Warning: Permanently added '10.128.0.188' (ED25519) to the list of known hosts. [ 35.199442][ T6442] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1 [ 35.202143][ T6442] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9 [ 35.204584][ T6442] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9 [ 35.207454][ T6442] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4 [ 35.209757][ T6442] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3 [ 35.212209][ T6442] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2 executing program [ 35.520602][ T28] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 35.670516][ T28] usb 1-1: Using ep0 maxpacket: 8 [ 35.674449][ T28] usb 1-1: unable to get BOS descriptor or descriptor too short [ 35.677974][ T28] usb 1-1: config 0 has an invalid interface number: 199 but max is 3 [ 35.680231][ T28] usb 1-1: config 0 has an invalid interface number: 54 but max is 3 [ 35.682445][ T28] usb 1-1: config 0 has an invalid interface number: 108 but max is 3 [ 35.684536][ T28] usb 1-1: config 0 has no interface number 1 [ 35.686169][ T28] usb 1-1: config 0 has no interface number 2 [ 35.687763][ T28] usb 1-1: config 0 has no interface number 3 [ 35.689363][ T28] usb 1-1: config 0 interface 199 has no altsetting 0 [ 35.691249][ T28] usb 1-1: config 0 interface 0 has no altsetting 0 [ 35.692935][ T28] usb 1-1: config 0 interface 54 has no altsetting 0 [ 35.694708][ T28] usb 1-1: config 0 interface 108 has no altsetting 0 [ 35.698510][ T28] usb 1-1: New USB device found, idVendor=0424, idProduct=c001, bcdDevice=1c.8f [ 35.701194][ T28] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 35.703264][ T28] usb 1-1: Product: syz [ 35.704393][ T28] usb 1-1: Manufacturer: syz [ 35.705561][ T28] usb 1-1: SerialNumber: syz [ 35.709971][ T28] usb 1-1: config 0 descriptor?? [ 35.942275][ T28] usb 1-1: USB disconnect, device number 2 [ 35.946659][ T28] ================================================================== [ 35.949094][ T28] BUG: KASAN: slab-use-after-free in hdm_disconnect+0xf8/0x190 [ 35.951042][ T28] Read of size 8 at addr ffff0000dc3558a8 by task kworker/1:1/28 [ 35.953102][ T28] [ 35.953729][ T28] CPU: 1 UID: 0 PID: 28 Comm: kworker/1:1 Not tainted 6.14.0-rc7-syzkaller-ga2392f333575 #0 [ 35.953744][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 35.953752][ T28] Workqueue: usb_hub_wq hub_event [ 35.953775][ T28] Call trace: [ 35.953779][ T28] show_stack+0x2c/0x3c (C) [ 35.953796][ T28] dump_stack_lvl+0xe4/0x150 [ 35.953811][ T28] print_report+0x198/0x550 [ 35.953828][ T28] kasan_report+0xd8/0x138 [ 35.953840][ T28] __asan_report_load8_noabort+0x20/0x2c [ 35.953853][ T28] hdm_disconnect+0xf8/0x190 [ 35.953866][ T28] usb_unbind_interface+0x22c/0x7ec [ 35.953880][ T28] device_release_driver_internal+0x440/0x698 [ 35.953894][ T28] device_release_driver+0x28/0x38 [ 35.953906][ T28] bus_remove_device+0x314/0x3b4 [ 35.953918][ T28] device_del+0x480/0x828 [ 35.953932][ T28] usb_disable_device+0x354/0x760 [ 35.953945][ T28] usb_disconnect+0x290/0x808 [ 35.953956][ T28] hub_event+0x1918/0x4280 [ 35.953967][ T28] process_one_work+0x810/0x1638 [ 35.953979][ T28] worker_thread+0x9b4/0xeec [ 35.953991][ T28] kthread+0x65c/0x7b0 [ 35.954002][ T28] ret_from_fork+0x10/0x20 [ 35.954013][ T28] [ 35.985164][ T28] Allocated by task 28: [ 35.986301][ T28] kasan_save_track+0x40/0x78 [ 35.987553][ T28] kasan_save_alloc_info+0x40/0x50 [ 35.988961][ T28] __kasan_kmalloc+0xac/0xc4 [ 35.990167][ T28] __kmalloc_cache_noprof+0x2cc/0x428 [ 35.991624][ T28] hdm_probe+0xa4/0x1044 [ 