Date:   Mon, 24 Oct 2022 15:43:21 +0200
From:   Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     regressions@...ts.linux.dev, regressions@...mhuis.info,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: BUG: bisected: thermald regression (MEMLEAK) in commit
 c7ff29763989bd09c433f73fae3c1e1c15d9cda4

Hi all,

[Due to unexplained garbling of the text; will try to submit the bug 
report again.]

There was a bug discovered in 6.0-rc3..rc7 kernels on Sep 27th 2022.

There was a kernel memory leak in thermald, disovered with a mainline 
build with
CONFIG_DEBUG_MEMLEAK=y.

sudo cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff8881095f3ee0 (size 80):
   comm "thermald", pid 837, jiffies 4294896698 (age 9867.428s)
   hex dump (first 32 bytes):
     00 00 00 00 00 00 00 00 0d 01 2d 00 00 00 00 00 ..........-.....
     af 07 01 00 00 c9 ff ff 00 00 00 00 00 00 00 00 ................
   backtrace:
     [<00000000b50b9dd6>] kmem_cache_alloc+0x184/0x380
     [<00000000fa8428c0>] acpi_os_acquire_object+0x2c/0x32
     [<000000002cc0099f>] acpi_ps_alloc_op+0x65/0xe6
     [<00000000335faf1b>] acpi_ps_get_next_arg+0x842/0x9ed
     [<000000007afa2dee>] acpi_ps_parse_loop+0x718/0xee1
     [<0000000010ce490e>] acpi_ps_parse_aml+0x261/0x7b2
     [<00000000278d4c5f>] acpi_ps_execute_method+0x360/0x459
     [<00000000ff7ad4ba>] acpi_ns_evaluate+0x595/0x810
     [<0000000037ce3488>] acpi_evaluate_object+0x28b/0x5b2
     [<000000001a800bbf>] acpi_run_osc+0x209/0x3d0
     [<00000000776fbd43>] int3400_thermal_run_osc+0xed/0x180 
[int3400_thermal]
     [<00000000d6ec2302>] current_uuid_store+0x17c/0x1d0 [int3400_thermal]
     [<00000000486cf3e6>] dev_attr_store+0x3e/0x60
     [<00000000bf193027>] sysfs_kf_write+0x88/0xa0
     [<00000000820b5cce>] kernfs_fop_write_iter+0x1c9/0x270
     [<0000000062f8d35e>] vfs_write+0x5a5/0x750

Mr. Pandruvada request a bisection on the bug, so I eventually made one.

The culprit seems to be the following commit (but I am unable to discern 
the bug):
# first bad commit: [c7ff29763989bd09c433f73fae3c1e1c15d9cda4] thermal: 
int340x: Update OS policy capability handshake

