Bug 33397
| Summary: | "panic: unknown/reserved trap" with moderate network usage and recent -STABLE | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Robin Breathe <robin> |
| Component: | kern | Assignee: | freebsd-bugs (Nobody) <bugs> |
| Status: | Closed FIXED | ||
| Severity: | Affects Only Me | ||
| Priority: | Normal | ||
| Version: | 4.5-PRERELEASE | ||
| Hardware: | Any | ||
| OS: | Any | ||
|
Description
Robin Breathe
2001-12-31 17:40:01 UTC
I think the problem is related to some recent change in the SMP code.
Having been fiddling with this for the last week, I've found that a more
common lock is of the following form:
Fatal trap 12: page fault while in kernel mode
mp_lock = 01000002; cpuid = 1; lapic.id = 01000000
fault virtual address = 0x30
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc01f0fe5
# nm -n /kernel | grep c01f0f
c01f0f9c t acquire_lock
c01f0ffc t free_lock
stack pointer = 0x10:0xff80fe28
frame pointer = 0x10:0xff80fe30
code segment = base rx0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = Idle
interrupt mask = bio <- SMP: XXX
trap number = 12
panic: page fault
mp_lock = 01000002; cpuid = 1; lapic.id = 01000000
boot() called on cpu#1
Uptime: 23m13s
Automatic reboot in 15 seconds - press a key on the console to abort
Am I right in thinking this is something SMP-related? Kernel conf is as
above, as is dmesg, though this is now going from a cvsup at roughly 9pm
GMT 06/01/2002. I've been seeing a lot of locks over the past few days
pointing to this same section of the kernel.
Another particularly mysterious symptom is that the network would
lock-up, unless I kept a ping -f going on the serial console. On an SMP
kernel, this would cause a kernel panic within seconds, but on a UP
kernel it was stable (so long as I kept the ping flood going)... after
cvsup'ing this evening, that seems to have cleared up, but the kernel
panics continue on overdrive. Either ping-f, or a fast samba copy seem
to spark it.
I'd really love to get some input on this: is it a kernel bug, is it
hardware(!?), is it OBL?
Robin Breathe
On Mon, 31 Dec 2001 09:35:46 PST, Robin Breathe wrote:
>Number: 33397
>Category: kern
>Synopsis: "panic: unknown/reserved trap" with moderate network usage
[...]
Matt, Bosko and Alfred,
I'm pretty sure that this ought to fall into one of your laps.
Any takers?
Ciao,
Sheldon.
The machine has now been dismantled, so aside from analysing the dumps, this PR might as well be closed. Robin Breathe State Changed From-To: open->closed Closed at submitteres request as machines has been dismantled. |