35.992771][ T28] usb_probe_interface+0x598/0xa40 [ 35.994149][ T28] really_probe+0x38c/0x8fc [ 35.995370][ T28] __driver_probe_device+0x194/0x374 [ 35.996792][ T28] driver_probe_device+0x78/0x330 [ 35.998131][ T28] __device_attach_driver+0x2a8/0x4f4 [ 35.999543][ T28] bus_for_each_drv+0x228/0x2bc [ 36.000835][ T28] __device_attach+0x2b4/0x434 [ 36.002121][ T28] device_initial_probe+0x24/0x34 [ 36.003497][ T28] bus_probe_device+0x178/0x240 [ 36.004810][ T28] device_add+0x728/0xa6c [ 36.006003][ T28] usb_set_configuration+0x15cc/0x1b38 [ 36.007526][ T28] usb_generic_driver_probe+0x8c/0x148 [ 36.009006][ T28] usb_probe_device+0x1a4/0x348 [ 36.010287][ T28] really_probe+0x38c/0x8fc [ 36.011463][ T28] __driver_probe_device+0x194/0x374 [ 36.012846][ T28] driver_probe_device+0x78/0x330 [ 36.014230][ T28] __device_attach_driver+0x2a8/0x4f4 [ 36.015699][ T28] bus_for_each_drv+0x228/0x2bc [ 36.017048][ T28] __device_attach+0x2b4/0x434 [ 36.018329][ T28] device_initial_probe+0x24/0x34 [ 36.019671][ T28] bus_probe_device+0x178/0x240 [ 36.020937][ T28] device_add+0x728/0xa6c [ 36.022062][ T28] usb_new_device+0x908/0x14ac [ 36.023391][ T28] hub_event+0x2454/0x4280 [ 36.024561][ T28] process_one_work+0x810/0x1638 [ 36.025871][ T28] worker_thread+0x97c/0xeec [ 36.027078][ T28] kthread+0x65c/0x7b0 [ 36.028180][ T28] ret_from_fork+0x10/0x20 [ 36.029385][ T28] [ 36.029998][ T28] Freed by task 28: [ 36.030997][ T28] kasan_save_track+0x40/0x78 [ 36.032243][ T28] kasan_save_free_info+0x54/0x6c [ 36.033568][ T28] __kasan_slab_free+0x64/0x8c [ 36.034874][ T28] kfree+0x180/0x478 [ 36.035942][ T28] release_mdev+0x20/0x30 [ 36.037097][ T28] device_release+0x8c/0x1ac [ 36.038379][ T28] kobject_put+0x2a8/0x41c [ 36.039576][ T28] device_unregister+0x3c/0xcc [ 36.040857][ T28] most_deregister_interface+0x3e0/0x42c [ 36.042351][ T28] hdm_disconnect+0xe0/0x190 [ 36.043624][ T28] usb_unbind_interface+0x22c/0x7ec [ 36.045050][ T28] device_release_driver_internal+0x440/0x698 [ 36.046672][ T28] device_release_driver+0x28/0x38 [ 36.048124][ T28] bus_remove_device+0x314/0x3b4 [ 36.049468][ T28] device_del+0x480/0x828 [ 36.050659][ T28] usb_disable_device+0x354/0x760 [ 36.052008][ T28] usb_disconnect+0x290/0x808 [ 36.053288][ T28] hub_event+0x1918/0x4280 [ 36.054458][ T28] process_one_work+0x810/0x1638 [ 36.055783][ T28] worker_thread+0x9b4/0xeec [ 36.057076][ T28] kthread+0x65c/0x7b0 [ 36.058142][ T28] ret_from_fork+0x10/0x20 [ 36.059312][ T28] [ 36.059951][ T28] The buggy address belongs to the object at ffff0000dc354000 [ 36.059951][ T28] which belongs to the cache kmalloc-8k of size 8192 [ 36.063659][ T28] The buggy address is located 6312 bytes inside of [ 36.063659][ T28] freed 8192-byte region [ffff0000dc354000, ffff0000dc356000) [ 36.067392][ T28] [ 36.068006][ T28] The buggy address belongs to the physical page: [ 36.069683][ T28] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11c350 [ 36.072122][ T28] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 36.074452][ T28] flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) [ 36.076523][ T28] page_type: f5(slab) [ 36.077574][ T28] raw: 05ffc00000000040 ffff0000c0002280 dead000000000122 0000000000000000 [ 36.079836][ T28] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 36.082186][ T28] head: 05ffc00000000040 ffff0000c0002280 dead000000000122 0000000000000000 [ 36.084551][ T28] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 36.086857][ T28] head: 05ffc00000000003 fffffdffc370d401 ffffffffffffffff 0000000000000000 [ 36.089206][ T28] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 