Hello, syzbot found the following issue on: HEAD commit: 449dc8c9 Merge tag 'for-v5.9' of git://git.kernel.org/pub/.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=16663509900000 kernel config: https://syzkaller.appspot.com/x/.config?x=6ef84fa8ee48e528 dashboard link: https://syzkaller.appspot.com/bug?extid=4e886425af54bc69daea compiler: gcc (GCC) 10.1.0-syz 20200507 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4e886425af54bc69daea@xxxxxxxxxxxxxxxxxxxxxxxxx usb 1-1: USB disconnect, device number 97 list_del corruption. next->prev should be ffff8881c93dc010, but was ffff8883c93dc012 ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:54! invalid opcode: 0000 [#1] SMP KASAN CPU: 1 PID: 3074 Comm: kworker/1:3 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:__list_del_entry_valid.cold+0x48/0x55 lib/list_debug.c:54 Code: e8 f1 71 3c ff 0f 0b 4c 89 e2 48 89 ee 48 c7 c7 20 85 1c 86 e8 dd 71 3c ff 0f 0b 48 89 ee 48 c7 c7 e0 85 1c 86 e8 cc 71 3c ff <0f> 0b cc cc cc cc cc cc cc cc cc cc cc 41 57 41 56 41 55 41 54 55 RSP: 0018:ffff8881d50b7498 EFLAGS: 00010286 RAX: 0000000000000054 RBX: ffff8881c93dc000 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff8129ec93 RDI: ffffed103aa16e85 RBP: ffff8881c93dc010 R08: 0000000000000054 R09: ffff8881db32f54f R10: 0000000000000000 R11: 000000000007e3b8 R12: ffff8881cdd8d108 R13: ffff8881c93dc090 R14: ffff8881c93dc000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3cf3d4a380 CR3: 00000001ab4d2000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:132 [inline] list_del include/linux/list.h:146 [inline] media_gobj_destroy drivers/media/mc/mc-entity.c:187 [inline] media_gobj_destroy+0xa1/0x232 drivers/media/mc/mc-entity.c:176 __media_device_unregister_entity+0x236/0x300 drivers/media/mc/mc-device.c:603 media_device_unregister_entity+0x49/0x70 drivers/media/mc/mc-device.c:688 dvb_media_device_free+0x1d5/0x620 drivers/media/dvb-core/dvbdev.c:226 dvb_remove_device.part.0+0x8f/0x240 drivers/media/dvb-core/dvbdev.c:561 dvb_remove_device drivers/media/dvb-core/dvbdev.c:554 [inline] dvb_unregister_device+0x1b/0x60 drivers/media/dvb-core/dvbdev.c:583 dvb_dmxdev_release+0x1a0/0x640 drivers/media/dvb-core/dmxdev.c:1459 dvb_usb_adapter_dvb_exit+0xa9/0x240 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:224 dvb_usb_adapter_exit drivers/media/usb/dvb-usb/dvb-usb-init.c:114 [inline] dvb_usb_exit.isra.0+0xaa/0x2a0 drivers/media/usb/dvb-usb/dvb-usb-init.c:129 dvb_usb_device_exit+0x111/0x1a0 drivers/media/usb/dvb-usb/dvb-usb-init.c:306 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:436 __device_release_driver+0x3c6/0x6f0 drivers/base/dd.c:1153 device_release_driver_internal drivers/base/dd.c:1184 [inline] device_release_driver+0x26/0x40 drivers/base/dd.c:1207 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533 device_del+0x481/0xd90 drivers/base/core.c:3107 usb_disable_device+0x387/0x930 drivers/usb/core/message.c:1245 usb_disconnect.cold+0x27d/0x780 drivers/usb/core/hub.c:2217 hub_port_connect drivers/usb/core/hub.c:5059 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x1c93/0x4390 drivers/usb/core/hub.c:5576 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x392/0x470 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Modules linked in: ---[ end trace 409eb60372a6c4c3 ]--- RIP: 0010:__list_del_entry_valid.cold+0x48/0x55 lib/list_debug.c:54 Code: e8 f1 71 3c ff 0f 0b 4c 89 e2 48 89 ee 48 c7 c7 20 85 1c 86 e8 dd 71 3c ff 0f 0b 48 89 ee 48 c7 c7 e0 85 1c 86 e8 cc 71 3c ff <0f> 0b cc cc cc cc cc cc cc cc cc cc cc 41 57 41 56 41 55 41 54 55 RSP: 0018:ffff8881d50b7498 EFLAGS: 00010286 RAX: 0000000000000054 RBX: ffff8881c93dc000 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff8129ec93 RDI: ffffed103aa16e85 RBP: ffff8881c93dc010 R08: 0000000000000054 R09: ffff8881db32f54f R10: 0000000000000000 R11: 000000000007e3b8 R12: ffff8881cdd8d108 R13: ffff8881c93dc090 R14: ffff8881c93dc000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3cf3d4a380 CR3: 00000001ab4d2000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. 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