* general protection fault in __apic_accept_irq
@ 2019-09-05 8:28 syzbot
2019-09-05 9:25 ` Wanpeng Li
0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2019-09-05 8:28 UTC (permalink / raw)
To: bp, devel, haiyangz, hpa, jmattson, joro, kvm, kys, linux-kernel,
mikelley, mingo, pbonzini, rkrcmar, sashal,
sean.j.christopherson, sthemmin, syzkaller-bugs, tglx, vkuznets,
wanpengli, x86
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@redhat.com>
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@syzkaller.appspotmail.com
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
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@googlegroups.com.
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
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: general protection fault in __apic_accept_irq
2019-09-05 8:28 general protection fault in __apic_accept_irq syzbot
@ 2019-09-05 9:25 ` Wanpeng Li
2019-09-05 13:11 ` Vitaly Kuznetsov
0 siblings, 1 reply; 4+ messages in thread
From: Wanpeng Li @ 2019-09-05 9:25 UTC (permalink / raw)
To: syzbot
Cc: Borislav Petkov, devel, Haiyang Zhang, H. Peter Anvin,
Jim Mattson, Joerg Roedel, kvm, K. Y. Srinivasan, LKML, mikelley,
Ingo Molnar, Paolo Bonzini, Radim Krcmar, Sasha Levin,
Sean Christopherson, Stephen Hemminger, syzkaller-bugs,
Thomas Gleixner, Vitaly Kuznetsov, Wanpeng Li,
the arch/x86 maintainers
On Thu, 5 Sep 2019 at 16:53, syzbot
<syzbot+dff25ee91f0c7d5c1695@syzkaller.appspotmail.com> 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@redhat.com>
> 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@syzkaller.appspotmail.com
> 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@googlegroups.com.
>
> 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
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: general protection fault in __apic_accept_irq
2019-09-05 9:25 ` Wanpeng Li
@ 2019-09-05 13:11 ` Vitaly Kuznetsov
2019-09-06 3:41 ` Wanpeng Li
0 siblings, 1 reply; 4+ messages in thread
From: Vitaly Kuznetsov @ 2019-09-05 13:11 UTC (permalink / raw)
To: Wanpeng Li, syzbot
Cc: Borislav Petkov, devel, Haiyang Zhang, H. Peter Anvin,
Jim Mattson, Joerg Roedel, kvm, K. Y. Srinivasan, LKML, mikelley,
Ingo Molnar, Paolo Bonzini, Radim Krcmar, Sasha Levin,
Sean Christopherson, Stephen Hemminger, syzkaller-bugs,
Thomas Gleixner, Wanpeng Li, the arch/x86 maintainers
Wanpeng Li <kernellwp@gmail.com> writes:
> On Thu, 5 Sep 2019 at 16:53, syzbot
> <syzbot+dff25ee91f0c7d5c1695@syzkaller.appspotmail.com> 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@redhat.com>
>> 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@syzkaller.appspotmail.com
>> 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.
>
I'm really interested in how any issue can be caused by 0aa67255f54d as
we just moved some definitions from a c file to a common header... (ok,
we did more than that, some structures gained '__packed' but it all
still seems legitimate to me and I can't recall any problems with
genuine Hyper-V...)
--
Vitaly
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: general protection fault in __apic_accept_irq
2019-09-05 13:11 ` Vitaly Kuznetsov
@ 2019-09-06 3:41 ` Wanpeng Li
0 siblings, 0 replies; 4+ messages in thread
From: Wanpeng Li @ 2019-09-06 3:41 UTC (permalink / raw)
To: Vitaly Kuznetsov
Cc: syzbot, Borislav Petkov, devel, Haiyang Zhang, H. Peter Anvin,
Jim Mattson, Joerg Roedel, kvm, K. Y. Srinivasan, LKML, mikelley,
Ingo Molnar, Paolo Bonzini, Radim Krcmar, Sasha Levin,
Sean Christopherson, Stephen Hemminger, syzkaller-bugs,
Thomas Gleixner, Wanpeng Li, the arch/x86 maintainers
On Thu, 5 Sep 2019 at 21:11, Vitaly Kuznetsov <vkuznets@redhat.com> wrote:
>
> Wanpeng Li <kernellwp@gmail.com> writes:
>
> > On Thu, 5 Sep 2019 at 16:53, syzbot
> > <syzbot+dff25ee91f0c7d5c1695@syzkaller.appspotmail.com> 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@redhat.com>
> >> 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@syzkaller.appspotmail.com
> >> 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.
> >
>
> I'm really interested in how any issue can be caused by 0aa67255f54d as
> we just moved some definitions from a c file to a common header... (ok,
> we did more than that, some structures gained '__packed' but it all
> still seems legitimate to me and I can't recall any problems with
> genuine Hyper-V...)
Yes, the bisect is false positive, we can focus on fixing the bug.
Wanpeng
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2019-09-06 3:41 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-09-05 8:28 general protection fault in __apic_accept_irq syzbot
2019-09-05 9:25 ` Wanpeng Li
2019-09-05 13:11 ` Vitaly Kuznetsov
2019-09-06 3:41 ` Wanpeng Li
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