FYI, This was a debugging kernel (preempt, slab debugging, lockdep etc. enabled) running autotest and some other load on a 4 core Opteron system There was also another lockdep warning before that which I'm sending separately. Looks like some memory corruption. Could be something else, but at least reiserfs is the messenger. BTW these kind of backtraces are a good example on why I want the dwarf2 unwinder back. -Andi ------------[ cut here ]------------ kernel BUG at /mnt/dm-2/newautoboot/autoboot/lsrc/mainline/linux/mm/slab.c:2380! invalid opcode: 0000 [1] PREEMPT SMP CPU 0 Modules linked in: Pid: 12205, comm: find Not tainted 2.6.21-rc5-git6 #44 RIP: 0010:[<ffffffff8027b89d>] [<ffffffff8027b89d>] cache_alloc_refill+0xe6/0x22a RSP: 0018:ffff810078be7a28 EFLAGS: 00010002 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff8027b826 RDX: 0000000000000003 RSI: ffff81017d077000 RDI: ffff8100f7f7c540 RBP: ffff81017d077000 R08: ffff8100f7f7ec78 R09: ffff8101fa6cf178 R10: ffff810100116070 R11: 0000000000000000 R12: ffff810100116070 R13: ffff8100f7f7ec78 R14: ffff8100f7f7c540 R15: 000000000000000c FS: 00002acc1ce646d0(0000) GS:ffffffff8074a000(0000) knlGS:000000005b3f2b90 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000043d45000 CR3: 0000000088a9b000 CR4: 00000000000006e0 Process find (pid: 12205, threadinfo ffff810078be6000, task ffff81002a76d0c0) Stack: 00000001000000d0 ffff8101002b6248 ffff8100f7f7c540 0000000000000246 00000000000000d0 ffffffff802ce4cb ffffffff802c7590 ffffffff8027bda3 ffff8101002b6248 0000000000000000 ffff8100070a9988 ffff8101002b6248 Call Trace: [<ffffffff802ce4cb>] reiserfs_alloc_inode+0x15/0x2a [<ffffffff802c7590>] reiserfs_find_actor+0x0/0x1b [<ffffffff8027bda3>] kmem_cache_alloc+0x8c/0xe2 [<ffffffff802ce4cb>] reiserfs_alloc_inode+0x15/0x2a [<ffffffff802925c9>] alloc_inode+0x12/0x13f [<ffffffff8029289d>] iget5_locked+0x5a/0x18a [<ffffffff802c757e>] reiserfs_init_locked_inode+0x0/0x12 [<ffffffff802c54a0>] reiserfs_iget+0x30/0x92 [<ffffffff802d5079>] pathrelse+0x24/0x3c [<ffffffff802c2a11>] reiserfs_lookup+0xcf/0x138 [<ffffffff80557303>] _read_trylock+0x47/0x6b [<ffffffff80290b6e>] d_alloc+0x1c4/0x1d0 [<ffffffff80287a2c>] do_lookup+0xc4/0x1ae [<ffffffff80289551>] __link_path_walk+0x885/0xd2b [<ffffffff80289a4f>] link_path_walk+0x58/0xe0 [<ffffffff80289deb>] do_path_lookup+0x1be/0x1e2 [<ffffffff80288b1e>] getname+0x152/0x196 [<ffffffff8028a626>] __user_walk_fd+0x37/0x53 [<ffffffff80283c85>] vfs_lstat_fd+0x18/0x47 [<ffffffff80283e79>] sys_newlstat+0x19/0x31 [<ffffffff80556a9f>] trace_hardirqs_on_thunk+0x35/0x37 [<ffffffff8034a59d>] _atomic_dec_and_lock+0x39/0x58 [<ffffffff8020945e>] system_call+0x7e/0x83 Code: 0f 0b eb fe 49 8b 86 70 03 00 00 49 ff 86 78 03 00 00 48 ff RIP [<ffffffff8027b89d>] cache_alloc_refill+0xe6/0x22a RSP <ffff810078be7a28> note: find[12205] exited with preempt_count 1 BUG: scheduling while atomic: find/0x10000001/12205 INFO: lockdep is turned off. UG: scheduling while atomic: find/0x10000001/12205 INFO: lockdep is turned off. Call Trace: [<ffffffff80553e61>] __sched_text_start+0x81/0x80b [<ffffffff8039b16c>] vt_console_print+0x21f/0x235 [<ffffffff805574a4>] _spin_unlock_irqrestore+0x49/0x69 [<ffffffff8022bbda>] __cond_resched+0x13/0x32 [<ffffffff80554e85>] cond_resched+0x2e/0x39 [<ffffffff80266b8b>] unmap_vmas+0x5e5/0x778 [<ffffffff8026a6ec>] exit_mmap+0x80/0x117 [<ffffffff8022e91e>] mmput+0x2c/0x9e [<ffffffff80233fb4>] do_exit+0x21a/0x82e [<ffffffff805574a4>] _spin_unlock_irqrestore+0x49/0x69 [<ffffffff8020acab>] kernel_math_error+0x0/0x90 [<ffffffff8020b287>] do_invalid_op+0xb2/0xbc [<ffffffff8027b89d>] cache_alloc_refill+0xe6/0x22a [<ffffffff80556a9f>] trace_hardirqs_on_thunk+0x35/0x37 [<ffffffff80209a00>] restore_args+0x0/0x30 [<ffffffff805579ed>] error_exit+0x0/0x96 [<ffffffff8027b826>] cache_alloc_refill+0x6f/0x22a [<ffffffff8027b89d>] cache_alloc_refill+0xe6/0x22a [<ffffffff8027b884>] cache_alloc_refill+0xcd/0x22a [<ffffffff802ce4cb>] reiserfs_alloc_inode+0x15/0x2a [<ffffffff802c7590>] reiserfs_find_actor+0x0/0x1b [<ffffffff8027bda3>] kmem_cache_alloc+0x8c/0xe2 [<ffffffff802ce4cb>] reiserfs_alloc_inode+0x15/0x2a [<ffffffff802925c9>] alloc_inode+0x12/0x13f [<ffffffff8029289d>] iget5_locked+0x5a/0x18a [<ffffffff802c757e>] reiserfs_init_locked_inode+0x0/0x12 [<ffffffff802c54a0>] reiserfs_iget+0x30/0x92 [<ffffffff802d5079>] pathrelse+0x24/0x3c [<ffffffff802c2a11>] reiserfs_lookup+0xcf/0x138 [<ffffffff80557303>] _read_trylock+0x47/0x6b [<ffffffff80290b6e>] d_alloc+0x1c4/0x1d0 [<ffffffff80287a2c>] do_lookup+0xc4/0x1ae [<ffffffff80289551>] __link_path_walk+0x885/0xd2b [<ffffffff80289a4f>] link_path_walk+0x58/0xe0 [<ffffffff80289deb>] do_path_lookup+0x1be/0x1e2 [<ffffffff80288b1e>] getname+0x152/0x196 [<ffffffff8028a626>] __user_walk_fd+0x37/0x53 [<ffffffff80283c85>] vfs_lstat_fd+0x18/0x47 [<ffffffff80283e79>] sys_newlstat+0x19/0x31 [<ffffffff80556a9f>] trace_hardirqs_on_thunk+0x35/0x37 [<ffffffff8034a59d>] _atomic_dec_and_lock+0x39/0x58 [<ffffffff8020945e>] system_call+0x7e/0x83 BUG: scheduling while atomic: find/0x10000001/12205 INFO: lockdep is turned off. 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