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[Bug runtime/5637] Misaligned accesses in staprun for ia64 when stapio access denied
- From: "wcohen at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 17 Jan 2008 23:40:14 -0000
- Subject: [Bug runtime/5637] Misaligned accesses in staprun for ia64 when stapio access denied
- References: <20080117232352.5637.wcohen@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From wcohen at redhat dot com 2008-01-17 23:40 -------
When running the systemtap snapshot checkout 20080117 on ia64 attempt to run
test with following command:
sudo runtest --tool_opts install --tool systemtap --srcdir
/home/wcohen/stap_snap_200801141333/src/testsuite systemtap.syscall/syscall.exp
Noticed that there were reports of misaligned accesses when the tests failed:
Testing 64-bit access
Executing on host: gcc /home/wcohen/stap_snap_200801141333/src/testsuite/systemt
ap.syscall/access.c -lm -o /tmp/staptest15375/access (timeout = 300)
access FAILED. output of "stap -c /tmp/staptest15375/access /home/wcohen/stap_sn
ap_200801141333/src/testsuite/systemtap.syscall/sys.stp" was:
------------------------------------------
/home/wcohen/stap_testing_200801171833/install/libexec/systemtap/stapio: Permiss
ion denied
See in the log the following:
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c884, ip=0x400000000000b7d0
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c87c, ip=0x400000000000b7e1
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c88c, ip=0x400000000000b7f0
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c894, ip=0x400000000000b800
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c89c, ip=0x400000000000b810
The ip address in the code match up to est15375/access (timeout = 300)
access FAILED. output of "stap -c /tmp/staptest15375/access /home/wcohen/stap_sn
ap_200801141333/src/testsuite/systemtap.syscall/sys.stp" was:
------------------------------------------
/home/wcohen/stap_testing_200801171833/install/libexec/systemtap/stapio: Permiss
ion denied
See in the log the following:
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c884, ip=0x400000000000b7d0
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c87c, ip=0x400000000000b7e1
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c88c, ip=0x400000000000b7f0
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c894, ip=0x400000000000b800
Jan 17 17:52:44 squidward kernel: staprun(16356): unaligned access to
0x200000000235c89c, ip=0x400000000000b810
The ip address in the code match up to lines 52 and 55 in symbols.c
/* Initialize mod. */
memset(mod, 0, sizeof(struct _stp_module)); /* misaligned here */
/* Copy name in and check for overflow. */
strncpy(mod->name, name, STP_MODULE_NAME_LEN); /* misaligned here */
1) Should root be able to run or does root need to be added to /etc/groups?
2) If root can't run stapio, then staprun be more graceful and not create
unaligned accesses?
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |minor
Summary|Misaligned accesses in |Misaligned accesses in
|staprun for ia64 |staprun for ia64 when
| |stapio access denied
http://sourceware.org/bugzilla/show_bug.cgi?id=5637
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