Messages in this thread | | | Date | Mon, 7 Nov 2022 16:12:20 +0100 | From | Peter Zijlstra <> | Subject | Re: [tip:x86/mm] [x86/mm] b389949485: WARNING:at_arch/x86/mm/pat/set_memory.c:#__change_page_attr |
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On Sun, Nov 06, 2022 at 08:38:27PM +0800, kernel test robot wrote: > > Greeting, > > FYI, we noticed WARNING:at_arch/x86/mm/pat/set_memory.c:#__change_page_attr due to commit (built with gcc-11): > > commit: b38994948567e6d6b62947401c57f4ab2efe070c ("x86/mm: Implement native set_memory_rox()") > https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git x86/mm > > [test failed on linux-next/master 0cdb3579f1ee4c1e55acf8dfb0697b660067b1f8] > > in testcase: boot > > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G > > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): > > > If you fix the issue, kindly add following tag > | Reported-by: kernel test robot <oliver.sang@intel.com> > | Link: https://lore.kernel.org/oe-lkp/202211061748.eb591682-oliver.sang@intel.com > > > [ 44.943065][ T11] ------------[ cut here ]------------ > [ 44.943725][ T11] CPA detected W^X violation: 0000000000000060 -> 0000000000000063 range: 0xffff8881beca5000 - 0xffff8881beca5fff PFN 1beca5 > [ 44.944929][ T11] WARNING: CPU: 0 PID: 11 at arch/x86/mm/pat/set_memory.c:609 __change_page_attr (arch/x86/mm/pat/set_memory.c:609 arch/x86/mm/pat/set_memory.c:1582) > [ 44.945824][ T11] Modules linked in: > [ 44.946229][ T11] CPU: 0 PID: 11 Comm: kworker/0:1 Tainted: G W 6.1.0-rc3-00010-gb38994948567 #1 f37474c2082f37dd433f70907b94c2b0df8d70b8 > [ 44.947518][ T11] Workqueue: events bpf_prog_free_deferred > [ 44.948074][ T11] RIP: 0010:__change_page_attr (arch/x86/mm/pat/set_memory.c:609 arch/x86/mm/pat/set_memory.c:1582)
Urgh, as spotted by dhansen, the code in change_page_attr_set_clr(), specifically the checkalias thing, seems to rely on single bit flips for NX.
Let me try to make sense of this stuff....
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