Date: Sun, 2 Oct 2011 19:32:23 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: current@freebsd.org, hackers@freebsd.org Cc: Lawrence Stewart <lstewart@freebsd.org> Subject: alq_open_flags() panics in _mtx_lock_flags() Message-ID: <1258376930.20111002193223@serebryakov.spb.ru>
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Hello, FreeBSD.
I'm trying to create logging queue with alq kernel API. I call
alq_open_flags() like this in my module:
error =3D 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=3D12, code=3D0, tf=3D0xc4e29990)
at /usr/home/lev/FreeBSD-head/sys/kern/subr_kdb.c:620
#6 0xc08290af in trap_fatal (frame=3D0xc4e29990, eva=3D136)
at /usr/home/lev/FreeBSD-head/sys/i386/i386/trap.c:958
#7 0xc08292c0 in trap_pfault (frame=3D0xc4e29990, usermode=3D0, eva=3D136)
at /usr/home/lev/FreeBSD-head/sys/i386/i386/trap.c:880
#8 0xc0829f46 in trap (frame=3D0xc4e29990)
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=3D0x78, opts=3D0,=20
file=3D0xc088c140 "/usr/home/lev/FreeBSD-head/sys/kern/vfs_subr.c",=20
line=3D2169) at /usr/home/lev/FreeBSD-head/sys/kern/kern_mutex.c:194
#11 0xc0672eb2 in vref (vp=3D0x0)
at /usr/home/lev/FreeBSD-head/sys/kern/vfs_subr.c:2169
#12 0xc066932f in namei (ndp=3D0xc4e29b74)
at /usr/home/lev/FreeBSD-head/sys/kern/vfs_lookup.c:264
#13 0xc0682900 in vn_open_cred (ndp=3D0xc4e29b74, flagp=3D0xc4e29be8, cmode=
=3D384,=20
vn_open_flags=3D0, cred=3D0xc50fee80, fp=3D0x0)
at /usr/home/lev/FreeBSD-head/sys/kern/vfs_vnops.c:137
#14 0xc5c42609 in alq_open_flags (alqp=3D0xc550dc08,=20
file=3D0xc5108d40 "/usr/ada4.log", cred=3D0xc50fee80, cmode=3D384, size=
=3D28,
flags=3D16)
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?!
--=20
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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