# Kernel error: DWARF2 unwinder stuck at system\_call **URL:** \ **Category:** SLES Hardware\ **Created:** [October 16, 2012, 6:06pm UTC](https://forums.suse.com/t/kernel-error-dwarf2-unwinder-stuck-at-system-call/23207 "2012-10-16T18:06:18Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![lash04](https://avatars.discourse-cdn.com/v4/letter/l/dc4da7/32.png) [@lash04](https://forums.suse.com/u/lash04)\ **Post date:** [October 16, 2012, 6:06pm UTC](https://forums.suse.com/t/kernel-error-dwarf2-unwinder-stuck-at-system-call/23207/1 "2012-10-16T18:06:18Z")
Hi Everyone, Following error can be found in /var/log/messages: Oct 15 05:30:03 sapnode02 kernel: [1333391.788876] ------------[cut here]------------ Oct 15 05:30:03 sapnode02 kernel: [1333391.788895] WARNING: at /usr/src/packages/BUILD/kernel-default-3.0.13/linux-3.0/fs/dcache.c:2584 prepend\_path+0x189/0x1a0() Oct 15 05:30:03 sapnode02 kernel: [1333391.788903] Hardware name: ProLiant DL585 G7 Oct 15 05:30:03 sapnode02 kernel: [1333391.788907] Root dentry has weird name \<\> Oct 15 05:30:03 sapnode02 kernel: [1333391.788911] Modules linked in: lp parport\_pc st ide\_cd\_mod ide\_core ppdev parport ext2 usb\_storage af\_packet binfmt\_misc edd nfs lockd fscache auth\_rpcgss nfs\_acl sunrpc bonding mperf microcode fuse loop dm\_round\_robin dm\_multipath ipv6\_lib netxen\_nic hpwdt sg sr\_mod hpilo i2c\_piix4 pcspkr joydev i2c\_core k10temp cdrom container rtc\_cmos acpi\_power\_meter button ext3 jbd mbcache dm\_mirror dm\_region\_hash dm\_log linear sd\_mod crc\_t10dif usbhid hid ohci\_hcd uhci\_hcd qla2xxx ehci\_hcd scsi\_transport\_fc scsi\_tgt usbcore usb\_common processor thermal\_sys hwmon scsi\_dh\_emc scsi\_dh\_hp\_sw scsi\_dh\_alua scsi\_dh\_rdac scsi\_dh dm\_snapshot dm\_mod ata\_generic pata\_atiixp ahci libahci libata hpsa cciss scsi\_mod [last unloaded: parport\_pc] Oct 15 05:30:03 sapnode02 kernel: [1333391.789039] Supported: Yes Oct 15 05:30:03 sapnode02 kernel: [1333391.789046] Pid: 38130, comm: checkproc Tainted: G W 3.0.13-0.27-default #1 Oct 15 05:30:03 sapnode02 kernel: [1333391.789051] Call Trace: Oct 15 05:30:03 sapnode02 kernel: [1333391.789087] [] dump\_trace+0x75/0x300 Oct 15 05:30:03 sapnode02 kernel: [1333391.789106] [] dump\_stack+0x69/0x6f Oct 15 05:30:03 sapnode02 kernel: [1333391.789124] [] warn\_slowpath\_common+0x7b/0xc0 Oct 15 05:30:03 sapnode02 kernel: [1333391.789140] [] warn\_slowpath\_fmt+0x45/0x50 Oct 15 05:30:03 sapnode02 kernel: [1333391.789156] [] prepend\_path+0x189/0x1a0 Oct 15 05:30:03 sapnode02 kernel: [1333391.789172] [] d\_path+0xc7/0x100 Oct 15 05:30:03 sapnode02 kernel: [1333391.789187] [] proc\_pid\_readlink+0xa0/0x100 Oct 15 05:30:03 sapnode02 kernel: [1333391.789206] [] sys\_readlinkat+0xbd/0xd0 Oct 15 05:30:03 sapnode02 kernel: [1333391.789222] [] system\_call\_fastpath+0x16/0x1b Oct 15 05:30:03 sapnode02 kernel: [1333391.791940] DWARF2 unwinder stuck at system\_call\_fastpath+0x16/0x1b Oct 15 05:30:03 sapnode02 kernel: [1333391.791945] Oct 15 05:30:03 sapnode02 kernel: [1333391.791948] Leftover inexact backtrace: Oct 15 05:30:03 sapnode02 kernel: [1333391.791951] Oct 15 05:30:03 sapnode02 kernel: [1333391.791959] —[end trace 34097b7e21958987]— Oct 15 05:30:03 sapnode02 kernel: klogd 1.4.1, ---------- state change ---------- Oct 15 05:30:04 sapnode02 kernel: [1333391.904945] ------------[cut here]------------ Any reason for this kinda message?? The other thing is, this particular server is part of a cluster. The cluster communication get disconnected sometimes (can’t ping to the other server). When the server is reboot, several network restart are carried out to this server to make sure the communication is back online.any root cause for this?? Note: After OS installation (SLES 11 SP2 SAP version) a firmware update has done as well. Your Assistance on this is highly appreciated. ---
