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sigterm
2012 Jul 04
1
NOTICE: Data corruption bug when writing to qcow2 files
...(i) qemu had a bug where it would segfault when you sent it a
SIGTERM signal. It turned out that where qemu was writing to a
qcow2 file, and the qcow2 writeback cache is enabled [NB:
cache=none enables this cache], and write requests were in
flight at the point when the SIGERM is received, it would crash.
** This bug has been fixed in qemu/qemu-kvm >= 1.1.0. It is highly
** recommended that you immediately upgrade to this version, not
** just for libguestfs but for all usage.
(ii) The Linux kernel sync(2) system call doesn't issue a write
barrie...