On rebooting a hvm, the blktapctrl daemon has died.
gdb shows the following call trace:
(gdb) where
#0 0x00000039d1830155 in raise () from /lib64/libc.so.6
#1 0x00000039d1831bf0 in abort () from /lib64/libc.so.6
#2 0x00000039d186a38b in __libc_message () from /lib64/libc.so.6
#3 0x00000039d1871634 in _int_free () from /lib64/libc.so.6
#4 0x00000039d1874c5c in free () from /lib64/libc.so.6
#5 0x0000003320a01bdd in ueblktap_probe (h=0x6073b0,
w=<value optimized out>, bepath_im=<value optimized out>) at
xenbus.c:270
#6 0x0000003320a020e0 in xs_fire_next_watch (h=0x6073b0) at
xs_api.c:355
#7 0x0000000000401785 in main (argc=<value optimized out>,
argv=<value optimized out>) at blktapctrl.c:907
There is a case that "/local/domain/0/backend/tap/<dom_id>"
exists but
"/local/domain/<dom_id>/vm" is not in the xenstore.
Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>
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