Hello, FreeBSD.
I'm trying to create logging queue with alq kernel API. I call
alq_open_flags() like this in my module:
error = alq_open_flags(&sc->sc_alq, sc->sc_vnode_name,
curthread->td_ucred, ALQ_DEFAULT_CMODE,
sizeof(struct g_log_entry), ALQ_ORDERED);
and my system (10-CURRENT) panics with this stack trace (top frames
are DDB-related, so I omit them):
#5 0xc06101c3 in kdb_trap (type=12, code=0, tf=0xc4e29990)
at /usr/home/lev/FreeBSD-head/sys/kern/subr_kdb.c:620
#6 0xc08290af in trap_fatal (frame=0xc4e29990, eva=136)
at /usr/home/lev/FreeBSD-head/sys/i386/i386/trap.c:958
#7 0xc08292c0 in trap_pfault (frame=0xc4e29990, usermode=0, eva=136)
at /usr/home/lev/FreeBSD-head/sys/i386/i386/trap.c:880
#8 0xc0829f46 in trap (frame=0xc4e29990)
at /usr/home/lev/FreeBSD-head/sys/i386/i386/trap.c:555
#9 0xc0812e7c in calltrap ()
at /usr/home/lev/FreeBSD-head/sys/i386/i386/exception.s:168
#10 0xc05cafc0 in _mtx_lock_flags (m=0x78, opts=0,
file=0xc088c140 "/usr/home/lev/FreeBSD-head/sys/kern/vfs_subr.c",
line=2169) at /usr/home/lev/FreeBSD-head/sys/kern/kern_mutex.c:194
#11 0xc0672eb2 in vref (vp=0x0)
at /usr/home/lev/FreeBSD-head/sys/kern/vfs_subr.c:2169
#12 0xc066932f in namei (ndp=0xc4e29b74)
at /usr/home/lev/FreeBSD-head/sys/kern/vfs_lookup.c:264
#13 0xc0682900 in vn_open_cred (ndp=0xc4e29b74, flagp=0xc4e29be8, cmode=384,
vn_open_flags=0, cred=0xc50fee80, fp=0x0)
at /usr/home/lev/FreeBSD-head/sys/kern/vfs_vnops.c:137
#14 0xc5c42609 in alq_open_flags (alqp=0xc550dc08,
file=0xc5108d40 "/usr/ada4.log", cred=0xc50fee80, cmode=384, size=28,
flags=16)
at /usr/home/lev/FreeBSD-head/sys/modules/alq/../../kern/kern_alq.c:451
It seems, that vref() get NULL instead of valid pointer to struct
vnode. But I have no idea -- why?! Yes, I have no such file created,
but man alq(9) says, that it will create file for me. And if I point
to existed file, it panic anyway.
What do I do wrong?!
--
// Black Lion AKA Lev Serebryakov <l...@freebsd.org>
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