linux-kernel - Re: [syzbot] possible deadlock in io_sq_thread

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Message-ID: <000000000000c94d8605bf7b4135@google.com>
Date:   Thu, 08 Apr 2021 12:43:09 -0700
From:   syzbot <syzbot+ac39856cb1b332dbbdda@...kaller.appspotmail.com>
To:     asml.silence@...il.com, axboe@...nel.dk, bp@...en8.de,
        hdanton@...a.com, hpa@...or.com, io-uring@...r.kernel.org,
        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] possible deadlock in io_sq_thread_finish

syzbot suspects this issue was fixed by commit:

commit f4e61f0c9add3b00bd5f2df3c814d688849b8707
Author: Wanpeng Li <wanpengli@...cent.com>
Date:   Mon Mar 15 06:55:28 2021 +0000

    x86/kvm: Fix broken irq restoration in kvm_wait

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1022d7aad00000
start commit:   144c79ef Merge tag 'perf-tools-fixes-for-v5.12-2020-03-07'..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=db9c6adb4986f2f2
dashboard link: https://syzkaller.appspot.com/bug?extid=ac39856cb1b332dbbdda
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=167574dad00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12c8f566d00000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: x86/kvm: Fix broken irq restoration in kvm_wait

For information about bisection process see: https://goo.gl/tpsmEJ#bisection