On 12/20/2013 06:40 PM, Sasha Levin wrote:
Hi all, While fuzzing with trinity inside a KVM tools guest running latest -next kernel, I've stumbled on the following spew. This reproduced twice with the same call trace, so I suspect it's something specific with the way the module subsystem calls vfs_getattr rather than something odd in vfs.
Sorry, forget that. Just got one that has nothing to do with modules: BUG: unable to handle kernel paging request at ffff880429d40010 [ 2935.385056] IP: [<ffffffff812d792d>] generic_fillattr+0xd/0xa0 [ 2935.386268] PGD 857a067 PUD 857d067 PMD 42fe93067 PTE 8000000429d40060 [ 2935.387998] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 2935.389936] Dumping ftrace buffer: [ 2935.390321] (ftrace buffer empty) [ 2935.390321] Modules linked in: [ 2935.390321] CPU: 22 PID: 57475 Comm: trinity-c598 Tainted: G W 3.13.0-rc4- next-20131220-sasha-00014-gd62f590-dirty #2 [ 2935.390321] task: ffff88005d880000 ti: ffff88004e3be000 task.ti: ffff88004e3be000 [ 2935.390321] RIP: 0010:[<ffffffff812d792d>] [<ffffffff812d792d>] generic_fillattr+0x d/0xa0 [ 2935.390321] RSP: 0018:ffff88004e3bfe58 EFLAGS: 00010246 [ 2935.390321] RAX: ffff880429d40000 RBX: ffff88015bf9e5d0 RCX: ffff88015b700a20 [ 2935.390321] RDX: 0000000000000000 RSI: ffff88004e3bfee8 RDI: ffff88042a078550 [ 2935.390321] RBP: ffff88004e3bfe58 R08: ffff88042a078550 R09: 0000000000000000 [ 2935.390321] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88004e3bfee8 [ 2935.390321] R13: ffff88004e3bfee8 R14: 0000000000000000 R15: 0000000000000010 [ 2935.390321] FS: 00007ff7f4855700(0000) GS:ffff880161a00000(0000) knlGS:000000000000 0000 [ 2935.390321] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 2935.390321] CR2: ffff880429d40010 CR3: 0000000035487000 CR4: 00000000000006e0 [ 2935.390321] Stack: [ 2935.390321] ffff88004e3bfe68 ffffffff812d79f8 ffff88004e3bfe88 ffffffff812d7fe7 [ 2935.390321] ffff88015bf9e5c0 0000000000000000 ffff88004e3bfed8 ffffffff812d81f2 [ 2935.390321] ffff88004e3bfeb8 ffff88005d880000 ffffffff81249435 0000000000000256 [ 2935.390321] Call Trace: [ 2935.390321] [<ffffffff812d79f8>] vfs_getattr_nosec+0x38/0x40 [ 2935.390321] [<ffffffff812d7fe7>] vfs_getattr+0x37/0x50 [ 2935.390321] [<ffffffff812d81f2>] vfs_fstat+0x42/0x70 [ 2935.390321] [<ffffffff81249435>] ? context_tracking_user_exit+0x195/0x1d0 [ 2935.390321] [<ffffffff812d852f>] SYSC_newfstat+0x1f/0x40 [ 2935.390321] [<ffffffff8119302d>] ? trace_hardirqs_on+0xd/0x10 [ 2935.390321] [<ffffffff8107a852>] ? syscall_trace_enter+0x32/0x290 [ 2935.390321] [<ffffffff843b5ef1>] ? tracesys+0x7e/0xe2 [ 2935.390321] [<ffffffff812d855e>] SyS_newfstat+0xe/0x10 [ 2935.390321] [<ffffffff843b5f50>] tracesys+0xdd/0xe2 Thanks, Sasha -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
