Public bug reported:
On a server machine that runs a pppoe server I have noticed a high load
average on a idle machine (CPU is 90% idle). Looking at kernel logs I
have found following:
------------[ cut here ]------------
kernel BUG at
/build/linux-lts-wily-Ejb_ce/linux-lts-wily-4.2.0/drivers/net/ppp/ppp_generic.c:291!
invalid opcode: 0000 [#1] SMP
Modules linked in: btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos
jfs xfs libcrc32c act_mirred sch_ingress cls_fw cls_u32 sch
iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat xt_CT
nf_conntrack iptable_raw ipt_REJECT nf_reject_ipv4 xt_tcpudp iptab
p llc ebtable_filter ebtables x_tables ppdev kvm_intel kvm crct10dif_pclmul
crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper
pvpanic lp 8250_fintek parport_pc parport cirrus ttm drm_kms_helper mac_hid drm
syscopyarea sysfillrect sysimgblt i2c_piix4 psmouse flop
CPU: 0 PID: 1667 Comm: pppd Not tainted 4.2.0-42-generic #49~14.04.1-Ubuntu
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff8800660a3700 ti: ffff88002f36c000 task.ti: ffff88002f36c000
RIP: 0010:[<ffffffff817bdbc9>] [<ffffffff817bdbc9>] ppp_pernet.part.16+0x4/0x6
RSP: 0018:ffff88002f36fdf8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 000000004004743a RCX: 000000000065b528
RDX: 00000000000001c3 RSI: 000000004004743a RDI: ffffffff81cdd580
RBP: ffff88002f36fdf8 R08: 0000000000000000 R09: 00000000020c84e0
R10: 00007ffcefbbf610 R11: 0000000000000246 R12: ffff880021176900
R13: ffff880021176500 R14: 000000000065b528 R15: 000000000065b528
FS: 00007fb63fc07740(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5bbfeb5000 CR3: 0000000069b49000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
ffff88002f36fe78 ffffffff8159e7fa ffffffff81cede80 ffffffff000001c3
ffff880036567ca8 00000000000001c3 8080808080808080 0000000000000000
00000000fffffe00 ffffffff8120b324 0000000000000001 ffff880021176500
Call Trace:
[<ffffffff8159e7fa>] ppp_ioctl+0xdca/0xde0
[<ffffffff8120b324>] ? __fd_install+0x24/0xc0
[<ffffffff8120116d>] do_vfs_ioctl+0x2cd/0x4b0
[<ffffffff811fd12f>] ? putname+0x5f/0x70
[<ffffffff810c0f71>] ? __raw_callee_save___pv_queued_spin_unlock+0x11/0x20
[<ffffffff812013c9>] SyS_ioctl+0x79/0x90
[<ffffffff817c36f2>] entry_SYSCALL_64_fastpath+0x16/0x75
Code: 00 00 00 48 c7 c7 58 9a a9 81 48 89 e5 e8 b0 be 8b ff 5d c6 05 97 97 54
00 01 c3 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 55 48 89 e5 <0f> 0b 55 48 89 e5 0f
0b 0f 1f 44 00 00 55 48 c7 c7 20 d7 cd 81
RIP [<ffffffff817bdbc9>] ppp_pernet.part.16+0x4/0x6
RSP <ffff88002f36fdf8>
---[ end trace e5e2f1c7519e1d6c ]---
Except from unusually high load average I have noticed no other
problems. But some services on a machine do monitor load average and
shut down if it goes too high, so I had to reboot a machine to fix the
issue.
I'll be happy to give any additional information required to fix this
bug.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-headers-4.2.0-42 4.2.0-42.49~14.04.1
ProcVersionSignature: Ubuntu 4.2.0-42.49~14.04.1-generic 4.2.8-ckt12
Uname: Linux 4.2.0-42-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
Date: Thu Aug 25 12:19:02 2016
InstallationDate: Installed on 2012-07-25 (1491 days ago)
InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64
(20120424.1)
PackageArchitecture: all
SourcePackage: linux-lts-wily
UpgradeStatus: Upgraded to trusty on 2013-04-10 (1233 days ago)
** Affects: linux-lts-wily (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1616771
Title:
kernel BUG in ppp_generic.c, high load average after that
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