On Thu, Feb 28, 2013 at 11:03:58AM -0500, Sasha Levin wrote: > Hi Greg, > > While fuzzing with trinity inside a KVM tools guest, running latest -next kernel > I got the following spew. > > The open() and release() callbacks in the traces below point to fs/sysfs/bin.c. Any hint as to which sysfs binary file you were accessing when this happened? > [ 719.288925] ============================================================================= > [ 719.290663] BUG kmalloc-4096 (Tainted: G W ): Redzone overwritten > [ 719.291764] ----------------------------------------------------------------------------- > [ 719.291764] > [ 719.294527] Disabling lock debugging due to kernel taint > [ 719.294527] INFO: 0xffff88006d1a5520-0xffff88006d1a5520. First byte 0x0 instead of 0xcc > [ 719.294527] INFO: Allocated in open+0xb8/0x190 age=18922 cpu=1 pid=7095 > [ 719.294527] __slab_alloc+0x622/0x6d0 > [ 719.294527] kmem_cache_alloc_trace+0x123/0x2c0 > [ 719.294527] open+0xb8/0x190 > [ 719.294527] do_dentry_open+0x229/0x330 > [ 719.294527] finish_open+0x54/0x70 > [ 719.294527] do_last+0x56c/0x790 > [ 719.294527] path_openat+0xbe/0x490 > [ 719.294527] do_filp_open+0x44/0xa0 > [ 719.294527] do_sys_open+0x133/0x1d0 > [ 719.294527] sys_open+0x1c/0x20 > [ 719.294527] tracesys+0xdd/0xe2 > [ 719.294527] INFO: Freed in seq_release+0x18/0x30 age=18947 cpu=0 pid=31203 > [ 719.294527] __slab_free+0x3c/0x590 > [ 719.294527] kfree+0x2cb/0x2e0 > [ 719.294527] seq_release+0x18/0x30 > [ 719.294527] single_release+0x24/0x40 > [ 719.294527] proc_reg_release+0xed/0x110 > [ 719.294527] __fput+0x122/0x2d0 > [ 719.294527] ____fput+0x9/0x10 > [ 719.294527] task_work_run+0xbe/0x100 > [ 719.294527] do_notify_resume+0x7e/0xa0 > [ 719.294527] int_signal+0x12/0x17 > [ 719.294527] INFO: Slab 0xffffea0001b46800 objects=7 used=7 fp=0x (null) flags=0x1ffc0000004081 > [ 719.294527] INFO: Object 0xffff88006d1a4520 @offset=17696 fp=0x (null) Hm, where is sysfs in this traceback? I don't see it mentioned anywhere in this report, what am I missing? thanks, greg k-h -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>