Re: [BUG] KASAN: slab-use-after-free in au0828_dvb_register

From: Pei Xiao

Date: Sun May 31 2026 - 23:39:00 EST

在 2026/5/30 03:22, Shuangpeng 写道:
>
>> On May 29, 2026, at 04:30, xiaopeitux@xxxxxxxxxxx wrote:
>>
>> From: Pei Xiao <xiaopei01@xxxxxxxxxx>
>>
>>> Hi Kernel Maintainers,
>>>
>>> We hit the following KASAN report while testing current upstream kernel:
>>>
>>> KASAN: slab-use-after-free in au0828_dvb_register
>>>
>>> on commit: e8c2f9fdadee7cbc75134dc463c1e0d856d6e5c7 (May 25 2026)
>>>
>>> The reproducer and .config files are here.
>>> https://gist.github.com/shuangpengbai/c31163f8ef234ba4fe85038c2f97f9cc
>>>
>>> I’m happy to test debug patches or provide additional information.
>>>
>>> Reported-by: Shuangpeng Bai <shuangpeng.kernel@xxxxxxxxx>
>> Can you help post all the crash logs?
>> Does the kernel log have this print:
>> "The frontend of your DVB/ATSC card isn't supported yet."
> I did not see this message in log.
>
>
>> Please help post all the logs, thank you!
> Thank you for taking a look. All terminal outputs after running the reproducer:
au0828_usb_probe
au0828_dvb_register
dvb_attach(xc5000_attach, dvb->frontend,
dvb_register
if (dvb->frontend->ops.release)
dvb->frontend->ops.release(dvb->frontend);

dvb_register
result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
pr_err("dvb_register_frontend failed (errno = %d)\n",//-12, no kref_init(&fe->refcount);，fe->frontend_priv is NULL
result);
goto fail_frontend

fail_frontend:
dvb_frontend_detach(dvb->frontend);

dvb_frontend_detach:
dvb_frontend_put
__dvb_frontend_free
dvb_frontend_invoke_release(fe, fe->ops.release);

static void dvb_frontend_invoke_release(struct dvb_frontend *fe,
void (*release)(struct dvb_frontend *fe))
{
if (release) {
release(fe);
#ifdef CONFIG_MEDIA_ATTACH
dvb_detach(release);
#endif
}
}

au8522_attach
.release = au8522_release,
au8522_release_state
kfree(state);//have free

How did this problem occur, and is the probability of it occurring high?
so we can remove in au0828_dvb_register function follow lines to fix this UAF bug?

ret = dvb_register(dev);
if (ret < 0) {
// if (dvb->frontend->ops.release)
// dvb->frontend->ops.release(dvb->frontend);
// dvb->frontend = NULL;
return ret;
}
Could you please help test this modified code?
> [ 64.807294][ T42] usb 3-1: new high-speed USB device number 2 using dummy_hcd
> [ 64.958989][ T42] usb 3-1: New USB device found, idVendor=0fe9, idProduct=d620, bcdDevice= 1.00
> [ 64.961560][ T42] usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> [ 65.351442][ T42] au0828: i2c bus registered
> [ 65.634777][ T42] au8522 1-0047: creating new instance
> [ 65.655406][ T42] DVB: Unable to find symbol xc5000_attach()
> [ 65.656022][ T42] dvbdev: DVB: registering new adapter (au0828)
> [ 65.656632][ T42] au0828: dvb_register_frontend failed (errno = -12)
> [ 65.658957][ T42] au8522 1-0047: destroying instance
> [ 65.659499][ T42] ==================================================================
> [ 65.660261][ T42] BUG: KASAN: slab-use-after-free in au0828_dvb_register+0x1280/0x15f0
> [ 65.661023][ T42] Read of size 8 at addr ffff8881685f4118 by task kworker/1:1/42
> [ 65.661742][ T42]
> [ 65.661973][ T42] CPU: 1 UID: 0 PID: 42 Comm: kworker/1:1 Not tainted 7.1.0-rc5-00006-ge8c2f9fdadee #16 PREEMPT(
> [ 65.661978][ T42] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debia4
> [ 65.661981][ T42] Workqueue: usb_hub_wq hub_event
> [ 65.661988][ T42] Call Trace:
> [ 65.661991][ T42] <TASK>
> [ 65.661993][ T42] dump_stack_lvl+0x26/0x80
> [ 65.661999][ T42] print_report+0x16a/0x5d0
> [ 65.662013][ T42] kasan_report+0xc3/0x100
