linux-kernel - WARNING: CPU: 0 PID: 913 at fs/inode.c:275 drop

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Date:	Mon, 23 Nov 2015 08:55:34 +0100
From:	Vegard Nossum <vegard.nossum@...cle.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: WARNING: CPU: 0 PID: 913 at fs/inode.c:275 drop_nlink+0x4b/0x50()

Hi,

With the attached vfat disk image (fuzzed), I get the following WARNING:

WARNING: CPU: 0 PID: 913 at fs/inode.c:275 drop_nlink+0x4b/0x50()
CPU: 0 PID: 913 Comm: a.out Not tainted 4.2.5+ #39
Stack:
  e0931b50 60075412 e13981e8 00000009
  00000000 605cc684 e0931b60 605cf637
  e0931bc0 60040f6d e0931ba0 6011e12b
Call Trace:
  [<60029f3b>] show_stack+0xdb/0x1a0
  [<605cf637>] dump_stack+0x2a/0x2c
  [<60040f6d>] warn_slowpath_common+0x9d/0xf0
  [<6004114c>] warn_slowpath_null+0x1c/0x20
  [<6011e12b>] drop_nlink+0x4b/0x50
  [<601e9e2f>] vfat_rename+0x56f/0x800
  [<60113dd2>] vfs_rename+0x9a2/0x9d0
  [<60114439>] SyS_renameat2+0x639/0x690
  [<601144d0>] SyS_rename+0x20/0x30
  [<6002c5ce>] handle_syscall+0x6e/0xa0
  [<6003a911>] userspace+0x4f1/0x5e0

To trigger it, you have to do a rename("/mnt/a/b/1", "/mnt/1"), where
/mnt is your mountpoint.

Also happens on 3.13.0 Ubuntu trusty kernel.


Vegard

Download attachment "vfat2.img.bz2" of type "application/x-bzip" (615 bytes)