[Bug 1901981] Re: assert issue locates in hw/usb/dev-storage.c:248: usb_msd_send_status

[Gaoning Pan]

Sorry, my reproduced environment is as follows:
    Host: ubuntu 18.04
    Guest: ubuntu 18.04

Stderr log is as follows:
usb-msd: Reset
usb-msd: Command on LUN 0
usb-msd: Command tag 0x0 flags 00000000 len 0 data 0
[scsi.0 id=0] INQUIRY 0x00 0x00 0x00 0x01 0x00 - from-dev len=1
usb-msd: Deferring packet 0x6110002d2d40 [wait status]
usb-msd: Command status 0 tag 0x0, len 256
qemu-system-x86_64: hw/usb/dev-storage.c:248: usb_msd_send_status: Assertion 
`s->csw.sig == cpu_to_le32(0x53425355)' failed.
[1]    643 abort      sudo  -enable-kvm -boot c -m 4G -drive 
format=qcow2,file=./ubuntu.img -nic


Backtrace is as follows:
#0  0x00007f8b36a63f47 in __GI_raise (sig=sig@entry=6) at 
../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007f8b36a658b1 in __GI_abort () at abort.c:79
#2  0x00007f8b36a5542a in __assert_fail_base (fmt=0x7f8b36bdca38 "%s%s%s:%u: 
%s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x55aef41e7440 
"s->csw.sig == cpu_to_le32(0x53425355)", file=file@entry=0x55aef41e7180 
"hw/usb/dev-storage.c", line=line@entry=248, 
function=function@entry=0x55aef41e7980 <__PRETTY_FUNCTION__.29124> 
"usb_msd_send_status") at assert.c:92
#3  0x00007f8b36a554a2 in __GI___assert_fail 
(assertion=assertion@entry=0x55aef41e7440 "s->csw.sig == 
cpu_to_le32(0x53425355)", file=file@entry=0x55aef41e7180 
"hw/usb/dev-storage.c", line=line@entry=248, 
function=function@entry=0x55aef41e7980 <__PRETTY_FUNCTION__.29124> 
"usb_msd_send_status") at assert.c:101
#4  0x000055aef32226d5 in usb_msd_send_status (s=0x623000001d00, 
p=0x6110002e3500) at hw/usb/dev-storage.c:248
#5  0x000055aef322804e in usb_msd_handle_data (dev=0x623000001d00, 
p=0x6110002e3500) at hw/usb/dev-storage.c:525
#6  0x000055aef30bc46a in usb_device_handle_data (dev=dev@entry=0x623000001d00, 
p=p@entry=0x6110002e3500) at hw/usb/bus.c:179
#7  0x000055aef30a0ab4 in usb_process_one (p=p@entry=0x6110002e3500) at 
hw/usb/core.c:387
#8  0x000055aef30a9db0 in usb_handle_packet (dev=0x623000001d00, 
p=p@entry=0x6110002e3500) at hw/usb/core.c:419
#9  0x000055aef30fe890 in uhci_handle_td (s=s@entry=0x61f000002a80, 
q=0x6060000c9200, q@entry=0x0, qh_addr=qh_addr@entry=0, 
td=td@entry=0x7ffd88f90620, td_addr=<optimized out>, 
int_mask=int_mask@entry=0x7ffd88f905a0) at hw/usb/hcd-uhci.c:899
#10 0x000055aef3104c6f in uhci_process_frame (s=s@entry=0x61f000002a80) at 
hw/usb/hcd-uhci.c:1075
#11 0x000055aef31098e0 in uhci_frame_timer (opaque=0x61f000002a80) at 
hw/usb/hcd-uhci.c:1174
#12 0x000055aef3ae5f95 in timerlist_run_timers (timer_list=0x60b000051be0) at 
util/qemu-timer.c:572
#13 0x000055aef3ae619b in qemu_clock_run_timers (type=QEMU_CLOCK_VIRTUAL) at 
util/qemu-timer.c:586
#14 0x000055aef3ae6922 in qemu_clock_run_all_timers () at util/qemu-timer.c:672
#15 0x000055aef3aca63d in main_loop_wait (nonblocking=0) at util/main-loop.c:523
#16 0x000055aef1f320f5 in qemu_main_loop () at 
/home/zjusvn/new-hyper/qemu-5.1.0/softmmu/vl.c:1676
#17 0x000055aef397475c in main (argc=18, argv=0x7ffd88f90e98, 
envp=0x7ffd88f90f30) at /home/zjusvn/new-hyper/qemu-5.1.0/softmmu/main.c:49
#18 0x00007f8b36a46b97 in __libc_start_main (main=0x55aef397471d <main>, 
argc=18, argv=0x7ffd88f90e98, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7ffd88f90e88) at ../csu/libc-start.c:310
#19 0x000055aef1a3481a in _start ()

thanks.

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https://bugs.launchpad.net/bugs/1901981

Title:
  assert issue locates in hw/usb/dev-storage.c:248: usb_msd_send_status

Status in QEMU:
  New

Bug description:
  Hello,

  I found an assertion failure through hw/usb/dev-storage.c.

  This was found in latest version 5.1.0.

  --------

  qemu-system-x86_64: hw/usb/dev-storage.c:248: usb_msd_send_status: Assertion 
`s->csw.sig == cpu_to_le32(0x53425355)' failed.
  [1]    29544 abort      sudo  -enable-kvm -boot c -m 2G -drive 
format=qcow2,file=./ubuntu.img -nic

  To reproduce the assertion failure, please run the QEMU with following
  command line.

  
  $ qemu-system-x86_64 -enable-kvm -boot c -m 2G -drive 
format=qcow2,file=./ubuntu.img -nic 
user,model=rtl8139,hostfwd=tcp:0.0.0.0:5555-:22 -device piix4-usb-uhci,id=uhci 
-device usb-storage,drive=mydrive -drive 
id=mydrive,file=null-co://,size=2M,format=raw,if=none

  The poc is attached.

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