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Date:   Mon, 16 Oct 2023 16:13:53 +0300
From:   Dan Carpenter <dan.carpenter@linaro.org>
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     dri-devel@lists.freedesktop.org,
        open list <linux-kernel@vger.kernel.org>,
        lkft-triage@lists.linaro.org,
        kasan-dev <kasan-dev@googlegroups.com>,
        maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>, Arnd Bergmann <arnd@arndb.de>
Subject: Re: BUG: KASAN: slab-use-after-free in drm_connector_cleanup
Message-ID: <1ccaf470-4bc1-4a1f-81b0-2757a4a53bd7@kadam.mountain>
References: <CA+G9fYvJA2HGqzR9LGgq63v0SKaUejHAE6f7+z9cwWN-ourJ_g@mail.gmail.com>
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In-Reply-To: <CA+G9fYvJA2HGqzR9LGgq63v0SKaUejHAE6f7+z9cwWN-ourJ_g@mail.gmail.com>
Precedence: bulk

If I had to guess, I'd say it's an issue in the vc4_mock driver.  It's
crashing somewhere in Subtest: drm_vc4_test_pv_muxing.

regards,
dan carpenter

On Fri, Oct 13, 2023 at 11:44:32PM +0530, Naresh Kamboju wrote:
> Following kasan bug was noticed on arm64 bcm2711-rpi-4-b device running
> Linux next 6.6.0-rc5-next-20231011 with given config.
> 
> This was first noticed on 6.6.0-rc2-next-20230918.
> This is an intermittent issue.
> Links to build and test logs provided.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> 
> Boot log:
> -----
> 
> [  209.991842] Bluetooth: Core ver 2.22
> [  209.996014] NET: Registered PF_BLUETOOTH protocol family
> [  210.002564] Bluetooth: HCI device and connection manager initialized
> [  210.009204] Bluetooth: HCI socket layer initialized
> [  210.014443] Bluetooth: L2CAP socket layer initialized
> [  210.019906] Bluetooth: SCO socket layer initialized
> [  210.175889] KTAP version 1
> [  210.178771] 1..3
> [  210.184030]     KTAP version 1
> [  210.187234]     # Subtest: vc4-pv-muxing-combinations
> [  210.192491]     # module: vc4
> [  210.192572]     1..2
> [  210.197937]         KTAP version 1
> [  210.201544]         # Subtest: drm_vc4_test_pv_muxing
> [  210.218416] Bluetooth: HCI UART driver ver 2.3
> [  210.236869] [drm] Initialized vc4 0.0.0 20140616 for
> drm-kunit-mock-device on minor 1
> [  210.241063] Bluetooth: HCI UART protocol H4 registered
> [  210.320009] Bluetooth: HCI UART protocol LL registered
> [  210.464457] Bluetooth: HCI UART protocol Broadcom registered
> [  210.470871] hci_uart_bcm serial0-0: supply vbat not found, using
> dummy regulator
> [  210.472120] Bluetooth: HCI UART protocol QCA registered
> [  210.480123] hci_uart_bcm serial0-0: supply vddio not found, using
> dummy regulator
> [  210.490971] Bluetooth: HCI UART protocol Marvell registered
> 
> Debian GNU/Linux 12 runner-vwmj3eza-project-40964107-concurrent-0 ttyS0
> 
> runner-vwmj3eza-project-40964107-concurrent-0 login: [  2root
> 10.623188] cfg80211: Loading compiled-in X.509 certificates for
> regulatory database
> [  210.658616] ==================================================================
> [  210.666006] BUG: KASAN: slab-use-after-free in
> drm_connector_cleanup+0x30/0x488 drm
> [  210.675144] Read of size 8 at addr ffff000113a8e0a8 by task
> kunit_try_catch/1750
> [  210.682685]
> [  210.684219] CPU: 1 PID: 1750 Comm: kunit_try_catch Tainted: G    B
>           N 6.6.0-rc5-next-20231011 #1
> [  210.694056] Hardware name: Raspberry Pi 4 Model B (DT)
> [  210.699323] Call trace:
