BUG: bisected: thermald regression (MEMLEAK) in commit c7ff29763989bd09c433f73fae3c1e1c15d9cda4

[Mirsad Goran Todorovac]

Dear all,

Around Sep 27th 2022 I've noticed in a mainline kernel built with 
CONFIG_DEBUG_KMEMLEAK=y
that there actually is a leak:

|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 required a bug bisect from me, so I 
have eventually made one. # first bad commit: 
[c7ff29763989bd09c433f73fae3c1e1c15d9cda4] thermal: int340x: Update OS 
policy capability handshake Here is the git bisect log: 
mtodorov@domac:~/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@domac:~/linux/kernel/linux_stable$ I was 
unable to locate the culprit in the patch myself. Thank you very much 
for your attention. I am available for all further questions. Have a 
nice day :) Regards, |

--
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