After debugging the object code, I can see that the error occurs because
of corruption in the internal AVL tree; the bug occurs during an
insertion into the AVL tree in avl_insert(), namely when nullifying
node->avl_child[0]:
node->avl_child[0] = NULL;
node->avl_child[1] = NULL;
>From what I gather, it looks like there is some internal memory
corruption probably causing this issue. Without a full kernel core I
can't track this back much further, so my current hunch is that this may
not be a software error after all. I've had an extensive hunt around
and cannot find similar breakage patterns, so I'm fairly confident this
may be a one-off memory issue. I'm going to close this as Won't Fix,
but if it happens again, please feel free to re-open the bug.
** Changed in: zfs-linux (Ubuntu)
Status: Confirmed => Won't Fix
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Packages, which is subscribed to zfs-linux in Ubuntu.
https://bugs.launchpad.net/bugs/1749715
Title:
general protection fault in zfs module
Status in zfs-linux package in Ubuntu:
Won't Fix
Bug description:
Got this call trace during a rsync backup of a machine using ZFS:
general protection fault: 0000 [#1] SMP
Modules linked in: ip6table_filter ip6_tables xt_tcpudp xt_conntrack
iptable_filter ip_tables x_tables zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO)
spl(O) zavl(PO) input_leds sch_fq_codel nf_conntrack_ipv6 nf_defrag_ipv6
nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack virtio_scsi
CPU: 0 PID: 4238 Comm: rsync Tainted: P O 4.4.0-112-generic
#135-Ubuntu
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
Ubuntu-1.8.2-1ubuntu1 04/01/2014
task: ffff880078a4f2c0 ti: ffff880047c28000 task.ti: ffff880047c28000
RIP: 0010:[<ffffffffc03135b3>] [<ffffffffc03135b3>] avl_insert+0x33/0xe0
[zavl]
RSP: 0018:ffff880047c2bc20 EFLAGS: 00010246
RAX: 0000000000000001 RBX: ffff880043b46200 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 001f880043b46208 RDI: ffff88005aa0c9a8
RBP: ffff880047c2bc20 R08: 0000000000000000 R09: ffff88007d001700
R10: ffff880043b46200 R11: 0000000000000246 R12: ffff88005aa0c9a8
R13: ffff880043b46200 R14: 0000000000000000 R15: ffff88005aa0c9a8
FS: 00007f04124ec700(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd25c1cb8c CR3: 0000000047cb0000 CR4: 0000000000000670
Stack:
ffff880047c2bc68 ffffffffc0313721 0000000000000000 0020000000000008
ffff880043b46200 ffff88005aa0c8c8 0000000000006b34 0000000000000000
ffff88005aa0c9a8 ffff880047c2bcc8 ffffffffc04609ee 0000000000000000
Call Trace:
[<ffffffffc0313721>] avl_add+0x71/0xa0 [zavl]
[<ffffffffc04609ee>] zfs_range_lock+0x3ee/0x5e0 [zfs]
[<ffffffffc0416e4c>] ? rrw_enter_read_impl+0xbc/0x160 [zfs]
[<ffffffffc0465c90>] zfs_read+0xd0/0x3c0 [zfs]
[<ffffffff9b39922d>] ? profile_path_perm.part.7+0x7d/0xa0
[<ffffffffc04818f0>] zpl_read_common_iovec+0x80/0xd0 [zfs]
[<ffffffffc0482430>] zpl_iter_read+0xa0/0xd0 [zfs]
[<ffffffff9b211134>] new_sync_read+0x94/0xd0
[<ffffffff9b211196>] __vfs_read+0x26/0x40
[<ffffffff9b211756>] vfs_read+0x86/0x130
[<ffffffff9b2124a5>] SyS_read+0x55/0xc0
[<ffffffff9b8456c7>] ? entry_SYSCALL_64_after_swapgs+0xd1/0x18c
[<ffffffff9b8457ad>] entry_SYSCALL_64_fastpath+0x2b/0xe7
Code: 83 e2 01 48 03 77 10 49 83 e0 fe 8d 04 95 00 00 00 00 55 4c 89 c1 48 83
47 18 01 83 e0 04 48 83 c9 01 48 89 e5 48 09 c8 4d 85 c0 <48> c7 06 00 00 00 00
48 c7 46 08 00 00 00 00 48 89 46 10 0f 84
RIP [<ffffffffc03135b3>] avl_insert+0x33/0xe0 [zavl]
RSP <ffff880047c2bc20>
---[ end trace c4ba4478b6002697 ]---
This is the first time it happens but I'll report any future occurrence in
here.
Additional info:
$ lsb_release -rd
Description: Ubuntu 16.04.3 LTS
Release: 16.04
$ apt-cache policy linux-image-4.4.0-112-generic zfsutils-linux
linux-image-4.4.0-112-generic:
Installed: 4.4.0-112.135
Candidate: 4.4.0-112.135
Version table:
*** 4.4.0-112.135 500
500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64
Packages
100 /var/lib/dpkg/status
zfsutils-linux:
Installed: 0.6.5.6-0ubuntu18
Candidate: 0.6.5.6-0ubuntu18
Version table:
*** 0.6.5.6-0ubuntu18 500
500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
100 /var/lib/dpkg/status
0.6.5.6-0ubuntu8 500
500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-112-generic 4.4.0-112.135
ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
Uname: Linux 4.4.0-112-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Feb 14 16:19 seq
crw-rw---- 1 root audio 116, 33 Feb 14 16:19 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: [Errno 2] No such file or directory: 'fuser'
CRDA: N/A
CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read
kernel buffer failed: Operation not permitted
Date: Thu Feb 15 08:45:07 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lspci: Error: [Errno 2] No such file or directory: 'lspci'
Lsusb: Error: [Errno 2] No such file or directory: 'lsusb'
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
PciMultimedia:
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-112-generic
root=UUID=db4864d4-cc2e-40c7-bc2b-a14bc0f09c9f ro console=ttyS0 net.ifnames=0
kaslr nmi_watchdog=0 possible_cpus=1 vsyscall=none pti=on
RelatedPackageVersions:
linux-restricted-modules-4.4.0-112-generic N/A
linux-backports-modules-4.4.0-112-generic N/A
linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-2.5
dmi.modalias:
dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-2.5:cvnQEMU:ct1:cvrpc-i440fx-2.5:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-2.5
dmi.sys.vendor: QEMU
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