> r[ 210.701824] dump_backtrace (arch/arm64/kernel/stacktrace.c:235)
> [  210.705757] show_stack (arch/arm64/kernel/stacktrace.c:242)
> [  210.709160] dump_stack_lvl (lib/dump_stack.c:107)
> [  210.712917] print_report (mm/kasan/report.c:365 mm/kasan/report.c:475)
> [  210.716560] kasan_report (mm/kasan/report.c:590)
> o[ 210.720201] __asan_load8 (mm/kasan/generic.c:260)
> o[ 210.723827] drm_connector_cleanup+0x30/0x488 drm
> [  210.729265] drm_connector_cleanup_action+0x1c/0x30 drm
> t[ 210.735228] drm_managed_release+0x128/0x228 drm
> [  210.740570] drm_dev_put.part.0+0xb4/0xf8 drm
> [  210.742616] Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
> [  210.745649] devm_drm_dev_init_release+0x1c/0x38 drm
> [  210.756667] devm_action_release (drivers/base/devres.c:722)
> [  210.760840] release_nodes (drivers/base/devres.c:506)
> [  210.764569] devres_release_all (drivers/base/devres.c:535)
> [  210.765145] platform regulatory.0: Direct firmware load for
> regulatory.db failed with error -2
> [  210.768737] device_unbind_cleanup (drivers/base/dd.c:551)
> [  210.768759] device_release_driver_internal (drivers/base/dd.c:1280
> drivers/base/dd.c:1295)
> [  210.768775] device_release_driver (drivers/base/dd.c:1319)
> [  210.768788] bus_remove_device (include/linux/kobject.h:193
> drivers/base/base.h:73 drivers/base/bus.c:581)
> [  210.768801] device_del (drivers/base/core.c:3815)
> [  210.768812] platform_device_del.part.0 (drivers/base/platform.c:753)
> [  210.768824] platform_device_del (drivers/base/platform.c:764)
> 
> [  210.768834] kunit_action_platform_device_del+0x18/0x30 drm_kunit_helpers
> [  210.810264] cfg80211: failed to load regulatory.db
> [  210.815438] __kunit_action_free (lib/kunit/resource.c:92)
> [  210.815460] kunit_remove_resource (include/kunit/resource.h:120
> include/linux/kref.h:65 include/kunit/resource.h:138
> lib/kunit/resource.c:59 lib/kunit/resource.c:48)
> [  210.815474] kunit_cleanup (lib/kunit/test.c:815 (discriminator 1))
> [  210.815486] kunit_try_run_case_cleanup (lib/kunit/test.c:412)
> [  210.815499] kunit_generic_run_threadfn_adapter (lib/kunit/try-catch.c:30)
> [  210.815514] kthread (kernel/kthread.c:388)
> [  210.815526] ret_from_fork (arch/arm64/kernel/entry.S:858)
> [  210.815540]
> [  210.815544] Allocated by task 1745:
> [  210.815552] kasan_save_stack (mm/kasan/common.c:46)
> [  210.815567] kasan_set_track (mm/kasan/common.c:52 (discriminator 1))
> [  210.815579] kasan_save_alloc_info (mm/kasan/generic.c:512)
> [  210.815592] __kasan_kmalloc (mm/kasan/common.c:374 mm/kasan/common.c:383)
> [  210.815603] __kmalloc (include/linux/kasan.h:198
> mm/slab_common.c:1004 mm/slab_common.c:1017)
> [  210.815613] kunit_kmalloc_array (include/linux/slab.h:637
> lib/kunit/test.c:779)
> [  210.815625] vc4_dummy_output+0xac/0x228 vc4
> [  210.882798] __mock_device+0x24c/0x4b0 vc4
> [  210.887335] vc4_mock_device+0x1c/0x30 vc4
> [  210.891871] vc4_pv_muxing_test_init+0xc8/0x248 vc4
> [  210.897199] kunit_try_run_case (lib/kunit/test.c:351 lib/kunit/test.c:400)
> [  210.901375] kunit_generic_run_threadfn_adapter (lib/kunit/try-catch.c:30)
> [  210.906869] kthread (kernel/kthread.c:388)
> [  210.910156] ret_from_fork (arch/arm64/kernel/entry.S:858)
> [  210.913797]
> [  210.915309] Freed by task 1750:
> [  210.918498] kasan_save_stack (mm/kasan/common.c:46)
> [  210.922405] kasan_set_track (mm/kasan/common.c:52 (discriminator 1))
