Message-ID: <000000000000109c040597dc5843@google.com>
Date:   Thu, 21 Nov 2019 06:45:09 -0800
From:   syzbot <syzbot+ec5f884c4a135aa0dbb9@...kaller.appspotmail.com>
To:     andreyknvl@...gle.com, benjamin.tissoires@...hat.com,
        jikos@...nel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: INFO: rcu detected stall in hub_event

Hello,

syzbot found the following crash on:

HEAD commit:    46178223 usb: gadget: add raw-gadget interface
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=15a05836e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=99c88c44660624e7
dashboard link: https://syzkaller.appspot.com/bug?extid=ec5f884c4a135aa0dbb9
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1061395ae00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13653d1ce00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ec5f884c4a135aa0dbb9@...kaller.appspotmail.com

rcu: INFO: rcu_sched self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=8ea/1/0x4000000000000002  
softirq=1810/1810 fqs=5108
	(t=10500 jiffies g=1553 q=595)
NMI backtrace for cpu 0
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
  <IRQ>
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0xca/0x13e lib/dump_stack.c:113
  nmi_cpu_backtrace.cold+0x55/0x96 lib/nmi_backtrace.c:101
  nmi_trigger_cpumask_backtrace+0x1b0/0x1c7 lib/nmi_backtrace.c:62
  trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
  rcu_dump_cpu_stacks+0x169/0x1b3 kernel/rcu/tree_stall.h:254
  print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
  check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
  rcu_pending kernel/rcu/tree.c:2795 [inline]
  rcu_sched_clock_irq.cold+0x4da/0x936 kernel/rcu/tree.c:2244
  update_process_times+0x25/0x60 kernel/time/timer.c:1726
  tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:167
  tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1299
  __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
  __hrtimer_run_queues+0x303/0xc60 kernel/time/hrtimer.c:1576
  hrtimer_interrupt+0x2e8/0x730 kernel/time/hrtimer.c:1638
  local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
  smp_apic_timer_interrupt+0xf5/0x500 arch/x86/kernel/apic/apic.c:1135
  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
  </IRQ>
RIP: 0010:hid_apply_multiplier drivers/hid/hid-core.c:1058 [inline]
RIP: 0010:hid_setup_resolution_multiplier+0x33b/0x990  
drivers/hid/hid-core.c:1114
Code: e8 2a 96 ed fc 48 8d 7d 04 48 89 f8 48 c1 e8 03 42 0f b6 14 38 48 89  
f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 0c 05 00 00 <44> 8b 6d 04 bf  
02 00 00 00 44 89 ee e8 64 97 ed fc 41 83 fd 02 74
RSP: 0018:ffff8881da226cd8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff8450902c
RDX: 0000000000000000 RSI: ffffffff84509036 RDI: ffff8881d4df1204
RBP: ffff8881d4df1200 R08: ffff8881da211800 R09: ffffc900004770cc
R10: fffff5200009241b R11: ffffc900004920db R12: ffff8881c6640000
R13: 0000000000000000 R14: ffff8881d4df1200 R15: dffffc0000000000
  hid_open_report+0x438/0x640 drivers/hid/hid-core.c:1225
  hid_parse include/linux/hid.h:1017 [inline]
  ms_probe+0x12d/0x4d0 drivers/hid/hid-microsoft.c:388
  hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2212
  really_probe+0x281/0x6d0 drivers/base/dd.c:548
  driver_probe_device+0x104/0x210 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:430
  __device_attach+0x217/0x360 drivers/base/dd.c:894
  bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
  device_add+0xae6/0x16f0 drivers/base/core.c:2202
  hid_add_device drivers/hid/hid-core.c:2368 [inline]
  hid_add_device+0x33c/0x9a0 drivers/hid/hid-core.c:2317
  usbhid_probe+0xa81/0xfa0 drivers/hid/usbhid/hid-core.c:1386
  usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
  really_probe+0x281/0x6d0 drivers/base/dd.c:548
  driver_probe_device+0x104/0x210 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:430
  __device_attach+0x217/0x360 drivers/base/dd.c:894
  bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
  device_add+0xae6/0x16f0 drivers/base/core.c:2202
  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+0x104/0x210 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:430
  __device_attach+0x217/0x360 drivers/base/dd.c:894
  bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
  device_add+0xae6/0x16f0 drivers/base/core.c:2202
  usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537
  hub_port_connect drivers/usb/core/hub.c:5184 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
  port_event drivers/usb/core/hub.c:5470 [inline]
  hub_event+0x1df8/0x3800 drivers/usb/core/hub.c:5552
  process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
  process_scheduled_works kernel/workqueue.c:2331 [inline]
  worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
  kthread+0x318/0x420 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352


---
This bug is generated by a bot. It may contain errors.
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