Date: Mon, 13 Jul 2009 19:15:04 +0200 From: Ulrich =?utf-8?B?U3DDtnJsZWlu?= <uqs@spoerlein.net> To: Kip Macy <kmacy@freebsd.org> Cc: current@freebsd.org Subject: Re: panic: vm_page_free_toq: freeing mapped page Message-ID: <20090713171503.GA76464@acme.spoerlein.net> In-Reply-To: <3c1674c90907121422v1a45de5bnc4f83c767bd4d331@mail.gmail.com> References: <20090712203105.GJ2145@acme.spoerlein.net> <3c1674c90907121422v1a45de5bnc4f83c767bd4d331@mail.gmail.com>
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On Sun, 12.07.2009 at 14:22:23 -0700, Kip Macy wrote: > On Sun, Jul 12, 2009 at 1:31 PM, Ulrich Spörlein<uqs@spoerlein.net> wrote: > > Hi, > > > > 8.0 BETA1 @ r195622 will panic reliably when running the clang static > > analyzer on a buildworld with something like the following panic: > > > > panic: vm_page_free_toq: freeing mapped page 0xffffff00c9715b30 > > cpuid = 1 > > KDB: stack backtrace: > > db_trace_self_wrapper() at db_trace_self_wrapper+0x2a > > panic() at panic+0x182 > > vm_page_free_toq() at vm_page_free_toq+0x1f6 > > vm_object_terminate() at vm_object_terminate+0xb7 > > vm_object_deallocate() at vm_object_deallocate+0x17a > > _vm_map_unlock() at _vm_map_unlock+0x70 > > vm_map_remove() at vm_map_remove+0x6f > > vmspace_free() at vmspace_free+0x56 > > vmspace_exec() at vmspace_exec+0x56 > > exec_new_vmspace() at exec_new_vmspace+0x133 > > exec_elf32_imgact() at exec_elf32_imgact+0x2ee > > kern_execve() at kern_execve+0x3b2 > > execve() at execve+0x3d > > syscall() at syscall+0x1af > > Xfast_syscall() at Xfast_syscall+0xe1 > > --- syscall (59, FreeBSD ELF64, execve), rip = 0x800c20d0c, rsp = 0x7fffffffd6f8, rbp = 0x7fffffffdbf0 --- > Can you try the following change: > > http://svn.freebsd.org/viewvc/base/user/kmacy/releng_7_2_fcs/sys/vm/vm_object.c?r1=192842&r2=195297 Applied this to HEAD by hand an ran with it, it died 20-30 minutes into the scan-build run. So no luck there. Next up is a test using the GENERIC kernel. Cheers, Uli
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