> [  210.926220] kasan_save_free_info (include/linux/kasan.h:60
> mm/kasan/generic.c:524)
> [  210.930476] __kasan_slab_free (mm/kasan/common.c:238
> mm/kasan/common.c:200 mm/kasan/common.c:244)
> [  210.934645] __kmem_cache_free (mm/slub.c:1826 (discriminator 2)
> mm/slub.c:3809 (discriminator 2) mm/slub.c:3822 (discriminator 2))
> [  210.938812] kfree (mm/slab_common.c:1054)
> [  210.941835] __kunit_action_free (lib/kunit/resource.c:92)
> [  210.946004] kunit_remove_resource (include/kunit/resource.h:120
> include/linux/kref.h:65 include/kunit/resource.h:138
> lib/kunit/resource.c:59 lib/kunit/resource.c:48)
> [  210.950525] kunit_cleanup (lib/kunit/test.c:815 (discriminator 1))
> [  210.954166] kunit_try_run_case_cleanup (lib/kunit/test.c:412)
> [  210.958951] kunit_generic_run_threadfn_adapter (lib/kunit/try-catch.c:30)
> [  210.959940] Bluetooth: hci0: BCM: chip id 107
> [  210.964444] kthread (kernel/kthread.c:388)
> [  210.964455] ret_from_fork (arch/arm64/kernel/entry.S:858)
> [  210.964466]
> [  210.964470] The buggy address belongs to the object at ffff000113a8e000
> [  210.964470]  which belongs to the cache kmalloc-2k of size 2048
> [  210.964481] The buggy address is located 168 bytes inside of
> [  210.964481]  freed 2048-byte region [ffff000113a8e000, ffff000113a8e800)
> [  210.964492]
> [  210.969465] Bluetooth: hci0: BCM: features 0x2f
> [  210.972170] The buggy address belongs to the physical page:
> [  210.972177] page:00000000a86866c3 refcount:1 mapcount:0
> mapping:0000000000000000 index:0x0 pfn:0x113a88
> [  210.972190] head:00000000a86866c3 order:3 entire_mapcount:0
> nr_pages_mapped:0 pincount:0
> [  210.972199] flags:
> 0xbfffc0000000840(slab|head|node=0|zone=2|lastcpupid=0xffff)
> [  210.972214] page_type: 0xffffffff()
> [  210.972227] raw: 0bfffc0000000840 ffff000100002f00 dead000000000122
> 0000000000000000
> [  210.982178] Bluetooth: hci0: BCM4345C0
> [  210.990038] raw: 0000000000000000 0000000000080008 00000001ffffffff
> 0000000000000000
> [  210.990046] page dumped because: kasan: bad access detected
> [  210.990052]
> [  210.990055] Memory state around the buggy address:
> [  211.002660] Bluetooth: hci0: BCM4345C0 (003.001.025) build 0000
> [  211.004080]  ffff000113a8df80: fc fc fc fc fc fc fc fc fc fc fc fc
> fc fc fc fc
> [  211.009183] Bluetooth: hci0: BCM: firmware Patch file not found, tried:
> [  211.014313]  ffff000113a8e000: fa fb fb fb fb fb fb fb fb fb fb fb
> fb fb fb fb
> [  211.014321] >ffff000113a8e080: fb fb fb fb fb fb fb fb fb fb fb fb
> fb fb fb fb
> [  211.014328]                                   ^
> [  211.014334]  ffff000113a8e100: fb fb fb fb fb fb fb fb fb fb fb fb
> fb fb fb fb
> [  211.014343]  ffff000113a8e180: fb fb fb fb fb fb fb fb fb fb fb fb
> fb fb fb fb
> [  211.014349] ==================================================================
> [  211.023911] Bluetooth: hci0: BCM: 'brcm/BCM4345C0.raspberrypi,4-model-b.hcd'
> [  211.036370] Unable to handle kernel NULL pointer dereference at
> virtual address 0000000000000001
> [  211.040035] Bluetooth: hci0: BCM: 'brcm/BCM4345C0.hcd'
> [  211.044474] Mem abort info:
> [  211.056083] Bluetooth: hci0: BCM: 'brcm/BCM.raspberrypi,4-model-b.hcd'
> [  211.063048]   ESR = 0x0000000096000004
> [  211.063068]   EC = 0x25: DABT (current EL), IL = 32 bits
> [  211.063082]   SET = 0, FnV = 0
