Messages in this thread Patch in this message | | | Date | Mon, 11 Feb 2008 14:30:37 +0300 | From | Alexey Dobriyan <> | Subject | [PATCH] proc: print more information when removing non-empty directories |
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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> ---
fs/proc/generic.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- a/fs/proc/generic.c +++ b/fs/proc/generic.c @@ -769,7 +769,12 @@ 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;
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