[Bug 1538049] Re: xenstore crashes with SIGBUS in domain_can_read()

[Stefan Bader]

Hm, when repeating with a xenstored that prints additional trace
messages about domain->interface values, I now got a case where the
SIGBUS seems to have happened while the interface pointer looks valid.

(gdb) where
#0  domain_can_read (conn=conn at entry=0x8eb890) at xenstored_domain.c:261
#1  0x0000000000402718 in main (argc=<optimized out>, argv=<optimized out>)
    at xenstored_core.c:2145
(gdb) p *((struct connection *) 0x8eb890)
$1 = {list = {next = 0x8eca60, prev = 0x8ecdf0}, fd = -1, pollfd_idx = -1, 
  id = 1, can_write = true, in = 0x8ef290, out_list = {next = 0x8eb8b8, 
    prev = 0x8eb8b8}, transaction = 0x0, transaction_list = {next = 0x8eb8d0, 
    prev = 0x8eb8d0}, next_transaction_id = 10, transaction_started = 0, 
  domain = 0x8eced0, target = 0x0, watches = {next = 0x8edd30, 
    prev = 0x8ee9a0}, write = 0x406140 <writechn>, read = 0x406240 <readchn>}
(gdb) p *((struct domain *) 0x8eced0)
$2 = {list = {next = 0x8e81b0, prev = 0x6145a0 <domains>}, domid = 1, 
  port = 48, remote_port = 1, mfn = 2173329, 
  path = 0x8ec460 "/local/domain/1", interface = 0x7fc8acb0f000, 
  conn = 0x8eb890, shutdown = 0, nbentry = 44, nbwatch = 9}

** Attachment added: "Log of xenstored with additional debugging enabled."
   https://bugs.launchpad.net/ubuntu/+source/xen/+bug/1538049/+attachment/4556767/+files/xenstored.log

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Title:
  xenstore crashes with SIGBUS in domain_can_read()

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