Date: Tue, 19 Aug 2014 08:53:52 -0500 From: Larry Rosenman <ler@lerctr.org> To: Eric van Gyzen <eric@vangyzen.net> Cc: FreeBSD Current <freebsd-current@freebsd.org>, Ryan Stone <rysto32@gmail.com> Subject: Re: DEADLKRES crash Message-ID: <d12664f386560280c33894cddc68dcf0@thebighonker.lerctr.org> In-Reply-To: <53F35449.9050608@vangyzen.net> References: <20140818152138.GA3481@borg.lerctr.org> <CAFMmRNyabSni_X_YM2qpJAPi3Gc4WrihVo-LJ6RH8BJMbGWb_g@mail.gmail.com> <53F35449.9050608@vangyzen.net>
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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)
--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 214-642-9640 (c) E-Mail: ler@lerctr.org
US Mail: 108 Turvey Cove, Hutto, TX 78634-5688
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