Date: Mon, 21 Feb 2011 23:10:24 +0200 From: Kostik Belousov <kostikbel@gmail.com> To: Mike Tancsa <mike@sentex.net> Cc: freebsd-current@freebsd.org, freebsd-stable@freebsd.org Subject: Re: About "panic: bufwrite: buffer is not busy???" Message-ID: <20110221211024.GV78089@deviant.kiev.zoral.com.ua> In-Reply-To: <4D6133AC.6070507@sentex.net> References: <4D4A38FD.7000607@rdtc.ru> <4D3011DB.9050900@frasunek.com> <4FD1B1C3-08A7-4F48-A30A-DE5A8F3D3834@averesystems.com> <E1PrAM9-0001fN-00.samspeed-mail-ru@f30.mail.ru> <4D6133AC.6070507@sentex.net>
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On Sun, Feb 20, 2011 at 10:30:52AM -0500, Mike Tancsa wrote:
> On 2/20/2011 9:33 AM, Andrey Smagin wrote:
> > On week -current I have same problem, my box paniced every 2-15 min. I =
resolve problem by next steps - unplug network connectors from 2 intel em (=
82574L) cards. I think last time that mpd5 related panic, but mpd5 work wit=
h another re interface interated on MB. I think it may be em related panic,=
or em+mpd5.
>=20
> The latest panic I saw didnt have anything to do with em. Are you sure
> your crashes are because of the nic drive ?
>=20
> The latest I saw was on Friday.
>=20
> # kgdb /usr/obj/usr/src/sys/router/kernel.debug vmcore.11
> (kgdb) bt
> #0 doadump () at pcpu.h:231
> #1 0xc04a51f9 in db_fncall (dummy1=3D1, dummy2=3D0, dummy3=3D-1063333856,
> dummy4=3D0xc6b9696c "") at /usr/src/sys/ddb/db_command.c:548
> #2 0xc04a55f1 in db_command (last_cmdp=3D0xc096f73c, cmd_table=3D0x0,
> dopager=3D1) at /usr/src/sys/ddb/db_command.c:445
> #3 0xc04a574a in db_command_loop () at /usr/src/sys/ddb/db_command.c:498
> #4 0xc04a764d in db_trap (type=3D12, code=3D0) at
> /usr/src/sys/ddb/db_main.c:229
> #5 0xc068ba7e in kdb_trap (type=3D12, code=3D0, tf=3D0xc6b96b94) at
> /usr/src/sys/kern/subr_kdb.c:546
> #6 0xc088056f in trap_fatal (frame=3D0xc6b96b94, eva=3D52) at
> /usr/src/sys/i386/i386/trap.c:937
> #7 0xc0880830 in trap_pfault (frame=3D0xc6b96b94, usermode=3D0, eva=3D52=
) at
> /usr/src/sys/i386/i386/trap.c:859
> #8 0xc0880d4a in trap (frame=3D0xc6b96b94) at
> /usr/src/sys/i386/i386/trap.c:532
> #9 0xc086716c in calltrap () at /usr/src/sys/i386/i386/exception.s:166
> #10 0xc0657a16 in uihold (uip=3D0x0) at /usr/src/sys/kern/kern_resource.c=
:1248
> #11 0xc0654ec9 in crcopy (dest=3D0xce3ee800, src=3D0xce3ee600) at
> /usr/src/sys/kern/kern_prot.c:1873
> #12 0xc0654fd1 in crcopysafe (p=3D0xc90cc810, cr=3D0xce3ee800) at
> /usr/src/sys/kern/kern_prot.c:1950
> #13 0xc0656d7f in seteuid (td=3D0xc9196b80, uap=3D0xc6b96cec) at
> /usr/src/sys/kern/kern_prot.c:615
> #14 0xc06985ff in syscallenter (td=3D0xc9196b80, sa=3D0xc6b96ce4) at
> /usr/src/sys/kern/subr_trap.c:315
> #15 0xc0880884 in syscall (frame=3D0xc6b96d28) at
> /usr/src/sys/i386/i386/trap.c:1061
> #16 0xc08671d1 in Xint0x80_syscall () at
> /usr/src/sys/i386/i386/exception.s:264
> #17 0x00000033 in ?? ()
>=20
> (kgdb) frame 10
> #10 0xc0657a16 in uihold (uip=3D0x0) at /usr/src/sys/kern/kern_resource.c=
:1248
> 1248 {
> (kgdb) list
> 1243 * Place another refcount on a uidinfo struct.
> 1244 */
> 1245 void
> 1246 uihold(uip)
> 1247 struct uidinfo *uip;
> 1248 {
> 1249
> 1250 refcount_acquire(&uip->ui_ref);
> 1251 }
> 1252
> (kgdb) p *uip
> Cannot access memory at address 0x0
> (kgdb) p uip
> $1 =3D (struct uidinfo *) 0x0
> (kgdb)
Is this reproducable ?
What system version is it ?
Could you, please, go to frame 12 and show the output of "p *p",
"p *(p->p_ucred)" ?
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