[erlang-bugs] Unaligned memory access on sparc64

[David Coppa]

Hi all, 

There's an unaligned memory access into lib/erl_interface/src/connect/ei_resolve.c that causes a SIGBUS
crash on sparc64.

The following backtrace is from R13B04, but the code has not changed, so this bug is still present.

$ gdb erl_call /usr/ports/pobj/rabbitmq-2.5.0/rabbitmq-server-2.5.0/erl_call.core
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This GDB was configured as "sparc64-unknown-openbsd4.9"...
Core was generated by `erl_call'.
Program terminated with signal 10, Bus error.
Reading symbols from /usr/lib/libpthread.so.13.1...done.
Loaded symbols for /usr/lib/libpthread.so.13.1
Reading symbols from /usr/lib/libc.so.58.3...done.
Loaded symbols for /usr/lib/libc.so.58.3
Reading symbols from /usr/libexec/ld.so...done.
Loaded symbols for /usr/libexec/ld.so
#0  0x000000000010d32c in copy_hostent (dest=0xfffffffffffce780, src=0x20fc2d8c0, buffer=0xfffffffffffce9ac "", buflen=996) at connect/ei_resolve.c:224
224	    *pptr = src_aliases;
(gdb) bt
#0  0x000000000010d32c in copy_hostent (dest=0xfffffffffffce780, src=0x20fc2d8c0, buffer=0xfffffffffffce9ac "", buflen=996) at connect/ei_resolve.c:224
#1  0x000000000010d790 in my_gethostbyname_r (name=0xfffffffffffcfa1f "vulcan", hostp=0xfffffffffffce950, buffer=0xfffffffffffce990 "vulcan.*****.*******.***", buflen=1024, h_errnop=0xfffffffffffce98c) at connect/ei_resolve.c:319
#2  0x000000000010db18 in ei_gethostbyname_r (name=0xfffffffffffcfa1f "vulcan", hostp=0xfffffffffffce950, buffer=0xfffffffffffce990 "vulcan.*****.*******.***", buflen=1024, h_errnop=0xfffffffffffce98c) at connect/ei_resolve.c:629
#3  0x0000000000108580 in ei_connect_tmo (ec=0xfffffffffffcf4fc, nodename=0xfffffffffffcfa10 "rabbitmq-check@REDACTED", ms=0) at connect/ei_connect.c:604
#4  0x00000000001087e8 in ei_connect (ec=0xfffffffffffcf4fc, nodename=0xfffffffffffcfa10 "rabbitmq-check@REDACTED") at connect/ei_connect.c:659
#5  0x00000000001046e8 in main (argc=5, argv=0xfffffffffffcfc88) at prog/erl_call.c:384
(gdb) thread apply all bt full

