r273165. ZFS ARC: possible memory leak to Inact

[Andriy Gapon]

On 05/11/2014 18:32, James R. Van Artsdalen wrote:
> On 11/5/2014 6:41 AM, Andriy Gapon wrote:
>> If something hangs (appears to hang) and it's ZFS related, then
>> https://wiki.freebsd.org/AvgZfsDeadlockDebug
>>
> 
> I don't think the"zpool history" hang is in ZFS or storage layer code:
> it seems be  stalled in kernel malloc().   See PID 12105 (zpool 
> history) below.

The wiki page has this underscored line :-)

when reporting a problem please always include full information about thread
stacks, don't cherry pick; the output can be large, upload it somewhere and post
a link

> SUPERTEX:/root# uname -a
> FreeBSD SUPERTEX.housenet.jrv 10.1-PRERELEASE FreeBSD 10.1-PRERELEASE #3
> r273476M: Wed Oct 22 15:05:29 CDT 2014    
> root at SUPERTEX.housenet.jrv:/usr/obj/usr/src/sys/GENERIC  amd64
> SUPERTEX:/root# procstat -kk -a > kk
> SUPERTEX:/root# grep zio_wait kk
> SUPERTEX:/root# grep zio_done kk
> SUPERTEX:/root# grep zio_int kk
> SUPERTEX:/root# grep zfs_ kk
>     0 100475 kernel           zfs_vn_rele_task mi_switch+0xe1
> sleepq_wait+0x3a _sleep+0x287 taskqueue_thread_loop+0xd5 fork_exit+0x9a
> fork_trampoline+0xe
>     0 101018 kernel           zfs_vn_rele_task mi_switch+0xe1
> sleepq_wait+0x3a _sleep+0x287 taskqueue_thread_loop+0xd5 fork_exit+0x9a
> fork_trampoline+0xe
>     0 101522 kernel           zfs_vn_rele_task mi_switch+0xe1
> sleepq_wait+0x3a _sleep+0x287 taskqueue_thread_loop+0xd5 fork_exit+0x9a
> fork_trampoline+0xe
> 12105 101599 zpool            -                mi_switch+0xe1
> sleepq_wait+0x3a _cv_wait+0x16d vmem_xalloc+0x568 vmem_alloc+0x3d
> kmem_malloc+0x33 uma_large_malloc+0x49 malloc+0x43
> zfs_ioc_pool_get_history+0xbd zfsdev_ioctl+0x5ca devfs_ioctl_f+0x139
> kern_ioctl+0x255 sys_ioctl+0x13c amd64_syscall+0x351 Xfast_syscall+0xfb
> SUPERTEX:/root# grep dmu_ kk
> SUPERTEX:/root# grep arc_ kk
>     3 100125 zfskern          arc_reclaim_thre mi_switch+0xe1
> sleepq_timedwait+0x3a _cv_timedwait_sbt+0x18b arc_reclaim_thread+0x288
> fork_exit+0x9a fork_trampoline+0xe
>     3 100126 zfskern          l2arc_feed_threa mi_switch+0xe1
> sleepq_timedwait+0x3a _cv_timedwait_sbt+0x18b l2arc_feed_thread+0x19f
> fork_exit+0x9a fork_trampoline+0xe
> SUPERTEX:/root# grep buf_ kk
>    20 100139 bufdaemon        -                mi_switch+0xe1
> sleepq_timedwait+0x3a _sleep+0x26e buf_daemon+0x78 fork_exit+0x9a
> fork_trampoline+0xe
> SUPERTEX:/root# ps lp 12105
> UID   PID  PPID CPU PRI NI    VSZ   RSS MWCHAN   STAT TT     TIME COMMAND
>   0 12105 12104   0  20  0 105692 35984 kmem are D     -  0:03.76 zpool
> history BI
> SUPERTEX:/root#
> 
> 


-- 
Andriy Gapon