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From: Jens Axboe <axboe@kernel.dk>
To: Guoqing Jiang <guoqing.jiang@linux.dev>, paolo.valente@linaro.org
Cc: linux-block@vger.kernel.org
Subject: Re: bfq - suspected memory leaks
Date: Wed, 15 Sep 2021 06:56:14 -0600	[thread overview]
Message-ID: <38fc74a9-f748-54b9-d072-d3fa88a3d7d8@kernel.dk> (raw)
In-Reply-To: <72691728-304b-a80b-5850-92879fffc61a@linux.dev>

On 9/8/21 10:07 PM, Guoqing Jiang wrote:
> Hi,
> 
> With latest kernel (commit 4ac6d90867a4 "Merge tag 'docs-5.15' of 
> git://git.lwn.net/linux"),
> I got lots of kmemleak reports during compile kernel source code.
> 
> # dmesg |grep kmemleak
> [18234.655491] kmemleak: 1 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> [18890.247552] kmemleak: 2 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> [19745.602271] kmemleak: 2 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> [20390.965851] kmemleak: 4 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> [21150.173950] kmemleak: 4 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> [21929.951448] kmemleak: 15 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> [23589.726859] kmemleak: 2 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> [24416.441263] kmemleak: 1 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> [30400.835853] kmemleak: 10 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> [68673.737862] kmemleak: 2 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> [72770.498898] kmemleak: 1 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> [77046.434369] kmemleak: 7 new suspected memory leaks (see 
> /sys/kernel/debug/kmemleak)
> 
> All of them  have similar trace as follows.
> 
>    comm "sh", pid 27054, jiffies 4302241171 (age 47562.964s)
>    hex dump (first 32 bytes):
>      01 00 00 00 00 00 00 00 00 b0 20 02 80 88 ff ff  .......... .....
>      04 00 02 00 04 00 02 00 00 00 00 00 00 00 00 00 ................
>    backtrace:
>      [<000000004fa2550b>] bfq_get_queue+0x2a8/0xfd0
>      [<00000000b1757a70>] bfq_get_bfqq_handle_split+0xa4/0x240
>      [<00000000ac263274>] bfq_init_rq+0x1f7/0x1d10
>      [<00000000110283e1>] bfq_insert_requests+0xf7/0x5f0
>      [<000000002ed06e79>] blk_mq_sched_insert_requests+0xfe/0x350
>      [<000000000ebf38ac>] blk_mq_flush_plug_list+0x256/0x3e0
>      [<00000000bc647b2b>] blk_flush_plug_list+0x1ff/0x240
>      [<000000004e7e49f8>] blk_finish_plug+0x3c/0x60
>      [<000000008802f1e4>] read_pages+0x28f/0x580
>      [<000000009986d1f4>] page_cache_ra_unbounded+0x266/0x3a0
>      [<00000000492c494f>] filemap_fault+0x8a8/0xfe0
>      [<000000009cbd8d38>] __do_fault+0x70/0x150
>      [<000000002740a35f>] do_fault+0x112/0x670
>      [<00000000a74facab>] __handle_mm_fault+0x57e/0xcc0
>      [<0000000024009667>] handle_mm_fault+0xd6/0x330
>      [<00000000fb1e0780>] do_user_addr_fault+0x2a9/0x8b0
> unreferenced object 0xffff888021e5dd90 (size 560):

Paolo, are you on top of this one?

-- 
Jens Axboe


  reply	other threads:[~2021-09-15 12:56 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-09  4:07 bfq - suspected memory leaks Guoqing Jiang
2021-09-15 12:56 ` Jens Axboe [this message]
2021-09-18 11:01   ` Paolo Valente

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