mtodorov@...ac:~/linux/kernel/linux_stable$ git bisect log
git bisect start
# good: [b6abb62daa5511c4a3eaa30cbdb02544d1f10fa2] Linux 5.15.1
git bisect good b6abb62daa5511c4a3eaa30cbdb02544d1f10fa2
# bad: [e6f4ff3f91251f67b130c29f38673eb5702f88b9] Linux 6.0.3
git bisect bad e6f4ff3f91251f67b130c29f38673eb5702f88b9
# good: [8bb7eca972ad531c9b149c0a51ab43a417385813] Linux 5.15
git bisect good 8bb7eca972ad531c9b149c0a51ab43a417385813
# bad: [1464677662943738741500a6f16b85d36bbde2be] Merge tag 
'platform-drivers-x86-v5.18-1' of 
git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86
git bisect bad 1464677662943738741500a6f16b85d36bbde2be
# good: [8efd0d9c316af470377894a6a0f9ff63ce18c177] Merge tag 
'5.17-net-next' of 
git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
git bisect good 8efd0d9c316af470377894a6a0f9ff63ce18c177
# good: [aaa25a2fa7964d94690f6de5edd7164ca7d76555] Merge 
git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
git bisect good aaa25a2fa7964d94690f6de5edd7164ca7d76555
# bad: [b4bc93bd76d4da32600795cd323c971f00a2e788] Merge tag 
'arm-drivers-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect bad b4bc93bd76d4da32600795cd323c971f00a2e788
# bad: [ef510682af3dbe2f9cdae7126a1461c94e010967] Merge tag 
'f2fs-for-5.18' of 
git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
git bisect bad ef510682af3dbe2f9cdae7126a1461c94e010967
# good: [a04b1bf574e1f4875ea91f5c62ca051666443200] Merge tag 
'for-5.18/parisc-1' of 
git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
git bisect good a04b1bf574e1f4875ea91f5c62ca051666443200
# bad: [b080cee72ef355669cbc52ff55dc513d37433600] Merge tag 
'for-5.18/io_uring-statx-2022-03-18' of git://git.kernel.dk/linux-block
git bisect bad b080cee72ef355669cbc52ff55dc513d37433600
# good: [02b82b02c34321dde10d003aafcd831a769b2a8a] Merge tag 
'pm-5.18-rc1' of 
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
git bisect good 02b82b02c34321dde10d003aafcd831a769b2a8a
# good: [0e03b8fd29363f2df44e2a7a176d486de550757a] crypto: xilinx - Turn 
SHA into a tristate and allow COMPILE_TEST
git bisect good 0e03b8fd29363f2df44e2a7a176d486de550757a
# good: [3e504d2026eb6c8762cd6040ae57db166516824a] random: check for 
signal and try earlier when generating entropy
git bisect good 3e504d2026eb6c8762cd6040ae57db166516824a
# good: [5e929367468c8f97cd1ffb0417316cecfebef94b] io_uring: terminate 
manual loop iterator loop correctly for non-vecs
git bisect good 5e929367468c8f97cd1ffb0417316cecfebef94b
# bad: [2d6fc1455f3f383499e013ebc4b19ff49c53c15e] Merge branches 
'thermal-powerclamp', 'thermal-int340x' and 'thermal-docs'
git bisect bad 2d6fc1455f3f383499e013ebc4b19ff49c53c15e
# good: [1d6aab36a26ba44b114d7f8a857c430c9e0c32c9] 
thermal/drivers/ti-soc-thermal: Remove unused function ti_thermal_get_temp()
git bisect good 1d6aab36a26ba44b114d7f8a857c430c9e0c32c9
# bad: [c7ff29763989bd09c433f73fae3c1e1c15d9cda4] thermal: int340x: 
Update OS policy capability handshake
git bisect bad c7ff29763989bd09c433f73fae3c1e1c15d9cda4
# good: [098c874e20be2a4cee3021aa9b3485ed5e1f4d5b] thermal: Replace 
acpi_bus_get_device()
git bisect good 098c874e20be2a4cee3021aa9b3485ed5e1f4d5b
# good: [668f69a5f863b877bc3ae129efe9a80b6f055141] thermal: int340x: 
Increase bitmap size
git bisect good 668f69a5f863b877bc3ae129efe9a80b6f055141
# first bad commit: [c7ff29763989bd09c433f73fae3c1e1c15d9cda4] thermal: 
int340x: Update OS policy capability handshake
You have new mail in /var/mail/mtodorov
mtodorov@...ac:~/linux/kernel/linux_stable$

I am available for any further questions or issues on the bug.

Have a nice day :)

Regards,
Mirsad

On 10/24/2022 3:13 PM, Mirsad Goran Todorovac wrote:
> ...
>
-- 
Mirsad Goran Todorovac
Sistem inženjer
Grafički fakultet | Akademija likovnih umjetnosti
Sveučilište u Zagrebu
--
System engineer
Faculty of Graphic Arts | Academy of Fine Arts
University of Zagreb, Republic of Croatia
tel. +385 (0)1 3711 451
mob. +385 91 57 88 355

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