This happend the after weaking up from suspend to disk with 2.6.29-16.fc11.i586, after a few minutes of work I got an oops (http://www.kerneloops.org/submitresult.php?number=318177) ============================================================================= BUG cred_jar (Not tainted): Poison overwritten ----------------------------------------------------------------------------- INFO: 0xf66bec00-0xf66bec1f. First byte 0x0 instead of 0x6b INFO: Allocated in prepare_creds+0x31/0x9b age=22708 cpu=1 pid=17059 INFO: Freed in put_cred_rcu+0x69/0x70 age=22681 cpu=0 pid=0 INFO: Slab 0xc1f94488 objects=21 used=16 fp=0xf66bec00 flags=0x400000c3 INFO: Object 0xf66bec00 @offset=3072 fp=0xf66be600 Bytes b4 0xf66bebf0: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ Object 0xf66bec00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object 0xf66bec10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object 0xf66bec20: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object 0xf66bec30: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object 0xf66bec40: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object 0xf66bec50: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object 0xf66bec60: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkk� Redzone 0xf66bec6c: bb bb bb bb ���� Padding 0xf66bec94: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ Padding 0xf66beca4: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ Padding 0xf66becb4: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZ Pid: 2742, comm: plasma Not tainted 2.6.29-16.fc11.i586 #1 Call Trace: [<c04a357e>] print_trailer+0xe5/0xed [<c04a3890>] check_bytes_and_report+0x91/0xb4 [<c04a3992>] check_object+0xaa/0x164 [<c04a4809>] __slab_alloc+0x325/0x41a [<c04a4bb9>] kmem_cache_alloc+0x8c/0x100 [<c044735c>] ? prepare_creds+0x31/0x9b [<c044735c>] ? prepare_creds+0x31/0x9b [<c044735c>] prepare_creds+0x31/0x9b [<c04a9a3b>] sys_faccessat+0x33/0x16e [<c04a9b8b>] sys_access+0x15/0x17 [<c0403f92>] syscall_call+0x7/0xb FIX cred_jar: Restoring 0xf66bec00-0xf66bec1f=0x6b FIX cred_jar: Marking all objects used
It looks like memory corruption, but I have no idea what might cause it to happen. How reproducible is this?
Haven't seen it for some time now - quite likely its already fixed. I also experienced a lot of problems with Intel's GEM when I saw that problem, so maybe there is/was a releation.
Clemens, does the problem still exist? please re-open this bug if it's still reproducible in the latest upstream kernel.