> [ 65.662019][ T42] au0828_dvb_register+0x1280/0x15f0
> [ 65.662026][ T42] au0828_usb_probe+0x353/0x4b0
> [ 65.662029][ T42] usb_probe_interface+0x4aa/0xa40
> [ 65.662034][ T42] really_probe+0x259/0x9a0
> [ 65.662041][ T42] __driver_probe_device+0x18b/0x370
> [ 65.662045][ T42] driver_probe_device+0x4b/0x1e0
> [ 65.662049][ T42] __device_attach_driver+0x1d0/0x2f0
> [ 65.662055][ T42] bus_for_each_drv+0x22a/0x260
> [ 65.663294][ T42] __device_attach+0x25a/0x480
> [ 65.663321][ T42] device_initial_probe+0x68/0xa0
> [ 65.663324][ T42] bus_probe_device+0x10a/0x1d0
> [ 65.663328][ T42] device_add+0x56b/0x9c0
> [ 65.663332][ T42] usb_set_configuration+0x1775/0x1d80
> [ 65.663337][ T42] usb_generic_driver_probe+0x61/0xf0
> [ 65.663343][ T42] usb_probe_device+0xd3/0x2a0
> [ 65.663346][ T42] really_probe+0x259/0x9a0
> [ 65.663350][ T42] __driver_probe_device+0x18b/0x370
> [ 65.663354][ T42] driver_probe_device+0x4b/0x1e0
> [ 65.663357][ T42] __device_attach_driver+0x1d0/0x2f0
> [ 65.663363][ T42] bus_for_each_drv+0x22a/0x260
> [ 65.663381][ T42] __device_attach+0x25a/0x480
> [ 65.663403][ T42] device_initial_probe+0x68/0xa0
> [ 65.663405][ T42] bus_probe_device+0x10a/0x1d0
> [ 65.663409][ T42] device_add+0x56b/0x9c0
> [ 65.663412][ T42] usb_new_device+0xbdd/0x1830
> [ 65.663423][ T42] hub_event+0x2358/0x4090
> [ 65.663443][ T42] process_scheduled_works+0x73d/0xed0
> [ 65.663451][ T42] worker_thread+0x7d6/0xb60
> [ 65.663459][ T42] kthread+0x322/0x410
> [ 65.663470][ T42] ret_from_fork+0x285/0x750
> [ 65.663485][ T42] ret_from_fork_asm+0x1a/0x30
> [ 65.663491][ T42] </TASK>
> [ 65.663493][ T42]
> [ 65.702422][ T42] Freed by task 42 on cpu 1 at 65.659497s:
> [ 65.702994][ T42] kasan_save_track+0x2e/0x90
> [ 65.703471][ T42] kasan_save_free_info+0x3c/0x50
> [ 65.703965][ T42] __kasan_slab_free+0x36/0x60
> [ 65.704450][ T42] kfree+0x154/0x450
> [ 65.704839][ T42] au8522_release_state+0x1b6/0x210
> [ 65.705364][ T42] dvb_frontend_put+0x12a/0x170
> [ 65.705848][ T42] au0828_dvb_register+0xfd9/0x15f0
> [ 65.706373][ T42] au0828_usb_probe+0x353/0x4b0
> [ 65.706854][ T42] usb_probe_interface+0x4aa/0xa40
> [ 65.707373][ T42] really_probe+0x259/0x9a0
> [ 65.707822][ T42] __driver_probe_device+0x18b/0x370
> [ 65.708347][ T42] driver_probe_device+0x4b/0x1e0
> [ 65.708845][ T42] __device_attach_driver+0x1d0/0x2f0
> [ 65.709383][ T42] bus_for_each_drv+0x22a/0x260
> [ 65.709864][ T42] __device_attach+0x25a/0x480
> [ 65.710339][ T42] device_initial_probe+0x68/0xa0
> [ 65.710836][ T42] bus_probe_device+0x10a/0x1d0
> [ 65.711323][ T42] device_add+0x56b/0x9c0
> [ 65.711750][ T42] usb_set_configuration+0x1775/0x1d80
> [ 65.712294][ T42] usb_generic_driver_probe+0x61/0xf0
> [ 65.712822][ T42] usb_probe_device+0xd3/0x2a0
> [ 65.713305][ T42] really_probe+0x259/0x9a0
> [ 65.713752][ T42] __driver_probe_device+0x18b/0x370
> [ 65.714282][ T42] driver_probe_device+0x4b/0x1e0
> [ 65.714779][ T42] __device_attach_driver+0x1d0/0x2f0
> [ 65.715313][ T42] bus_for_each_drv+0x22a/0x260
> [ 65.715794][ T42] __device_attach+0x25a/0x480
> [ 65.716271][ T42] device_initial_probe+0x68/0xa0
> [ 65.716767][ T42] bus_probe_device+0x10a/0x1d0
> [ 65.717262][ T42] device_add+0x56b/0x9c0
> [ 65.717690][ T42] usb_new_device+0xbdd/0x1830
> [ 65.717869][ C0] clocksource: Watchdog remote CPU 1 read timed out
> [ 65.718172][ T42] hub_event+0x2358/0x4090
> [ 65.718177][ T42] process_scheduled_works+0x73d/0xed0
> [ 65.718180][ T42] worker_thread+0x7d6/0xb60
> [ 65.718183][ T42] kthread+0x322/0x410
> [ 65.718187][ T42] ret_from_fork+0x285/0x750
> [ 65.718189][ T42] ret_from_fork_asm+0x1a/0x30
