proc: print more information when removing non-empty directories
Alexey Dobriyan [Tue, 29 Apr 2008 08:01:35 +0000 (01:01 -0700)]
This usually saves one recompile to insert similar printk like below. :)

Sample nastygram:

remove_proc_entry: removing non-empty directory '/proc/foo', leaking at least 'bar'
------------[ cut here ]------------
WARNING: at fs/proc/generic.c:776 remove_proc_entry+0x18a/0x200()
Modules linked in: foo(-) container fan battery dock sbs ac sbshc backlight ipv6 loop af_packet amd_rng sr_mod i2c_amd8111 i2c_amd756 cdrom i2c_core button thermal processor
Pid: 3034, comm: rmmod Tainted: G   M     2.6.25-rc1 #5

Call Trace:
 [<ffffffff80231974>] warn_on_slowpath+0x64/0x90
 [<ffffffff80232a6e>] printk+0x4e/0x60
 [<ffffffff802d6c8a>] remove_proc_entry+0x18a/0x200
 [<ffffffff8045cd88>] mutex_lock_nested+0x1c8/0x2d0
 [<ffffffff8025f0f0>] __try_stop_module+0x0/0x40
 [<ffffffff8025effd>] sys_delete_module+0x14d/0x200
 [<ffffffff8045df3d>] lockdep_sys_exit_thunk+0x35/0x67
 [<ffffffff8031c307>] __up_read+0x27/0xa0
 [<ffffffff8045decc>] trace_hardirqs_on_thunk+0x35/0x3a
 [<ffffffff8020b6ab>] system_call_after_swapgs+0x7b/0x80

---[ end trace 10ef850597e89c54 ]---

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/proc/generic.c

index a36ad3c..f501f32 100644 (file)
@@ -777,7 +777,12 @@ continue_removing:
                if (S_ISDIR(de->mode))
                        parent->nlink--;
                de->nlink = 0;
-               WARN_ON(de->subdir);
+               if (de->subdir) {
+                       printk(KERN_WARNING "%s: removing non-empty directory "
+                              "'%s/%s', leaking at least '%s'\n", __func__,
+                              de->parent->name, de->name, de->subdir->name);
+                       WARN_ON(1);
+               }
                if (atomic_dec_and_test(&de->count))
                        free_proc_entry(de);
                break;