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

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

#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?)
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640 (c)     E-Mail: l...@lerctr.org
US Mail: 108 Turvey Cove, Hutto, TX 78634-5688
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