> [ 65.718192][ T42]
> [ 65.718194][ T42] The buggy address belongs to the object at ffff8881685f4000
> [ 65.718194][ T42] which belongs to the cache kmalloc-4k of size 4096
> [ 65.718197][ T42] The buggy address is located 280 bytes inside of
> [ 65.718197][ T42] freed 4096-byte region [ffff8881685f4000, ffff8881685f5000)
> [ 65.718200][ T42]
> [ 65.718201][ T42] The buggy address belongs to the physical page:
> [ 65.718204][ T42] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1685f0
> [ 65.718209][ T42] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
> [ 65.718212][ T42] flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
> [ 65.729357][ T42] page_type: f5(slab)
> [ 65.729757][ T42] raw: 017ff00000000040 ffff888100042140 dead000000000100 dead000000000122
> [ 65.730603][ T42] raw: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000
> [ 65.731450][ T42] head: 017ff00000000040 ffff888100042140 dead000000000100 dead000000000122
> [ 65.732301][ T42] head: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000
> [ 65.733211][ T42] head: 017ff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
> [ 65.734064][ T42] head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
> [ 65.734922][ T42] page dumped because: kasan: bad access detected
> [ 65.735562][ T42] page_owner tracks the page as allocated
> [ 65.736133][ T42] page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__G2
> [ 65.738177][ T42] post_alloc_hook+0x152/0x180
> [ 65.738654][ T42] get_page_from_freelist+0x3996/0x3b50
> [ 65.739207][ T42] __alloc_frozen_pages_noprof+0x243/0x750
> [ 65.739783][ T42] allocate_slab+0x76/0x5e0
> [ 65.740242][ T42] refill_objects+0x2e1/0x360
> [ 65.740706][ T42] __pcs_replace_empty_main+0x233/0x440
> [ 65.741262][ T42] __kmalloc_cache_noprof+0x2d0/0x490
> [ 65.741791][ T42] au8522_get_state+0x266/0x4c0
> [ 65.742280][ T42] au8522_attach+0xba/0x2d0
> [ 65.742728][ T42] au0828_dvb_register+0xcc/0x15f0
> [ 65.743241][ T42] au0828_usb_probe+0x353/0x4b0
> [ 65.743723][ T42] usb_probe_interface+0x4aa/0xa40
> [ 65.744264][ T42] really_probe+0x259/0x9a0
> [ 65.744713][ T42] __driver_probe_device+0x18b/0x370
> [ 65.745246][ T42] driver_probe_device+0x4b/0x1e0
> [ 65.745745][ T42] __device_attach_driver+0x1d0/0x2f0
> [ 65.746284][ T42] page last free pid 4578 tgid 4578 stack trace:
> [ 65.746909][ T42] __free_frozen_pages+0xb8c/0xcb0
> [ 65.747427][ T42] __slab_free+0x219/0x260
> [ 65.747870][ T42] qlist_free_all+0x33/0x120
> [ 65.748339][ T42] kasan_quarantine_reduce+0x152/0x170
> [ 65.748877][ T42] __kasan_slab_alloc+0x1f/0x60
> [ 65.749368][ T42] kmem_cache_alloc_noprof+0x1f0/0x480
> [ 65.749908][ T42] do_getname+0x2a/0x1c0
> [ 65.750337][ T42] do_sys_openat2+0x99/0x190
> [ 65.750798][ T42] __x64_sys_openat+0x20b/0x260
> [ 65.751287][ T42] do_syscall_64+0x125/0x590
> [ 65.751744][ T42] entry_SYSCALL_64_after_hwframe+0x76/0x7e
> [ 65.752334][ T42]
> [ 65.752572][ T42] Memory state around the buggy address:
> [ 65.753132][ T42] ffff8881685f4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [ 65.753918][ T42] ffff8881685f4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [ 65.754712][ T42] >ffff8881685f4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [ 65.755504][ T42] ^
> [ 65.755985][ T42] ffff8881685f4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [ 65.756775][ T42] ffff8881685f4200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [ 65.757575][ T42] ==================================================================
> [ 65.758570][ T42] Kernel panic - not syncing: KASAN: panic_on_warn set ...
