[tor-bugs] #10201 [Tor bundles/installation]: Firefox ESR 24 sometimes hangs during exit on Mac OS

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#10201: Firefox ESR 24 sometimes hangs during exit on Mac OS
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 Reporter:  mcs                       |          Owner:  erinn
     Type:  defect                    |         Status:  new
 Priority:  normal                    |      Milestone:
Component:  Tor bundles/installation  |        Version:
 Keywords:                            |  Actual Points:
Parent ID:  #10103                    |         Points:
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 Kathy Brade and I have observed frequent hangs during exit on Mac OS
 10.8.5 with our own ESR 24 Tor Browser builds as well as a recent build
 supplied by gk.  We are not sure what triggers the hang, but it occurs
 often after loading a few web pages in the browser.

 Activity Monitor shows that TorBrowser is consuming 100% CPU.  dtrace
 shows this series of system calls repeated over and over:

 write(0x9, "8\a\0", 0x1)         = 1 0
 write(0x9, "8\a\0", 0x1)         = 1 0
 select(0x9, 0xB0288B20, 0xB0288AA0, 0xB0288A20, 0xB0288A18)         = 1 0
 read(0x8, "88\0", 0x400)         = 2 0

 lsof shows that file descriptors 8 and 9 are pipes:

 firefox 65737 brade    8     PIPE 0xffffff804948f210     16384
 ->0xffffff8049491e10
 firefox 65737 brade    9     PIPE 0xffffff8049491e10     16384
 ->0xffffff804948f210

 So it looks like the firefox process is repeatedly writing to and reading
 the same data from a pipe.  I am not sure what the significance of '8'
 is....

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10201>
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