On Thu, 5 Sep 2019 at 16:53, syzbot <syzbot+dff25ee91f0c7d5c1695@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 3b47fd5c Merge tag 'nfs-for-5.3-4' of git://git.linux-nfs... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=124af12a600000 > kernel config: https://syzkaller.appspot.com/x/.config?x=144488c6c6c6d2b6 > dashboard link: https://syzkaller.appspot.com/bug?extid=dff25ee91f0c7d5c1695 > compiler: clang version 9.0.0 (/home/glider/llvm/clang > 80fee25776c2fb61e74c1ecb1a523375c2500b69) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10954676600000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1752fe0a600000 > > The bug was bisected to: > > commit 0aa67255f54df192d29aec7ac6abb1249d45bda7 > Author: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> > Date: Mon Nov 26 15:47:29 2018 +0000 > > x86/hyper-v: move synic/stimer control structures definitions to > hyperv-tlfs.h > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=156128c1600000 > console output: https://syzkaller.appspot.com/x/log.txt?x=136128c1600000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+dff25ee91f0c7d5c1695@xxxxxxxxxxxxxxxxxxxxxxxxx > Fixes: 0aa67255f54d ("x86/hyper-v: move synic/stimer control structures > definitions to hyperv-tlfs.h") > > kvm [9347]: vcpu0, guest rIP: 0xcc Hyper-V uhandled wrmsr: 0x40000004 data > 0x94 > kvm [9347]: vcpu0, guest rIP: 0xcc Hyper-V uhandled wrmsr: 0x40000004 data > 0x48c > kvm [9347]: vcpu0, guest rIP: 0xcc Hyper-V uhandled wrmsr: 0x40000004 data > 0x4ac > kvm [9347]: vcpu0, guest rIP: 0xcc Hyper-V uhandled wrmsr: 0x40000005 data > 0x1520 > kvm [9347]: vcpu0, guest rIP: 0xcc Hyper-V uhandled wrmsr: 0x40000006 data > 0x15d4 > kvm [9347]: vcpu0, guest rIP: 0xcc Hyper-V uhandled wrmsr: 0x40000007 data > 0x15c4 > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] PREEMPT SMP KASAN > CPU: 0 PID: 9347 Comm: syz-executor665 Not tainted 5.3.0-rc7+ #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:__apic_accept_irq+0x46/0x740 arch/x86/kvm/lapic.c:1029 Thanks for the report, I found the root cause, will send a patch soon. > Code: 89 55 cc 41 89 f4 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 5c c9 5d > 00 48 89 5d c0 4c 8d b3 98 00 00 00 4d 89 f7 49 c1 ef 03 <43> 80 3c 2f 00 > 74 08 4c 89 f7 e8 6b c4 96 00 49 8b 06 48 89 45 d0 > RSP: 0018:ffff88808a30f9b0 EFLAGS: 00010202 > RAX: ffffffff8115c384 RBX: 0000000000000000 RCX: ffff8880977f2140 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffff88808a30fa10 R08: 0000000000000000 R09: 0000000000000000 > R10: ffffed1011461f64 R11: 0000000000000000 R12: 0000000000000000 > R13: dffffc0000000000 R14: 0000000000000098 R15: 0000000000000013 > FS: 0000555555e35880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000000 CR3: 000000008f96d000 CR4: 00000000001426f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > kvm_apic_set_irq+0xb4/0x140 arch/x86/kvm/lapic.c:558 > stimer_notify_direct arch/x86/kvm/hyperv.c:648 [inline] > stimer_expiration arch/x86/kvm/hyperv.c:659 [inline] > kvm_hv_process_stimers+0x594/0x1650 arch/x86/kvm/hyperv.c:686 > vcpu_enter_guest+0x2b2a/0x54b0 arch/x86/kvm/x86.c:7896 > vcpu_run+0x393/0xd40 arch/x86/kvm/x86.c:8152 > kvm_arch_vcpu_ioctl_run+0x636/0x900 arch/x86/kvm/x86.c:8360 > kvm_vcpu_ioctl+0x6cf/0xaf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2765 > do_vfs_ioctl+0x744/0x1730 fs/ioctl.c:46 > ksys_ioctl fs/ioctl.c:713 [inline] > __do_sys_ioctl fs/ioctl.c:720 [inline] > __se_sys_ioctl fs/ioctl.c:718 [inline] > __x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:718 > do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x442a19 > Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 > 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff > ff 0f 83 1b 0c fc ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007ffca3d2a208 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000442a19 > RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 > RBP: 00000000006cd018 R08: 00000000004002c8 R09: 00000000004002c8 > R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000403ac0 > R13: 0000000000403b50 R14: 0000000000000000 R15: 0000000000000000 > Modules linked in: > ---[ end trace 8515c4c18eb55117 ]--- > RIP: 0010:__apic_accept_irq+0x46/0x740 arch/x86/kvm/lapic.c:1029 > Code: 89 55 cc 41 89 f4 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 5c c9 5d > 00 48 89 5d c0 4c 8d b3 98 00 00 00 4d 89 f7 49 c1 ef 03 <43> 80 3c 2f 00 > 74 08 4c 89 f7 e8 6b c4 96 00 49 8b 06 48 89 45 d0 > RSP: 0018:ffff88808a30f9b0 EFLAGS: 00010202 > RAX: ffffffff8115c384 RBX: 0000000000000000 RCX: ffff8880977f2140 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffff88808a30fa10 R08: 0000000000000000 R09: 0000000000000000 > R10: ffffed1011461f64 R11: 0000000000000000 R12: 0000000000000000 > R13: dffffc0000000000 R14: 0000000000000098 R15: 0000000000000013 > FS: 0000555555e35880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000000 CR3: 000000008f96d000 CR4: 00000000001426f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
