[Bug 1907042] Re: assert issue locates in hw/usb/core.c:727: usb_ep_get: Assertion `pid == USB_TOKEN_IN || pid == USB_TOKEN_OUT' failed

[ZhiQiang Yan]

I trigger the usb_ep_get assertion as well, but I think is't not a bug.(I use 
the ehci)
Maybe the logic is the function return ep_ctl whith USB_TOKEN_SETUP and 
ep==0.Otherwise, will goto the next.

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Title:
  assert issue locates in hw/usb/core.c:727: usb_ep_get: Assertion `pid
  == USB_TOKEN_IN || pid == USB_TOKEN_OUT' failed

Status in QEMU:
  New

Bug description:
  Hello,

  An assertion failure was found in hw/usb/core.c:727 in latest version
  5.2.0.

  Reproduced environment is as follows:
      Host: ubuntu 18.04
      Guest: ubuntu 18.04

  QEMU boot command line:
  qemu-system-x86_64 -enable-kvm -boot c -m 4G -drive 
format=qcow2,file=./ubuntu.img -nic user,hostfwd=tcp:0.0.0.0:5555-:22 -device 
pci-ohci,id=ohci -device usb-tablet,bus=ohci.0,port=1,id=usbdev1 -trace usb\*

  Backtrace is as follows:
  #0  0x00007f13fff14438 in __GI_raise (sig=sig@entry=6) at 
../sysdeps/unix/sysv/linux/raise.c:54
  #1  0x00007f13fff1603a in __GI_abort () at abort.c:89
  #2  0x00007f13fff0cbe7 in __assert_fail_base (fmt=<optimized out>, 
assertion=assertion@entry=0x55f97745ffe0 "pid == USB_TOKEN_IN || pid == 
USB_TOKEN_OUT", file=file@entry=0x55f97745f6c0 "../hw/usb/core.c", 
line=line@entry=727, function=function@entry=0x55f9774606e0 
<__PRETTY_FUNCTION__.22877> "usb_ep_get") at assert.c:92
  #3  0x00007f13fff0cc92 in __GI___assert_fail (assertion=0x55f97745ffe0 "pid 
== USB_TOKEN_IN || pid == USB_TOKEN_OUT", file=0x55f97745f6c0 
"../hw/usb/core.c", line=727, function=0x55f9774606e0 
<__PRETTY_FUNCTION__.22877> "usb_ep_get") at assert.c:101
  #4  0x000055f975bfc9b2 in usb_ep_get (dev=0x62300000c500, pid=45, ep=1) at 
../hw/usb/core.c:727
  #5  0x000055f975f945db in ohci_service_td (ohci=0x6270000191f0, 
ed=0x7ffcd9308410) at ../hw/usb/hcd-ohci.c:1044
  #6  0x000055f975f95d5e in ohci_service_ed_list (ohci=0x6270000191f0, 
head=857580576, completion=0) at ../hw/usb/hcd-ohci.c:1200
  #7  0x000055f975f9656d in ohci_process_lists (ohci=0x6270000191f0, 
completion=0) at ../hw/usb/hcd-ohci.c:1238
  #8  0x000055f975f9725c in ohci_frame_boundary (opaque=0x6270000191f0) at 
../hw/usb/hcd-ohci.c:1281
  #9  0x000055f977212494 in timerlist_run_timers (timer_list=0x60b00005b060) at 
../util/qemu-timer.c:574
  #10 0x000055f9772126db in qemu_clock_run_timers (type=QEMU_CLOCK_VIRTUAL) at 
../util/qemu-timer.c:588
  #11 0x000055f977212fde in qemu_clock_run_all_timers () at 
../util/qemu-timer.c:670
  #12 0x000055f9772d5717 in main_loop_wait (nonblocking=0) at 
../util/main-loop.c:531
  #13 0x000055f97695100c in qemu_main_loop () at ../softmmu/vl.c:1677
  #14 0x000055f9758f7601 in main (argc=16, argv=0x7ffcd9308888, 
envp=0x7ffcd9308910) at ../softmmu/main.c:50
  #15 0x00007f13ffeff840 in __libc_start_main (main=0x55f9758f75b0 <main>, 
argc=16, argv=0x7ffcd9308888, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7ffcd9308878) at ../csu/libc-start.c:291
  #16 0x000055f9758f74a9 in _start ()

  
  The poc is attached.

  Thanks.

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