linux-kernel - Re: BTRFS: Kmemleak errrors with do_sys

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Message-ID: <c02fc5c2-2c1d-48c1-5e16-522a1756daed@suse.com>
Date:   Fri, 26 Jul 2019 16:25:42 +0300
From:   Nikolay Borisov <nborisov@...e.com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>, Chris Mason <clm@...com>,
        David Sterba <dsterba@...e.com>,
        Josef Bacik <josef@...icpanda.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        linux-btrfs@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: BTRFS: Kmemleak errrors with do_sys_ftruncate



On 26.07.19 г. 16:16 ч., Paul Menzel wrote:
> Dear Linux folks,
> 
> 
> On a Power 8 server
> 
>     Linux power 5.3.0-rc1+ #1 SMP Fri Jul 26 11:34:28 CEST 2019 ppc64le ppc64le ppc64le GNU/Linux
> 
> Kmemleak reports the warnings below.
> 
> ```
> $ sudo more /sys/kernel/debug/kmemleak
> unreferenced object 0xc00000f290866130 (size 80):
>   comm "networkd-dispat", pid 7630, jiffies 4294903138 (age 6540.748s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 ff ff 00 00 00 00 00 00  ................
>     40 61 86 90 f2 00 00 c0 00 00 00 00 00 00 00 00  @a..............
>   backtrace:
>     [<00000000ecec0137>] alloc_extent_state+0x4c/0x1b0 [btrfs]
>     [<000000003f22a890>] __set_extent_bit+0x330/0x790 [btrfs]
>     [<0000000020fcf70f>] lock_extent_bits+0x98/0x320 [btrfs]
>     [<000000001d1d0f77>] btrfs_lock_and_flush_ordered_range+0xf0/0x1b0 [btrfs]
>     [<00000000195c001c>] btrfs_cont_expand+0x14c/0x600 [btrfs]
>     [<00000000f280c100>] btrfs_setattr+0x130/0x770 [btrfs]
>     [<000000008f89382e>] notify_change+0x218/0x5b0
>     [<00000000fc1ffb03>] do_truncate+0x9c/0x140
>     [<000000008b736052>] do_sys_ftruncate+0x1e4/0x210
>     [<00000000f67bba86>] system_call+0x5c/0x70
> unreferenced object 0xc000007f9cc555f0 (size 80):
>   comm "unattended-upgr", pid 8069, jiffies 4294903488 (age 6539.396s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 ff ff 00 00 00 00 00 00  ................
>     00 56 c5 9c 7f 00 00 c0 00 00 00 00 00 00 00 00  .V..............
>   backtrace:
>     [<00000000ecec0137>] alloc_extent_state+0x4c/0x1b0 [btrfs]
>     [<000000003f22a890>] __set_extent_bit+0x330/0x790 [btrfs]
>     [<0000000020fcf70f>] lock_extent_bits+0x98/0x320 [btrfs]
>     [<000000001d1d0f77>] btrfs_lock_and_flush_ordered_range+0xf0/0x1b0 [btrfs]
>     [<00000000195c001c>] btrfs_cont_expand+0x14c/0x600 [btrfs]
>     [<00000000f280c100>] btrfs_setattr+0x130/0x770 [btrfs]
>     [<000000008f89382e>] notify_change+0x218/0x5b0
>     [<00000000fc1ffb03>] do_truncate+0x9c/0x140
>     [<000000008b736052>] do_sys_ftruncate+0x1e4/0x210
>     [<00000000f67bba86>] system_call+0x5c/0x70
> unreferenced object 0xc000007fa1431fe0 (size 80):
>   comm "lxd", pid 8347, jiffies 4294904066 (age 6537.104s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 ff ff 00 00 00 00 00 00  ................
>     f0 1f 43 a1 7f 00 00 c0 00 00 00 00 00 00 00 00  ..C.............
>   backtrace:
>     [<00000000ecec0137>] alloc_extent_state+0x4c/0x1b0 [btrfs]
>     [<000000003f22a890>] __set_extent_bit+0x330/0x790 [btrfs]
>     [<0000000020fcf70f>] lock_extent_bits+0x98/0x320 [btrfs]
>     [<000000001d1d0f77>] btrfs_lock_and_flush_ordered_range+0xf0/0x1b0 [btrfs]
>     [<00000000195c001c>] btrfs_cont_expand+0x14c/0x600 [btrfs]
>     [<00000000f280c100>] btrfs_setattr+0x130/0x770 [btrfs]