> [  211.063090]   EA = 0, S1PTW = 0
> [  211.063098]   FSC = 0x04: level 0 translation fault
> [  211.063108] Data abort info:
> [  211.063114]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
> [  211.063123]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
> [  211.063133]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
> [  211.063142] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000105434000
> [  211.063153] [0000000000000001] pgd=0000000000000000, p4d=0000000000000000
> [  211.063181] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
> [  211.063192] Modules linked in: brcmutil xhci_pci_renesas
> raspberrypi_cpufreq cfg80211 hci_uart vc4(+) btqca btbcm bluetooth
> snd_soc_hdmi_codec reset_raspberrypi cec clk_raspberrypi
> raspberrypi_hwmon drm_dma_helper crct10dif_ce drm_kunit_helpers rfkill
> drm_display_helper bcm2711_thermal i2c_bcm2835 pwm_bcm2835 v3d
> drm_kms_helper drm_shmem_helper gpu_sched pcie_brcmstb fuse drm
> backlight dm_mod ip_tables x_tables
> [  211.063341] CPU: 1 PID: 1750 Comm: kunit_try_catch Tainted: G    B
>           N 6.6.0-rc5-next-20231011 #1
> [  211.063355] Hardware name: Raspberry Pi 4 Model B (DT)
> [  211.063362] pstate: 40000005 (nZcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [  211.063373] pc : drm_mode_object_unregister+0x38/0xe0 drm
> [  211.063870] lr : drm_mode_object_unregister+0x38/0xe0 drm
> [  211.064346] sp : ffff8000887e78e0
> [  211.064352] x29: ffff8000887e78e0 x28: ffff000101254180 x27: dead000000000122
> [  211.064374] x26: ffff00010b82f810 x25: dead000000000100 x24: ffff000105dda780
> [  211.064393] x23: ffff000113a8e058 x22: ffff000113a8e000 x21: 0000000000000001
> [  211.064411] x20: ffff000113a8e018 x19: ffff000105dda780 x18: 0000000000000000
> [  211.064429] x17: 0000000000000000 x16: 0000000000000000 x15: ffff8000809cb4a0
> [  211.064446] x14: ffff80007f89e258 x13: 00000000f1f1f1f1 x12: 00000000f2f20000
> [  211.064464] x11: dfff800000000000 x10: ffff7000110fcf16 x9 : ffff80007f772094
> [  211.064482] x8 : ffff8000887e78d0 x7 : 0000000000000000 x6 : 0000000000000008
> Linux runner-vwmj3eza-project-40964107-concurrent-0
> 6.6.0-rc5-next-20231011 #1 SMP PREEMPT @1697009423 aarch64
> 
> The programs i[  211.064499] x5 : 0000000000000000 x4 :
> ffff000103806900 x3 : 0000000000000000
> [  211.064515] x2 : 0000000000000001 x1 : ffff80008762ed60 x0 : 0000000000000000
> [  211.064532] Call trace:
> [  211.064538] drm_mode_object_unregister+0x38/0xe0 drm
> [  211.065018] drm_encoder_cleanup+0x8c/0x128 drm
> [  211.065495] drmm_encoder_alloc_release+0x34/0x60 drm
> [  211.072100] Bluetooth: hci0: BCM: 'brcm/BCM.hcd'
> [  211.073130] drm_managed_release+0x128/0x228 drm
> [  211.413574] drm_dev_put.part.0+0xb4/0xf8 drm
> [  211.418639] devm_drm_dev_init_release+0x1c/0x38 drm
> [  211.424301] devm_action_release (drivers/base/devres.c:722)
> [  211.428470] release_nodes (drivers/base/devres.c:506)
> [  211.432189] devres_release_all (drivers/base/devres.c:535)
> [  211.436349] device_unbind_cleanup (drivers/base/dd.c:551)
> [  211.440688] device_release_driver_internal (drivers/base/dd.c:1280
> drivers/base/dd.c:1295)
> [  211.445996] device_release_driver (drivers/base/dd.c:1319)
> [  211.450333] bus_remove_device (include/linux/kobject.h:193
> drivers/base/base.h:73 drivers/base/bus.c:581)
> [  211.454494] device_del (drivers/base/core.c:3815)
