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: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected], [email protected]
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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