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Posted to bugs@httpd.apache.org by bu...@apache.org on 2007/04/12 17:21:15 UTC
DO NOT REPLY [Bug 42101] New: - SSL SHM cache dies with bus errors on sparc when compiled with Sun CC
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Summary: SSL SHM cache dies with bus errors on sparc when
compiled with Sun CC
Product: Apache httpd-2
Version: 2.2.4
Platform: Other
OS/Version: other
Status: NEW
Severity: normal
Priority: P2
Component: mod_ssl
AssignedTo: bugs@httpd.apache.org
ReportedBy: alex.kiernan@gmail.com
Using Sun CC (Sun C 5.8 Patch 121015-04 2007/01/10) using these options:
-fast -g -xs -v -xstrconst -xtarget=ultra3 -xarch=v8plusa
At line 1221 of ssl_scache_shmcb.c in Apache 2.2.24 we get a bus error. The
problem is that given this struct:
typedef struct {
time_t expires;
unsigned int offset;
unsigned char s_id2;
unsigned char removed;
} SHMCBIndex;
Which is stored in shared memory at offset 0xfe42afba (the idx variable)
For the code:
(idx->s_id2 == id[1]) && !idx->removed
the compiler generates
ld [%l2 + 8], %o0
(i.e. add 8 to %l2, dereference it and store the result in %o0)
in order to retrieve s_id2 and removed in one operation, only %l2 isn't
naturally aligned so you get a bus error.
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DO NOT REPLY [Bug 42101] - SSL shmcb cache dies with bus errors on sparc when compiled with Sun CC
Posted by bu...@apache.org.
DO NOT REPLY TO THIS EMAIL, BUT PLEASE POST YOUR BUG�
RELATED COMMENTS THROUGH THE WEB INTERFACE AVAILABLE AT
<http://issues.apache.org/bugzilla/show_bug.cgi?id=42101>.
ANY REPLY MADE TO THIS MESSAGE WILL NOT BE COLLECTED AND�
INSERTED IN THE BUG DATABASE.
http://issues.apache.org/bugzilla/show_bug.cgi?id=42101
jorton@redhat.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|SSL SHM cache dies with bus |SSL shmcb cache dies with
|errors on sparc when |bus errors on sparc when
|compiled with Sun CC |compiled with Sun CC
------- Additional Comments From jorton@redhat.com 2007-04-24 02:59 -------
Nice work tracking this down, thanks. It probably needs more _safe_ wrapper
functions to avoid this (if possible).
The trunk version of shmcb has been rewritten to avoid alignment issues; it
should be possible to drop this in as a replacement: any results from testing
very welcome:
http://svn.apache.org/viewvc/httpd/httpd/trunk/modules/ssl/ssl_scache_shmcb.c?revision=420983
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