zfs i/o hangs on 9-PRERELEASE

Pawel Jakub Dawidek pjd at FreeBSD.org
Mon Nov 28 14:19:29 UTC 2011

On Fri, Nov 25, 2011 at 01:20:01PM -0600, Mark Felder wrote:
> 13:14:32 nas:~ > uname -a
> FreeBSD nas.feld.me 9.0-PRERELEASE FreeBSD 9.0-PRERELEASE #3 r227971M: 
> Fri Nov 25 10:07:48 CST 2011     
> root at nas.feld.me:/usr/obj/tank/svn/sys/GENERIC  amd64
> This seemed to start happening sometime after RC1. I tried 8-STABLE and 
> it's happening there too right now. I think whatever caused this was 
> MFC'd. I've also reproduced this on completely different hardware 
> running a single disk ZFS pool.
> I'm getting this output in dmesg after these hangs I keep seeing.

Mark, those backtrace are not related to ZFS, but to PF. Not sure if
they are at all related to your hangs. Most cases where ZFS I/O seems to
hang are hardware problems, where I/O requests are not completed.

'procstat -kk -a' output might be useful once the hang happens.

> uma_zalloc_arg: zone "pfrktable" with the following non-sleepable locks 
> held:
> exclusive sleep mutex pf task mtx (pf task mtx) r = 0 
> (0xffffffff8199af20) locked @ 
> /tank/svn/sys/modules/pf/../../contrib/pf/net/pf_ioctl.c:1589
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
> kdb_backtrace() at kdb_backtrace+0x37
> _witness_debugger() at _witness_debugger+0x2e
> witness_warn() at witness_warn+0x2c4
> uma_zalloc_arg() at uma_zalloc_arg+0x335
> pfr_create_ktable() at pfr_create_ktable+0xd8
> pfr_ina_define() at pfr_ina_define+0x12b
> pfioctl() at pfioctl+0x1c5a
> devfs_ioctl_f() at devfs_ioctl_f+0x7a
> kern_ioctl() at kern_ioctl+0xcd
> sys_ioctl() at sys_ioctl+0xfd
> amd64_syscall() at amd64_syscall+0x3ac
> Xfast_syscall() at Xfast_syscall+0xf7
> --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x800da711c, rsp = 
> 0x7fffffff9d28, rbp = 0x7fffffffa1f0 ---

Pawel Jakub Dawidek                       http://www.wheelsystems.com
FreeBSD committer                         http://www.FreeBSD.org
Am I Evil? Yes, I Am!                     http://yomoli.com
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