Hello, The following program triggers WARNING in __x86_set_memory_region if run in a loop: https://gist.githubusercontent.com/dvyukov/efadb6b001717a896b0c281f85880988/raw/17dda56adba33020d8f3b89bd91363b60f49be24/gistfile1.txt On commit 015ed9433be2b476ec7e2e6a9a411a56e3b5b035 (Nov 11). WARNING: CPU: 3 PID: 11295 at arch/x86/kvm/x86.c:7910 __x86_set_memory_region+0x43e/0x4e0 Kernel panic - not syncing: panic_on_warn set ... CPU: 3 PID: 11295 Comm: syz-executor Not tainted 4.9.0-rc4+ #41 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 ffff88006753fb10 ffffffff81c2f79b ffffffff83271fc0 ffff88006753fbe8 ffffffff8321a100 ffffffff81094c2e ffff88006753fbd8 ffffffff81548463 0000000041b58ab3 ffffffff837cd50d ffffffff815482ac ffffffff815490e9 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff81c2f79b>] dump_stack+0xb3/0x118 lib/dump_stack.c:51 [<ffffffff81548463>] panic+0x1b7/0x3a3 kernel/panic.c:179 [<ffffffff81240014>] __warn+0x1c4/0x1e0 kernel/panic.c:542 [<ffffffff812401fc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 [<ffffffff81094c2e>] __x86_set_memory_region+0x43e/0x4e0 arch/x86/kvm/x86.c:7910 [<ffffffff81094d0e>] x86_set_memory_region+0x3e/0x60 arch/x86/kvm/x86.c:7922 [<ffffffff810b6a93>] kvm_arch_destroy_vm+0x523/0x620 arch/x86/kvm/x86.c:7939 [< inline >] kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:731 [<ffffffff810587ae>] kvm_put_kvm+0x40e/0x790 arch/x86/kvm/../../../virt/kvm/kvm_main.c:752 [<ffffffff81058c82>] kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:763 [<ffffffff81679239>] __fput+0x289/0x6f0 fs/file_table.c:208 [<ffffffff81679725>] ____fput+0x15/0x20 fs/file_table.c:244 [<ffffffff812a2999>] task_work_run+0xf9/0x170 kernel/task_work.c:116 [< inline >] tracehook_notify_resume include/linux/tracehook.h:191 [<ffffffff81003a26>] exit_to_usermode_loop+0x126/0x150 arch/x86/entry/common.c:160 [< inline >] prepare_exit_to_usermode arch/x86/entry/common.c:190 [<ffffffff81006060>] syscall_return_slowpath+0x1a0/0x1e0 arch/x86/entry/common.c:259 [<ffffffff831ebda2>] entry_SYSCALL_64_fastpath+0xc0/0xc2 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled reboot: cpu_has_vmx: ecx=80a02021 1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
