Hello, The following program triggers GPF in kvm_pic_clear_all if run in a tight parallel loop: general protection fault: 0000 [#71] SMP DEBUG_PAGEALLOC KASAN Modules linked in: CPU: 0 PID: 7107 Comm: a2.out Tainted: G D 4.5.0-rc3+ #326 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88002144df00 ti: ffff8800219a0000 task.ti: ffff8800219a0000 RIP: 0010:[<ffffffff81467875>] [<ffffffff81467875>] do_raw_spin_lock+0x25/0x2b0 RSP: 0018:ffff8800219a7840 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: ffff8800219a7868 R08: 0000000000000001 R09: 0000000000000000 R10: ffff88002144df00 R11: 0000000000000018 R12: 0000000000000002 R13: 0000000000000130 R14: 0000000000000000 R15: ffff880022f874e0 FS: 00007f6181c19700(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 000000c82071a140 CR3: 0000000027104000 CR4: 00000000000026f0 Stack: 0000000000000000 0000000000000002 0000000000000130 0000000000000000 ffff880022f874e0 ffff8800219a7888 ffffffff8666031b ffffffff810cc11c 00000000000000b0 ffff8800219a78b8 ffffffff810cc11c ffff88004ea70000 Call Trace: [< inline >] __raw_spin_lock include/linux/spinlock_api_smp.h:145 [<ffffffff8666031b>] _raw_spin_lock+0x3b/0x50 kernel/locking/spinlock.c:151 [< inline >] spin_lock include/linux/spinlock.h:302 [< inline >] pic_lock arch/x86/kvm/i8259.c:45 [<ffffffff810cc11c>] kvm_pic_clear_all+0x2c/0x60 arch/x86/kvm/i8259.c:213 [<ffffffff810e31d9>] kvm_free_irq_source_id+0xa9/0xe0 arch/x86/kvm/irq_comm.c:186 [<ffffffff810de6cf>] kvm_create_pit+0x51f/0x6d0 arch/x86/kvm/i8254.c:711 [<ffffffff81061122>] kvm_arch_vm_ioctl+0xaa2/0x1dc0 arch/x86/kvm/x86.c:3856 [<ffffffff8102013c>] kvm_vm_ioctl+0x17c/0xfe0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2891 [< inline >] vfs_ioctl fs/ioctl.c:43 [<ffffffff817fc26c>] do_vfs_ioctl+0x18c/0xfb0 fs/ioctl.c:674 [< inline >] SYSC_ioctl fs/ioctl.c:689 [<ffffffff817fd11f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:680 [<ffffffff866613f6>] entry_SYSCALL_64_fastpath+0x16/0x7a arch/x86/entry/entry_64.S:185 Code: 84 00 00 00 00 00 55 48 b8 00 00 00 00 00 fc ff df 48 89 e5 41 57 41 56 41 55 41 54 53 48 89 fb 48 83 c7 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 RIP [< inline >] debug_spin_lock_before kernel/locking/spinlock_debug.c:83 RIP [<ffffffff81467875>] do_raw_spin_lock+0x25/0x2b0 kernel/locking/spinlock_debug.c:135 RSP <ffff8800219a7840> ---[ end trace a9bcc650712efe82 ]--- BUG: sleeping function called from invalid context at include/linux/sched.h:2805 in_atomic(): 1, irqs_disabled(): 0, pid: 7107, name: a2.out lockdep is turned off. CPU: 0 PID: 7107 Comm: a2.out Tainted: G D 4.5.0-rc3+ #326 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 ffffffff87b05080 ffff8800219a7470 ffffffff82be461f ffffffff00000016 fffffbfff0f60a10 ffff88002144df00 0000000000001bc3 0000000000000000 0000000000000000 dffffc0000000000 ffff8800219a7498 ffffffff813cd42b Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff82be461f>] dump_stack+0x12e/0x18f lib/dump_stack.c:51 [<ffffffff813cd42b>] ___might_sleep+0x27b/0x3a0 kernel/sched/core.c:7703 [<ffffffff813cd5e0>] __might_sleep+0x90/0x1a0 kernel/sched/core.c:7665 [< inline >] threadgroup_change_begin include/linux/sched.h:2805 [<ffffffff81384b11>] exit_signals+0x81/0x430 