i386/71392: 5.3-Beta2 crash: 'no buffers busy' after final sync

[db]

The following reply was made to PR i386/71392; it has been noted by GNATS.

From: db <db at traceroute.dk>
To: Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?= <des at des.no>
Cc: freebsd-gnats-submit at freebsd.org
Subject: Re: i386/71392: 5.3-Beta2 crash: 'no buffers busy' after final sync
Date: Mon, 27 Sep 2004 16:32:50 +0200

 On Monday 27 September 2004 15:37, you wrote:
 > db <db at traceroute.dk> writes:
 > > Upgraded to 5.3-Beta5, problem is still there. This is the last
 > > beta, so how can a bug like this still be unhandled?
 >
 > Because you didn't volunteer to track it down and fix it.
 
 1. I'm not a C programmer.
 2. I'm not a kernel hacker.
 3. I spend all my time on school/work/lockdown (1.1.0 o it's way).
 
 So the best I can do is report the bug and do that you debuggers tell me to 
 do.
 
 > Sniping aside, three points:
 >
 >  1) "No buffers busy after final sync" is not a bug.  You should get
 >     that message every time you shut down.
 
 I didn't write "No buffers busy after final sync", someone at FreeBSD did.
 
 >  2) Since the kernel panic you are experiencing occurrs after final
 >     sync on poweroff, and therefore does not cause significant loss of
 >     function or (more importantly) data corruption, it is not a high-
 >     priority issue.
 
 Hm ok..........
 
 >  3) You did not follow the documented procedure for reporting a kernel
 >     panic.  Section 18 of the FAQ contains instructions for producing
 >     a backtrace, which is the minimum information required.
 
 http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/65658
 http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/65702
 
 What have I learned from the above? Well, most users would think "hm, nobody 
 cares, I gonna stop writing bug reports", but I decided it give it another 
 try.
 
 > You can't expect a misfiled and incomplete report of a low-priority
 > issue to be fast-tracked ahead of the 4,415 other open bug reports in
 > our database, or even the 3,078 that aren't filed under doc or ports.
 
 I don't, but I except/hope a bug like this will be fixed before 5.3 is 
 released.
 
 > In closing, the panic you get when trying to power your system off is
 > mostly likely related to ACPI - either a bug in the ACPI code, or
 > (more likely) a bug in your system's DSDT.  Try booting with ACPI
 > disabled.
 
 Maybe a stupid question, but how? I found 
 http://www.freebsd.org/cgi/man.cgi?query=acpi&sektion=4 and it says: "To 
 disable the acpi driver completely, set the kernel environment variable 
 hint.acpi.0.disabled to 1", but I haven't got that one.
 I got:
 debug.acpi.acpi_ca_version: 0x20040527
 debug.acpi.semaphore_debug: 0
 hw.acpi.supported_sleep_state: S1 S4 S5
 hw.acpi.power_button_state: S5
 hw.acpi.sleep_button_state: S1
 hw.acpi.lid_switch_state: NONE
 hw.acpi.standby_state: S1
 hw.acpi.suspend_state: S3
 hw.acpi.sleep_delay: 1
 hw.acpi.s4bios: 0
 hw.acpi.verbose: 0
 hw.acpi.reset_video: 1
 hw.acpi.cpu.throttle_max: 2
 hw.acpi.cpu.throttle_state: 2
 hw.acpi.cpu.cx_supported: C1/0 C2/90
 hw.acpi.cpu.cx_lowest: C1
 hw.acpi.cpu.cx_usage: 100.00% 0.00%
 machdep.acpi_timer_freq: 3579545
 machdep.acpi_root: 1012112
 dev.acpi.0.%desc: VIA694 AWRDACPI
 dev.acpi.0.%driver: acpi
 dev.acpi.0.%parent: nexus0
 dev.acpi_sysresource.0.%desc: System Resource
 dev.acpi_sysresource.0.%driver: acpi_sysresource
 dev.acpi_sysresource.0.%location: handle=\_SB_.MEM_
 dev.acpi_sysresource.0.%pnpinfo: _HID=PNP0C01 _UID=0
 dev.acpi_sysresource.0.%parent: acpi0
 dev.acpi_sysresource.1.%desc: System Resource
 dev.acpi_sysresource.1.%driver: acpi_sysresource
 dev.acpi_sysresource.1.%location: handle=\_SB_.PCI0.SYSR
 dev.acpi_sysresource.1.%pnpinfo: _HID=PNP0C02 _UID=1
 dev.acpi_sysresource.1.%parent: acpi0
 dev.acpi_timer.0.%desc: 24-bit timer at 3.579545MHz
 dev.acpi_timer.0.%driver: acpi_timer
 dev.acpi_timer.0.%location: unknown
 dev.acpi_timer.0.%pnpinfo: unknown
 dev.acpi_timer.0.%parent: acpi0
 dev.cpu.0.%parent: acpi0
 dev.acpi_button.0.%desc: Power Button
 dev.acpi_button.0.%driver: acpi_button
 dev.acpi_button.0.%location: handle=\_SB_.PWRB
 dev.acpi_button.0.%pnpinfo: _HID=PNP0C0C _UID=0
 dev.acpi_button.0.%parent: acpi0
 dev.acpi_button.1.%desc: Sleep Button
 dev.acpi_button.1.%driver: acpi_button
 dev.acpi_button.1.%location: handle=\_SB_.SLPB
 dev.acpi_button.1.%pnpinfo: _HID=PNP0C0E _UID=0
 dev.acpi_button.1.%parent: acpi0
 dev.acpi_button.1.wake: 1
 dev.pcib.0.%parent: acpi0
 dev.atpic.0.%parent: acpi0
 dev.atdma.0.%parent: acpi0
 dev.attimer.0.%parent: acpi0
 dev.attimer.1.%parent: acpi0
 dev.npxisa.0.%parent: acpi0
 dev.fdc.0.%parent: acpi0
 dev.sio.0.%parent: acpi0
 dev.sio.1.%parent: acpi0
 dev.ppc.0.%parent: acpi0
 dev.psmcpnp.0.%parent: acpi0
 dev.atkbdc.0.%parent: acpi0
 
 br
 db