linux-kernel - Re: [syzbot] WARNING in handle_exception

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Message-ID: <0000000000003719fc05e13b37e3@google.com>
Date:   Sun, 12 Jun 2022 00:35:29 -0700
From:   syzbot <syzbot+4688c50a9c8e68e7aaa1@...kaller.appspotmail.com>
To:     bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        jmattson@...gle.com, joro@...tes.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        pbonzini@...hat.com, seanjc@...gle.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        vkuznets@...hat.com, wanpengli@...cent.com, x86@...nel.org
Subject: Re: [syzbot] WARNING in handle_exception_nmi (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    7a68065eb9cd Merge tag 'gpio-fixes-for-v5.19-rc2' of git:/..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=177df408080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=20ac3e0ebf0db3bd
dashboard link: https://syzkaller.appspot.com/bug?extid=4688c50a9c8e68e7aaa1
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12087173f00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16529343f00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4688c50a9c8e68e7aaa1@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 3609 at arch/x86/kvm/vmx/vmx.c:4896 handle_exception_nmi+0xfdc/0x1190 arch/x86/kvm/vmx/vmx.c:4896
Modules linked in:
CPU: 0 PID: 3609 Comm: syz-executor169 Not tainted 5.19.0-rc1-syzkaller-00303-g7a68065eb9cd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:handle_exception_nmi+0xfdc/0x1190 arch/x86/kvm/vmx/vmx.c:4896
Code: 0f 84 c8 f3 ff ff e8 33 5c 58 00 48 89 ef c7 85 84 0d 00 00 00 00 00 00 e8 21 35 ec ff 41 89 c4 e9 af f3 ff ff e8 14 5c 58 00 <0f> 0b e9 69 f6 ff ff e8 08 5c 58 00 be f5 ff ff ff bf 01 00 00 00
RSP: 0018:ffffc9000309faf8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801ba1d880 RSI: ffffffff8122171c RDI: 0000000000000001
RBP: ffff88807cd88000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 00000000a0000975
R13: ffff88807cd88248 R14: 0000000000000000 R15: 0000000080000300
FS:  0000555556c8d300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000229ca000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000b8fecd19 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6174 [inline]
 vmx_handle_exit+0x498/0x1950 arch/x86/kvm/vmx/vmx.c:6191
 vcpu_enter_guest arch/x86/kvm/x86.c:10361 [inline]
 vcpu_run arch/x86/kvm/x86.c:10450 [inline]
 kvm_arch_vcpu_ioctl_run+0x4208/0x66f0 arch/x86/kvm/x86.c:10654
 kvm_vcpu_ioctl+0x570/0xf30 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3944
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f56efaee199
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc37353158 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f56efaee199
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f56efab1bf0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f56efab1c80
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>