kernel/signal.c:2392 [<ffffffff8135de3c>] do_exit+0x23c/0x2cb0 kernel/exit.c:701 [<ffffffff811aa28f>] oops_end+0x9f/0xd0 arch/x86/kernel/dumpstack.c:250 [<ffffffff811aa686>] die+0x46/0x60 arch/x86/kernel/dumpstack.c:316 [<ffffffff811a4725>] do_general_protection+0x235/0x3e0 arch/x86/kernel/traps.c:463 [<ffffffff866636a8>] general_protection+0x28/0x30 arch/x86/entry/entry_64.S:982 [< inline >] __raw_spin_lock include/linux/spinlock_api_smp.h:145 [<ffffffff8666031b>] _raw_spin_lock+0x3b/0x50 kernel/locking/spinlock.c:151 [< inline >] spin_lock include/linux/spinlock.h:302 [< inline >] pic_lock arch/x86/kvm/i8259.c:45 [<ffffffff810cc11c>] kvm_pic_clear_all+0x2c/0x60 arch/x86/kvm/i8259.c:213 [<ffffffff810e31d9>] kvm_free_irq_source_id+0xa9/0xe0 arch/x86/kvm/irq_comm.c:186 [<ffffffff810de6cf>] kvm_create_pit+0x51f/0x6d0 arch/x86/kvm/i8254.c:711 [<ffffffff81061122>] kvm_arch_vm_ioctl+0xaa2/0x1dc0 arch/x86/kvm/x86.c:3856 [<ffffffff8102013c>] kvm_vm_ioctl+0x17c/0xfe0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2891 [< inline >] vfs_ioctl fs/ioctl.c:43 [<ffffffff817fc26c>] do_vfs_ioctl+0x18c/0xfb0 fs/ioctl.c:674 [< inline >] SYSC_ioctl fs/ioctl.c:689 [<ffffffff817fd11f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:680 [<ffffffff866613f6>] entry_SYSCALL_64_fastpath+0x16/0x7a arch/x86/entry/entry_64.S:185 note: a2.out[7107] exited with preempt_count 1 // autogenerated by syzkaller (http://github.com/google/syzkaller) #include <pthread.h> #include <stdint.h> #include <string.h> #include <sys/syscall.h> #include <unistd.h> long r[23]; void* thr(void* arg) { switch ((long)arg) { case 0: r[0] = syscall(SYS_mmap, 0x20000000ul, 0xe000ul, 0x3ul, 0x32ul, 0xfffffffffffffffful, 0x0ul); break; case 1: memcpy((void*)0x20001000, "\x2f\x64\x65\x76\x2f\x6b\x76\x6d\x00", 9); r[2] = syscall(SYS_open, "/dev/kvm", 0x2000ul, 0, 0, 0); break; case 2: r[3] = syscall(SYS_ioctl, r[2], 0xae01ul, 0x0ul, 0, 0, 0); break; case 3: r[4] = syscall(SYS_ioctl, r[3], 0xae60ul, 0, 0, 0, 0); break; case 4: r[5] = syscall(SYS_prctl, 0x23ul, 0x4ul, 0x20000000ul, 0, 0, 0); break; case 5: *(uint32_t*)0x20009000 = (uint32_t)0x4; *(uint32_t*)0x20009004 = (uint32_t)0x0; *(uint32_t*)0x20009008 = (uint32_t)0x0; *(uint32_t*)0x2000900c = (uint32_t)0x0; *(uint32_t*)0x20009010 = (uint32_t)0x0; *(uint32_t*)0x20009014 = (uint32_t)0x0; *(uint32_t*)0x20009018 = (uint32_t)0x0; *(uint32_t*)0x2000901c = (uint32_t)0x0; *(uint32_t*)0x20009020 = (uint32_t)0x0; *(uint32_t*)0x20009024 = (uint32_t)0x0; *(uint32_t*)0x20009028 = (uint32_t)0x0; *(uint32_t*)0x2000902c = (uint32_t)0x0; *(uint32_t*)0x20009030 = (uint32_t)0x0; *(uint32_t*)0x20009034 = (uint32_t)0x0; *(uint32_t*)0x20009038 = (uint32_t)0x0; *(uint32_t*)0x2000903c = (uint32_t)0x0; r[22] = syscall(SYS_ioctl, r[3], 0x4040ae77ul, 0x20009000ul, 0, 0, 0); break; } return 0; } int main() { long i; pthread_t th[6]; srand(getpid()); memset(r, -1, sizeof(r)); for (i = 0; i < 6; i++) { pthread_create(&th[i], 0, thr, (void*)i); usleep(1000+rand()%1000); } for (i = 0; i < 6; i++) { pthread_create(&th[i], 0, thr, (void*)i); if (rand()%2) usleep(rand()%1000); } usleep(20000); return 0; } On commit 388f7b1d6e8ca06762e2454d28d6c3c55ad0fe95 (4.5-rc3) -- 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