>     [<000000008f89382e>] notify_change+0x218/0x5b0
>     [<00000000fc1ffb03>] do_truncate+0x9c/0x140
>     [<000000008b736052>] do_sys_ftruncate+0x1e4/0x210
>     [<00000000f67bba86>] system_call+0x5c/0x70
> unreferenced object 0xc000007f98359470 (size 80):
>   comm "lxd", pid 8347, jiffies 4294904738 (age 6534.416s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 ff ff 00 00 00 00 00 00  ................
>     80 94 35 98 7f 00 00 c0 00 00 00 00 00 00 00 00  ..5.............
>   backtrace:
>     [<00000000ecec0137>] alloc_extent_state+0x4c/0x1b0 [btrfs]
>     [<000000003f22a890>] __set_extent_bit+0x330/0x790 [btrfs]
>     [<0000000020fcf70f>] lock_extent_bits+0x98/0x320 [btrfs]
>     [<000000001d1d0f77>] btrfs_lock_and_flush_ordered_range+0xf0/0x1b0 [btrfs]
>     [<00000000195c001c>] btrfs_cont_expand+0x14c/0x600 [btrfs]
>     [<00000000f280c100>] btrfs_setattr+0x130/0x770 [btrfs]
>     [<000000008f89382e>] notify_change+0x218/0x5b0
>     [<00000000fc1ffb03>] do_truncate+0x9c/0x140
>     [<000000008b736052>] do_sys_ftruncate+0x1e4/0x210
>     [<00000000f67bba86>] system_call+0x5c/0x70
> unreferenced object 0xc000007f9e7078f0 (size 80):
>   comm "landscape-sysin", pid 10187, jiffies 4295061226 (age 5908.520s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 ff ff 00 00 00 00 00 00  ................
>     00 79 70 9e 7f 00 00 c0 00 00 00 00 00 00 00 00  .yp.............
>   backtrace:
>     [<00000000ecec0137>] alloc_extent_state+0x4c/0x1b0 [btrfs]
>     [<000000003f22a890>] __set_extent_bit+0x330/0x790 [btrfs]
>     [<0000000020fcf70f>] lock_extent_bits+0x98/0x320 [btrfs]
>     [<000000001d1d0f77>] btrfs_lock_and_flush_ordered_range+0xf0/0x1b0 [btrfs]
>     [<00000000195c001c>] btrfs_cont_expand+0x14c/0x600 [btrfs]
>     [<00000000f280c100>] btrfs_setattr+0x130/0x770 [btrfs]
>     [<000000008f89382e>] notify_change+0x218/0x5b0
>     [<00000000fc1ffb03>] do_truncate+0x9c/0x140
>     [<000000008b736052>] do_sys_ftruncate+0x1e4/0x210
>     [<00000000f67bba86>] system_call+0x5c/0x70
> unreferenced object 0xc00000f29b4f48d0 (size 80):
>   comm "landscape-sysin", pid 14433, jiffies 4295569439 (age 3876.396s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 ff ff 00 00 00 00 00 00  ................
>     e0 48 4f 9b f2 00 00 c0 00 00 00 00 00 00 00 00  .HO.............
>   backtrace:
>     [<00000000ecec0137>] alloc_extent_state+0x4c/0x1b0 [btrfs]
>     [<000000003f22a890>] __set_extent_bit+0x330/0x790 [btrfs]
>     [<0000000020fcf70f>] lock_extent_bits+0x98/0x320 [btrfs]
>     [<000000001d1d0f77>] btrfs_lock_and_flush_ordered_range+0xf0/0x1b0 [btrfs]
>     [<00000000195c001c>] btrfs_cont_expand+0x14c/0x600 [btrfs]
>     [<00000000f280c100>] btrfs_setattr+0x130/0x770 [btrfs]
>     [<000000008f89382e>] notify_change+0x218/0x5b0
>     [<00000000fc1ffb03>] do_truncate+0x9c/0x140
>     [<000000008b736052>] do_sys_ftruncate+0x1e4/0x210
>     [<00000000f67bba86>] system_call+0x5c/0x70
> ```
> 
> I believe these have been present for some releases already, but Kmemleak
> was broken until now on that system, so that I could only report them now.

the lock and flush ordered range  leaks were fixed just today  by patch :

 btrfs: fix extent_state leak in btrfs_lock_and_flush_ordered_range

So either get it and retest or wait until the RC2 pull req gets merged.


> 
> 
> Kind regards,
> 
> Paul
>