> [  211.458036] platform_device_del.part.0 (drivers/base/platform.c:753)
> [  211.462813] platform_device_del (drivers/base/platform.c:764)
> [  211.466972] kunit_action_platform_device_del+0x18/0x30 drm_kunit_helpers
> [  211.474065] __kunit_action_free (lib/kunit/resource.c:92)
> [  211.478228] kunit_remove_resource (include/kunit/resource.h:120
> include/linux/kref.h:65 include/kunit/resource.h:138
> lib/kunit/resource.c:59 lib/kunit/resource.c:48)
> [  211.482741] kunit_cleanup (lib/kunit/test.c:815 (discriminator 1))
> [  211.486373] kunit_try_run_case_cleanup (lib/kunit/test.c:412)
> [  211.491151] kunit_generic_run_threadfn_adapter (lib/kunit/try-catch.c:30)
> [  211.496637] kthread (kernel/kthread.c:388)
> [  211.499914] ret_from_fork (arch/arm64/kernel/entry.S:858)
> [ 211.503554] Code: 9435d388 f9401a75 aa1503e0 9435d385 (f94002a0)
> All code
> ========
>    0: 9435d388 bl 0xd74e20
>    4: f9401a75 ldr x21, [x19, #48]
>    8: aa1503e0 mov x0, x21
>    c: 9435d385 bl 0xd74e20
>   10:* f94002a0 ldr x0, [x21] <-- trapping instruction
> 
> Code starting with the faulting instruction
> ===========================================
>    0: f94002a0 ldr x0, [x21]
> [  211.509739] ---[ end trace 0000000000000000 ]---
> [  211.531417] brcmfmac: brcmf_fw_alloc_request: using
> brcm/brcmfmac43455-sdio for chip BCM4345/6
> [  211.540473] brcmfmac mmc0:0001:1: Direct firmware load for
> brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.bin failed with error -2
> [  211.555864] brcmfmac mmc0:0001:1: Direct firmware load for
> brcm/brcmfmac43455-sdio.bin failed with error -2
> [  211.562623] xhci_hcd 0000:01:00.0: xHCI Host Controller
> [  211.572059] xhci_hcd 0000:01:00.0: new USB bus registered, assigned
> bus number 1
> [  211.581888] xhci_hcd 0000:01:00.0: hcc params 0x002841eb hci
> version 0x100 quirks 0x0000000000000890
> [  211.593596] xhci_hcd 0000:01:00.0: xHCI Host Controller
> [  211.599291] xhci_hcd 0000:01:00.0: new USB bus registered, assigned
> bus number 2
> [  211.606923] xhci_hcd 0000:01:00.0: Host supports USB 3.0 SuperSpeed
> [  211.616825] hub 1-0:1.0: USB hub found
> [  211.621005] hub 1-0:1.0: 1 port detected
> [  211.631045] hub 2-0:1.0: USB hub found
> [  211.635097] hub 2-0:1.0: 4 ports detected
> [  211.879995] usb 1-1: new high-speed USB device number 2 using xhci_hcd
> [  212.048581] hub 1-1:1.0: USB hub found
> [  212.052854] hub 1-1:1.0: 4 ports detected
> [  212.170763] usb 2-2: new SuperSpeed USB device number 2 using xhci_hcd
> [  212.201876] usb-storage 2-2:1.0: USB Mass Storage device detected
> [  212.209511] usb-storage 2-2:1.0: Quirks match for vid 174c pid 55aa: 400000
> [  212.217225] scsi host0: usb-storage 2-2:1.0
> [  212.586463] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000):
> clkctl 0x50
> [  213.228696] scsi 0:0:0:0: Direct-Access     ASMT     ASM105x
>   0    PQ: 0 ANSI: 6
> [  213.246921] sd 0:0:0:0: [sda] 234455040 512-byte logical blocks:
> (120 GB/112 GiB)
> [  213.255923] sd 0:0:0:0: [sda] Write Protect is off
> [  213.260998] sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00
> [  213.267569] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [  213.289202] sd 0:0:0:0: [sda] Attached SCSI disk
> [  513.002290]     # drm_vc4_test_pv_muxing: try timed out
> [  513.007730] ------------[ cut here ]------------
> [  513.012479] refcount_t: addition on 0; use-after-free.
