how to debug hang during boot

Colin Law clanlaw at gmail.com
Tue Jul 19 09:25:23 UTC 2016


On 19 July 2016 at 10:16, John Keenleyside <keenley at ca.ibm.com> wrote:
> One of our systems running Ubuntu 16.04 crashed yesterday. Upon reboot, the
> system hung for almost 7 hours with no messages being written to the
> console. This has happened before on other similar systems so we know it is
> reproducible. How should we debug what is causing this hang?

Odd that you have seen this on multiple systems, I have never seen such a thing.
What happened after it hung for 7 hours?  Did it then startup or did
you force a restart or what?  If you forced a restart did it startup
ok?

Has the machine got a GUI or is it a server?

Colin

>
>
> Jul 19 01:45:45 h0102-u06 kernel: [   56.239197] i40e 0000:82:00.2 privateb:
> NIC Link is Up 10 Gbps Full Duplex, Flow Control: None
> Jul 19 01:45:45 h0102-u06 kernel: [   56.365352] i40e 0000:82:00.0 privatea:
> NIC Link is Up 10 Gbps Full Duplex, Flow Control: None
> Jul 19 01:45:45 h0102-u06 kernel: [   56.713780] ixgbe 0000:01:00.1:
> registered PHC device on eth1
> Jul 19 01:45:45 h0102-u06 kernel: [   56.903792] IPv6: ADDRCONF(NETDEV_UP):
> eth1: link is not ready
> Jul 19 01:45:45 h0102-u06 kernel: [   57.204518] ixgbe 0000:01:00.0:
> registered PHC device on eth0
> Jul 19 01:45:45 h0102-u06 kernel: [   57.375950] IPv6: ADDRCONF(NETDEV_UP):
> eth0: link is not ready
> Jul 19 01:45:45 h0102-u06 kernel: [   57.464465] i40e 0000:82:00.3 publicb:
> NIC Link is Up 10 Gbps Full Duplex, Flow Control: None
> Jul 19 01:45:45 h0102-u06 kernel: [   57.600445] i40e 0000:82:00.1 publica:
> NIC Link is Up 10 Gbps Full Duplex, Flow Control: None
> Jul 19 01:45:45 h0102-u06 kernel: [   58.715665] random: nonblocking pool is
> initialized
> Jul 19 01:45:45 h0102-u06 kernel: [24680.790317] EXT4-fs (sdb1): INFO:
> recovery required on readonly filesystem
> Jul 19 01:45:45 h0102-u06 kernel: [24680.889005] EXT4-fs (sdb1): write
> access will be enabled during recovery
> Jul 19 01:45:45 h0102-u06 kernel: [24681.006377] EXT4-fs (sdb1): orphan
> cleanup on readonly fs
> Jul 19 01:45:45 h0102-u06 kernel: [24681.088730] EXT4-fs (sdb1): 10 orphan
> inodes deleted
> Jul 19 01:45:45 h0102-u06 kernel: [24681.159735] EXT4-fs (sdb1): recovery
> complete
> Jul 19 01:45:45 h0102-u06 kernel: [24681.240284] EXT4-fs (sdb1): mounted
> filesystem with ordered data mode. Opts: (null)
>
> Thank you,
> John Keenleyside
>
>
>
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