> [ 65.759306][ T42] CPU: 1 UID: 0 PID: 42 Comm: kworker/1:1 Not tainted 7.1.0-rc5-00006-ge8c2f9fdadee #16 PREEMPT(
> [ 65.760402][ T42] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debia4
> [ 65.761615][ T42] Workqueue: usb_hub_wq hub_event
> [ 65.762263][ T42] Call Trace:
> [ 65.762658][ T42] <TASK>
> [ 65.762956][ T42] dump_stack_lvl+0x26/0x80
> [ 65.763420][ T42] vpanic+0x37d/0x710
> [ 65.764686][ T42] panic+0x9f/0xa0
> [ 65.767120][ T42] check_panic_on_warn+0x58/0x70
> [ 65.768155][ T42] end_report+0x44/0xe0
> [ 65.769116][ T42] kasan_report+0xd4/0x100
> [ 65.770092][ T42] au0828_dvb_register+0x1280/0x15f0
> [ 65.771097][ T42] au0828_usb_probe+0x353/0x4b0
> [ 65.771586][ T42] usb_probe_interface+0x4aa/0xa40
> [ 65.772089][ T42] really_probe+0x259/0x9a0
> [ 65.772549][ T42] __driver_probe_device+0x18b/0x370
> [ 65.773069][ T42] driver_probe_device+0x4b/0x1e0
> [ 65.773576][ T42] __device_attach_driver+0x1d0/0x2f0
> [ 65.774692][ T42] bus_for_each_drv+0x22a/0x260
> [ 65.777453][ T42] __device_attach+0x25a/0x480
> [ 65.780818][ T42] device_initial_probe+0x68/0xa0
> [ 65.781322][ T42] bus_probe_device+0x10a/0x1d0
> [ 65.781800][ T42] device_add+0x56b/0x9c0
> [ 65.782284][ T42] usb_set_configuration+0x1775/0x1d80
> [ 65.782822][ T42] usb_generic_driver_probe+0x61/0xf0
> [ 65.783361][ T42] usb_probe_device+0xd3/0x2a0
> [ 65.783832][ T42] really_probe+0x259/0x9a0
> [ 65.784286][ T42] __driver_probe_device+0x18b/0x370
> [ 65.784804][ T42] driver_probe_device+0x4b/0x1e0
> [ 65.785304][ T42] __device_attach_driver+0x1d0/0x2f0
> [ 65.786416][ T42] bus_for_each_drv+0x22a/0x260
> [ 65.789198][ T42] __device_attach+0x25a/0x480
> [ 65.792606][ T42] device_initial_probe+0x68/0xa0
> [ 65.793101][ T42] bus_probe_device+0x10a/0x1d0
> [ 65.793602][ T42] device_add+0x56b/0x9c0
> [ 65.794028][ T42] usb_new_device+0xbdd/0x1830
> [ 65.795025][ T42] hub_event+0x2358/0x4090
> [ 65.797580][ T42] process_scheduled_works+0x73d/0xed0
> [ 65.798124][ T42] worker_thread+0x7d6/0xb60
> [ 65.799085][ T42] kthread+0x322/0x410
> [ 65.800465][ T42] ret_from_fork+0x285/0x750
> [ 65.802356][ T42] ret_from_fork_asm+0x1a/0x30
> [ 65.802830][ T42] </TASK>
> [ 65.803886][ T42] Kernel Offset: disabled
> [ 65.804329][ T42] ---[ end Kernel panic - not syncing: KASAN: panic_on_warn set ... ]—
>
>>>
>>> [ 141.481576][ T48] ==================================================================
>>> [ 141.482348][ T48] BUG: KASAN: slab-use-after-free in au0828_dvb_register (drivers/media/usb/au0828/au0828-dvb.c:636)
>>> [ 141.483148][ T48] Read of size 8 at addr ffff888171d4a118 by task kworker/1:1/48
>>> [ 141.483903][ T48]
>>> [ 141.484144][ T48] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.34
>>> [ 141.484148][ T48] Workqueue: usb_hub_wq hub_event
>>> [ 141.484154][ T48] Call Trace:
>>> [ 141.484157][ T48] <TASK>
>>> [ 141.484159][ T48] dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
