On 5/7/2015 7:08 AM, Johan Schuijt-Li wrote: > Hi, > > We’ve been seeing (seemingly) random reboots on 10.1-RELEASE virtual machines > (KVM virtualisation) on our production servers. In an attempt to determine > what was causing this we’ve switched to running a kernel with INVARIANTS > enabled. This resulted for us in the following panic: > > Unread portion of the kernel message buffer: > panic: pmap active 0xfffff8001b7154b8 > cpuid = 3 > KDB: stack backtrace: > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe03dd1493a0 > kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe03dd149450 > vpanic() at vpanic+0x126/frame 0xfffffe03dd149490 > kassert_panic() at kassert_panic+0x139/frame 0xfffffe03dd149500 > pmap_remove_pages() at pmap_remove_pages+0x8c/frame 0xfffffe03dd1495f0 > exec_new_vmspace() at exec_new_vmspace+0x16a/frame 0xfffffe03dd149650 > exec_elf64_imgact() at exec_elf64_imgact+0x658/frame 0xfffffe03dd149720 > kern_execve() at kern_execve+0x5e4/frame 0xfffffe03dd149a80 > sys_execve() at sys_execve+0x37/frame 0xfffffe03dd149ae0 > amd64_syscall() at amd64_syscall+0x25a/frame 0xfffffe03dd149bf0 > Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe03dd149bf0 > --- syscall (59, FreeBSD ELF64, sys_execve), rip = 0x80158af1a, rsp = > 0x7fffffffac38, rbp = 0x7fffffffad40 --- > > > I’ve only come across one other report here (without result unfortunate): > https://lists.freebsd.org/pipermail/freebsd-current/2014-June/050827.html > <https://lists.freebsd.org/pipermail/freebsd-current/2014-June/050827.html> >
I looked around for the conclusion of that thread but could not find it. I was reproducing so often I'm sure this case was fixed. I may have privately contacted one of the VM maintainers to fix it. However lacking evidence I think it just stopped happening for me and I never reported anything useful. > Are other people aware of this issue or working on this? > > I can provide access to a VM with a kernel dump and the kernel build for > extra information if needed. > What we really need is a full core dump (minidump) and backtrace. This will let us inspect the pmap state. https://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug.html https://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-gdb.html -- Regards, Bryan Drewery
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