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[Qemu-devel] [Bug 1815252] [NEW] virtio-9p-pci passthrough fsync hang

From: john
Subject: [Qemu-devel] [Bug 1815252] [NEW] virtio-9p-pci passthrough fsync hang
Date: Fri, 08 Feb 2019 23:06:39 -0000 
Public bug reported:

Tested against QEMU: e47f81b617684c4546af286d307b69014a83538a

and $qemu-system-x86_64 --version
QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.9)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

+ exec sudo qemu-system-x86_64 -enable-kvm -bios /usr/share/ovmf/OVMF.fd -cpu 
host -smp sockets=1,cpus=4,cores=2 -m 2048 -vga none -nographic -chardev 
socket,id=chrtpm0,path=/tmp/clrwifi/swtpm2/tpm-sock -tpmdev 
emulator,id=tpm0,chardev=chrtpm0 -device tpm-tis,tpmdev=tpm0 -device 
virtio-rng-pci -netdev user,id=mynet0,hostfwd=tcp::10022-:22 -device 
virtio-net-pci,netdev=mynet0 -kernel /home/.../Documents/c/iwd/tools/bzImage 
-append 'console=ttyS0,115200n8 quiet kvm-intel.nested=1 init=/usr/bin/bash 
initcall_debug tsc=reliable no_timer_check noreplace-smp cryptomgr.notests 
rootfstype=9p root=/dev/root rootflags=trans=virtio,version=9p2000.u rw' -fsdev 
local,id=fsdev-root,path=mnt,security_model=passthrough -device 
virtio-9p-pci,fsdev=fsdev-root,mount_tag=/dev/root
[    0.000000] Linux version 4.19.0-rc2 (...) (gcc version 7.3.0 (Ubuntu 
7.3.0-27ubuntu1~18.04)) #10 SMP Fri Feb 8 13:55:20 PST 2019
[    0.000000] Command line: console=ttyS0,115200n8 quiet kvm-intel.nested=1 
init=/usr/bin/bash initcall_debug tsc=reliable no_timer_check noreplace-smp 
cryptomgr.notests rootfstype=9p root=/dev/root 
rootflags=trans=virtio,version=9p2000.u rw
[    0.000000] KERNEL supported cpus:
[    0.000000]   Intel GenuineIntel
[    0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point 
registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
[    0.000000] x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
[    0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, 
using 'standard' format.
[    0.000000] BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009ffff] usable
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000007fffff] usable
[    0.000000] BIOS-e820: [mem 0x0000000000800000-0x0000000000807fff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x0000000000808000-0x000000000080ffff] usable
[    0.000000] BIOS-e820: [mem 0x0000000000810000-0x00000000008fffff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x0000000000900000-0x000000007e87efff] usable
[    0.000000] BIOS-e820: [mem 0x000000007e87f000-0x000000007e888fff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x000000007e889000-0x000000007e889fff] ACPI data
[    0.000000] BIOS-e820: [mem 0x000000007e88a000-0x000000007e88bfff] usable
[    0.000000] BIOS-e820: [mem 0x000000007e88c000-0x000000007e88ffff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x000000007e890000-0x000000007e8a9fff] reserved
[    0.000000] BIOS-e820: [mem 0x000000007e8aa000-0x000000007e8b9fff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x000000007e8ba000-0x000000007e8bafff] reserved
[    0.000000] BIOS-e820: [mem 0x000000007e8bb000-0x000000007e9e5fff] usable
[    0.000000] BIOS-e820: [mem 0x000000007e9e6000-0x000000007e9edfff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x000000007e9ee000-0x000000007eb1afff] reserved
[    0.000000] BIOS-e820: [mem 0x000000007eb1b000-0x000000007fb9afff] usable
[    0.000000] BIOS-e820: [mem 0x000000007fb9b000-0x000000007fbf2fff] reserved
[    0.000000] BIOS-e820: [mem 0x000000007fbf3000-0x000000007fbfafff] ACPI data
[    0.000000] BIOS-e820: [mem 0x000000007fbfb000-0x000000007fbfefff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x000000007fbff000-0x000000007ff3ffff] usable
[    0.000000] BIOS-e820: [mem 0x000000007ff40000-0x000000007ff5ffff] reserved
[    0.000000] BIOS-e820: [mem 0x000000007ff60000-0x000000007fffffff] ACPI NVS
[    0.352469] acpiphp_ibm: ibm_acpiphp_init: acpi_walk_namespace failed
Started bpfilter
bash: cannot set terminal process group (-1): Inappropriate ioctl for device
bash: no job control in this shell
grep: /proc/cpuinfo: No such file or directory
grep: /proc/cpuinfo: No such file or directory
address@hidden / # passwd
...
openat(AT_FDCWD, "/etc/nshadow", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 4
umask(077)                              = 077
openat(AT_FDCWD, "/etc/shadow", O_RDONLY|O_CREAT|O_CLOEXEC, 000) = 5
fcntl(5, F_GETFL)                       = 0x8000 (flags O_RDONLY|O_LARGEFILE)
fstat(5, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
fchown(4, 0, 0)                         = 0
fchmod(4, 0100644)                      = 0
lseek(5, 0, SEEK_CUR)                   = 0
fstat(5, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
read(5, "", 8192)                       = 0
close(5)                                = 0
fstat(4, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
write(4, "root:$6$jihvB1NonG88C5Yt$kvDCqF7"..., 124) = 124
fsync(4 <- hung here

