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Re: [Qemu-devel] Livelock with qemu 2.5.0


From: Brian Candler
Subject: Re: [Qemu-devel] Livelock with qemu 2.5.0
Date: Fri, 2 Dec 2016 15:54:46 +0000
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.5.1

On 02/12/2016 14:19, Brian Candler wrote:
I am running a VM under qemu 2.5.0/Ubuntu 16.04. The guest VM is also Ubuntu 16.04, with ZFS and LXD

Correction: it's btrfs (not zfs).

I re-ran the test with qemu 2.7.0, and this time got a btrfs kernel panic in the guest [below].

The guest is running kernel 4.4.0-45, which I can update to 4.4.0-51 and retry. But at the moment this looks like a kernel btrfs bug, not a qemu bug. Sorry for the noise.

Regards,

Brian.

[  808.782266] BUG: unable to handle kernel
[  808.786126] ------------[ cut here ]------------
[ 808.786152] WARNING: CPU: 2 PID: 25962 at /build/linux-kOWph6/linux-4.4.0/fs/btrfs/inode.c:9374 btrfs_rename2+0x386/0x7b0 [btrfs]()
[  808.786160] BTRFS: Transaction aborted (error -2)
[  808.786160] Modules linked in:
[  808.786161]  binfmt_misc
[  808.786162]  veth
[  808.786163]  ufs
[  808.786163]  qnx4
[  808.786163]  hfsplus
[  808.786164]  hfs
[  808.786164]  minix
[  808.786165]  ntfs
[  808.786165]  msdos
[  808.786166]  jfs
[  808.786166]  xfs
[  808.786167]  xt_CHECKSUM
[  808.786168]  iptable_mangle
[  808.786168]  xt_comment
[  808.786169]  xt_tcpudp
[  808.786169]  bridge
[  808.786170]  stp
[  808.786170]  llc
[  808.786170]  ip6table_filter
[  808.786171]  ip6t_MASQUERADE
[  808.786171]  nf_nat_masquerade_ipv6
[  808.786172]  ip6table_nat
[  808.786173]  nf_conntrack_ipv6
[  808.786173]  nf_defrag_ipv6
[  808.786173]  nf_nat_ipv6
[  808.786174]  ip6_tables
[  808.786174]  iptable_filter
[  808.786175]  ipt_MASQUERADE
[  808.786175]  nf_nat_masquerade_ipv4
[  808.786176]  iptable_nat
[  808.786176]  nf_conntrack_ipv4
[  808.786177]  nf_defrag_ipv4
[  808.786177]  nf_nat_ipv4
[  808.786178]  nf_nat
[  808.786178]  nf_conntrack
[  808.786179]  ip_tables
[  808.786179]  x_tables
[  808.786180]  ppdev
[  808.786180]  kvm_intel
[  808.786181]  input_leds
[  808.786181]  kvm
[  808.786182]  irqbypass
[  808.786182]  joydev
[  808.786182]  parport_pc
[  808.786183]  serio_raw
[  808.786184]  8250_fintek
[  808.786184]  parport
[  808.786185]  mac_hid
[  808.786185]  i2c_piix4
[  808.786185]  ib_iser
[  808.786186]  rdma_cm
[  808.786186]  iw_cm
[  808.786187]  ib_cm
[  808.786187]  ib_sa
[  808.786188]  ib_mad
[  808.786188]  ib_core
[  808.786189]  ib_addr
[  808.786189]  iscsi_tcp
[  808.786190]  libiscsi_tcp
[  808.786190]  libiscsi
[  808.786191]  scsi_transport_iscsi
[  808.786191]  autofs4
[  808.786191]  btrfs
[  808.786192]  raid10
[  808.786192]  raid456
[  808.786193]  async_raid6_recov
[  808.786193]  async_memcpy
[  808.786194]  async_pq
[  808.786194]  async_xor
[  808.786195]  async_tx
[  808.786195]  xor
[  808.786196]  raid6_pq
[  808.786196]  libcrc32c
[  808.786197]  raid1
[  808.786197]  raid0
[  808.786198]  multipath
[  808.786198]  linear
[  808.786199]  cirrus
[  808.786199]  crct10dif_pclmul
[  808.786200]  crc32_pclmul
[  808.786200]  ttm
[  808.786200]  drm_kms_helper
[  808.786201]  aesni_intel
[  808.786201]  syscopyarea
[  808.786202]  sysfillrect
[  808.786202]  aes_x86_64
[  808.786203]  sysimgblt
[  808.786203]  lrw
[  808.786204]  fb_sys_fops
[  808.786204]  gf128mul
[  808.786205]  glue_helper
[  808.786205]  ablk_helper
[  808.786206]  cryptd
[  808.786206]  psmouse
[  808.786206]  drm
[  808.786207]  virtio_scsi
[  808.786207]  pata_acpi
[  808.786208]  floppy

[ 808.786211] CPU: 2 PID: 25962 Comm: dpkg Not tainted 4.4.0-45-generic #66-Ubuntu [ 808.786212] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014
[  808.786213]  0000000000000286
[  808.786213]  0000000039ded762
[  808.786214]  ffff88010184bce0
[  808.786214]  ffffffff813f1fe3

[  808.786215]  ffff88010184bd28
[  808.786215]  ffffffffc03e8220
[  808.786216]  ffff88010184bd18
[  808.786216]  ffffffff81081212

[  808.786217]  ffff880138389538
[  808.786217]  00000000000145e8
[  808.786218]  ffff880115ef1538
[  808.786218]  ffff88016315c418

