_scan_min = 64
-osd_backfill_scan_max = 512
+osd_backfill_scan_min = 16
+osd_backfill_scan_max = 32
osd_op_thread_timeout = 15
osd_recovery_thread_timeout = 30
==

emerg:  2016-02-22 02:48:24.301522 7f8ee3096700  1 heartbeat_map
is_healthy 'OSD::op_tp thread 0x7f8edf08e700' had timed out after 15

2016-02-22T02:54:20.325657+00:00 emerg:  --- begin dump of recent events ---

…

2016-02-22T02:54:20.435546+00:00 emerg:  2016-02-22 02:54:20.315656
7f31a2166700  1 heartbeat_map reset_timeout 'OSD::op_tp thread
0x7f31a2166700' had suicide timed out after 150



2016-02-22T02:54:20.456737+00:00 emerg:  2016-02-22 02:54:20.237829
7fa09e05f700 -1 common/HeartbeatMap.cc: In function 'bool
ceph::HeartbeatMap::_check(ceph::heartbeat_handle_d*, const char*,
time_t)' thread 7fa09e05f700 time 2016-02-22 02:54:20.187089

common/HeartbeatMap.cc: 79: FAILED assert(0 == "hit suicide timeout")



ceph version 0.80.7 (6c0127fcb58008793d3c8b62d925bc91963672a3)

1: (ceph::HeartbeatMap::_check(ceph::heartbeat_handle_d*, char const*,
long)+0x107) [0x9c5757]

2: (ceph::HeartbeatMap::is_healthy()+0xa7) [0x9c6107]

3: (OSD::handle_osd_ping(MOSDPing*)+0x81b) [0x647a5b]

4: (OSD::heartbeat_dispatch(Message*)+0x51b) [0x648d0b]

5: (DispatchQueue::entry()+0x549) [0xb27269]

6: (DispatchQueue::DispatchThread::entry()+0xd) [0xa618ad]

7: (()+0x7e9a) [0x7fa0b4e77e9a]

8: (clone()+0x6d) [0x7fa0b3d708bd]

NOTE: a copy of the executable, or `objdump -rdS <executable>` is
needed to interpret this.
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