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Message-ID: <oho6bypbvr7rhveiqmosp3wmb7ptygcuuuq6v2jrsqugfuyfas@5czwntre4pc5>
Date: Tue, 28 Nov 2023 15:42:08 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Richard Fitzgerald <rf@...nsource.cirrus.com>
Cc: Greg KH <gregkh@...uxfoundation.org>,
Marco Pagani <marpagan@...hat.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
linux-kernel@...r.kernel.org, - <patches@...nsource.cirrus.com>
Subject: Re: platform-device-test on 6.6 causes "(null)' : is not
initialized, yet kobject_get() is being called"
Hi,
On Wed, Nov 15, 2023 at 01:28:13PM +0000, Richard Fitzgerald wrote:
> Target platform: Aaeon Whiskeylake UpXtreme (Celeron CPU)
> Target OS: Debian 11 (non-graphical install)
>
> Kernel: v6.6.1 from
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
> branch: linux-6.6.y
> at commit 8afabe2118a9 ("Linux 6.6.1")
>
> defconfig attached.
>
> CONFIG_DM_KUNIT_TEST=m
>
> gcc (Debian 10.2.1-6) 10.2.1 20210110
>
> loading the module to run the test causes kobject_get() to WARN:
>
> sudo modprobe platform-device-test
>
> [ 82.595238] KTAP version 1
> [ 82.595252] 1..1
> [ 82.595487] KTAP version 1
> [ 82.595489] # Subtest: platform-device-devm
> [ 82.595490] # module: platform_device_test
> [ 82.595493] 1..4
> [ 82.596130] ok 1 platform_device_devm_register_unregister_test
> [ 82.596314] ok 2
> platform_device_devm_register_get_unregister_with_devm_test
> [ 82.596387] ------------[ cut here ]------------
> [ 82.596395] kobject: '(null)' (0000000067030afc): is not initialized, yet
> kobject_get() is being called.
> [ 82.596410] WARNING: CPU: 1 PID: 654 at lib/kobject.c:637
> kobject_get+0x4c/0x70
> [ 82.596415] Modules linked in: platform_device_test(E+)
> x86_pkg_temp_thermal(E) intel_powerclamp(E) coretemp(E) crc32_pclmul(E)
> ghash_clmulni_intel(E) sha512_ssse3(E) sha512_generic(E) nls_ascii(E)
> nls_cp437(E) vfat(E) fat(E) aesni_intel(E) libaes(E) crypto_simd(E)
> cryptd(E) mei_wdt(E) mei_hdcp(E) snd_hda_codec_hdmi(E) watchdog(E) rapl(E)
> intel_rapl_msr(E) snd_hda_codec_cs8409(E) snd_hda_codec_generic(E)
> intel_cstate(E) ledtrig_audio(E) snd_hda_intel(E) snd_intel_dspcfg(E)
> intel_uncore(E) snd_hda_codec(E) processor_thermal_device_pci_legacy(E)
> processor_thermal_device(E) snd_hda_core(E) processor_thermal_rfim(E)
> efi_pstore(E) pcspkr(E) mei_me(E) wmi_bmof(E) snd_pcm(E)
> processor_thermal_mbox(E) processor_thermal_rapl(E) snd_timer(E)
> intel_rapl_common(E) int340x_thermal_zone(E) snd(E) intel_soc_dts_iosf(E)
> mei(E) intel_pch_thermal(E) soundcore(E) tpm_crb(E) evdev(E) tpm_tis(E)
> tpm_tis_core(E) tpm(E) intel_pmc_core(E) acpi_pad(E) rng_core(E) acpi_tad(E)
> button(E) msr(E) fuse(E) configfs(E) efivarfs(E) ip_tables(E)
> [ 82.596473] x_tables(E) autofs4(E) ext4(E) crc32c_generic(E) crc16(E)
> mbcache(E) jbd2(E) spi_pxa2xx_platform(E) dw_dmac(E) dw_dmac_core(E)
> mmc_block(E) i915(E) drm_buddy(E) ttm(E) intel_gtt(E) drm_display_helper(E)
> drm_kms_helper(E) sdhci_pci(E) xhci_pci(E) drm(E) crct10dif_pclmul(E)
> cqhci(E) crct10dif_common(E) intel_lpss_pci(E) crc32c_intel(E) sdhci(E)
> intel_lpss(E) xhci_hcd(E) i2c_i801(E) cec(E) i2c_smbus(E) idma64(E)
