(gdb) bt full
#0  is_live (this=0x2b40606c1fe8) at MIME.h:126
No locals.
#1  unmarshal (offset=offset@entry=47555495334208, this=0x2b4060681238) at MIME.cc:3570
        field = 0x2b40606c1fe8
        index = 8301
#2  MIMEHdrImpl::unmarshal (this=this@entry=0x2b40606811f8, offset=offset@entry=47555495334208) at MIME.cc:3650
No locals.
#3  0x000000000065687b in HdrHeap::unmarshal (this=this@entry=0x2b4060681140, buf_length=buf_length@entry=4016, obj_type=obj_type@entry=3, found_obj=found_obj@entry=0x2b40a9e84b80, block_ref=block_ref@entry=0x2b40381198f0) at HdrHeap.cc:943
        obj = 0x2b40606811f8
        unmarshal_size = <optimized out>
        obj_data = 0x2b40606811f8 "\004P\002"
        offset = 47555495334208
#4  0x000000000065393d in HTTPInfo::unmarshal (buf=buf@entry=0x2b4060681048 "\355\336ͫ", len=4016, len@entry=4264, block_ref=0x2b40381198f0) at HTTP.cc:2043
        alt = 0x2b4060681048
        heap = 0x2b4060681140
        hh = 0x2b40606811c8
        tmp = <optimized out>
        orig_len = <optimized out>
#5  0x00000000006ca769 in unmarshal_helper (doc=doc@entry=0x2b4060681000, buf=..., okay=@0x2b40a9e84c90: 1) at Cache.cc:2206
        r = <optimized out>
        tmp = 0x2b4060681048 "\355\336ͫ"
        len = 4264
#6  0x00000000006d3834 in CacheVC::handleReadDone (this=0x2b40c81a1320, event=<optimized out>, e=<optimized out>) at Cache.cc:2403
        okay = 1
        http_copy_hdr = false
        lock = {m = {m_ptr = 0x2b42e40a8310}, lock_acquired = true}
        doc = 0x2b4060681000
        __FUNCTION__ = "handleReadDone"
#7  0x000000000068dac3 in handleEvent (data=<optimized out>, event=3900, this=<optimized out>) at ../../iocore/eventsystem/I_Continuation.h:153
No locals.
#8  AIOCallbackInternal::io_complete (this=<optimized out>, event=<optimized out>, data=<optimized out>) at ../../iocore/aio/P_AIO.h:117
No locals.
#9  0x0000000000761db0 in handleEvent (data=0x2b42e4085500, event=1, this=<optimized out>) at I_Continuation.h:153
No locals.
#10 EThread::process_event (this=0x2b40a6d55010, e=0x2b42e4085500, calling_code=1) at UnixEThread.cc:148
        c_temp = <optimized out>
        lock = {m = {m_ptr = 0x136ca720}, lock_acquired = true}
#11 0x0000000000762a6b in EThread::execute (this=0x2b40a6d55010) at UnixEThread.cc:202
        done_one = <optimized out>
        e = <optimized out>
        NegativeQueue = {<DLL<Event, Event::Link_link>> = {head = 0x1575c40}, tail = 0x1575c40}
        next_time = 1490510593008204010
---Type <return> to continue, or q <return> to quit---
#12 0x000000000076183a in spawn_thread_internal (a=0x1238c4b0) at Thread.cc:86
        p = 0x1238c4b0
#13 0x00002b3fe9d54dc5 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#14 0x00002b3feadec21d in clone () from /lib64/libc.so.6