• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Weird system freeze
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Weird system freeze


  • Subject: Weird system freeze
  • From: Antoine Missout <email@hidden>
  • Date: Fri, 13 Apr 2012 11:25:13 -0400

Hi,

I've encountered an issue with our product Hands Off!.

We intercept the mac_socket_check_bind call, send a mach msg to our daemon to check if it's allowed. But for some reason, the daemon never wakes up to process it (why?). In the stackshot I was able to get, the only thread we're interfering with is the bind system call made by launchctl (when enabling the Apple File Server). Below are the relevant logs. A complete zip of the stackshot logs is available here:

http://www.metakine.com/files/ho_freeze12avr2012.zip

Looking at the bind source code, it's not clear to me what could lock everything else when blocking in it. This bug is hard to reproduce, doesn't always happen, and seems to be dependant on the network environment.

Any help would be greatly appreciated.

Thanks,
Antoine


-------------------------------------------------

PID: 328
    Process: launchctl
    Kernel stack:
    machine_switch_context (in mach_kernel) + 383 (0xffffff800022c888)
      thread_dispatch (in mach_kernel) + 1894 (0xffffff800020990e)
        thread_block_reason (in mach_kernel) + 289 (0xffffff8000209acb)
          ipc_mqueue_receive (in mach_kernel) + 65 (0xffffff8000203622)
            mach_msg_rpc_from_kernel_body (in mach_kernel) + 338 (0xffffff800020589f)
              0xffffff7f8099a72c (0xffffff7f8099a72c)
                0xffffff7f8099ebb0 (0xffffff7f8099ebb0)
                  0xffffff7f809a7681 (0xffffff7f809a7681)
                    bind (in mach_kernel) + 318 (0xffffff80004b45ea)
                      unix_syscall64 (in mach_kernel) + 544 (0xffffff80004e8168)
                        hndl_unix_scall64 (in mach_kernel) + 20 (0xffffff80002e4874)

PID: 67
    Process: HandsOffDaemon
    Continuation: ipc_mqueue_receive_continue (in mach_kernel) + 0 (0xffffff800026f302)
    Continuation: kevent (in mach_kernel) + 62 (0xffffff80004786e4)
    Continuation: semaphore_wait_continue (in mach_kernel) + 0 (0xffffff80002815d9)
    Continuation: ipc_mqueue_receive_continue (in mach_kernel) + 0 (0xffffff800026f302)
    Continuation: ipc_mqueue_receive_continue (in mach_kernel) + 0 (0xffffff800026f302)
    Kernel stack:
    machine_idle (in mach_kernel) + 210 (0xffffff800022e461)
      thread_setrun (in mach_kernel) + 1344 (0xffffff80002083a4)
        thread_go (in mach_kernel) + 2145 (0xffffff8000208fec)
          thread_block_reason (in mach_kernel) + 264 (0xffffff8000209ab2)
            ipc_mqueue_receive (in mach_kernel) + 58 (0xffffff800020361b)
              mach_msg_overwrite_trap (in mach_kernel) + 468 (0xffffff800027426a)
                get_user_regs (in mach_kernel) + 545 (0xffffff80002c2daa)
                  hndl_mach_scall (in mach_kernel) + 230 (0xffffff80002e4536)
    Continuation: ipc_mqueue_receive_continue (in mach_kernel) + 0 (0xffffff800026f302)
    Continuation: semaphore_wait_continue (in mach_kernel) + 0 (0xffffff80002815d9)
    Continuation: ipc_mqueue_receive_continue (in mach_kernel) + 0 (0xffffff800026f302)


 _______________________________________________
Do not post admin requests to the list. They will be ignored.
Darwin-kernel mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:

This email sent to email@hidden

  • Follow-Ups:
    • Re: Weird system freeze
      • From: Antoine Missout <email@hidden>
  • Prev by Date: mach_vm_region vs. vm_region_64
  • Next by Date: task_for_pid safely
  • Previous by thread: Re: mach_vm_region vs. vm_region_64
  • Next by thread: Re: Weird system freeze
  • Index(es):
    • Date
    • Thread