panic: System call lstat returning with 1 locks held

Yar Tikhiy yar at comp.chem.msu.su
Fri Feb 1 06:50:56 PST 2008


On Fri, Feb 01, 2008 at 12:41:30AM -0600, Scot Hetzel wrote:
> On 1/31/08, Attilio Rao <attilio at freebsd.org> wrote:
> > 2008/1/31, Yar Tikhiy <yar at comp.chem.msu.su>:
> >
> > > On Thu, Jan 31, 2008 at 11:43:10AM +0100, Attilio Rao wrote:
> >  >  >
> >  >  > The assertion failing should not happen now.
> >  >  > Could you please hand-add a check in _lockmgr_disown()
> >  >  > (kern/kern_lock.c) in order to check for the panicstr before to call
> >  >  > WITNESS? I cannot access to perforce now and produce a suitable diff,
> >  >  > so you can just do this by hand:
> >  >  >
> >  >  > if (lkp->lk_lockholder == td) {
> >  >  >         if (panicstr != NULL)
> >  >  >                 WITNESS_UNLOCK(&lkp->lk_object, LOP_EXCLUSIVE, file, line);
> >  >  >         td->td_locks--;
> >  >  > }
> >  >
> >  >
> >  > Shouldn't the test for panicstr be inverse: `panicstr == NULL'?
> >  >  I guess we shouldn't call WITNESS when panicing, should we?
> >  >  Sorry if I got it wrong.
> >
> >
> > Weee, you are right, sorry!
> >
> >
> I added this change to kern/kern_lock.c, but I'm still getting this
> panic after mounting the ntfs filesystem, and using cvsup to update
> the local mirror:
> 
> Fatal trap 9: general protection fault while in kernel mode
> cpuid = 0; apic id = 00
> instruction pointer     = 0x8:0xffffffff80301051
> stack pointer           = 0x10:0xffffffffd43b9100
> frame pointer           = 0x10:0xffffffffd43b9190
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                         = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags        = resume, IOPL = 0
> current process         = 1229 (cvsup)
> panic: Assertion !mtx_owned(&w_mtx) failed at ../../../kern/subr_witness.c:959
> cpuid = 0
> Uptime: 4m38s
> Physical memory: 2031 MB
> Dumping 324 MB: 309 293 277 261 245 229 213 197 181 165 149 133 117
> 101 85 69 53 37 21 5

FWIW, the same panic happens in my case, too.  In addition, reported
are a number of LORs I haven't seen before.  The relevant kernel
message log from the serial console is attached.  Thanks!

