Advisory lock crashes.

[Konstantin Belousov]

On Mon, Feb 18, 2013 at 11:08:34PM -0800, Alfred Perlstein wrote:
> Hello Konstantin & Doug,
> 
> We're getting a few crashes in what looks to be kern_lockf.c:
> 
> fault address here is 0x360 which appears to mean that the "sx" owner 
> thread is NULL
What is the version of FreeBSD ?
What is the filesystem owning the file which was advlocked ?
Show the line number for lf_advlockasync+0x5d7.

No, I never saw nothing similar in last 3 years.
> 
> db>  bt
> Tracing pid 5099 tid 101614 td 0xfffffe005d54e8c0
> _sx_xlock_hard() at _sx_xlock_hard+0xb3
> lf_advlockasync() at lf_advlockasync+0x5d7
> lf_advlock() at lf_advlock+0x47
> vop_stdadvlock() at vop_stdadvlock+0xb3
> VOP_ADVLOCK_APV() at VOP_ADVLOCK_APV+0x4a
> closef() at closef+0x352
> kern_close() at kern_close+0x172
> amd64_syscall() at amd64_syscall+0x58a
> Xfast_syscall() at Xfast_syscall+0xf7
> --- syscall (6, FreeBSD ELF64, sys_close), rip = 0x8011651fc, rsp = 0x7fffffbfdd58, rbp = 0x807c3d6c0 ---
> 
> (kgdb) list *(_sx_xlock_hard+0xb3)
> 0xffffffff806242c3 is in _sx_xlock_hard 
> (/usr/home/jpaetzel/9.0.6-RELEASE-p1/FreeBSD/src/sys/kern/kern_sx.c:514).
> 509                     x = sx->sx_lock;
> 510                     if ((sx->lock_object.lo_flags & SX_NOADAPTIVE) 
> == 0) {
> 511                             if ((x & SX_LOCK_SHARED) == 0) {
> 512                                     x = SX_OWNER(x);
> 513                                     owner = (struct thread *)x;
> 514                                     if (TD_IS_RUNNING(owner)) {
> 515                                             if 
> (LOCK_LOG_TEST(&sx->lock_object, 0))
> 516 CTR3(KTR_LOCK,
> 517                                                 "%s: spinning on %p 
> held by %p",
> 518 __func__, sx, owner);
> 
> 
> Another panic here, which we have less information is attached as an image.
> 
> We're looking at using some INVARIANTS and WITNESS kernels, but was 
> wondering if y'all had any other suggestions to use please?
> 
> thank you,
> -Alfred


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