36.091450][ T28] page dumped because: kasan: bad access detected [ 36.093136][ T28] [ 36.093726][ T28] Memory state around the buggy address: [ 36.095184][ T28] ffff0000dc355780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.097372][ T28] ffff0000dc355800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.099495][ T28] >ffff0000dc355880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.101736][ T28] ^ [ 36.103135][ T28] ffff0000dc355900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.105382][ T28] ffff0000dc355980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.107627][ T28] ================================================================== [ 36.109939][ T28] Disabling lock debugging due to kernel taint [ 36.111854][ T28] ------------[ cut here ]------------ [ 36.113299][ T28] refcount_t: underflow; use-after-free. [ 36.115104][ T28] WARNING: CPU: 1 PID: 28 at lib/refcount.c:28 refcount_warn_saturate+0x1c8/0x20c [ 36.117643][ T28] Modules linked in: [ 36.118628][ T28] CPU: 1 UID: 0 PID: 28 Comm: kworker/1:1 Tainted: G B 6.14.0-rc7-syzkaller-ga2392f333575 #0 [ 36.121526][ T28] Tainted: [B]=BAD_PAGE [ 36.122617][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 36.125268][ T28] Workqueue: usb_hub_wq hub_event [ 36.126564][ T28] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 36.128600][ T28] pc : refcount_warn_saturate+0x1c8/0x20c [ 36.130048][ T28] lr : refcount_warn_saturate+0x1c8/0x20c [ 36.131537][ T28] sp : ffff800097e57200 [ 36.132594][ T28] x29: ffff800097e57200 x28: 0000000000000000 x27: ffff0000d91b9000 [ 36.134710][ T28] x26: 1fffe0001b86a807 x25: dfff800000000000 x24: ffff8000927afb10 [ 36.136852][ T28] x23: 1fffe0001b86a8a1 x22: ffff0000dc35403c x21: 0000000000000003 [ 36.139014][ T28] x20: ffff0000dc354038 x19: ffff800092f0b000 x18: 0000000000000008 [ 36.141064][ T28] x17: 0000000000000000 x16: ffff80008b7285ac x15: ffff700011f87b50 [ 36.143145][ T28] x14: 1ffff00011f87b50 x13: 0000000000000004 x12: ffffffffffffffff [ 36.145297][ T28] x11: 0000000000000002 x10: 0000000000ff0100 x9 : 31ef428a8b9ab100 [ 36.147471][ T28] x8 : 31ef428a8b9ab100 x7 : 0000000000000001 x6 : 0000000000000001 [ 36.149574][ T28] x5 : ffff800097e569b8 x4 : ffff80008fcafb00 x3 : ffff8000804a79e8 [ 36.151640][ T28] x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000000 [ 36.153740][ T28] Call trace: [ 36.154626][ T28] refcount_warn_saturate+0x1c8/0x20c (P) [ 36.156094][ T28] kobject_put+0x1a0/0x41c [ 36.157277][ T28] put_device+0x28/0x40 [ 36.158320][ T28] hdm_disconnect+0x178/0x190 [ 36.159573][ T28] usb_unbind_interface+0x22c/0x7ec [ 36.160932][ T28] device_release_driver_internal+0x440/0x698 [ 36.162508][ T28] device_release_driver+0x28/0x38 [ 36.163852][ T28] bus_remove_device+0x314/0x3b4 [ 36.165173][ T28] device_del+0x480/0x828 [ 36.166267][ T28] usb_disable_device+0x354/0x760 [ 36.167609][ T28] usb_disconnect+0x290/0x808 [ 36.168847][ T28] hub_event+0x1918/0x4280 [ 36.170031][ T28] process_one_work+0x810/0x1638 [ 36.171314][ T28] worker_thread+0x9b4/0xeec [ 36.172528][ T28] kthread+0x65c/0x7b0 [ 36.173580][ T28] ret_from_fork+0x10/0x20 [ 36.174705][ T28] irq event stamp: 40221 [ 36.175845][ T28] hardirqs last enabled at (40221): [] finish_lock_switch+0xbc/0x1e4 [ 36.178383][ T28] hardirqs last disabled at (40220): [] __schedule+0x2bc/0x257c [ 36.181024][ T28] softirqs last enabled at (35894): [] handle_softirqs+0xb44/0xd34 [ 36.183597][ T28] softirqs last disabled at (35877): [] __do_softirq+0x14/0x20 [ 36.186000][ T28] ---[ end trace 0000000000000000 ]---