ASAN:DEADLYSIGNAL
=================================================================
==22518==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000014 (pc 0x000000827702 bp 0x7f56f14e1c90 sp 0x7f56f14e1ac0 T92)
==22518==The signal is caused by a READ memory access.
==22518==Hint: address points to the zero page.
    #0 0x827701 in __wt_delete_page_rollback /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_delete.c:194:39
    #1 0x7aabf8 in __wt_txn_rollback /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/txn/txn.c:1172:4
    #2 0x72a4e4 in __session_rollback_transaction /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/session/session_api.c:1765:2
    #3 0x537cfb in rollback_transaction /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:609:2
    #4 0x528c61 in ops /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:1121:4
    #5 0x7f56ffeacdc4 in start_thread /usr/src/debug/glibc-2.17-c758a686/nptl/pthread_create.c:308
    #6 0x7f56ff09376c in __clone (/lib64/libc.so.6+0xf776c)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_delete.c:194:39 in __wt_delete_page_rollback
Thread T92 created by T0 here:
    #0 0x437571 in pthread_create /home/bostic/src/llvm40/projects/compiler-rt/lib/asan/asan_interceptors.cc:305
    #1 0x660e80 in __wt_thread_create /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/os_posix/os_thread.c:30:2
    #2 0x522d9f in wts_ops /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:162:3
    #3 0x53c4c2 in main /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/t.c:210:5
    #4 0x7f56fefbdb34 in __libc_start_main /usr/src/debug/glibc-2.17-c758a686/csu/../csu/libc-start.c:274

==22518==ABORTING