Backtrace:
/lib64/libc.so.6(gsignal+0x37)[0x7fa04249b1d7]
/lib64/libc.so.6(abort+0x148)[0x7fa04249c8c8]
build_posix/../src/os_common/os_strtouq.c:18(__wt_strtouq)[0x5301d1]
build_posix/../src/support/err.c:514(__wt_panic)[0x47cdec]
build_posix/../src/btree/bt_discard.c:100(__page_out_int)[0x4a9f87]
build_posix/../src/btree/bt_discard.c:61(__wt_ref_out_int)[0x4a9ec9]
build_posix/../src/btree/bt_discard.c:71(__wt_ref_out)[0x4a9ef3]
build_posix/../src/evict/evict_file.c:130(__wt_evict_file)[0x511a4b]
build_posix/../src/btree/bt_sync.c:424(__wt_cache_op)[0x4cfbb7]
build_posix/../src/txn/txn_ckpt.c:1760 (discriminator 1)(__wt_checkpoint_close)[0x493cff]
build_posix/../src/conn/conn_dhandle.c:253(__wt_conn_dhandle_close)[0x41a4ee]
build_posix/../src/conn/conn_dhandle.c:615(__conn_dhandle_close_one)[0x41b33a]
build_posix/../src/conn/conn_dhandle.c:657(__wt_conn_dhandle_close_all)[0x41b467]
build_posix/../src/schema/schema_worker.c:50 (discriminator 2)(__wt_schema_worker)[0x46d0ba]
build_posix/../src/session/session_api.c:1395 (discriminator 2)(__session_verify)[0x476622]
build_posix/test/format/../../../test/format/wts.c:561(wts_verify)[0x40fd0b]
build_posix/test/format/../../../test/format/t.c:205(main)[0x40b29f]