[Xfce-bugs] [Bug 13729] New: Thunar process hangs on poll() when trying to unmount USB storage

[bugzilla-daemon at xfce.org]

https://bugzilla.xfce.org/show_bug.cgi?id=13729

            Bug ID: 13729
           Summary: Thunar process hangs on poll() when trying to unmount
                    USB storage
    Classification: Xfce Core
           Product: Thunar
           Version: 1.6.11
          Hardware: PC (x86_64)
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Medium
         Component: General
          Assignee: xfce-bugs at xfce.org
          Reporter: mrsam at courier-mta.com
        QA Contact: nick at xfce.org
                CC: benny at xfce.org, hjudt at xfce.org
  Target Milestone: 1.8.0

Thunar 1.6.11, Fedora 26.

A request to unmount a mounted USB storage volume results in the following
strace of the thunar process:

eventfd2(0, EFD_CLOEXEC|EFD_NONBLOCK)   = 17
futex(0x7fd7fe8f6218, FUTEX_WAIT_PRIVATE, 2, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0x7fd7fe8f6218, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x560aed102fb0, FUTEX_WAKE_PRIVATE, 1) = 0
write(9, "\1\0\0\0\0\0\0\0", 8)         = 8
futex(0x560aed100380, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x560aed1000a0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x560aed0f80a8, FUTEX_WAKE_PRIVATE, 1) = 1
poll([{fd=17, events=POLLIN}], 1, 25000 <unfinished ...>) = ?

Thunar creates a new event file descriptor, and get stuck poll()ing it.

Someone else, with a lot more patience than me, captured a fuller strace that
shows multiple instances of this pattern repeated (multiple poll() timeouts,
with each one taking 25 seconds). More info here:

https://bugzilla.redhat.com/show_bug.cgi?id=1469789

Specifically here:

https://bugzilla.redhat.com/attachment.cgi?id=1302303

Eventually Thunar does succeed in unmounting the volume, but this apparently
take many, many minutes, for all of these poll()s to time out. Until it's over,
Thunar is completely dead in the water, and does not respond to any X events.

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