Hello, The following program triggers GPF in kvm_irq_map_gsi: general protection fault: 0000 [#49] SMP DEBUG_PAGEALLOC KASAN Modules linked in: CPU: 0 PID: 5314 Comm: kvm-pit/4950 Tainted: G D 4.5.0-rc3+ #326 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88005b848000 ti: ffff880056b70000 task.ti: ffff880056b70000 RIP: 0010:[<ffffffff81029221>] [<ffffffff81029221>] kvm_irq_map_gsi+0x81/0x430 RSP: 0018:ffff880056b77b40 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 0000000000000024 RSI: ffff880056b77bd0 RDI: 0000000000000120 RBP: ffff880056b77b70 R08: 0000000000000000 R09: 0000000000000000 R10: ffff88005b848000 R11: ffff880055fd0390 R12: 0000000000000000 R13: ffff880055fd0000 R14: ffff880056b77bd0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007f87947bbd90 CR3: 000000002a2ed000 CR4: 00000000000026f0 Stack: ffff880055fd0390 ffff880055fd0240 ffff880055fd0390 ffff880056b77bd0 0000000000000000 0000000000000000 ffff880056b77cd8 ffffffff81029a7c ffffffff810299fe ffff88005b848000 1ffff1000ad6ef76 0000000200000001 Call Trace: [<ffffffff81029a7c>] kvm_set_irq+0x15c/0x440 arch/x86/kvm/../../../virt/kvm/irqchip.c:94 [<ffffffff810dbd39>] pit_do_work+0x109/0x350 arch/x86/kvm/i8254.c:297 [<ffffffff813b8309>] kthread_worker_fn+0x2d9/0x660 kernel/kthread.c:595 [<ffffffff813b7edf>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303 [<ffffffff866617af>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468 Code: 80 3d 59 0f 7f 07 00 0f 84 d8 02 00 00 e8 a8 29 54 00 49 8d bc 24 20 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8e 03 00 00 41 39 9c 24 20 RIP [<ffffffff81029221>] kvm_irq_map_gsi+0x81/0x430 arch/x86/kvm/../../../virt/kvm/irqchip.c:43 RSP <ffff880056b77b40> ---[ end trace a9bcc650712efe6c ]--- // 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[74]; 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*)0x2000d000, "\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: *(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[21] = syscall(SYS_ioctl, r[3], 0x4040ae77ul, 0x20009000ul, 0, 0, 0); break; case 5: *(uint32_t*)0x2000a6b9 = (uint32_t)0x3e; *(uint16_t*)0x2000a6bd = (uint16_t)0x8; *(uint8_t*)0x2000a6bf = (uint8_t)0x8d4; *(uint8_t*)0x2000a6c0 = (uint8_t)0xffffffffffff5fe9; *(uint8_t*)0x2000a6c1 = (uint8_t)0x80000001; *(uint8_t*)0x2000a6c2 = (uint8_t)0x0; *(uint8_t*)0x2000a6c3 = (uint8_t)0xbe2; *(uint8_t*)0x2000a6c4 = (uint8_t)0x9; *(uint8_t*)0x2000a6c5 = (uint8_t)0x7ff; *(uint8_t*)0x2000a6c6 = (uint8_t)0x1; *(uint8_t*)0x2000a6c7 = (uint8_t)0x1f; *(uint8_t*)0x2000a6c8 = (uint8_t)0x1d8; *(uint16_t*)0x2000a6c9 = (uint16_t)0x8; *(uint32_t*)0x2000a6cd = (uint32_t)0x736d; *(uint16_t*)0x2000a6d1 = (uint16_t)0x3; *(uint8_t*)0x2000a6d3 = (uint8_t)0xff; *(uint8_t*)0x2000a6d4 = (uint8_t)0x3; *(uint8_t*)0x2000a6d5 = (uint8_t)0xffffffffffff8000; *(uint8_t*)0x2000a6d6 = (uint8_t)0xc20; *(uint8_t*)0x2000a6d7 = (uint8_t)0x6; *(uint8_t*)0x2000a6d8 = (uint8_t)0x2; *(uint8_t*)0x2000a6d9 = (uint8_t)0x6; *(uint8_t*)0x2000a6da = (uint8_t)0x8; *(uint8_t*)0x2000a6db = (uint8_t)0x3; *(uint8_t*)0x2000a6dc = (uint8_t)0x1; *(uint16_t*)0x2000a6dd = (uint16_t)0xce; *(uint32_t*)0x2000a6e1 = (uint32_t)0xab85; *(uint16_t*)0x2000a6e5 = (uint16_t)0x0; *(uint8_t*)0x2000a6e7 = (uint8_t)0xa0e3; *(uint8_t*)0x2000a6e8 = (uint8_t)0x100000001; *(uint8_t*)0x2000a6e9 = (uint8_t)0x3; *(uint8_t*)0x2000a6ea = (uint8_t)0x1; *(uint8_t*)0x2000a6eb = (uint8_t)0x2; *(uint8_t*)0x2000a6ec = (uint8_t)0x1; *(uint8_t*)0x2000a6ed = (uint8_t)0x7ff; *(uint8_t*)0x2000a6ee = (uint8_t)0x2; *(uint8_t*)0x2000a6ef = (uint8_t)0x8a; *(uint8_t*)0x2000a6f0 = (uint8_t)0xca6; *(uint16_t*)0x2000a6f1 = (uint16_t)0x1; *(uint32_t*)0x2000a6f5 = (uint32_t)0x401; *(uint32_t*)0x2000a6f9 = (uint32_t)0x0; *(uint32_t*)0x2000a6fd = (uint32_t)0x0; *(uint32_t*)0x2000a701 = (uint32_t)0x0; *(uint32_t*)0x2000a705 = (uint32_t)0x0; *(uint32_t*)0x2000a709 = (uint32_t)0x0; *(uint32_t*)0x2000a70d = (uint32_t)0x0; *(uint32_t*)0x2000a711 = (uint32_t)0x0; *(uint32_t*)0x2000a715 = (uint32_t)0x0; *(uint32_t*)0x2000a719 = (uint32_t)0x0; r[71] = syscall(SYS_ioctl, r[3], 0x4070aea0ul, 0x2000a6b9ul, 0, 0, 0); break; case 6: r[72] = syscall(SYS_mmap, 0x2000e000ul, 0x1000ul, 0x3ul, 0x32ul, 0xfffffffffffffffful, 0x0ul); break; case 7: r[73] = syscall(SYS_ioctl, r[2], 0x5424ul, 0x2000e630ul, 0, 0, 0); break; } return 0; } int main() { long i; pthread_t th[8]; srand(getpid()); memset(r, -1, sizeof(r)); for (i = 0; i < 8; i++) { pthread_create(&th[i], 0, thr, (void*)i); usleep(rand()%10000); } for (i = 0; i < 8; i++) pthread_join(th[i], 0); for (i = 0; i < 8; i++) { pthread_create(&th[i], 0, thr, (void*)i); if (rand()%2) usleep(rand()%10000); } for (i = 0; i < 8; i++) pthread_join(th[i], 0); 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