>>> [ 141.484164][ T48] print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)
>>> [ 141.484177][ T48] kasan_report (mm/kasan/report.c:595)
>>> [ 141.484183][ T48] au0828_dvb_register (drivers/media/usb/au0828/au0828-dvb.c:636)
>>> [ 141.484190][ T48] au0828_usb_probe (drivers/media/usb/au0828/au0828-core.c:733)
>>> [ 141.484193][ T48] usb_probe_interface (drivers/usb/core/driver.c:396)
>>> [ 141.484198][ T48] really_probe (drivers/base/dd.c:? drivers/base/dd.c:709)
>>> [ 141.484204][ T48] __driver_probe_device (drivers/base/dd.c:871)
>>> [ 141.484207][ T48] driver_probe_device (drivers/base/dd.c:901)
>>> [ 141.484211][ T48] __device_attach_driver (drivers/base/dd.c:1029)
>>> [ 141.484217][ T48] bus_for_each_drv (drivers/base/bus.c:500)
>>> [ 141.484264][ T48] __device_attach (drivers/base/dd.c:1101)
>>> [ 141.484289][ T48] device_initial_probe (drivers/base/dd.c:1156)
>>> [ 141.484292][ T48] bus_probe_device (drivers/base/bus.c:613)
>>> [ 141.484296][ T48] device_add (drivers/base/core.c:3706)
>>> [ 141.484299][ T48] usb_set_configuration (drivers/usb/core/message.c:2268)
>>> [ 141.484303][ T48] usb_generic_driver_probe (drivers/usb/core/generic.c:250)
>>> [ 141.484308][ T48] usb_probe_device (drivers/usb/core/driver.c:291)
>>> [ 141.484311][ T48] really_probe (drivers/base/dd.c:? drivers/base/dd.c:709)
>>> [ 141.484315][ T48] __driver_probe_device (drivers/base/dd.c:871)
>>> [ 141.484318][ T48] driver_probe_device (drivers/base/dd.c:901)
>>> [ 141.484321][ T48] __device_attach_driver (drivers/base/dd.c:1029)
>>> [ 141.484328][ T48] bus_for_each_drv (drivers/base/bus.c:500)
>>> [ 141.484346][ T48] __device_attach (drivers/base/dd.c:1101)
>>> [ 141.484367][ T48] device_initial_probe (drivers/base/dd.c:1156)
>>> [ 141.484370][ T48] bus_probe_device (drivers/base/bus.c:613)
>>> [ 141.484374][ T48] device_add (drivers/base/core.c:3706)
>>> [ 141.484376][ T48] usb_new_device (drivers/usb/core/hub.c:2695)
>>> [ 141.484386][ T48] hub_event (drivers/usb/core/hub.c:5567 drivers/usb/core/hub.c:5707 drivers/usb/core/hub.c:5871 drivers/usb/core/hub.c:5953)
>>> [ 141.484406][ T48] process_scheduled_works (kernel/workqueue.c:3314 kernel/workqueue.c:3397)
>>> [ 141.484412][ T48] worker_thread (kernel/workqueue.c:3478)
>>> [ 141.484420][ T48] kthread (kernel/kthread.c:436)
>>> [ 141.484431][ T48] ret_from_fork (arch/x86/kernel/process.c:158)
>>> [ 141.484445][ T48] ret_from_fork_asm (arch/x86/entry/entry_64.S:245)
>>> [ 141.484450][ T48] </TASK>
>>> [ 141.484451][ T48]
>>> [ 141.523531][ T48] Freed by task 48 on cpu 1 at 141.481575s:
>>> [ 141.524120][ T48] kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78)
>>> [ 141.524594][ T48] kasan_save_free_info (mm/kasan/generic.c:584)
>>> [ 141.525089][ T48] __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285)
>>> [ 141.525570][ T48] kfree (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6566)
