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Subject: [Bug 191359] New: [PANIC] Memory modified after free w/MEMGUARD build
Date: Wed, 25 Jun 2014 09:28:13 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 11.0-CURRENT
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Some People
X-Bugzilla-Who: pho@FreeBSD.org
X-Bugzilla-Status: Needs Triage
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191359

            Bug ID: 191359
           Summary: [PANIC] Memory modified after free w/MEMGUARD build
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: pho@FreeBSD.org

db:0:pho> bt
Tracing pid 785 tid 100153 td 0xfffff8002a52c490
uma_find_refcnt() at uma_find_refcnt+0x33/frame 0xfffffe17288d2590
mb_ctor_clust() at mb_ctor_clust+0x8f/frame 0xfffffe17288d25c0
uma_zalloc_arg() at uma_zalloc_arg+0x164/frame 0xfffffe17288d2660
m_getjcl() at m_getjcl+0xa3/frame 0xfffffe17288d26b0
m_getm2() at m_getm2+0xe7/frame 0xfffffe17288d2700
m_uiotombuf() at m_uiotombuf+0xa4/frame 0xfffffe17288d2770
sosend_generic() at sosend_generic+0x6cc/frame 0xfffffe17288d2820
sosend() at sosend+0x5d/frame 0xfffffe17288d2880
soo_write() at soo_write+0x42/frame 0xfffffe17288d28b0
dofilewrite() at dofilewrite+0x88/frame 0xfffffe17288d2900
kern_writev() at kern_writev+0x68/frame 0xfffffe17288d2950
sys_write() at sys_write+0x63/frame 0xfffffe17288d29a0
amd64_syscall() at amd64_syscall+0x278/frame 0xfffffe17288d2ab0

How to repeat:
sysctl vm.memguard.options=3; sysctl vm.memguard.desc=allocdirect +
ssh activity

Details: http://people.freebsd.org/~pho/stress/log/memguard4.txt

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