> [  513.017805] WARNING: CPU: 1 PID: 1702 at lib/refcount.c:25
> refcount_warn_saturate (lib/refcount.c:25 (discriminator 1))
> [  513.026495] Modules linked in: brcmfmac xhci_pci brcmutil
> xhci_pci_renesas raspberrypi_cpufreq cfg80211 hci_uart vc4(+) btqca
> btbcm bluetooth snd_soc_hdmi_codec reset_raspberrypi cec
> clk_raspberrypi raspberrypi_hwmon drm_dma_helper crct10dif_ce
> drm_kunit_helpers rfkill drm_display_helper bcm2711_thermal
> i2c_bcm2835 pwm_bcm2835 v3d drm_kms_helper drm_shmem_helper gpu_sched
> pcie_brcmstb fuse drm backlight dm_mod ip_tables x_tables
> [  513.065278] CPU: 1 PID: 1702 Comm: (udev-worker) Tainted: G    B D
>         N 6.6.0-rc5-next-20231011 #1
> [  513.074909] Hardware name: Raspberry Pi 4 Model B (DT)
> [  513.080125] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [  513.087198] pc : refcount_warn_saturate (lib/refcount.c:25 (discriminator 1))
> [  513.092156] lr : refcount_warn_saturate (lib/refcount.c:25 (discriminator 1))
> [  513.097114] sp : ffff8000880e70c0
> [  513.100477] x29: ffff8000880e70c0 x28: ffff8000820cea00 x27: 0000000000000000
> [  513.107742] x26: ffff8000880e73f8 x25: ffff000103806900 x24: ffff8000880e73d0
> [  513.115006] x23: ffff8000880e7410 x22: ffff000101181580 x21: ffff000103806928
> [  513.122268] x20: ffff000103806928 x19: 0000000000000002 x18: 0000000000000000
> [  513.129530] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
> [  513.136790] x14: 0000000000000000 x13: 2e656572662d7265 x12: ffff70001101cdb9
> [  513.144051] x11: 1ffff0001101cdb8 x10: ffff70001101cdb8 x9 : ffff8000801a2350
> [  513.151313] x8 : 00008fffeefe3248 x7 : ffff8000880e6dc7 x6 : 0000000000000001
> [  513.158574] x5 : ffff8000880e6dc0 x4 : ffff70001101cdb9 x3 : dfff800000000000
> [  513.165836] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00010c1cb480
> [  513.173096] Call trace:
> [  513.175577] refcount_warn_saturate (lib/refcount.c:25 (discriminator 1))
> [  513.180184] kthread_stop (kernel/kthread.c:76 kernel/kthread.c:704)
> [  513.183907] kunit_try_catch_run (lib/kunit/try-catch.c:81)
> [  513.188251] kunit_run_case_catch_errors (lib/kunit/test.c:501)
> [  513.193300] kunit_run_tests (lib/kunit/test.c:606)
> [  513.197290] __kunit_test_suites_init (lib/kunit/test.c:675
> (discriminator 1) lib/kunit/test.c:664 (discriminator 1))
> [  513.201897] kunit_exec_run_tests (lib/kunit/executor.c:270)
> [  513.206147] kunit_module_notify (lib/kunit/test.c:724 lib/kunit/test.c:760)
> [  513.210490] notifier_call_chain (kernel/notifier.c:93)
> [  513.214742] blocking_notifier_call_chain_robust
> (kernel/notifier.c:128 kernel/notifier.c:353 kernel/notifier.c:341)
> [  513.220407] load_module (include/linux/notifier.h:207
> kernel/module/main.c:2740 kernel/module/main.c:2921)
> [  513.224221] init_module_from_file (kernel/module/main.c:3099)
> [  513.228651] __arm64_sys_finit_module (kernel/module/main.c:3140
> kernel/module/main.c:3161 kernel/module/main.c:3144
> kernel/module/main.c:3144)
> [  513.233434] invoke_syscall (arch/arm64/kernel/syscall.c:37
> arch/arm64/kernel/syscall.c:51)
> [  513.237248] el0_svc_common.constprop.0 (arch/arm64/kernel/syscall.c:143)
> [  513.242209] do_el0_svc (arch/arm64/kernel/syscall.c:156)
