Date: Mon, 10 Nov 2008 02:16:55 GMT From: Jian Qiu <qj@huawei.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/128744: AMD64 kernel panic if INVARIANTS and DEBUG_MEMGUARD DEBUG_REDZONE are enabled Message-ID: <200811100216.mAA2GteE001529@www.freebsd.org> Resent-Message-ID: <200811100220.mAA2K30a015419@freefall.freebsd.org>
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>Number: 128744
>Category: kern
>Synopsis: AMD64 kernel panic if INVARIANTS and DEBUG_MEMGUARD DEBUG_REDZONE are enabled
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Nov 10 02:20:03 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator: Jian Qiu
>Release: 7.1-BETA2
>Organization:
Huawei Technology
>Environment:
FreeBSD testAMD64 7.1-BETA2 FreeBSD 7.1-BETA2 #0: Mon Nov 10 04:57:12 CST 2008
qj@hostAMD64:/usr/home/qj/gobi/compile/sys/amd64/compile/GENERIC amd64
>Description:
When compiled the kernel with the following options:
options INVARIANTS
options INVARIANT_SUPPORT
options DEBUG_MEMGUARD
options DEBUG_REDZONE
The following kernel panic messages were reported:
FreeBSD 7.1-BETA2 #0: Mon Nov 10 05:13:21 CST 2008
qj@hostAMD64:/usr/home/qj/gobi/compile/sys/amd64/compile/GENERIC
WARNING: WITNESS option enabled, expect reduced performance.
MEMGUARD DEBUGGING ALLOCATOR INITIALIZED:
MEMGUARD map base: 0xffffffff80e22000
MEMGUARD map limit: 0xffffffff815f7000
MEMGUARD map size: 8212480 (Bytes)
Memory modified after free 0xffffff000105bd00(248) val=4 @ 0xffffff000105bdd0
panic: Most recently used by none
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
panic() at panic+0x182
mtrash_ctor() at mtrash_ctor+0x84
uma_zalloc_arg() at uma_zalloc_arg+0x2db
malloc() at malloc+0xb6
init_dynamic_kenv() at init_dynamic_kenv+0x6d
mi_startup() at mi_startup+0x59
btext() at btext+0x2c
KDB: enter: panic
[thread pid 0 tid 0 ]
Stopped at kdb_enter_why+0x3d: movq $0,0x5fe498(%rip)
But after I removed the lines of DEBUG_MEMGUARD and DEBUG_REDZONE, the compiled kernel could boot into the system smoothly.
I do not know whether FreeBSD allows the two set of options enabled simultaneouly. But it should be noted that when I compiled the kernel with the same configuration for a i386 system, the kernel panic did not occur. So this issue should be specific for arch AMD64.
>How-To-Repeat:
Compiled kernel with the following options for arch AMD64:
options INVARIANTS
options INVARIANT_SUPPORT
options DEBUG_MEMGUARD
options DEBUG_REDZONE
>Fix:
Remove
options DEBUG_MEMGUARD
options DEBUG_REDZONE
>Release-Note:
>Audit-Trail:
>Unformatted:
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