On Tue, Sep 3, 2019 at 2:08 PM syzbot <syzbot+90b997df76897a013829@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: eea39f24 usb-fuzzer: main usb gadget fuzzer driver > git tree: https://github.com/google/kasan.git usb-fuzzer > console output: https://syzkaller.appspot.com/x/log.txt?x=140a786c600000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d0c62209eedfd54e > dashboard link: https://syzkaller.appspot.com/bug?extid=90b997df76897a013829 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+90b997df76897a013829@xxxxxxxxxxxxxxxxxxxxxxxxx > > ================================================================== > BUG: KASAN: use-after-free in __lock_acquire+0x302a/0x3b50 > kernel/locking/lockdep.c:3753 > Read of size 8 at addr ffff8881d34368a0 by task syz-executor.3/10760 > > CPU: 0 PID: 10760 Comm: syz-executor.3 Not tainted 5.3.0-rc5+ #28 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0xca/0x13e lib/dump_stack.c:113 > print_address_description+0x6a/0x32c mm/kasan/report.c:351 > __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482 > kasan_report+0xe/0x12 mm/kasan/common.c:612 > __lock_acquire+0x302a/0x3b50 kernel/locking/lockdep.c:3753 > lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4412 > __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] > _raw_spin_lock_irq+0x2d/0x40 kernel/locking/spinlock.c:167 > spin_lock_irq include/linux/spinlock.h:363 [inline] > usbhid_close+0x51/0x210 drivers/hid/usbhid/hid-core.c:740 > hid_hw_close+0xa8/0xd0 drivers/hid/hid-core.c:2046 > drop_ref.part.0+0x32/0xe0 drivers/hid/hidraw.c:337 > drop_ref drivers/hid/hidraw.c:360 [inline] > hidraw_release+0x34f/0x440 drivers/hid/hidraw.c:356 > __fput+0x2d7/0x840 fs/file_table.c:280 > task_work_run+0x13f/0x1c0 kernel/task_work.c:113 > tracehook_notify_resume include/linux/tracehook.h:188 [inline] > exit_to_usermode_loop+0x1d2/0x200 arch/x86/entry/common.c:163 > prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] > syscall_return_slowpath arch/x86/entry/common.c:274 [inline] > do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:299 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x413561 > Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 > 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 > 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 > RSP: 002b:00007ffc873b3300 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 > RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413561 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 > RBP: 0000000000000001 R08: 0000000055395a94 R09: 0000000055395a98 > R10: 00007ffc873b33e0 R11: 0000000000000293 R12: 000000000075bfc8 > R13: 0000000000096f96 R14: 0000000000762460 R15: ffffffffffffffff > > The buggy address belongs to the page: > page:ffffea00074d0d80 refcount:0 mapcount:0 mapping:0000000000000000 > index:0x0 > flags: 0x200000000000000() > raw: 0200000000000000 0000000000000000 dead000000000122 0000000000000000 > raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8881d3436780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ffff8881d3436800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > > ffff8881d3436880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ^ > ffff8881d3436900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ffff8881d3436980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ================================================================== > > > --- > 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. #syz dup: general protection fault in __pm_runtime_resume
