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  1. Traffic Server
  2. TS-4844

Crash in HttpSM::state_cache_open_write

    Details

    • Type: Bug
    • Status: Open
    • Priority: Blocker
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: 7.1.0
    • Component/s: HTTP
    • Labels:

      Description

      We're seeing this crash, particularly (maybe even only) when we reload configurations on a running system:

      #0  0x00002aaaaac8d08d in HttpSM::state_cache_open_write (this=0x2ae4964b4600, event=1109, data=0x2ae993968000) at HttpSM.cc:2503
      #1  0x00002aaaaac9da9d in HttpSM::main_handler (this=0x2ae4964b4600, event=1109, data=0x2ae993968000) at HttpSM.cc:2661
      #2  0x00002aaaaae8c650 in Continuation::handleEvent (data=0x2ae993968000, event=1109, this=<optimized out>) at I_Continuation.h:153
      #3  EThread::process_event (this=0x2aaab3208000, e=0x2ae993968000, calling_code=1109) at UnixEThread.cc:148
      #4  0x00002aaaaae8d47b in EThread::execute (this=0x2aaab3208000) at UnixEThread.cc:202
      #5  0x00002aaaaae8c026 in spawn_thread_internal (a=0x2aaab0b25dc0) at Thread.cc:86
      #6  0x00002aaaad6b3aa1 in start_thread (arg=0x2aaab480f700) at pthread_create.c:301
      #7  0x00002aaaae8bc93d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115
      

      Discussed with amc about what this could be, looking at the code, it seems related to the "new" option proxy.config.http.cache.open_write_fail_action. We've started turning off this setting for now.

      The root cause of the crash is

      (gdb) p cache_sm.cache_read_vc
      $1 = (CacheVConnection *) 0x0
      

      I.e. we end up in the CACHE_EVENT_OPEN_READ case, falling through from CACHE_EVENT_OPEN_WRITE_FAILED (which is the value of event):

      (gdb) p event
      $2 = 1109
      

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            • Assignee:
              Unassigned
              Reporter:
              zwoop Leif Hedstrom
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              Dates

              • Created:
                Updated: