[rhelv6-list] RHEL6.2 Kernel/EXT4 bug

[Brian Long]

On 1/12/12 12:14 PM, Musayev, Ilya wrote:
> Curious if anyone has seen this in their RHEL6.2 setups, if you have 6.1
> or 6.2 please try this out and see what happens. List of commands to
> reproduce is below, latest iozone required.
> 
>  
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=773377

I put the same kernel on my RH 6.2 workstation with a single drive and
ran iozone with the same parameters.  I don't have the drive mirrored
and I had to change the scheduler to noop since it was cfq by default.

The only partition I had with enough free space is encrypted, so kcryptd
was taking 100% CPU while running iozone.  Have you narrowed it down to
md-only?  What happens if you run the same test on just one of your drives?

I got a kernel oops early on, but no ext4 errors:
Jan 12 12:51:26 brilong-lnx2 kernel: ------------[ cut here ]------------
Jan 12 12:51:26 brilong-lnx2 kernel: WARNING: at kernel/sched.c:5914
thread_return+0x232/0x79d() (Not tainted)
Jan 12 12:51:26 brilong-lnx2 kernel: Hardware name: IBM System x3200
-[4362PAY]-
Jan 12 12:51:26 brilong-lnx2 kernel: Modules linked in: autofs4 sunrpc
cpufreq_ondemand acpi_cpufreq freq_table mperf ipv6 ipt_REJECT
nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter
ip_tables sha256_generic cryptd aes_x86_64 aes_generic cbc dm_crypt
uinput sg microcode serio_raw i2c_i801 iTCO_wdt iTCO_vendor_support tg3
i3000_edac edac_core ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom
pata_acpi ata_generic ata_piix radeon ttm drm_kms_helper drm
i2c_algo_bit i2c_core dm_mirror dm_region_hash dm_log dm_mod [last
unloaded: scsi_wait_scan]
Jan 12 12:51:26 brilong-lnx2 kernel: Pid: 23, comm: kblockd/1 Not
tainted 2.6.32-220.2.1.el6.x86_64 #1
Jan 12 12:51:26 brilong-lnx2 kernel: Call Trace:
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff81069997>] ?
warn_slowpath_common+0x87/0xc0
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff810699ea>] ?
warn_slowpath_null+0x1a/0x20
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff814eccc5>] ?
thread_return+0x232/0x79d
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff812494d0>] ?
blk_unplug_work+0x0/0x70
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff812494d0>] ?
blk_unplug_work+0x0/0x70
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff8108b15c>] ?
worker_thread+0x1fc/0x2a0
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff81090a10>] ?
autoremove_wake_function+0x0/0x40
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff8108af60>] ?
worker_thread+0x0/0x2a0
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff810906a6>] ?
kthread+0x96/0xa0
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff8100c14a>] ?
child_rip+0xa/0x20
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff81090610>] ? kthread+0x0/0xa0
Jan 12 12:51:26 brilong-lnx2 kernel: [<ffffffff8100c140>] ?
child_rip+0x0/0x20
Jan 12 12:51:26 brilong-lnx2 kernel: ---[ end trace aeef27db2e12775f ]---

/Brian/
-- 
       Brian Long                             |       |
       Corporate Security Programs Org    . | | | . | | | .
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