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Date: Thu, 15 Jan 2009 22:54:36 +0100 From: Ingo Molnar <mingo@...e.hu> To: Vegard Nossum <vegard.nossum@...il.com> Cc: linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, "Rafael J. Wysocki" <rjw@...k.pl>, Pekka Enberg <penberg@...helsinki.fi>, David Howells <dhowells@...hat.com>, Michael LeMay <mdlemay@...ch.ncsc.mil>, James Morris <jmorris@...ei.org>, Stephen Smalley <sds@...ho.nsa.gov>, Paul Moore <paul.moore@...com>, Eric Paris <eparis@...hat.com> Subject: Re: [slab corruption] BUG key_jar: Poison overwritten * Vegard Nossum <vegard.nossum@...il.com> wrote: > On Thu, Jan 15, 2009 at 10:01 PM, Ingo Molnar <mingo@...e.hu> wrote: > > > > * Vegard Nossum <vegard.nossum@...il.com> wrote: > > > >> On Thu, Jan 15, 2009 at 7:16 PM, Ingo Molnar <mingo@...e.hu> wrote: > >> > > >> > -tip testing found the rather scary looking slab corruption: > >> > > >> > [ 35.419875] CPU0 attaching sched-domain: > >> > [ 35.420101] domain 0: span 0-1 level CPU > >> > [ 35.425883] groups: 0 1 > >> > [ 35.428527] CPU1 attaching sched-domain: > >> > [ 35.432010] domain 0: span 0-1 level CPU > >> > [ 35.437729] groups: 1 0 > >> > [ 37.380005] eth0: no IPv6 routers present > >> > [ 44.478286] ============================================================================= > >> > [ 44.482064] BUG key_jar: Poison overwritten > >> > [ 44.482064] ----------------------------------------------------------------------------- > >> > [ 44.482064] > >> > [ 44.482064] INFO: 0xf5f320c0-0xf5f320c0. First byte 0x6a instead of 0x6b > >> > [ 44.482064] INFO: Allocated in key_alloc+0xe7/0x30e age=291 cpu=1 pid=2815 > >> > [ 44.482064] INFO: Freed in key_cleanup+0xd8/0xdd age=292 cpu=1 pid=2520 > >> > [ 44.482064] INFO: Slab 0xc1f9cfb8 objects=21 used=2 fp=0xf5f320c0 flags=0x400000c3 > >> > [ 44.482064] INFO: Object 0xf5f320c0 @offset=192 fp=0xf5f32240 > >> > [ 44.482064] > >> > [ 44.482064] Bytes b4 0xf5f320b0: 7c 05 ff ff 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a |.��ZZZZZZZZZZZZ > >> > [ 44.482064] Object 0xf5f320c0: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b jkkkkkkkkkkkkkkk > >> > [ 44.482064] Object 0xf5f320d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > >> > [ 44.482064] Object 0xf5f320e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > >> > [ 44.482064] Object 0xf5f320f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > >> > [ 44.482064] Object 0xf5f32100: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > >> > [ 44.482064] Object 0xf5f32110: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > >> > [ 44.482064] Object 0xf5f32120: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > >> > [ 44.482064] Object 0xf5f32130: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > >> > [ 44.482064] Object 0xf5f32140: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkk� > >> > [ 44.482064] Redzone 0xf5f3214c: bb bb bb bb ���� > >> > [ 44.482064] Padding 0xf5f32174: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZ > >> > [ 44.482064] Pid: 2832, comm: sudo Not tainted 2.6.29-rc1-tip-01097-gf5d0b1b-dirty #16445 > >> > [ 44.482064] Call Trace: > >> > [ 44.482064] [<c018e25c>] print_trailer+0xcd/0xd5 > >> > [ 44.482064] [<c018e2dc>] check_bytes_and_report+0x78/0x94 > >> > [ 44.482064] [<c018e55c>] check_object+0xa9/0x191 > >> > [ 44.482064] [<c018eff3>] __slab_alloc+0x365/0x42c > >> > [ 44.482064] [<c0144dda>] ? trace_hardirqs_off+0xb/0xd > >> > [ 44.482064] [<c018f369>] kmem_cache_alloc+0x64/0xc1 > >> > [ 44.482064] [<c02d040e>] ? key_alloc+0xe7/0x30e > >> > [ 44.482064] [<c02d040e>] ? key_alloc+0xe7/0x30e > >> > [ 44.482064] [<c02d040e>] key_alloc+0xe7/0x30e > >> > [ 44.482064] [<c02d1429>] keyring_alloc+0x24/0x58 > >> > [ 44.482064] [<c02d2781>] install_session_keyring_to_cred+0x43/0x92 > >> > [ 44.482064] [<c02d2d61>] lookup_user_key+0xe0/0x30b > >> > [ 44.482064] [<c02d17ab>] keyctl_get_keyring_ID+0x12/0x2e > >> > [ 44.482064] [<c02d22c2>] sys_keyctl+0x36/0xe3 > >> > [ 44.482064] [<c0102d55>] sysenter_do_call+0x12/0x35 > >> > [ 44.482064] FIX key_jar: Restoring 0xf5f320c0-0xf5f320c0=0x6b > >> > [ 44.482064] > >> > [ 44.482064] FIX key_jar: Marking all objects used > >> > > >> > Config attached. The system seemed to stay intact after this incident. > >> > >> > >> Are you sure this is the right config? > >> > >> # Security options > >> # > >> # CONFIG_KEYS is not set > >> > >> ...sys_keyctl() returns -ENOSYS...!? > > > > no, sorry. The right 'bad' config attached. > > Are you sure, is this expected? > > CC kernel/printk.o > cc1: warnings being treated as errors > arch/x86/kernel/cpu/intel_cacheinfo.c: In function 'show_cache_disable': > arch/x86/kernel/cpu/intel_cacheinfo.c:710: error: unused variable 'mask' > arch/x86/kernel/cpu/intel_cacheinfo.c: In function 'store_cache_disable': > arch/x86/kernel/cpu/intel_cacheinfo.c:745: error: unused variable 'mask' > make[2]: *** [arch/x86/kernel/cpu/intel_cacheinfo.o] Error 1 > make[1]: *** [arch/x86/kernel/cpu] Error 2 > make: *** [arch/x86/kernel] Error 2 > make: *** Waiting for unfinished jobs.... > > Will restart make with CONFIG_ALLOW_WARNINGS=y... yes, i had that off via a local patch. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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