I have learned that the following is useful for debugging "scheduling while
atomic" bugs. The respective files are attached:

$ sudo sh -c "echo 1 > /sys/kernel/debug/tracing/options/latency-format"
$ sudo sh -c "echo 1 > /sys/kernel/debug/tracing/tracing_enabled"
$ sudo sh -c "echo 1 > /sys/kernel/debug/tracing/tracing_on"
$ sudo sh -c "echo function > /sys/kernel/debug/tracing/current_tracer"

(reproduced bug)

$ bzip2 -c /sys/kernel/debug/tracing/trace > trace.bz2
$ dmesg | bzip2 > dmesg.bz2

** Attachment added: "dmesg output after reproducing bug"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/687599/+attachment/1788176/+files/dmesg.bz2

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https://bugs.launchpad.net/bugs/687599

Title:
  BUG: Scheduling while atomic in fuse_notify_inval_entry

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