Possible kqueue related issue on STABLE/RC.

[Patrick Lamaiziere]

Le Mon, 23 Sep 2013 23:31:41 +0300,
Konstantin Belousov <kostikbel at gmail.com> a écrit :

Hello,

...


> > Ok This has been mfced to 9.2-STABLE. But I still see this panic
> > with 9-2/STABLE of today (Revision : 255811). This may be better
> > because before the box paniced within minutes and now within hours
> > (still using poudriere).
> > 
> > panic:
> > fault code              = supervisor read data, page not present
> > instruction pointer     = 0x20:0xffffffff808ebfcd
> > stack pointer           = 0x28:0xffffff824c2e0630
> > frame pointer           = 0x28:0xffffff824c2e06a0
> > code segment            = base 0x0, limit 0xfffff, type 0x1b
> >                         = DPL 0, pres 1, long 1, def32 0, gran 1
> > processor eflags        = interrupt enabled, resume, IOPL = 0
> > current process         = 54243 (gvfsd-trash)
> > trap number             = 12
> > panic: page fault
> > cpuid = 2
> > KDB: stack backtrace:
> > #0 0xffffffff80939ad6 at kdb_backtrace+0x66
> > #1 0xffffffff808ffacd at panic+0x1cd
> > #2 0xffffffff80cdfbe9 at trap_fatal+0x289
> > #3 0xffffffff80cdff4f at trap_pfault+0x20f
> > #4 0xffffffff80ce0504 at trap+0x344
> > #5 0xffffffff80cc9b43 at calltrap+0x8
> > #6 0xffffffff8099d043 at filt_vfsvnode+0xf3
> > #7 0xffffffff808c4793 at kqueue_register+0x3e3
> > #8 0xffffffff808c4de8 at kern_kevent+0x108
> > #9 0xffffffff808c5950 at sys_kevent+0x90
> > #10 0xffffffff80cdf3a8 at amd64_syscall+0x5d8
> > #11 0xffffffff80cc9e27 at Xfast_syscall+0xf7
> > 
> > Full core.txt : 
> > http://user.lamaiziere.net/patrick/public/vfs_vnode-core.txt.0
> 
> For start, please load the core into kgdb and for
> frame 8
> p *kn

(kgdb) frame 8
#8  0xffffffff8099d043 in filt_vfsvnode (kn=0xfffffe0147a7f000, hint=0)
    at /usr/src/sys/kern/vfs_subr.c:4600
4600		VI_LOCK(vp);
(kgdb) p *kn
$1 = {kn_link = {sle_next = 0x0}, kn_selnext = {sle_next = 0x0}, 
  kn_knlist = 0x0, kn_tqe = {tqe_next = 0x0, tqe_prev = 0x0}, 
  kn_kq = 0xfffffe01079a6200, kn_kevent = {ident = 62, filter = -4, 
    flags = 32784, fflags = 0, data = 0, udata = 0x0}, kn_status = 24, 
  kn_sfflags = 47, kn_sdata = 0, kn_ptr = {p_fp = 0xfffffe016949e190, 
    p_proc = 0xfffffe016949e190, p_aio = 0xfffffe016949e190, 
    p_lio = 0xfffffe016949e190}, kn_fop = 0xffffffff812fd440, 
  kn_hook = 0xfffffe0119d0b1f8, kn_hookid = 0}


> Also, please follow
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html
> to recompile kernel with the debugging options and try to recreate
> the panic.

It's building.

Thanks, regards