[  808.786219] Call Trace:
[  808.786224]  [<ffffffff813f1fe3>] dump_stack+0x63/0x90
[  808.786227]  [<ffffffff81081212>] warn_slowpath_common+0x82/0xc0
[  808.786229]  [<ffffffff810812ac>] warn_slowpath_fmt+0x5c/0x80
[  808.786246]  [<ffffffffc0371996>] btrfs_rename2+0x386/0x7b0 [btrfs]
[  808.786249]  [<ffffffff81217f01>] ? __inode_permission+0x1/0xb0
[  808.786251]  [<ffffffff8121adbc>] vfs_rename+0x58c/0x8e0
[ 808.786254] [<ffffffff81344900>] ? security_kernel_fw_from_file+0x40/0x70
[  808.786255]  [<ffffffff8121fc3f>] SyS_rename+0x39f/0x3c0
[  808.786259]  [<ffffffff818318b2>] entry_SYSCALL_64_fastpath+0x16/0x71
[  808.786260] ---[ end trace 9067db09b6daeaab ]---
[ 808.786262] BTRFS: error (device sda1) in btrfs_rename:9374: errno=-2 No such entry
[  808.786263] BTRFS info (device sda1): forced readonly
[  808.961571] paging request
[  808.963405]  at fffffffffffffe58
[ 808.965154] IP: [<ffffffffc0368d3c>] __btrfs_unlink_inode+0x1c/0x470 [btrfs]
[  808.967516] PGD 1e0d067 PUD 1e0f067 PMD 0
[  808.969640] Oops: 0000 [#1] SMP
[ 808.971654] Modules linked in: binfmt_misc veth ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs xt_CHECKSUM iptable_mangle xt_comment xt_tcpudp bridge stp llc ip6table_filter ip6t_MASQUERADE nf_nat_masquerade_ipv6 ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6_tables iptable_filter ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables ppdev kvm_intel input_leds kvm irqbypass joydev parport_pc serio_raw 8250_fintek parport mac_hid i2c_piix4 ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear cirrus crct10dif_pclmul [ 808.991391] crc32_pclmul ttm drm_kms_helper aesni_intel syscopyarea sysfillrect aes_x86_64 sysimgblt lrw fb_sys_fops gf128mul glue_helper ablk_helper cryptd psmouse drm virtio_scsi pata_acpi floppy [ 808.997652] CPU: 0 PID: 20735 Comm: dpkg Tainted: G W 4.4.0-45-generic #66-Ubuntu [ 809.000758] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014 [ 809.006530] task: ffff880287caac40 ti: ffff8800733a8000 task.ti: ffff8800733a8000 [ 809.009620] RIP: 0010:[<ffffffffc0368d3c>] [<ffffffffc0368d3c>] __btrfs_unlink_inode+0x1c/0x470 [btrfs]
[  809.012942] RSP: 0018:ffff8800733abd08  EFLAGS: 00010282
[ 809.015766] RAX: ffff8802eb6dfdb0 RBX: ffff88010c748598 RCX: 0000000000000000 [ 809.042530] RDX: ffff88010c748598 RSI: ffff880256bc0000 RDI: ffff8803aeea9850 [ 809.045379] RBP: ffff8800733abd80 R08: 0000000000000000 R09: 00000000ffffffff [ 809.048307] R10: 00000000157d46a0 R11: 0000000000000002 R12: 0000000000000000 [ 809.051271] R13: ffff8801e5acf6e0 R14: 0000000000000000 R15: ffff88014d7f2f00 [ 809.054167] FS: 00007f0ab8677800(0000) GS:ffff8803bfc00000(0000) knlGS:0000000000000000
[  809.058724] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 809.071232] CR2: fffffffffffffe58 CR3: 0000000307f90000 CR4: 00000000003406f0 [ 809.074297] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 809.086657] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  809.089377] Stack:
[ 809.091519] ffff88014d7f2f38 ffff8803aeea9850 ffff88000000000e 000000000000238b [ 809.094282] 386c8800733abd80 7d0c000000000001 000000000000007b ffffffff810caa91 [ 809.097019] 0000000000000002 ffffea000c9e7080 ffff88010c748598 000000000001386c
[  809.099746] Call Trace:
[ 809.101950] [<ffffffff810caa91>] ? __raw_callee_save___pv_queued_spin_unlock+0x11/0x20
[  809.104744]  [<ffffffffc0371954>] btrfs_rename2+0x344/0x7b0 [btrfs]
[  809.107358]  [<ffffffff8121adbc>] vfs_rename+0x58c/0x8e0
[ 809.109810] [<ffffffff81344900>] ? security_kernel_fw_from_file+0x40/0x70
[  809.112490]  [<ffffffff8121fc3f>] SyS_rename+0x39f/0x3c0
[  809.115029]  [<ffffffff818318b2>] entry_SYSCALL_64_fastpath+0x16/0x71
[ 809.117687] Code: ff e9 41 ff ff ff 48 8b 53 40 eb eb 0f 1f 00 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 49 89 cc 53 48 89 d3 48 83 ec 50 <4c> 8b a9 58 fe ff ff 65 48 8b 04 25 28 00 00 00 48 89 44 24 48 [ 809.124816] RIP [<ffffffffc0368d3c>] __btrfs_unlink_inode+0x1c/0x470 [btrfs]
[  809.127667]  RSP <ffff8800733abd08>
[  809.130057] CR2: fffffffffffffe58
[  809.135772] ---[ end trace 9067db09b6daeaac ]---
[  809.211377] lxdbr0: port 33(vethTL9MO4) entered forwarding state




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