Hello, syzbot found the following crash on: HEAD commit: e17994d1 usb: core: kcov: collect coverage from usb comple.. git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=113938c5e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=5d64370c438bc60 dashboard link: https://syzkaller.appspot.com/bug?extid=666280b21749af5d36db compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13fdc1e5e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1507178de00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+666280b21749af5d36db@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: use-after-free in __wake_up_common+0x634/0x650 kernel/sched/wait.c:86 Read of size 8 at addr ffff8881cec10000 by task swapper/1/0 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xef/0x16e lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374 __kasan_report.cold+0x37/0x77 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:641 __wake_up_common+0x634/0x650 kernel/sched/wait.c:86 complete+0x51/0x70 kernel/sched/completion.c:36 htc_process_conn_rsp drivers/net/wireless/ath/ath9k/htc_hst.c:138 [inline] ath9k_htc_rx_msg+0x7c2/0xaf0 drivers/net/wireless/ath/ath9k/htc_hst.c:443 ath9k_hif_usb_reg_in_cb+0x1ba/0x630 drivers/net/wireless/ath/ath9k/hif_usb.c:718 __usb_hcd_giveback_urb+0x29a/0x550 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1716 dummy_timer+0x1258/0x32ae drivers/usb/gadget/udc/dummy_hcd.c:1966 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