> [  513.245576] el0_svc (arch/arm64/kernel/entry-common.c:133
> arch/arm64/kernel/entry-common.c:144
> arch/arm64/kernel/entry-common.c:679)
> [  513.248681] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:697)
> [  513.253108] el0t_64_sync (arch/arm64/kernel/entry.S:595)
> [  513.256830] ---[ end trace 0000000000000000 ]---
> [  513.261615] Unable to handle kernel NULL pointer dereference at
> virtual address 0000000000000000
> [  513.270590] Mem abort info:
> [  513.273441]   ESR = 0x0000000096000004
> [  513.277305]   EC = 0x25: DABT (current EL), IL = 32 bits
> [  513.282754]   SET = 0, FnV = 0
> [  513.285870]   EA = 0, S1PTW = 0
> [  513.289109]   FSC = 0x04: level 0 translation fault
> [  513.294131] Data abort info:
> [  513.297069]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
> [  513.302677]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
> [  513.307866]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
> [  513.313317] user pgtable: 4k pages, 48-bit VAs, pgdp=000000010c00b000
> [  513.319915] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000
> [  513.326880] Internal error: Oops: 0000000096000004 [#2] PREEMPT SMP
> [  513.333260] Modules linked in: brcmfmac xhci_pci brcmutil
> xhci_pci_renesas raspberrypi_cpufreq cfg80211 hci_uart vc4(+) btqca
> btbcm bluetooth snd_soc_hdmi_codec reset_raspberrypi cec
> clk_raspberrypi raspberrypi_hwmon drm_dma_helper crct10dif_ce
> drm_kunit_helpers rfkill drm_display_helper bcm2711_thermal
> i2c_bcm2835 pwm_bcm2835 v3d drm_kms_helper drm_shmem_helper gpu_sched
> pcie_brcmstb fuse drm backlight dm_mod ip_tables x_tables
> [  513.371993] CPU: 1 PID: 1702 Comm: (udev-worker) Tainted: G    B D
> W        N 6.6.0-rc5-next-20231011 #1
> [  513.381625] Hardware name: Raspberry Pi 4 Model B (DT)
> [  513.386837] pstate: 40000005 (nZcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [  513.393907] pc : kthread_stop
> (arch/arm64/include/asm/atomic_ll_sc.h:203 (discriminator 2)
> arch/arm64/include/asm/atomic.h:65 (discriminator 2)
> include/linux/atomic/atomic-arch-fallback.h:3784 (discriminator 2)
> include/linux/atomic/atomic-long.h:1069 (discriminator 2)
> include/asm-generic/bitops/atomic.h:18 (discriminator 2)
> include/asm-generic/bitops/instrumented-atomic.h:29 (discriminator 2)
> kernel/kthread.c:705 (discriminator 2))
> [  513.397987] lr : kthread_stop
> (arch/arm64/include/asm/alternative-macros.h:232
> arch/arm64/include/asm/lse.h:21 arch/arm64/include/asm/atomic.h:65
> include/linux/atomic/atomic-arch-fallback.h:3784
> include/linux/atomic/atomic-long.h:1069
> include/asm-generic/bitops/atomic.h:18
> include/asm-generic/bitops/instrumented-atomic.h:29
> kernel/kthread.c:705)
> [  513.401968] sp : ffff8000880e70e0
> [  513.405329] x29: ffff8000880e70e0 x28: ffff8000820cea00 x27: 0000000000000000
> [  513.412587] x26: ffff8000880e73f8 x25: ffff000103806900 x24: ffff8000880e73d0
> [  513.419842] x23: ffff8000880e7410 x22: ffff000101181580 x21: ffff000103806928
> [  513.427098] x20: 0000000000000000 x19: ffff000103806900 x18: 0000000000000000
> [  513.434352] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
> [  513.441606] x14: 0000000000000000 x13: 2e656572662d7265 x12: ffff70001101cdb9
