Hi all, While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following spew:
[ 400.588117] BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 [ 400.590137] IP: configfs_lookup (fs/configfs/dir.c:467) [ 400.590137] PGD 1e5d5a067 PUD 1e5d5b067 PMD 0 [ 400.590137] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 400.590137] Dumping ftrace buffer: [ 400.590137] (ftrace buffer empty) [ 400.590137] Modules linked in: [ 400.590137] CPU: 30 PID: 10751 Comm: trinity-c387 Tainted: G W 3.15.0-rc5-next-20140512-sasha-00019-ga20bc00-dirty #456 [ 400.590137] task: ffff8801e5d7b000 ti: ffff8801e5d76000 task.ti: ffff8801e5d76000 [ 400.590137] RIP: configfs_lookup (fs/configfs/dir.c:467) [ 400.590137] RSP: 0018:ffff8801e5d77cb8 EFLAGS: 00010282 [ 400.590137] RAX: 0000000000000000 RBX: fffffffffffffff8 RCX: 0000005d44e90770 [ 400.590137] RDX: 0000000000000001 RSI: ffffffff9c3a51c0 RDI: ffffffff9f58b685 [ 400.590137] RBP: ffff8801e5d77ce8 R08: 000000000000c3e6 R09: 0000000000000000 [ 400.590137] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880000094510 [ 400.590137] R13: ffff8806ca053528 R14: 00000000ffffff9c R15: ffff8801e5d77e70 [ 400.590137] FS: 00007fd417ee9700(0000) GS:ffff8806cae00000(0000) knlGS:0000000000000000 [ 400.590137] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 400.590137] CR2: 0000000000000038 CR3: 00000001e5d59000 CR4: 00000000000006a0 [ 400.614494] DR0: 00000000006df000 DR1: 0000000000000000 DR2: 0000000000000000 [ 400.614494] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000602 [ 400.614494] Stack: [ 400.614494] ffff8800365625f8 ffff8801e5d77e80 ffff8801e5d77d18 ffff8806ca053528 [ 400.614494] ffff8800365625f8 ffff8800365625f8 ffff8801e5d77d18 ffffffff9c31e086 [ 400.614494] ffff8800365625f8 ffff8800365625f8 00000000ffffff9c 0000000000000001 [ 400.614494] Call Trace: [ 400.614494] lookup_real (fs/namei.c:1331) [ 400.614494] __lookup_hash (fs/namei.c:1349) [ 400.614494] lookup_slow (fs/namei.c:1459) [ 400.614494] path_lookupat (fs/namei.c:1539 fs/namei.c:1909 fs/namei.c:1943) [ 400.614494] ? kmem_cache_alloc (include/linux/kmemleak.h:44 mm/slub.c:975 mm/slub.c:2481 mm/slub.c:2489 mm/slub.c:2494) [ 400.614494] ? getname_flags (fs/namei.c:145) [ 400.614494] ? getname_flags (fs/namei.c:145) [ 400.627077] ? vtime_account_user (kernel/sched/cputime.c:687) [ 400.627077] filename_lookup (fs/namei.c:1983) [ 400.627077] user_path_at_empty (fs/namei.c:2134) [ 400.627077] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [ 400.627077] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2557 kernel/locking/lockdep.c:2599) [ 400.627077] ? trace_hardirqs_on (kernel/locking/lockdep.c:2607) [ 400.627077] user_path_at (fs/namei.c:2145) [ 400.627077] SyS_removexattr (fs/xattr.c:651 fs/xattr.c:644) [ 400.627077] ? tracesys (arch/x86/kernel/entry_64.S:735) [ 400.627077] tracesys (arch/x86/kernel/entry_64.S:746) [ 400.627077] Code: fa ff ff 89 c2 48 c7 c0 fe ff ff ff 85 d2 0f 84 57 01 00 00 49 8b 44 24 18 49 83 c4 18 48 8d 58 f8 49 39 c4 0f 84 29 01 00 00 90 <f6> 43 40 04 0f 84 de 00 00 00 48 89 df e8 8e d7 ff ff 49 8b 75 [ 400.627077] RIP configfs_lookup (fs/configfs/dir.c:467) [ 400.627077] RSP <ffff8801e5d77cb8> [ 400.627077] CR2: 0000000000000038 Thanks, Sasha -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