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "Reproduce script"
   https://bugs.launchpad.net/bugs/1815252/+attachment/5237111/+files/setup.sh

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https://bugs.launchpad.net/bugs/1815252

Title:
  virtio-9p-pci passthrough fsync hang

Status in QEMU:
  New

Bug description:
  Tested against QEMU: e47f81b617684c4546af286d307b69014a83538a

  and $qemu-system-x86_64 --version
  QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.9)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  + exec sudo qemu-system-x86_64 -enable-kvm -bios /usr/share/ovmf/OVMF.fd -cpu 
host -smp sockets=1,cpus=4,cores=2 -m 2048 -vga none -nographic -chardev 
socket,id=chrtpm0,path=/tmp/clrwifi/swtpm2/tpm-sock -tpmdev 
emulator,id=tpm0,chardev=chrtpm0 -device tpm-tis,tpmdev=tpm0 -device 
virtio-rng-pci -netdev user,id=mynet0,hostfwd=tcp::10022-:22 -device 
virtio-net-pci,netdev=mynet0 -kernel /home/.../Documents/c/iwd/tools/bzImage 
-append 'console=ttyS0,115200n8 quiet kvm-intel.nested=1 init=/usr/bin/bash 
initcall_debug tsc=reliable no_timer_check noreplace-smp cryptomgr.notests 
rootfstype=9p root=/dev/root rootflags=trans=virtio,version=9p2000.u rw' -fsdev 
local,id=fsdev-root,path=mnt,security_model=passthrough -device 
virtio-9p-pci,fsdev=fsdev-root,mount_tag=/dev/root
  [    0.000000] Linux version 4.19.0-rc2 (...) (gcc version 7.3.0 (Ubuntu 
7.3.0-27ubuntu1~18.04)) #10 SMP Fri Feb 8 13:55:20 PST 2019
  [    0.000000] Command line: console=ttyS0,115200n8 quiet kvm-intel.nested=1 
init=/usr/bin/bash initcall_debug tsc=reliable no_timer_check noreplace-smp 
cryptomgr.notests rootfstype=9p root=/dev/root 
rootflags=trans=virtio,version=9p2000.u rw
  [    0.000000] KERNEL supported cpus:
  [    0.000000]   Intel GenuineIntel
  [    0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point 
registers'
  [    0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
  [    0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
  [    0.000000] x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
  [    0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 
bytes, using 'standard' format.
  [    0.000000] BIOS-provided physical RAM map:
  [    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009ffff] usable
  [    0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000007fffff] usable
  [    0.000000] BIOS-e820: [mem 0x0000000000800000-0x0000000000807fff] ACPI NVS
  [    0.000000] BIOS-e820: [mem 0x0000000000808000-0x000000000080ffff] usable
  [    0.000000] BIOS-e820: [mem 0x0000000000810000-0x00000000008fffff] ACPI NVS
