From: Greg KH <gregkh@linuxfoundation.org>
To: Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>
Cc: linux-kernel@vger.kernel.org,
"regressions@lists.linux.dev" <regressions@lists.linux.dev>,
Tejun Heo <tj@kernel.org>, Florian Mickler <florian@mickler.org>,
Thorsten Leemhuis <regressions@leemhuis.info>,
systemd-devel@lists.freedesktop.org
Subject: Re: BUG: kworker + systemd-udevd memory leaks found in 6.1.0-rc4
Date: Thu, 10 Nov 2022 10:20:35 +0100 [thread overview]
Message-ID: <Y2zCYwNNvQWppLWZ@kroah.com> (raw)
In-Reply-To: <a6b76ce0-0fb3-4434-cc3e-ab6f39fb1cf9@alu.unizg.hr>
On Thu, Nov 10, 2022 at 05:57:57AM +0100, Mirsad Goran Todorovac wrote:
> On 04. 11. 2022. 11:40, Mirsad Goran Todorovac wrote:
>
> > Dear Sirs,
> >
> > When building a RPM 6.1.0-rc3 for AlmaLinux 8.6, I have enabled
> > CONFIG_DEBUG_KMEMLEAK=y
> > and the result showed an unreferenced object in kworker process:
> >
> > # cat /sys/kernel/debug/kmemleak
> > unreferenced object 0xffffa01dabff6100 (size 16):
> > comm "kworker/u12:4", pid 400, jiffies 4294894771 (age 5284.956s)
> > hex dump (first 16 bytes):
> > 6d 65 6d 73 74 69 63 6b 30 00 00 00 00 00 00 00 memstick0.......
> > backtrace:
> > [<000000009ff951f6>] __kmem_cache_alloc_node+0x380/0x4e0
> > [<00000000451f4268>] __kmalloc_node_track_caller+0x55/0x150
> > [<0000000005472512>] kstrdup+0x36/0x70
> > [<000000002f797ac4>] kstrdup_const+0x28/0x30
> > [<00000000e3f86581>] kvasprintf_const+0x78/0xa0
> > [<00000000e15920f7>] kobject_set_name_vargs+0x23/0xa0
> > [<000000004158a6c0>] dev_set_name+0x53/0x70
> > [<000000001a120541>] memstick_check+0xff/0x384 [memstick]
> > [<00000000122bb894>] process_one_work+0x214/0x3f0
> > [<00000000fcf282cc>] worker_thread+0x34/0x3d0
> > [<0000000002409855>] kthread+0xed/0x120
> > [<000000007b02b4a3>] ret_from_fork+0x1f/0x30
> > unreferenced object 0xffffa01dabff6ec0 (size 16):
> > comm "kworker/u12:4", pid 400, jiffies 4294894774 (age 5284.944s)
> > hex dump (first 16 bytes):
> > 6d 65 6d 73 74 69 63 6b 30 00 00 00 00 00 00 00 memstick0.......
> > backtrace:
> > [<000000009ff951f6>] __kmem_cache_alloc_node+0x380/0x4e0
> > [<00000000451f4268>] __kmalloc_node_track_caller+0x55/0x150
> > [<0000000005472512>] kstrdup+0x36/0x70
> > [<000000002f797ac4>] kstrdup_const+0x28/0x30
> > [<00000000e3f86581>] kvasprintf_const+0x78/0xa0
> > [<00000000e15920f7>] kobject_set_name_vargs+0x23/0xa0
> > [<000000004158a6c0>] dev_set_name+0x53/0x70
> > [<000000001a120541>] memstick_check+0xff/0x384 [memstick]
> > [<00000000122bb894>] process_one_work+0x214/0x3f0
> > [<00000000fcf282cc>] worker_thread+0x34/0x3d0
> > [<0000000002409855>] kthread+0xed/0x120
> > [<000000007b02b4a3>] ret_from_fork+0x1f/0x30
> > #
> >
> > Please fing the build config and lshw output attached.
> >
> > dmesg is useless, as it is filled with events like:
> >
> > [ 6068.996120] evbug: Event. Dev: input4, Type: 1, Code: 31, Value: 0
> > [ 6068.996121] evbug: Event. Dev: input4, Type: 0, Code: 0, Value: 0
> > [ 6069.124145] evbug: Event. Dev: input4, Type: 4, Code: 4, Value: 458762
> > [ 6069.124149] evbug: Event. Dev: input4, Type: 1, Code: 34, Value: 1
> > [ 6069.124150] evbug: Event. Dev: input4, Type: 0, Code: 0, Value: 0
> > [ 6069.196003] evbug: Event. Dev: input4, Type: 4, Code: 4, Value: 458762
> > [ 6069.196007] evbug: Event. Dev: input4, Type: 1, Code: 34, Value: 0
> > [ 6069.196009] evbug: Event. Dev: input4, Type: 0, Code: 0, Value: 0
> > [ 6069.788129] evbug: Event. Dev: input4, Type: 4, Code: 4, Value: 458792
> > [ 6069.788133] evbug: Event. Dev: input4, Type: 1, Code: 28, Value: 1
> > [ 6069.788135] evbug: Event. Dev: input4, Type: 0, Code: 0, Value: 0
>
> This bug is confirmed in 6.1-rc4, among the "thermald" and "systemd-dev"
> kernel memory leaks, potentially exposing race conditions or other more
> serious bug.
How is a memory leak a race condition?
> The bug is now also confirmed and now manifested also in the Ubuntu 22.04
> LTS jammy 6.1-rc4 build.
>
> Here is the kmemleak output:
>
> unreferenced object 0xffff9242b13b3980 (size 64):
> comm "kworker/5:3", pid 43106, jiffies 4305052439 (age 71828.792s)
> hex dump (first 32 bytes):
> 80 8b a0 f0 42 92 ff ff 00 00 00 00 00 00 00 00 ....B...........
> 20 86 a0 f0 42 92 ff ff 00 00 00 00 00 00 00 00 ...B...........
> backtrace:
> [<00000000c5dea4db>] __kmem_cache_alloc_node+0x380/0x4e0
> [<000000002b17af47>] kmalloc_node_trace+0x27/0xa0
> [<000000004c09eee5>] xhci_alloc_command+0x6e/0x180
This is a totally different backtrace from above, how are they related?
This looks like a potential xhci issue. Can you use 'git bisect' to
track down the offending change that caused this?
thanks,
greg k-h
next prev parent reply other threads:[~2022-11-10 9:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-04 10:40 BUG: kworker memory leak found in 6.1.0-rc3 Mirsad Goran Todorovac
2022-11-10 4:57 ` BUG: kworker + systemd-udevd memory leaks found in 6.1.0-rc4 Mirsad Goran Todorovac
2022-11-10 8:28 ` Thorsten Leemhuis
2022-11-11 8:44 ` Mirsad Goran Todorovac
2022-11-11 10:09 ` Mirsad Goran Todorovac
2022-11-10 9:20 ` Greg KH [this message]
2022-11-17 15:34 ` Mirsad Goran Todorovac
2022-11-29 3:35 ` Mirsad Goran Todorovac
2022-11-29 8:36 ` Greg KH
2022-11-29 9:59 ` Mirsad Goran Todorovac
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