Stack Dump in Syslog?

[Gordan Bobic]

I get this in the syslog as soon as ZFS starts:

Mar 16 20:26:10 zeus kernel: sda: sda1 sda9
Mar 16 20:26:10 zeus kernel: sdb: sdb1 sdb9
Mar 16 20:26:10 zeus kernel: sdc: sdc1 sdc9
Mar 16 20:26:10 zeus kernel: sdd: sdd1 sdd9
Mar 16 20:26:11 zeus kernel: sde: sde1 sde9
Mar 16 20:26:11 zeus kernel: checking : this : super_block magic no :
2fc12fc1
Mar 16 20:52:11 zeus kernel: SPL: Showing stack for process 3212
Mar 16 20:52:11 zeus kernel: Pid: 3212, comm: txg_sync Tainted:
P ---------------- 2.6.32-71.18.2.el6.x86_64 #1
Mar 16 20:52:11 zeus kernel: Call Trace:
Mar 16 20:52:11 zeus kernel: [<ffffffffa02dc5c7>] spl_debug_dumpstack
+0x27/0x40 [spl]
Mar 16 20:52:11 zeus kernel: [<ffffffffa02e08ad>] kmem_alloc_debug
+0x11d/0x130 [spl]
Mar 16 20:52:11 zeus kernel: [<ffffffffa03ee041>] dsl_scan_setup_sync
+0x1e1/0x210 [zfs]
Mar 16 20:52:11 zeus kernel: [<ffffffffa03f122b>]
dsl_sync_task_group_sync+0x12b/0x220 [zfs]
Mar 16 20:52:11 zeus kernel: [<ffffffffa03ea28b>] dsl_pool_sync+0x1eb/
0x480 [zfs]
Mar 16 20:52:11 zeus kernel: [<ffffffffa03fbbe7>] spa_sync+0x397/0x9a0
[zfs]
Mar 16 20:52:11 zeus kernel: [<ffffffff81091e06>] ?
autoremove_wake_function+0x16/0x40
Mar 16 20:52:11 zeus kernel: [<ffffffff810500a9>] ? __wake_up_common
+0x59/0x90
Mar 16 20:52:11 zeus kernel: [<ffffffff810563b3>] ? __wake_up
+0x53/0x70
Mar 16 20:52:11 zeus kernel: [<ffffffffa040d025>] txg_sync_thread
+0x215/0x3a0 [zfs]
Mar 16 20:52:11 zeus kernel: [<ffffffffa040ce10>] ? txg_sync_thread
+0x0/0x3a0 [zfs]
Mar 16 20:52:11 zeus kernel: [<ffffffffa040ce10>] ? txg_sync_thread
+0x0/0x3a0 [zfs]
Mar 16 20:52:11 zeus kernel: [<ffffffffa02e1318>]
thread_generic_wrapper+0x68/0x80 [spl]
Mar 16 20:52:11 zeus kernel: [<ffffffffa02e12b0>] ?
thread_generic_wrapper+0x0/0x80 [spl]
Mar 16 20:52:11 zeus kernel: [<ffffffff81091a86>] kthread+0x96/0xa0
Mar 16 20:52:11 zeus kernel: [<ffffffff810141ca>] child_rip+0xa/0x20
Mar 16 20:52:11 zeus kernel: [<ffffffff810919f0>] ? kthread+0x0/0xa0
Mar 16 20:52:11 zeus kernel: [<ffffffff810141c0>] ? child_rip+0x0/0x20
Mar 16 20:52:27 zeus kernel: checking : this : super_block magic no :
2fc12fc1

Is this just debug info being dumped or is this indicative of an
actual failure? I don't see an associated oops and I haven't observed
any obvious problems arising from this.

Gordan

[Prasad Joshi]

Yes you are correct this is just the debug log, nothing has went wrong. You might have been using the debug version of the ZFS.

Thanks and Regards,

Prasad

 

Gordan