Date: Mon, 2 Feb 2009 22:05:05 GMT From: Ken Merry <ken@FreeBSD.org> To: freebsd-gnats-submit@FreeBSD.org Subject: amd64/131314: large modules fail to load on amd64 Message-ID: <200902022205.n12M55rD034193@www.freebsd.org> Resent-Message-ID: <200902022210.n12MA1Y5097636@freefall.freebsd.org>
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>Number: 131314
>Category: amd64
>Synopsis: large modules fail to load on amd64
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-amd64
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Feb 02 22:10:01 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator: Ken Merry
>Release: 7.1
>Organization:
>Environment:
>Description:
Loading a large module (2.5MB in size) on amd64 panics the kernel. We found a work-around, which was to remove a static structure that was 700K in size. After that the module loads without a problem.
The same module worked fine on i386 with the static structure in place.
# kldload ./hasc.module Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01 fault virtual address = 0xfffffffffb3b6000 fault code = supervisor write data, page not present
instruction pointer = 0x8:0xffffffff8044c49a
stack pointer = 0x10:0xfffffffffb11d600
frame pointer = 0x10:0xfffffffffb11d790
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 = 840 (kldload)
[thread pid 840 tid 100106 ]
Stopped at 0xffffffff8044c49a = bzero+0xa: repe stosq %es:(%rdi)
db> bt
Tracing pid 840 tid 100106 td 0xffffff0004c45a50
bzero() at 0xffffffff8044c49a = bzero+0xa
linker_load_module() at 0xffffffff802d02cf = linker_load_module+0x8cf
kern_kldload() at 0xffffffff802d0847 = kern_kldload+0xa7
kldload() at 0xffffffff802d0934 = kldload+0x84
syscall() at 0xffffffff8044d65b = syscall+0x1cb
Xfast_syscall() at 0xffffffff8043346b = Xfast_syscall+0xab
--- syscall (304, FreeBSD ELF64, kldload), rip = 0x800683c6c, rsp =
+0x7fffffffec38, rbp = 0 ---
db>
>How-To-Repeat:
Come up with a large kernel loadable module. Try to load it on amd64, and see the kernel crash.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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