On Tue, Sep 3, 2019 at 2:08 PM syzbot <syzbot+5bb7a3b6f59db285e759@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=101b49ea600000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d0c62209eedfd54e > dashboard link: https://syzkaller.appspot.com/bug?extid=5bb7a3b6f59db285e759 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=159cd5ea600000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16717666600000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+5bb7a3b6f59db285e759@xxxxxxxxxxxxxxxxxxxxxxxxx > > appledisplay 1-1:0.16: Error while getting initial brightness: -110 > ------------[ cut here ]------------ > ODEBUG: free active (active state 0) object type: timer_list hint: > delayed_work_timer_fn+0x0/0x90 include/linux/topology.h:80 > WARNING: CPU: 0 PID: 12 at lib/debugobjects.c:481 > debug_print_object+0x160/0x250 lib/debugobjects.c:481 > Kernel panic - not syncing: panic_on_warn set ... > CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0-rc5+ #28 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: usb_hub_wq hub_event > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0xca/0x13e lib/dump_stack.c:113 > panic+0x2a3/0x6da kernel/panic.c:219 > __warn.cold+0x20/0x4a kernel/panic.c:576 > report_bug+0x262/0x2a0 lib/bug.c:186 > fixup_bug arch/x86/kernel/traps.c:179 [inline] > fixup_bug arch/x86/kernel/traps.c:174 [inline] > do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272 > do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291 > invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028 > RIP: 0010:debug_print_object+0x160/0x250 lib/debugobjects.c:481 > Code: dd 80 ef da 85 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 > 8b 14 dd 80 ef da 85 48 c7 c7 c0 e4 da 85 e8 e5 dd 31 ff <0f> 0b 83 05 4b > 0f a8 05 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89 > RSP: 0018:ffff8881da20f140 EFLAGS: 00010282 > RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff81288cfd RDI: ffffed103b441e1a > RBP: 0000000000000001 R08: ffff8881da1f9800 R09: fffffbfff11ad79a > R10: fffffbfff11ad799 R11: ffffffff88d6bccf R12: ffffffff86d0dc60 > R13: ffffffff812e7b70 R14: ffff8881d56f8f68 R15: ffff8881d4ee4578 > __debug_check_no_obj_freed lib/debugobjects.c:963 [inline] > debug_check_no_obj_freed+0x2df/0x443 lib/debugobjects.c:994 > slab_free_hook mm/slub.c:1420 [inline] > slab_free_freelist_hook mm/slub.c:1474 [inline] > slab_free mm/slub.c:3016 [inline] > kfree+0x20b/0x2f0 mm/slub.c:3957 > appledisplay_probe+0x772/0xb37 drivers/usb/misc/appledisplay.c:312 > usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 > really_probe+0x281/0x6d0 drivers/base/dd.c:548 > driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721 > __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 > bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454 > __device_attach+0x217/0x360 drivers/base/dd.c:894 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 > device_add+0xae6/0x16f0 drivers/base/core.c:2165 > usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023 > generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 > usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 > really_probe+0x281/0x6d0 drivers/base/dd.c:548 > driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721 > __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 > bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454 > __device_attach+0x217/0x360 drivers/base/dd.c:894 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 > device_add+0xae6/0x16f0 drivers/base/core.c:2165 > usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536 > hub_port_connect drivers/usb/core/hub.c:5098 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] > port_event drivers/usb/core/hub.c:5359 [inline] > hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > worker_thread+0x96/0xe20 kernel/workqueue.c:2415 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > 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 #syz dup: KASAN: use-after-free Read in appledisplay_bl_get_brightness