>>> [ 141.525957][ T48] au8522_release_state (drivers/media/dvb-frontends/au8522_common.c:124)
>>> [ 141.526467][ T48] dvb_frontend_put (drivers/media/dvb-core/dvb_frontend.c:3093 drivers/media/dvb-core/dvb_frontend.c:141 drivers/media/dvb-core/dvb_frontend.c:166)
>>> [ 141.526957][ T48] au0828_dvb_register (drivers/media/usb/au0828/au0828-dvb.c:518 drivers/media/usb/au0828/au0828-dvb.c:634)
>>> [ 141.527469][ T48] au0828_usb_probe (drivers/media/usb/au0828/au0828-core.c:733)
>>> [ 141.527952][ T48] usb_probe_interface (drivers/usb/core/driver.c:396)
>>> [ 141.528455][ T48] really_probe (drivers/base/dd.c:? drivers/base/dd.c:709)
>>> [ 141.528908][ T48] __driver_probe_device (drivers/base/dd.c:871)
>>> [ 141.529426][ T48] driver_probe_device (drivers/base/dd.c:901)
>>> [ 141.529932][ T48] __device_attach_driver (drivers/base/dd.c:1029)
>>> [ 141.530459][ T48] bus_for_each_drv (drivers/base/bus.c:500)
>>> [ 141.530949][ T48] __device_attach (drivers/base/dd.c:1101)
>>> [ 141.531419][ T48] device_initial_probe (drivers/base/dd.c:1156)
>>> [ 141.531923][ T48] bus_probe_device (drivers/base/bus.c:613)
>>> [ 141.532404][ T48] device_add (drivers/base/core.c:3706)
>>> [ 141.532840][ T48] usb_set_configuration (drivers/usb/core/message.c:2268)
>>> [ 141.533373][ T48] usb_generic_driver_probe (drivers/usb/core/generic.c:250)
>>> [ 141.533907][ T48] usb_probe_device (drivers/usb/core/driver.c:291)
>>> [ 141.534377][ T48] really_probe (drivers/base/dd.c:? drivers/base/dd.c:709)
>>> [ 141.534833][ T48] __driver_probe_device (drivers/base/dd.c:871)
>>> [ 141.535352][ T48] driver_probe_device (drivers/base/dd.c:901)
>>> [ 141.535856][ T48] __device_attach_driver (drivers/base/dd.c:1029)
>>> [ 141.536384][ T48] bus_for_each_drv (drivers/base/bus.c:500)
>>> [ 141.536869][ T48] __device_attach (drivers/base/dd.c:1101)
>>> [ 141.537340][ T48] device_initial_probe (drivers/base/dd.c:1156)
>>> [ 141.537839][ T48] bus_probe_device (drivers/base/bus.c:613)
>>> [ 141.538320][ T48] device_add (drivers/base/core.c:3706)
>>> [ 141.538753][ T48] usb_new_device (drivers/usb/core/hub.c:2695)
>>> [ 141.539226][ T48] hub_event (drivers/usb/core/hub.c:5567 drivers/usb/core/hub.c:5707 drivers/usb/core/hub.c:5871 drivers/usb/core/hub.c:5953)
>>> [ 141.539672][ T48] process_scheduled_works (kernel/workqueue.c:3314 kernel/workqueue.c:3397)
>>> [ 141.540205][ T48] worker_thread (kernel/workqueue.c:3478)
>>> [ 141.540666][ T48] kthread (kernel/kthread.c:436)
>>> [ 141.541069][ T48] ret_from_fork (arch/x86/kernel/process.c:158)
>>> [ 141.541524][ T48] ret_from_fork_asm (arch/x86/entry/entry_64.S:245)
>>> [ 141.541999][ T48]
>>> [ 141.542236][ T48] The buggy address belongs to the object at ffff888171d4a000
>>> [ 141.542236][ T48] which belongs to the cache kmalloc-4k of size 4096
>>> [ 141.543602][ T48] The buggy address is located 280 bytes inside of
>>> [ 141.543602][ T48] freed 4096-byte region [ffff888171d4a000, ffff888171d4b000)