  [    0.000000] BIOS-e820: [mem 0x0000000000900000-0x000000007e87efff] usable
  [    0.000000] BIOS-e820: [mem 0x000000007e87f000-0x000000007e888fff] ACPI NVS
  [    0.000000] BIOS-e820: [mem 0x000000007e889000-0x000000007e889fff] ACPI 
data
  [    0.000000] BIOS-e820: [mem 0x000000007e88a000-0x000000007e88bfff] usable
  [    0.000000] BIOS-e820: [mem 0x000000007e88c000-0x000000007e88ffff] ACPI NVS
  [    0.000000] BIOS-e820: [mem 0x000000007e890000-0x000000007e8a9fff] reserved
  [    0.000000] BIOS-e820: [mem 0x000000007e8aa000-0x000000007e8b9fff] ACPI NVS
  [    0.000000] BIOS-e820: [mem 0x000000007e8ba000-0x000000007e8bafff] reserved
  [    0.000000] BIOS-e820: [mem 0x000000007e8bb000-0x000000007e9e5fff] usable
  [    0.000000] BIOS-e820: [mem 0x000000007e9e6000-0x000000007e9edfff] ACPI NVS
  [    0.000000] BIOS-e820: [mem 0x000000007e9ee000-0x000000007eb1afff] reserved
  [    0.000000] BIOS-e820: [mem 0x000000007eb1b000-0x000000007fb9afff] usable
  [    0.000000] BIOS-e820: [mem 0x000000007fb9b000-0x000000007fbf2fff] reserved
  [    0.000000] BIOS-e820: [mem 0x000000007fbf3000-0x000000007fbfafff] ACPI 
data
  [    0.000000] BIOS-e820: [mem 0x000000007fbfb000-0x000000007fbfefff] ACPI NVS
  [    0.000000] BIOS-e820: [mem 0x000000007fbff000-0x000000007ff3ffff] usable
  [    0.000000] BIOS-e820: [mem 0x000000007ff40000-0x000000007ff5ffff] reserved
  [    0.000000] BIOS-e820: [mem 0x000000007ff60000-0x000000007fffffff] ACPI NVS
  [    0.352469] acpiphp_ibm: ibm_acpiphp_init: acpi_walk_namespace failed
  Started bpfilter
  bash: cannot set terminal process group (-1): Inappropriate ioctl for device
  bash: no job control in this shell
  grep: /proc/cpuinfo: No such file or directory
  grep: /proc/cpuinfo: No such file or directory
  address@hidden / # passwd
  ...
  openat(AT_FDCWD, "/etc/nshadow", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 4
  umask(077)                              = 077
  openat(AT_FDCWD, "/etc/shadow", O_RDONLY|O_CREAT|O_CLOEXEC, 000) = 5
  fcntl(5, F_GETFL)                       = 0x8000 (flags O_RDONLY|O_LARGEFILE)
  fstat(5, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
  fchown(4, 0, 0)                         = 0
  fchmod(4, 0100644)                      = 0
  lseek(5, 0, SEEK_CUR)                   = 0
  fstat(5, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
  read(5, "", 8192)                       = 0
  close(5)                                = 0
  fstat(4, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
  write(4, "root:$6$jihvB1NonG88C5Yt$kvDCqF7"..., 124) = 124
  fsync(4 <- hung here

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