-- 
Yar

[...]
WARNING: WITNESS option enabled, expect reduced performance.
GEOM_LABEL: Label for provider ad0s1 is ntfs/SYSTEM.
GEOM_LABEL: Label for provider ad0s2 is ntfs/STORE.
lock order reversal:
 1st 0xc2ecfe28 devfs (devfs) @ /usr/src/sys/kern/vfs_subr.c:2061
 2nd 0xc2fbead4 devfsmount (devfsmount) @ /usr/src/sys/fs/devfs/devfs_vnops.c:20
1
KDB: stack backtrace:
db_trace_self_wrapper(c0b0fa49,d3cecbbc,c07a2c5e,c0b11f90,c2fbead4,...) at db_tr
ace_self_wrapper+0x26
kdb_backtrace(c0b11f90,c2fbead4,c0b0343a,c0b0343a,c0b0347b,...) at kdb_backtrace
+0x29
witness_checkorder(c2fbead4,9,c0b0347b,c9,c7,...) at witness_checkorder+0x6de
_sx_xlock(c2fbead4,0,c0b0347b,c9,c2fbead4,...) at _sx_xlock+0x7d
devfs_allocv(c2fbd700,c2fc3000,d3cecc28,c2d0fcc0,c0b17d73,...) at devfs_allocv+0
x144
devfs_root(c2fc3000,2,c0e1c118,c2d0fcc0,ca,...) at devfs_root+0x51
set_rootvnode(c0e1c100,0,c0b17d73,5ed,c07e0150,...) at set_rootvnode+0x2b
vfs_mountroot(c0dc9d50,4,c0b078ec,260,0,...) at vfs_mountroot+0x356
start_init(0,d3cecd38,c0b091cd,30c,c2d0dab0,...) at start_init+0x65
fork_exit(c0732530,0,d3cecd38) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xd3cecd70, ebp = 0 ---
Trying to mount root from ufs:/dev/ad0s3a
WARNING: / was not properly dismounted
lock order reversal:
 1st 0xc2ecf9e8 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2061
 2nd 0xc2fc3000 vfslock (vfslock) @ /usr/src/sys/kern/vfs_subr.c:364
KDB: stack backtrace:
db_trace_self_wrapper(c0b0fa49,d3cec9e0,c07a2c5e,c0b11f90,c2fc3000,...) at db_tr
ace_self_wrapper+0x26
kdb_backtrace(c0b11f90,c2fc3000,c0b17e71,c0b17e71,c0b1840e,...) at kdb_backtrace
+0x29
witness_checkorder(c2fc3000,1,c0b1840e,16c,151,...) at witness_checkorder+0x6de
_lockmgr(c2fc3000,2001,c2fc3030,c0b1840e,16c,...) at _lockmgr+0x174
vfs_busy(c2fc3000,0,0,c2d0fcc0,d3cecb58,...) at vfs_busy+0x198
lookup(d3cecb44,c0b17b21,c6,bf,c2ce142c,...) at lookup+0x7c4
namei(d3cecb44,c2d0fd54,c0bc54a4,c0b17d73,c2fc3030,...) at namei+0x34b
kern_unlink(c2d0fcc0,c0b181b0,1,628,0,...) at kern_unlink+0x40
vfs_mountroot_try(c0b1836a,c0b0660d,c0aff4ee,1,c07e0150,...) at vfs_mountroot_tr
y+0x470
vfs_mountroot(c0dc9d50,4,c0b078ec,260,0,...) at vfs_mountroot+0x418
start_init(0,d3cecd38,c0b091cd,30c,c2d0dab0,...) at start_init+0x65
fork_exit(c0732530,0,d3cecd38) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xd3cecd70, ebp = 0 ---
lock order reversal:
 1st 0xc2d13044 user map (user map) @ /usr/src/sys/vm/vm_map.c:3111
 2nd 0xc2ecf7c8 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2061
KDB: stack backtrace:
db_trace_self_wrapper(c0b0fa49,d3cec9cc,c07a2c5e,c0b11f90,c2ecf7c8,...) at db_tr
ace_self_wrapper+0x26
kdb_backtrace(c0b11f90,c2ecf7c8,c0b06ec0,c0b06ec0,c0b1840e,...) at kdb_backtrace
+0x29
witness_checkorder(c2ecf7c8,1,c0b1840e,80d,c0dd52f4,...) at witness_checkorder+0
x6de
_lockmgr(c2ecf7c8,3041,c2ecf7f8,c0b1840e,80d,...) at _lockmgr+0x174
ffs_lock(d3ceca78,c075b6bd,c0dd52f4,3041,c2ecf770,...) at ffs_lock+0x8a
VOP_LOCK1_APV(c0bdfbc0,d3ceca78,c0b0660b,3,c2ecf7f8,...) at VOP_LOCK1_APV+0xa5
_vn_lock(c2ecf770,3041,c0b1840e,80d,0,...) at _vn_lock+0xf2
vget(c2ecf770,3041,c2d0fcc0,4a9,c1460600,...) at vget+0x109
vnode_pager_lock(c1460480,0,c0b2ec90,127,d3cecbe8,...) at vnode_pager_lock+0x1ad
vm_fault(c2d13000,80d2000,2,8,80d2000,...) at vm_fault+0x1df
trap_pfault(5,0,c0b3ce02,2c8,c2d0dab0,...) at trap_pfault+0x118
trap(d3cecd38) at trap+0x267
calltrap() at calltrap+0x6
--- trap 0xc, eip = 0x80480e5, esp = 0xbfbfeef0, ebp = 0xbfbfef10 ---
Enter full pathname of shell or RETURN for /bin/sh:
#
# mount -r /usr
# mount -r /var
# mount /ntfs
#
# umount /ntfs
lock order reversal:
 1st 0xc2fece28 ntfs (ntfs) @ /usr/src/sys/kern/vfs_subr.c:2361
 2nd 0xc2fbbe24 ntnode (ntnode) @ /usr/src/sys/modules/ntfs/../../fs/ntfs/ntfs_s
ubr.c:361
KDB: stack backtrace:
db_trace_self_wrapper(c0b0fa49,d614ea38,c07a2c5e,c0b11f90,c2fbbe24,...) at db_tr
ace_self_wrapper+0x26
kdb_backtrace(c0b11f90,c2fbbe24,c301f540,c301f540,c301f6aa,...) at kdb_backtrace
+0x29
witness_checkorder(c2fbbe24,9,c301f6aa,169,167,...) at witness_checkorder+0x6de
_lockmgr(c2fbbe24,2002,c2fbbe54,c301f6aa,169,...) at _lockmgr+0x448
ntfs_ntget(c2fbbe00,c3020320,d614eab4,c2fbbe00,c3020320,...) at ntfs_ntget+0x5d
ntfs_reclaim(d614eb04,c0b3ef3d,0,c2fecdd0,c3021aa0,...) at ntfs_reclaim+0x3b
VOP_RECLAIM_APV(c3020320,d614eb04,c3021aa0,0,0,...) at VOP_RECLAIM_APV+0xc5
vgonel(c2fece58,0,c0b1840e,95b,1,...) at vgonel+0x1cf
vflush(c2fc2538,0,1,c3021aa0,c0e1bfe0,...) at vflush+0x367
ntfs_unmount(c2fc2538,8000000,c3021aa0,4f0,4da,...) at ntfs_unmount+0x4f
dounmount(c2fc2538,8000000,c3021aa0,482,8,...) at dounmount+0x426
unmount(c3021aa0,d614ecfc,8,d614ed38,c0bbeef0,...) at unmount+0x2e0
syscall(d614ed38) at syscall+0x2b3
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (22, FreeBSD ELF32, unmount), eip = 0x280c62db, esp = 0xbfbfe6ac, eb
p = 0xbfbfe768 ---
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0xdeadc0ee
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc07a0676
stack pointer           = 0x28:0xd614e9a0
frame pointer           = 0x28:0xd614e9a4
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = resume, IOPL = 0
current process         = 43 (umount)
[thread pid 43 tid 100052 ]
Stopped at      isitmychild+0x6:        movl    0x10(%eax),%ecx
db> panic: Assertion !mtx_owned(&w_mtx) failed at /usr/src/sys/kern/subr_witness
.c:959
cpuid = 0
Uptime: 2m14s
Cannot dump. No dump device defined.
Automatic reboot in 15 seconds - press a key on the console to abort


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