**Author:** ![malcolmlewis](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/malcolmlewis/32/11375_2.png) [@malcolmlewis](https://forums.suse.com/u/malcolmlewis)\ **Post date:** [October 16, 2012, 7:35pm UTC](https://forums.suse.com/t/kernel-error-dwarf2-unwinder-stuck-at-system-call/23207/2 "2012-10-16T19:35:51Z")
> [@lash04](#): > > Hi Everyone, > > Following error can be found in /var/log/messages: > > ## Oct 15 05:30:03 sapnode02 kernel: [1333391.788876] ------------[cut here]------------ Oct 15 05:30:03 sapnode02 kernel: [1333391.788895] WARNING: at /usr/src/packages/BUILD/kernel-default-3.0.13/linux-3.0/fs/dcache.c:2584 prepend\_path+0x189/0x1a0() Oct 15 05:30:03 sapnode02 kernel: [1333391.788903] Hardware name: ProLiant DL585 G7 Oct 15 05:30:03 sapnode02 kernel: [1333391.788907] Root dentry has weird name \<\> Oct 15 05:30:03 sapnode02 kernel: [1333391.788911] Modules linked in: lp parport\_pc st ide\_cd\_mod ide\_core ppdev parport ext2 usb\_storage af\_packet binfmt\_misc edd nfs lockd fscache auth\_rpcgss nfs\_acl sunrpc bonding mperf microcode fuse loop dm\_round\_robin dm\_multipath ipv6\_lib netxen\_nic hpwdt sg sr\_mod hpilo i2c\_piix4 pcspkr joydev i2c\_core k10temp cdrom container rtc\_cmos acpi\_power\_meter button ext3 jbd mbcache dm\_mirror dm\_region\_hash dm\_log linear sd\_mod crc\_t10dif usbhid hid ohci\_hcd uhci\_hcd qla2xxx ehci\_hcd scsi\_transport\_fc scsi\_tgt usbcore usb\_common processor thermal\_sys hwmon scsi\_dh\_emc scsi\_dh\_hp\_sw scsi\_dh\_alua scsi\_dh\_rdac scsi\_dh dm\_snapshot dm\_mod ata\_generic pata\_atiixp ahci libahci libata hpsa cciss scsi\_mod [last unloaded: parport\_pc] Oct 15 05:30:03 sapnode02 kernel: [1333391.789039] Supported: Yes Oct 15 05:30:03 sapnode02 kernel: [1333391.789046] Pid: 38130, comm: checkproc Tainted: G W 3.0.13-0.27-default #1 Oct 15 05:30:03 sapnode02 kernel: [1333391.789051] Call Trace: Oct 15 05:30:03 sapnode02 kernel: [1333391.789087] [] dump\_trace+0x75/0x300 Oct 15 05:30:03 sapnode02 kernel: [1333391.789106] [] dump\_stack+0x69/0x6f Oct 15 05:30:03 sapnode02 kernel: [1333391.789124] [] warn\_slowpath\_common+0x7b/0xc0 Oct 15 05:30:03 sapnode02 kernel: [1333391.789140] [] warn\_slowpath\_fmt+0x45/0x50 Oct 15 05:30:03 sapnode02 kernel: [1333391.789156] [] prepend\_path+0x189/0x1a0 Oct 15 05:30:03 sapnode02 kernel: [1333391.789172] [] d\_path+0xc7/0x100 Oct 15 05:30:03 sapnode02 kernel: [1333391.789187] [] proc\_pid\_readlink+0xa0/0x100 Oct 15 05:30:03 sapnode02 kernel: [1333391.789206] [] sys\_readlinkat+0xbd/0xd0 Oct 15 05:30:03 sapnode02 kernel: [1333391.789222] [] system\_call\_fastpath+0x16/0x1b Oct 15 05:30:03 sapnode02 kernel: [1333391.791940] DWARF2 unwinder stuck at system\_call\_fastpath+0x16/0x1b Oct 15 05:30:03 sapnode02 kernel: [1333391.791945] Oct 15 05:30:03 sapnode02 kernel: [1333391.791948] Leftover inexact backtrace: Oct 15 05:30:03 sapnode02 kernel: [1333391.791951] Oct 15 05:30:03 sapnode02 kernel: [1333391.791959] —[end trace 34097b7e21958987]— Oct 15 05:30:03 sapnode02 kernel: klogd 1.4.1, ---------- state change > > Oct 15 05:30:04 sapnode02 kernel: [1333391.904945] ------------[ cut > here ]------------ > > Any reason for this kinda message?? The other thing is, this particular > server is part of a cluster. The cluster communication get disconnected > sometimes (can’t ping to the other server). When the server is reboot, > several network restart are carried out to this server to make sure the > communication is back online.any root cause for this?? > > Note: After OS installation (SLES 11 SP2 SAP version) a firmware update > has done as well. > > Your Assistance on this is highly appreciated. Hi That’s really a bugzilla ([https://bugzilla.novell.com/index.cgi](https://bugzilla.novell.com/index.cgi)) or if you have the option, raise an SR to get that looked at. – Cheers Malcolm °¿° (Linux Counter #276890) openSUSE 12.2 (x86\_64) Kernel 3.4.11-2.16-desktop up 20:58, 3 users, load average: 0.03, 0.04, 0.05 CPU Intel i5 CPU M520@2.40GHz | Intel Arrandale GPU ---
