amd64/148106: nginx udplog causes kernel panic on 8.0-RELEASE-p2 amd64

[Alexey Samoylov]

>Number:         148106
>Category:       amd64
>Synopsis:       nginx udplog causes kernel panic on 8.0-RELEASE-p2 amd64
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jun 24 07:30:06 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Alexey Samoylov
>Release:        8.0-RELEASE-p2
>Organization:
E-Commerce LLC
>Environment:
FreeBSD foo.bar 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #0: Tue Feb  9 08:30:33 CET 2010     root at neo.vx.sk:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
Hello!

A few days ago I tried to use udplog module in nginx and was very upset of result:

Jun 14 08:11:15 srv2 kernel: pid 22283 (nginx), uid 1001: exited on
signal 11
Jun 14 08:11:15 srv2 kernel: pid 22284 (nginx), uid 1001: exited on
signal 11
Jun 14 08:11:15 srv2 kernel: pid 22281 (nginx), uid 1001: exited on
signal 11
Jun 14 08:11:15 srv2 kernel: pid 22288 (nginx), uid 1001: exited on
signal 11
Jun 14 08:11:15 srv2 kernel: pid 22275 (nginx), uid 1001: exited on
signal 11
Jun 14 08:11:15 srv2 kernel:
Jun 14 08:11:15 srv2 kernel:
Jun 14 08:11:15 srv2 kernel: Fatal trap 12: page fault while in kernel mode
Jun 14 08:11:15 srv2 kernel: cpuid = 5; apic id = 05
Jun 14 08:11:15 srv2 kernel: fault virtual address = 0x20
Jun 14 08:11:15 srv2 kernel: fault code = supervisor read data,
page not present
Jun 14 08:11:15 srv2 kernel: instruction pointer =
0x20:0xffffffff805ba22e
Jun 14 08:11:15 srv2 kernel: stack pointer =
0x28:0xffffff800012ba20
Jun 14 08:11:15 srv2 kernel: frame pointer =
0x28:0xffffff800012bb60
Jun 14 08:11:15 srv2 kernel: code segment = base 0x0,
limit 0xfffff, type 0x1b
Jun 14 08:11:15 srv2 kernel: = DPL 0, pres 1, long 1, def32 0, gran 1
Jun 14 08:11:15 srv2 kernel: processor eflags = interrupt enabled,
resume, IOPL = 0
Jun 14 08:11:15 srv2 kernel: current process = 0 (thread taskq)
Jun 14 08:11:15 srv2 kernel: trap number = 12
Jun 14 08:11:15 srv2 kernel: panic: page fault
Jun 14 08:11:15 srv2 kernel: cpuid = 5
Jun 14 08:11:15 srv2 kernel: Uptime: 30d3h6m15s
Jun 14 08:11:15 srv2 kernel: (ada0:ahcich0:0:0:0): Synchronize cache failed
Jun 14 08:11:15 srv2 kernel: (ada1:ahcich1:0:0:0): Synchronize cache failed
Jun 14 08:11:15 srv2 kernel: Cannot dump. Device not defined or unavailable.
Jun 14 08:11:15 srv2 kernel: Automatic reboot in 15 seconds - press a
key on the console to abort

nginx is compiled with udplog module.
Problem exists only if I use udplog directives in config file.

Software versions: 8.0-RELEASE-p2 amd64, nginx/0.8.35
>How-To-Repeat:
People in nginx mailing list say that this is a repeatable bug on 64bit FreeBSD.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: