Hello, I ran a 4.9.7 kernel with CONFIG_KASAN=y on my machine and it detected the following problem: [ 23.012238] rtl8192cu: MAC auto ON okay! [ 23.045656] rtl8192cu: Tx queue select: 0x05 [ 23.541152] ================================================================== [ 23.541160] BUG: KASAN: slab-out-of-bounds in rtl92c_dm_bt_coexist+0x858/0x1e40 [rtl8192c_common] at addr ffff8801c90edb08 [ 23.541161] Read of size 1 by task kworker/0:1/38 [ 23.541163] page:ffffea0007243800 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 [ 23.543194] flags: 0x8000000000004000(head) [ 23.545178] page dumped because: kasan: bad access detected [ 23.545181] CPU: 0 PID: 38 Comm: kworker/0:1 Not tainted 4.9.7-gentoo #3 [ 23.545182] Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./Z77-DS3H, BIOS F11a 11/13/2013 [ 23.545186] Workqueue: rtl92c_usb rtl_watchdog_wq_callback [rtlwifi] [ 23.545187] 0000000000000000 ffffffff829eea33 ffff8801d7f0fa30 ffff8801c90edb08 [ 23.545189] ffffffff824c0f09 ffff8801d4abee80 0000000000000004 0000000000000297 [ 23.545191] ffffffffc070b57c ffff8801c7aa7c48 ffff880100000004 ffffffff000003e8 [ 23.545192] Call Trace: [ 23.545197] [<ffffffff829eea33>] ? dump_stack+0x5c/0x79 [ 23.545200] [<ffffffff824c0f09>] ? kasan_report_error+0x4b9/0x4e0 [ 23.545202] [<ffffffffc070b57c>] ? _usb_read_sync+0x15c/0x280 [rtl_usb] [ 23.545204] [<ffffffff824c0f75>] ? __asan_report_load1_noabort+0x45/0x50 [ 23.545206] [<ffffffffc06d7a88>] ? rtl92c_dm_bt_coexist+0x858/0x1e40 [rtl8192c_common] [ 23.545208] [<ffffffffc06d7a88>] ? rtl92c_dm_bt_coexist+0x858/0x1e40 [rtl8192c_common] [ 23.545210] [<ffffffffc06d0cbe>] ? rtl92c_dm_rf_saving+0x96e/0x1330 [rtl8192c_common] [ 23.545212] [<ffffffffc06dab80>] ? rtl92c_dm_watchdog+0x1130/0x4590 [rtl8192c_common] [ 23.545214] [<ffffffffc06d9a50>] ? rtl92c_dm_dynamic_txpower+0x9e0/0x9e0 [rtl8192c_common] [ 23.545216] [<ffffffff8222038d>] ? pick_next_entity+0x18d/0x400 [ 23.545218] [<ffffffff8223fdde>] ? pick_next_task_fair+0xa6e/0xf60 [ 23.545220] [<ffffffff8207548a>] ? __switch_to+0x7ba/0x1160 [ 23.545223] [<ffffffffc0689a2b>] ? rtl_watchdog_wq_callback+0xb7b/0x1190 [rtlwifi] [ 23.545225] [<ffffffffc0688eb0>] ? rtl_tx_mgmt_proc+0x2c0/0x2c0 [rtlwifi] [ 23.545228] [<ffffffff82d1ecfe>] ? drm_fb_helper_dirty_work+0x25e/0x2f0 [ 23.545230] [<ffffffff83c65d20>] ? io_schedule_timeout+0x390/0x390 [ 23.545233] [<ffffffff82b8cef0>] ? update_attr.isra.2+0x170/0x170 [ 23.545234] [<ffffffff82b80a01>] ? fb_flashcursor+0x331/0x3e0 [ 23.545237] [<ffffffff821d7af9>] ? process_one_work+0x539/0x12b0 [ 23.545239] [<ffffffff821d894f>] ? worker_thread+0xdf/0x13e0 [ 23.545240] [<ffffffff8225343c>] ? __wake_up_common+0xbc/0x160 [ 23.545242] [<ffffffff821d8870>] ? process_one_work+0x12b0/0x12b0 [ 23.545244] [<ffffffff821e7f89>] ? kthread+0x1b9/0x210 [ 23.545245] [<ffffffff821e7dd0>] ? kthread_park+0x80/0x80 [ 23.545247] [<ffffffff821e7dd0>] ? kthread_park+0x80/0x80 [ 23.545248] [<ffffffff821e7dd0>] ? kthread_park+0x80/0x80 [ 23.545250] [<ffffffff83c724c5>] ? ret_from_fork+0x25/0x30 [ 23.545251] Memory state around the buggy address: [ 23.545253] ffff8801c90eda00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe [ 23.545254] ffff8801c90eda80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe [ 23.545255] >ffff8801c90edb00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe [ 23.545256] ^ [ 23.545257] ffff8801c90edb80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe [ 23.545257] ffff8801c90edc00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe [ 23.545258] ================================================================== [ 23.545258] Disabling lock debugging due to kernel taint [ 23.545300] ================================================================== [ 23.545303] BUG: KASAN: slab-out-of-bounds in rtl92c_dm_watchdog+0x3dfb/0x4590 [rtl8192c_common] at addr ffff8801c90edb1c [ 23.545304] Read of size 4 by task kworker/0:1/38 [ 23.545305] page:ffffea0007243800 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 [ 23.547353] flags: 0x8000000000004000(head) [ 23.547354] page dumped because: kasan: bad access detected [ 23.547355] CPU: 0 PID: 38 Comm: kworker/0:1 Tainted: G B 4.9.7-gentoo #3 [ 23.547356] Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./Z77-DS3H, BIOS F11a 11/13/2013 [ 23.547358] Workqueue: rtl92c_usb rtl_watchdog_wq_callback [rtlwifi] [ 23.547360] 0000000000000000 ffffffff829eea33 ffff8801d7f0fa80 ffff8801c90edb1c [ 23.547361] ffffffff824c0f09 ffff8801c90e0748 ffff8801c90e1420 0000000000000297 [ 23.547363] ffff8801c90e1420 ffffffff824c0f75 ffff8801c90edb08 ffff8801c90edb08 [ 23.547363] Call Trace: [ 23.547367] [<ffffffff829eea33>] ? dump_stack+0x5c/0x79 [ 23.547368] [<ffffffff824c0f09>] ? kasan_report_error+0x4b9/0x4e0 [ 23.547370] [<ffffffff824c0f75>] ? __asan_report_load1_noabort+0x45/0x50 [ 23.547371] [<ffffffff824c1015>] ? __asan_report_load4_noabort+0x45/0x50 [ 23.547373] [<ffffffffc06dd84b>] ? rtl92c_dm_watchdog+0x3dfb/0x4590 [rtl8192c_common] [ 23.547375] [<ffffffffc06dd84b>] ? rtl92c_dm_watchdog+0x3dfb/0x4590 [rtl8192c_common] [ 23.547377] [<ffffffffc06d9a50>] ? rtl92c_dm_dynamic_txpower+0x9e0/0x9e0 [rtl8192c_common] [ 23.547378] [<ffffffff8222038d>] ? pick_next_entity+0x18d/0x400 [ 23.547380] [<ffffffff8223fdde>] ? pick_next_task_fair+0xa6e/0xf60 [ 23.547381] [<ffffffff8207548a>] ? __switch_to+0x7ba/0x1160 [ 23.547383] [<ffffffffc0689a2b>] ? rtl_watchdog_wq_callback+0xb7b/0x1190 [rtlwifi] [ 23.547385] [<ffffffffc0688eb0>] ? rtl_tx_mgmt_proc+0x2c0/0x2c0 [rtlwifi] [ 23.547387] [<ffffffff82d1ecfe>] ? drm_fb_helper_dirty_work+0x25e/0x2f0 [ 23.547388] [<ffffffff83c65d20>] ? io_schedule_timeout+0x390/0x390 [ 23.547390] [<ffffffff82b8cef0>] ? update_attr.isra.2+0x170/0x170 [ 23.547391] [<ffffffff82b80a01>] ? fb_flashcursor+0x331/0x3e0 [ 23.547393] [<ffffffff821d7af9>] ? process_one_work+0x539/0x12b0 [ 23.547394] [<ffffffff821d894f>] ? worker_thread+0xdf/0x13e0 [ 23.547396] [<ffffffff8225343c>] ? __wake_up_common+0xbc/0x160 [ 23.547398] [<ffffffff821d8870>] ? process_one_work+0x12b0/0x12b0 [ 23.547399] [<ffffffff821e7f89>] ? kthread+0x1b9/0x210 [ 23.547400] [<ffffffff821e7dd0>] ? kthread_park+0x80/0x80 [ 23.547401] [<ffffffff821e7dd0>] ? kthread_park+0x80/0x80 [ 23.547403] [<ffffffff821e7dd0>] ? kthread_park+0x80/0x80 [ 23.547404] [<ffffffff83c724c5>] ? ret_from_fork+0x25/0x30 [ 23.547405] Memory state around the buggy address: [ 23.547406] ffff8801c90eda00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe [ 23.547407] ffff8801c90eda80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe [ 23.547407] >ffff8801c90edb00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe [ 23.547408] ^ [ 23.547409] ffff8801c90edb80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe [ 23.547410] ffff8801c90edc00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe [ 23.547410] ================================================================== -- Dmitry