> [  513.448860] x11: 1ffff0001101cdb8 x10: ffff70001101cdb8 x9 : ffff8000801a2350
> [  513.456115] x8 : ffff8000880e70c0 x7 : 0000000000000000 x6 : 0000000000000001
> [  513.463368] x5 : 0000000000000000 x4 : ffff00010c1cb480 x3 : 0000000000000000
> [  513.470622] x2 : 0000000000000001 x1 : ffff80008762ed60 x0 : 0000000000000001
> [  513.477876] Call trace:
> [  513.480354] kthread_stop (arch/arm64/include/asm/atomic_ll_sc.h:203
> (discriminator 2) arch/arm64/include/asm/atomic.h:65 (discriminator 2)
> include/linux/atomic/atomic-arch-fallback.h:3784 (discriminator 2)
> include/linux/atomic/atomic-long.h:1069 (discriminator 2)
> include/asm-generic/bitops/atomic.h:18 (discriminator 2)
> include/asm-generic/bitops/instrumented-atomic.h:29 (discriminator 2)
> kernel/kthread.c:705 (discriminator 2))
> [  513.484073] kunit_try_catch_run (lib/kunit/try-catch.c:81)
> [  513.488417] kunit_run_case_catch_errors (lib/kunit/test.c:501)
> [  513.493461] kunit_run_tests (lib/kunit/test.c:606)
> [  513.497445] __kunit_test_suites_init (lib/kunit/test.c:675
> (discriminator 1) lib/kunit/test.c:664 (discriminator 1))
> [  513.502047] kunit_exec_run_tests (lib/kunit/executor.c:270)
> [  513.506292] kunit_module_notify (lib/kunit/test.c:724 lib/kunit/test.c:760)
> [  513.510630] notifier_call_chain (kernel/notifier.c:93)
> [  513.514878] blocking_notifier_call_chain_robust
> (kernel/notifier.c:128 kernel/notifier.c:353 kernel/notifier.c:341)
> [  513.520537] load_module (include/linux/notifier.h:207
> kernel/module/main.c:2740 kernel/module/main.c:2921)
> [  513.524345] init_module_from_file (kernel/module/main.c:3099)
> [  513.528771] __arm64_sys_finit_module (kernel/module/main.c:3140
> kernel/module/main.c:3161 kernel/module/main.c:3144
> kernel/module/main.c:3144)
> [  513.533550] invoke_syscall (arch/arm64/kernel/syscall.c:37
> arch/arm64/kernel/syscall.c:51)
> [  513.537359] el0_svc_common.constprop.0 (arch/arm64/kernel/syscall.c:143)
> [  513.542316] do_el0_svc (arch/arm64/kernel/syscall.c:156)
> [  513.545680] el0_svc (arch/arm64/kernel/entry-common.c:133
> arch/arm64/kernel/entry-common.c:144
> arch/arm64/kernel/entry-common.c:679)
> [  513.548782] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:697)
> [  513.553205] el0t_64_sync (arch/arm64/kernel/entry.S:595)
> [ 513.556928] Code: c8017e60 35ffffa1 17ffffae f9800291 (c85f7e80)
> All code
> ========
>    0: c8017e60 stxr w1, x0, [x19]
>    4: 35ffffa1 cbnz w1, 0xfffffffffffffff8
>    8: 17ffffae b 0xfffffffffffffec0
>    c: f9800291 prfm pstl1strm, [x20]
>   10:* c85f7e80 ldxr x0, [x20] <-- trapping instruction
> 
> Code starting with the faulting instruction
> ===========================================
>    0: c85f7e80 ldxr x0, [x20]
> [  513.563112] ---[ end trace 0000000000000000 ]---
> 
> Links:
>  - build: https://storage.tuxsuite.com/public/linaro/lkft/builds/2WblMBAz9gtucRiTnLMgK0KAbYV/
> - config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2WblMBAz9gtucRiTnLMgK0KAbYV/config
>  - https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/2VZLML9vVYDASh7HR2Dk8jsg87c
>  - https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/2WblOoPXGMwdOosTSRRaWPaIVp6
> 
> --
> Linaro LKFT
> https://lkft.linaro.org