linux-kernel - Re: [syzbot] bpf boot error: WARNING in kvm

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Date:   Tue, 9 Mar 2021 07:57:57 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+46fc491326a456ff8127@...kaller.appspotmail.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] bpf boot error: WARNING in kvm_wait

On Sat, Mar 6, 2021 at 12:28 PM syzbot
<syzbot+46fc491326a456ff8127@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    edbea922 veth: Store queue_mapping independently of XDP pr..
> git tree:       bpf
> console output: https://syzkaller.appspot.com/x/log.txt?x=113ae02ad00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=402784bff477e1ac
> dashboard link: https://syzkaller.appspot.com/bug?extid=46fc491326a456ff8127
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+46fc491326a456ff8127@...kaller.appspotmail.com

#syz dup: upstream boot error: WARNING in kvm_wait

> ------------[ cut here ]------------
> raw_local_irq_restore() called with IRQs enabled
> WARNING: CPU: 0 PID: 4787 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10
> Modules linked in:
> CPU: 0 PID: 4787 Comm: systemd-getty-g Not tainted 5.11.0-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10
> Code: be ff cc cc cc cc cc cc cc cc cc cc cc 80 3d 1e 62 b0 04 00 74 01 c3 48 c7 c7 a0 8e 6b 89 c6 05 0d 62 b0 04 01 e8 57 da be ff <0f> 0b c3 48 39 77 10 0f 84 97 00 00 00 66 f7 47 22 f0 ff 74 4b 48
> RSP: 0018:ffffc900012efc40 EFLAGS: 00010282
> RAX: 0000000000000000 RBX: ffffffff8be28b80 RCX: 0000000000000000
> RDX: ffff888023de5340 RSI: ffffffff815bea35 RDI: fffff5200025df7a
> RBP: 0000000000000200 R08: 0000000000000000 R09: 0000000000000001
> R10: ffffffff815b77be R11: 0000000000000000 R12: 0000000000000003
> R13: fffffbfff17c5170 R14: 0000000000000001 R15: ffff8880b9c35f40
> FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fa257bcaab4 CR3: 000000000bc8e000 CR4: 00000000001506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  kvm_wait arch/x86/kernel/kvm.c:860 [inline]
>  kvm_wait+0xc9/0xe0 arch/x86/kernel/kvm.c:837
>  pv_wait arch/x86/include/asm/paravirt.h:564 [inline]
>  pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
>  __pv_queued_spin_lock_slowpath+0x8b8/0xb40 kernel/locking/qspinlock.c:508
>  pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [inline]
>  queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
>  queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
>  do_raw_spin_lock+0x200/0x2b0 kernel/locking/spinlock_debug.c:113
>  spin_lock include/linux/spinlock.h:354 [inline]
>  check_stack_usage kernel/exit.c:715 [inline]
>  do_exit+0x1d6a/0x2ae0 kernel/exit.c:868
>  do_group_exit+0x125/0x310 kernel/exit.c:922
>  __do_sys_exit_group kernel/exit.c:933 [inline]
>  __se_sys_exit_group kernel/exit.c:931 [inline]
>  __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
>  do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
>  entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x7fa2592a3618
> Code: Unable to access opcode bytes at RIP 0x7fa2592a35ee.
> RSP: 002b:00007ffc579980b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa2592a3618
> RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
> RBP: 00007fa2595808e0 R08: 00000000000000e7 R09: fffffffffffffee8
> R10: 00007fa25775e158 R11: 0000000000000246 R12: 00007fa2595808e0
> R13: 00007fa259585c20 R14: 0000000000000000 R15: 0000000000000000
>
>
> ---
> This report 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@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
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