**Author:** ![lash04](https://avatars.discourse-cdn.com/v4/letter/l/dc4da7/32.png) [@lash04](https://forums.suse.com/u/lash04)\ **Post date:** [October 16, 2012, 7:49pm UTC](https://forums.suse.com/t/kernel-error-dwarf2-unwinder-stuck-at-system-call/23207/3 "2012-10-16T19:49:00Z")
Hi Malcolm, Thanks for your early response on this matter. I will raise an SR to this. ---
**Author:** ![malcolmlewis](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/malcolmlewis/32/11375_2.png) [@malcolmlewis](https://forums.suse.com/u/malcolmlewis)\ **Post date:** [October 16, 2012, 8:55pm UTC](https://forums.suse.com/t/kernel-error-dwarf2-unwinder-stuck-at-system-call/23207/4 "2012-10-16T20:55:50Z")
> [@lash04](#): > > Hi Malcolm, > > Thanks for your early response on this matter. I will raise an SR to > this. Hi Excellent 🙂 If you have any issues with the SR, please post back details in the thread. – Cheers Malcolm °¿° (Linux Counter #276890) openSUSE 12.2 (x86\_64) Kernel 3.4.11-2.16-desktop up 22:18, 4 users, load average: 0.11, 0.07, 0.06 CPU Intel i5 CPU M520@2.40GHz | Intel Arrandale GPU ---
**Author:** ![lash04](https://avatars.discourse-cdn.com/v4/letter/l/dc4da7/32.png) [@lash04](https://forums.suse.com/u/lash04)\ **Post date:** [October 18, 2012, 8:24am UTC](https://forums.suse.com/t/kernel-error-dwarf2-unwinder-stuck-at-system-call/23207/5 "2012-10-18T08:24:15Z")
Hi Malcolm, Just now i was able to raise the SR to Novell. Thank you for your assistance on this matter. I will post back 🙂 ---
**Author:** ![ashbyj](https://avatars.discourse-cdn.com/v4/letter/a/258eb7/32.png) [@ashbyj](https://forums.suse.com/u/ashbyj)\ **Post date:** [October 29, 2012, 7:58pm UTC](https://forums.suse.com/t/kernel-error-dwarf2-unwinder-stuck-at-system-call/23207/6 "2012-10-29T19:58:15Z")
[QUOTE=lash04;9562]Hi Malcolm, Just now i was able to raise the SR to Novell. Thank you for your assistance on this matter. I will post back :)[/QUOTE] Hi lash04, Any word back on this? This issue pops up on multiple SLES 11 SP2 servers in our environment. From what I understand, it means the kernel is ‘tainted’. [This article](http://www.novell.com/support/kb/doc.php?id=3582750) gives more info on what that means and how to decode the Taint flags. However, the flags and the logs themselves fail to give me further info on what is actually causing the taint. Could be a hardware issue or perhaps a driver/module issue. ---
**Author:** ![lash04](https://avatars.discourse-cdn.com/v4/letter/l/dc4da7/32.png) [@lash04](https://forums.suse.com/u/lash04)\ **Post date:** [October 30, 2012, 7:42am UTC](https://forums.suse.com/t/kernel-error-dwarf2-unwinder-stuck-at-system-call/23207/7 "2012-10-30T07:42:12Z")
Hi Ashby, Yes got a reply from Novell. There is a new Maintenance-Kernel update release.You can apply that and they said these messages means no harm. In the meanwhile, please check whether you have done any firmware updates coz that can bring these issues too. ---
**Author:** ![ashbyj](https://avatars.discourse-cdn.com/v4/letter/a/258eb7/32.png) [@ashbyj](https://forums.suse.com/u/ashbyj)\ **Post date:** [October 30, 2012, 2:55pm UTC](https://forums.suse.com/t/kernel-error-dwarf2-unwinder-stuck-at-system-call/23207/8 "2012-10-30T14:55:35Z")
[QUOTE=lash04;9825]Hi Ashby, Yes got a reply from Novell. There is a new Maintenance-Kernel update release.You can apply that and they said these messages means no harm. In the meanwhile, please check whether you have done any firmware updates coz that can bring these issues too.[/QUOTE] Good to hear. Do you know which patch # that is? Or the date that patch was released?