kern/117150: USB zyd device under moderate load panics system

"John Merryweather Cooper" <John Merryweather Cooper john_m_cooper at
Sat Oct 13 01:40:02 PDT 2007

>Number:         117150
>Category:       kern
>Synopsis:       USB zyd device under moderate load panics system
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Oct 13 08:40:01 UTC 2007
>Originator:     John Merryweather Cooper
>Release:        FreeBSD 7.0-PRERELEASE amd64

System: FreeBSD 7.0-PRERELEASE #13: Fri Oct 12 02:08:13 PDT 2007
    root at


USB zyd device triggers core dumps reliably (every time) under moderate load.  See below for details.


1) plug in USB zyd device;
2) run moderate traffice through it (# cd /usr/src && make update)

borgdemon3# kgdb kernel.debug /var/crash/vmcore.0
[GDB will not be able to debug user-mode threads: /usr/lib/ Undefined symbol "ps_pglobal_lookup"]
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This GDB was configured as "amd64-marcel-freebsd".
Cannot access memory at address 0x1030000

Unread portion of the kernel message buffer:

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0x2734
fault code              = supervisor write data, page not present
instruction pointer     = 0x8:0xffffffff808a84fa
stack pointer           = 0x10:0xffffffffab8dfaf0
frame pointer           = 0x10:0xffffffffab8dfb30
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 23 (irq22: ohci0 ehci0)
trap number             = 12
panic: page fault
cpuid = 1
Uptime: 33m34s
Physical memory: 1973 MB
Dumping 138 MB: 123 107 91 75 59 43 27 11

#0  doadump () at pcpu.h:194
194             __asm __volatile("movq %%gs:0,%0" : "=r" (td));




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