test/format hung in eviction

############################################

#  RUN PARAMETERS

############################################

abort=0

auto_throttle=1

firstfit=0

bitcnt=5

bloom=1

bloom_bit_count=17

bloom_hash_count=16

bloom_oldest=0

cache=1

checkpoints=1

checksum=uncompressed

chunk_size=8

compaction=0

compression=none

data_extend=0

data_source=file

delete_pct=31

dictionary=0

evict_max=0

file_type=row-store

backups=1

huffman_key=0

huffman_value=0

insert_pct=7

internal_key_truncation=1

internal_page_max=17

isolation=read-committed

key_gap=4

key_max=122

key_min=17

leak_memory=0

leaf_page_max=10

logging=0

logging_archive=1

logging_prealloc=0

logging=0

lsm_worker_threads=3

merge_max=6

mmap=1

ops=1000

prefix_compression=1

prefix_compression_min=0

repeat_data_pct=64

reverse=0

rows=10000

runs=50

split_pct=80

statistics=1

threads=1

timer=0

value_max=1107

value_min=18

wiredtiger_config=

write_pct=50

############################################

(gdb) thread apply all bt

Thread 3 (Thread 0x7f013687d700 (LWP 127010)):

#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238

WT-1  0x00000000004354af in __wt_cond_wait (session=session@entry=0x1cc7b40, cond=0x1ce2a10, usecs=usecs@entry=100000) at ../src/os_posix/os_mtx_cond.c:77

WT-2  0x000000000042402e in __evict_server (arg=0x1cc7b40) at ../src/evict/evict_lru.c:195

WT-3  0x0000003f17e07ee5 in start_thread (arg=0x7f013687d700) at pthread_create.c:309

WT-4  0x0000003f176f4b8d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f013607c700 (LWP 127011)):

#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238

WT-1  0x00000000004354af in __wt_cond_wait (session=session@entry=0x1cc7e00, cond=0x1cf9250, usecs=usecs@entry=10000000) at ../src/os_posix/os_mtx_cond.c:77

WT-2  0x000000000041c744 in __sweep_server (arg=0x1cc7e00) at ../src/conn/conn_sweep.c:122

WT-3  0x0000003f17e07ee5 in start_thread (arg=0x7f013607c700) at pthread_create.c:309

WT-4  0x0000003f176f4b8d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f0136a8a740 (LWP 94803)):

#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238

WT-1  0x00000000004354af in __wt_cond_wait (session=session@entry=0x1cc80c0, cond=0x1ce2a80, usecs=usecs@entry=100000) at ../src/os_posix/os_mtx_cond.c:77

WT-2  0x00000000004c523c in __wt_cache_full_check (session=0x1cc80c0) at ../src/include/cache.i:166

WT-3  __cursor_enter (session=0x1cc80c0) at ../src/include/cursor.i:62

WT-4  __curfile_enter (cbt=<optimized out>, cbt=<optimized out>) at ../src/include/cursor.i:97

WT-5  __cursor_func_init (reenter=1, cbt=0x24a2c50) at ../src/include/cursor.i:184

WT-6  __wt_btcur_search (cbt=cbt@entry=0x24a2c50) at ../src/btree/bt_cursor.c:307

WT-7  0x0000000000493533 in __curfile_search (cursor=0x24a2c50) at ../src/cursor/cur_file.c:166

WT-8  0x00000000004127a4 in read_row (keyno=2, key=0x7fff0744e670, cursor=0x24a2c50) at ../../../test/format/ops.c:601

WT-9  wts_read_scan () at ../../../test/format/ops.c:560

WT-10 0x000000000040d8d7 in main (argc=<optimized out>, argv=<optimized out>) at ../../../test/format/t.c:187

(gdb) p pages_evicted

$2 = 2166

(gdb) p *cache

$3 = {bytes_inmem = 6458665, pages_inmem = 2169, bytes_evict = 5202306, pages_evict = 2166, bytes_dirty = 1891, pages_dirty = 1, read_gen = 4450648, 

  evict_cond = 0x1ce2a10, evict_lock = {lock = {__data = {__lock = 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0, __spins = 0, __elision = 0, __list = {

          __prev = 0x0, __next = 0x0}}, __size = '\000' <repeats 39 times>, __align = 0}, counter = 0, name = 0x65e6a1 "cache eviction", id = 0 '\000', 

    initialized = 1 '\001'}, evict_walk_lock = {lock = {__data = {__lock = 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0, __spins = 0, __elision = 0, 

        __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' <repeats 39 times>, __align = 0}, counter = 0, name = 0x65e6b0 "cache walk", id = 0 '\000', 

    initialized = 1 '\001'}, evict_waiter_cond = 0x1ce2a80, eviction_trigger = 95, eviction_target = 80, eviction_dirty_target = 80, evict = 0x1ce2af0, 

  evict_current = 0x0, evict_candidates = 0, evict_entries = 0, evict_max = 0, evict_slots = 400, evict_file_next = 0x0, sync_request = 0, sync_complete = 0, 

  cp_saved_evict = 0, cp_current_evict = 0, cp_skip_count = 0, cp_reserved = 0, cp_session = 0x0, cp_tid = 0, flags = 16}

(gdb) p conn->cache_size

$5 = 1048576

(gdb) p *ref->page

$32 = {u = {intl = {recno = 0, parent_ref = 0x1cfa0c0, __index = 0x24e6920}, row = {d = 0x0, ins = 0x1cfa0c0, upd = 0x24e6920, entries = 0}, col_fix = {

      recno = 0, bitf = 0x1cfa0c0 "\360:\373\001", entries = 38693152}, col_var = {recno = 0, d = 0x1cfa0c0, repeats = 0x24e6920, nrepeats = 0, entries = 0}}, 

  dsk = 0x1fb3c00, modify = 0x0, read_gen = 0, memory_footprint = 1254123, type = 6 '\006', flags_atomic = 2 '\002'}

(gdb) p *ref

$35 = {page = 0x0, home = 0x1fb3af0, ref_hint = 0, state = WT_REF_DISK, addr = 0x1fb3c2a, key = {recno = 4294967379, ikey = 0x100000053}, page_del = 0x0}