> mmc_core(E) usbcore(E) usb_common(E) fan(E) video(E) wmi(E)
> [ 82.596508] CPU: 1 PID: 654 Comm: kunit_try_catch Tainted: G E N
> 6.6.1-test #1
> [ 82.596510] Hardware name: AAEON UP-WHL01/UP-WHL01, BIOS UPW1AM19
> 11/10/2020
> [ 82.596512] RIP: 0010:kobject_get+0x4c/0x70
> [ 82.596515] Code: 44 24 38 85 c0 74 3b 78 25 83 c0 01 78 20 4c 89 e0 41
> 5c c3 cc cc cc cc 48 8b 37 48 89 fa 48 c7 c7 80 a6 a1 92 e8 64 2a 68 ff <0f>
> 0b eb c4 be 01 00 00 00 e8 26 08 af ff 4c 89 e0 41 5c c3 cc cc
> [ 82.596517] RSP: 0018:ffffa2cf814e7d40 EFLAGS: 00010286
> [ 82.596519] RAX: 0000000000000000 RBX: ffffffffc111c510 RCX:
> ffff8e28e3c9c888
> [ 82.596521] RDX: 00000000ffffffd8 RSI: 0000000000000027 RDI:
> ffff8e28e3c9c880
> [ 82.596522] RBP: ffff8e27843e48c0 R08: 0000000000000000 R09:
> 00000000ffffefff
> [ 82.596524] R10: ffffa2cf814e7be0 R11: ffffffff92cd2788 R12:
> ffffffffc111c510
> [ 82.596525] R13: 0000000000000000 R14: 0000000000000000 R15:
> ffff8e2784968da0
> [ 82.596526] FS: 0000000000000000(0000) GS:ffff8e28e3c80000(0000)
> knlGS:0000000000000000
> [ 82.596528] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 82.596530] CR2: 0000558fd9288c70 CR3: 000000002b020003 CR4:
> 00000000003706e0
> [ 82.596531] Call Trace:
> [ 82.596532] <TASK>
> [ 82.596534] ? __warn+0x84/0x170
> [ 82.596538] ? kobject_get+0x4c/0x70
> [ 82.596541] ? report_bug+0x198/0x1b0
> [ 82.596545] ? handle_bug+0x3c/0x70
> [ 82.596547] ? exc_invalid_op+0x18/0x70
> [ 82.596549] ? asm_exc_invalid_op+0x1a/0x20
> [ 82.596554] ? kobject_get+0x4c/0x70
> [ 82.596557] kobject_add_internal+0x30/0x2b0
> [ 82.596560] kobject_add+0x7e/0xf0
> [ 82.596565] kobject_create_and_add+0x51/0x90
> [ 82.596567] module_add_driver+0xfe/0x110
> [ 82.596571] bus_add_driver+0x130/0x220
> [ 82.596575] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
> [ 82.596578] driver_register+0x60/0x120
> [ 82.596581]
> probed_platform_device_devm_register_unregister_test+0x40/0x3e0
> [platform_device_test]
> [ 82.596587] ? platform_device_devm_init+0x74/0xd0 [platform_device_test]
> [ 82.596593] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
> [ 82.596595] kunit_generic_run_threadfn_adapter+0x17/0x30
> [ 82.596597] kthread+0xf4/0x130
> [ 82.596600] ? __pfx_kthread+0x10/0x10
> [ 82.596604] ret_from_fork+0x31/0x50
> [ 82.596606] ? __pfx_kthread+0x10/0x10
> [ 82.596609] ret_from_fork_asm+0x1b/0x30
> [ 82.596615] </TASK>
> [ 82.596616] irq event stamp: 975
> [ 82.596618] hardirqs last enabled at (981): [<ffffffff9193aa6d>]
> console_unlock+0x10d/0x130
> [ 82.596621] hardirqs last disabled at (986): [<ffffffff9193aa52>]
> console_unlock+0xf2/0x130
> [ 82.596624] softirqs last enabled at (0): [<ffffffff9188890f>]
> copy_process+0xa8f/0x2080
> [ 82.596626] softirqs last disabled at (0): [<0000000000000000>] 0x0
> [ 82.596628] ---[ end trace 0000000000000000 ]---
It's not entirely clear to me what could be happening here, but it looks
similar to the issue that Marco was fixing here:
https://lore.kernel.org/linux-kselftest/20231128101627.65399-1-marpagan@redhat.com/
Could you test with that fix and see if it still happens?
Thanks!
Maxime
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