On 8/19/2014 8:53 AM, Larry Rosenman wrote:
> On 2014-08-19 08:42, Eric van Gyzen wrote:
>> On 08/18/2014 16:45, Ryan Stone wrote:
>>> The first thing that I'd like to see is (in kgdb):
>>>
>>> set $td=(struct thread)0xfffff8002abeb000
>>> tid $td->td_tid
>>> bt
>>>
>>> That will show us the backtrace of the thread that was blocked for so
>>> long.
>>
>> Make that:
>>
>> set $td=(struct thread *)0xfffff8002abeb000
>> tid $td->td_tid
>> bt
>>
>>
>> Eric
> #0  doadump (textdump=1) at pcpu.h:219
> 219    pcpu.h: No such file or directory.
>     in pcpu.h
> (kgdb) set $td=(struct thread *)0xfffff8002abeb000
> Current language:  auto; currently minimal
> (kgdb) tid $td->td_tid
> [Switching to thread 469 (Thread 100681)]#0  sched_switch (
>     td=0xfffff8002abeb000, newtd=<value optimized out>,
>     flags=<value optimized out>) at /usr/src/sys/kern/sched_ule.c:1931
> 1931            cpuid = PCPU_GET(cpuid);
> (kgdb) bt
> #0  sched_switch (td=0xfffff8002abeb000, newtd=<value optimized out>,
>     flags=<value optimized out>) at /usr/src/sys/kern/sched_ule.c:1931
> #1  0xffffffff80a107d9 in mi_switch (flags=260, newtd=0x0)
>     at /usr/src/sys/kern/kern_synch.c:493
> #2  0xffffffff80a4c442 in sleepq_switch (wchan=<value optimized out>,
>     pri=<value optimized out>) at /usr/src/sys/kern/subr_sleepqueue.c:552
> #3  0xffffffff80a4c2a3 in sleepq_wait (wchan=0xfffff80070a4dd50, pri=96)
>     at /usr/src/sys/kern/subr_sleepqueue.c:631
> #4  0xffffffff809eb1fa in sleeplk (lk=<value optimized out>,
>     flags=<value optimized out>, ilk=<value optimized out>,
>     wmesg=<value optimized out>, pri=<value optimized out>,
>     timo=<value optimized out>) at /usr/src/sys/kern/kern_lock.c:225
> #5  0xffffffff809eaa06 in __lockmgr_args (lk=0xfffff80070a4dd50,
>     flags=<value optimized out>, ilk=0xfffff80070a4dd80,
>     wmesg=<value optimized out>, pri=<value optimized out>,
>     timo=<value optimized out>) at /usr/src/sys/kern/kern_lock.c:931
> #6  0xffffffff8092e092 in nfs_lock1 (ap=<value optimized out>) at
> lockmgr.h:97
> #7  0xffffffff80f2d57c in VOP_LOCK1_APV (vop=<value optimized out>,
>     a=<value optimized out>) at vnode_if.c:2082
> #8  0xffffffff80abd22a in _vn_lock (vp=0xfffff80070a4dce8,
>     flags=<value optimized out>,
>     file=0xffffffff8110db88 "/usr/src/sys/kern/vfs_subr.c", line=2137)
>     at vnode_if.h:859
> #9  0xffffffff80aad4e7 in vget (vp=0xfffff80070a4dce8, flags=524544,
> ---Type <return> to continue, or q <return> to quit---
>     td=0xfffff8002abeb000) at /usr/src/sys/kern/vfs_subr.c:2137
> #10 0xffffffff80aa1491 in vfs_hash_get (mp=0xfffff8002aa1e990,
>     hash=1741450670, flags=<value optimized out>, td=0xfffff8002abeb000,
>     vpp=0xfffffe100c75c670, fn=0xffffffff80935820 <newnfs_vncmpf>)
>     at /usr/src/sys/kern/vfs_hash.c:88
> #11 0xffffffff809314bd in ncl_nget (mntp=0xfffff8002aa1e990,
>     fhp=0xfffff80070ccf4a4 "\001", fhsize=12, npp=0xfffffe100c75c6e0,
>     lkflags=<value optimized out>)
>     at /usr/src/sys/fs/nfsclient/nfs_clnode.c:114
> #12 0xffffffff809340fd in nfs_statfs (mp=0xfffff8002aa1e990,
>     sbp=0xfffff8002aa1ea48) at /usr/src/sys/fs/nfsclient/nfs_clvfsops.c:288
> #13 0xffffffff80aa7ade in __vfs_statfs (mp=0x0, sbp=0xfffff8002aa1ea48)
>     at /usr/src/sys/kern/vfs_mount.c:1706
> #14 0xffffffff80ab4f5e in kern_getfsstat (td=0xfffff8002abeb000,
>     buf=<value optimized out>, bufsize=<value optimized out>,
>     bufseg=UIO_USERSPACE, flags=<value optimized out>)
>     at /usr/src/sys/kern/vfs_syscalls.c:511
> #15 0xffffffff80e1625a in amd64_syscall (td=0xfffff8002abeb000, traced=0)
>     at subr_syscall.c:133
> #16 0xffffffff80df760b in Xfast_syscall ()
>     at /usr/src/sys/amd64/amd64/exception.S:390
> #17 0x00000008010fc83a in ?? ()
> Previous frame inner to this frame (corrupt stack?)
> (kgdb)

Looks like the one I hit recently as well:

http://lists.freebsd.org/pipermail/freebsd-fs/2014-July/019843.html

This lock should probably be excluded from the DEADLKRES.

I have not had time to follow-up on it, but it's a trivial thing to add
it to the list.

-- 
Regards,
Bryan Drewery

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