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

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Date:   Tue, 9 Mar 2021 07:58:45 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+72d60f48cda58f46375a@...kaller.appspotmail.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] bpf-next boot error: WARNING in kvm_wait

On Sat, Mar 6, 2021 at 8:37 AM syzbot
<syzbot+72d60f48cda58f46375a@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    d01b59c9 bpf: Add bpf_skb_adjust_room flag BPF_F_ADJ_ROOM_..
> git tree:       bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1592bd66d00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=66df2ca4f2dd3022
> dashboard link: https://syzkaller.appspot.com/bug?extid=72d60f48cda58f46375a
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+72d60f48cda58f46375a@...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: 4813 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: 4813 Comm: systemd-cryptse 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: bf ff cc cc cc cc cc cc cc cc cc cc cc 80 3d ca 72 b1 04 00 74 01 c3 48 c7 c7 40 a2 6b 89 c6 05 b9 72 b1 04 01 e8 b8 37 bf 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:ffffc900012dfc40 EFLAGS: 00010282
> RAX: 0000000000000000 RBX: ffffffff8be287a0 RCX: 0000000000000000
> RDX: ffff888023830000 RSI: ffffffff815b6895 RDI: fffff5200025bf7a
> RBP: 0000000000000200 R08: 0000000000000000 R09: 0000000000000001
> R10: ffffffff815af76e R11: 0000000000000000 R12: 0000000000000003
> R13: fffffbfff17c50f4 R14: 0000000000000001 R15: ffff8880b9c35f40
> FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f1b759e04b0 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: 0033:0x7fed7b5d0618
> Code: Unable to access opcode bytes at RIP 0x7fed7b5d05ee.
> RSP: 002b:00007fff094428a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fed7b5d0618
> RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
> RBP: 00007fed7b8ad8e0 R08: 00000000000000e7 R09: fffffffffffffee8
> R10: 00007fed79a8b158 R11: 0000000000000246 R12: 00007fed7b8ad8e0
> R13: 00007fed7b8b2c20 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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