Thread 1 (process 26785):
#0  0x000000000010d32c in copy_hostent (dest=0xfffffffffffce780, src=0x20fc2d8c0, buffer=0xfffffffffffce9ac "", buflen=996) at connect/ei_resolve.c:224
	pptr = (char **) 0xfffffffffffce9ac
	len = 24
	src_aliases = (char **) 0x20fc2d8e0
	src_addr_list = (char **) 0x0
#1  0x000000000010d790 in my_gethostbyname_r (name=0xfffffffffffcfa1f "vulcan", hostp=0xfffffffffffce950, buffer=0xfffffffffffce990 "vulcan.*****.*******.***", buflen=1024, h_errnop=0xfffffffffffce98c) at connect/ei_resolve.c:319
	dest = {h_name = 0xfffffffffffce990 "vulcan.*****.*******.***", h_aliases = 0xfffffffffffce9ac, h_addrtype = 2, h_length = 4, h_addr_list = 0x21fb20}
	src = (struct hostent *) 0x20fc2d8c0
	rval = (struct hostent *) 0x0
#2  0x000000000010db18 in ei_gethostbyname_r (name=0xfffffffffffcfa1f "vulcan", hostp=0xfffffffffffce950, buffer=0xfffffffffffce990 "vulcan.*****.*******.***", buflen=1024, h_errnop=0xfffffffffffce98c) at connect/ei_resolve.c:629
No locals.
#3  0x0000000000108580 in ei_connect_tmo (ec=0xfffffffffffcf4fc, nodename=0xfffffffffffcfa10 "rabbitmq-check@REDACTED", ms=0) at connect/ei_connect.c:604
	hostname = 0xfffffffffffcfa1f "vulcan"
	alivename = "rabbitmq-check\000\000?????????\r\027?\205?qqeck/.erlang.cookie", '\0' <repeats 11 times>, "\200\000\005???????!?\r\027?\207\003\035?\000\000\000\002\rq\001@", '\0' <repeats 21 times>, "r7\210\000\000\000\000\000\000\001E\000\000\000\000\000\000\000\003\000\000\000\000\000\000\000\001\000\000\000\000\000\000*?\000\000\000\000\000\000??\000\000\000\002\017?E\000\000\000\000\002\017?\024?\000\000\000\002\017q!\020\000\000\000\002\017??????????x", '\0' <repeats 11 times>, "\002\017????????"...
	hp = (struct hostent *) 0x20f550000
	host = {h_name = 0x20dfe3408 "", h_aliases = 0x200000000, h_addrtype = 2, h_length = 257275424, h_addr_list = 0x20f550000}
	buffer = "vulcan.*****.*******.***\000\000\000\000\000=*?\000\000\000\001\000\000\002=???????@\000\000\000\000N\003zm", '\0' <repeats 12 times>, "N\003zm\000\000\000\000\000\001?\017", '\0' <repeats 11 times>, "\002\017U\000\000\000\000\000\000\000\020/\200", '\0' <repeats 14 times>, "\004?\000\000\000\002\rP?", '\0' <repeats 12 times>, "\002\017?E", '\0' <repeats 12 times>, "\002\017?\026P\000\000\000\000\000\000\002\000\000\000\000\002\017?\026P\000\000\000\002\rP?\000\000\000\000\000\000\"\0050???????1?\r\027?\205?i????"...
	ei_h_errno = -202726
#4  0x00000000001087e8 in ei_connect (ec=0xfffffffffffcf4fc, nodename=0xfffffffffffcfa10 "rabbitmq-check@REDACTED") at connect/ei_connect.c:659
No locals.
#5  0x00000000001046e8 in main (argc=5, argv=0xfffffffffffcfc88) at prog/erl_call.c:384
	i = 17
	fd = 80
	creation = 1
	hp = (struct hostent *) 0x20fc2d8c0
	host_name = "vulcan\000\030\000\000\000\000\0002 \000???????A?\r\027?\212??5\000\000\000\a\000\000\000\f???????8\000\000\000\002\rP\000\000\000\000\000\000\000\000\000\000"
	nodename = "rabbitmq-check@REDACTED\000??\000\000\000\000\000\000\000\000???????\201?\r\027?\212??\005???????\201?\r\027?\212??\005", '\0' <repeats 21 times>, "/??", '\0' <repeats 11 times>, "\002\r???\000\000\000\002\r???\000\000\000\000\000\"`\000\000\000\000\000\000\000 \000"
	p = 0x0
	ct = 0x20fc2da0d ".*****.*******.***"
	modsize = 0
	host = 0xfffffffffffcfae0 "vulcan"
	module = 0x0
	modname = 0x0
	flags = {startp = 0, cookiep = 0, modp = 0, evalp = 1, randomp = 0, use_long_name = 0, debugp = 0, verbosep = 0, haltp = 1, cookie = 0x0, node = 0x20d7107c0 "rabbitmq-check", hidden = 0x20d710f70 "c17", apply = 0x0, script = 0x0}
	progname = 0xfffffffffffcfe78 "erl_call"
	ec = {
  thishostname = "vulcan\000\000\000\000\000\000\000\000\000\002\r??\000\000\000\000\000\000/??\000\000\000\000\0001?\200\000\000\000\000\000\000\000\214\000\000\000\000\000\000\a\020\000\000\000\002\016_?8\000\000\000\002\016", 
  thisnodename = "c17@REDACTED\000?\r\027?\207??U???????\221?\r\027?\207\002?\005\000\000\000\000\000\000\000\034??????? ???????\f", '\0' <repeats 11 times>, "\002\rP\026", '\0' <repeats 12 times>, "\002\rP0\000\000\000\000\000\rP0\000\000\000\000\002\rP0\000\000\000\000\000\rP0", '\0' <repeats 12 times>, "\002\016\037", 
  thisalivename = "c17\000\000\002\rP?\000\000\000\000\002\016\037?\030\000\000\000\000\000\000\002\000\000\000\000\002\016O? ", '\0' <repeats 15 times>, "\002\000\000\000\002\r?u@\000\000\000\000\000", 
  ei_connect_cookie = "OZMRLUAHORQAALOCKXDN\000????Q?\r\027?\207\002?i\000\000\000\a\000/??\000\000\000\000\0001??\000\000\000\000\000\000\000\004\000\000\000\000\000\000 ", '\0' <repeats 11 times>, "\a?\000\000\b\000\000\000\000\002\016\037?\034\000\000\000\002\016\037? \000\000\000\002\016`5?\000\000\000\000\000\000\001?\000\000\000\002\016`5?", '\0' <repeats 19 times>, "\002\016O? \000\000\000\000\000r5\200\000\000\000\002\016\037? \000\000\000\002\016`5?\000\000\000\000\000\000\001?\000\000\000\002\016`5?", '\0' <repeats 19 times>, "\002\017?E\000\000\000\000\002\017\201?@", '\0' <repeats 40 times>..., creation = 1, self = {
    node = "c17@REDACTED\000?\000\000\000\000\000/??\000\000\000\000\000\000\001?\000\000\000\002\017UP?\000\000\000\002\017U\000\000\000\000\000\002\017WA0\000\000\000\002\017U\000\000????????\000\000\000\002\017V0J\000\000\000\000\000\000\000\003\000\000\000\002\r??\000\000\000\000\000\000/?P\000\000\000\000\000<??\000\000\000\000\000\000\000\177\000\000\000\002\017W^?\000\000\000\000\000/?P\000\000\000\000\000\000\000\000?????????\r\027?\207??U", '\0' <repeats 16 times>, "????????\000\000\000\002\r???", '\0' <repeats 16 times>, "????????"..., num = 0, serial = 0, creation = 1}}

Cheers! 
David Coppa