On Thu, Feb 25, 2016 at 11:47 PM, Steve Rutherford <srutherford@xxxxxxxxxx> wrote: > Hey Dmitry, > > I ran this against 4.5 rc3 and couldn't get a crash on bare metal (overnight > one machine bunch of processes looping). Are you running these tests with > nested? Yes, I run it in qemu (host has Intel processor). > On Mon, Feb 15, 2016 at 5:50 AM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: >> >> 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
