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

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Date:   Thu, 1 Apr 2021 15:05:00 -0700
From:   Yonghong Song <yhs@...com>
To:     syzbot <syzbot+774c590240616eaa3423@...kaller.appspotmail.com>,
        <akpm@...ux-foundation.org>, <andrii@...nel.org>, <ast@...nel.org>,
        <bp@...en8.de>, <bpf@...r.kernel.org>, <daniel@...earbox.net>,
        <davem@...emloft.net>, <hawk@...nel.org>, <hpa@...or.com>,
        <jmattson@...gle.com>, <john.fastabend@...il.com>,
        <joro@...tes.org>, <kafai@...com>, <kpsingh@...nel.org>,
        <kuba@...nel.org>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <mark.rutland@....com>,
        <masahiroy@...nel.org>, <mingo@...hat.com>,
        <netdev@...r.kernel.org>, <pbonzini@...hat.com>,
        <peterz@...radead.org>, <rafael.j.wysocki@...el.com>,
        <rostedt@...dmis.org>, <seanjc@...gle.com>,
        <songliubraving@...com>, <syzkaller-bugs@...glegroups.com>,
        <tglx@...utronix.de>, <vkuznets@...hat.com>,
        <wanpengli@...cent.com>, <will@...nel.org>, <x86@...nel.org>
Subject: Re: [syzbot] WARNING in bpf_test_run



On 4/1/21 4:29 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    36e79851 libbpf: Preserve empty DATASEC BTFs during static..
> git tree:       bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1569bb06d00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7eff0f22b8563a5f
> dashboard link: https://syzkaller.appspot.com/bug?extid=774c590240616eaa3423
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17556b7cd00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1772be26d00000
> 
> The issue was bisected to:
> 
> commit 997acaf6b4b59c6a9c259740312a69ea549cc684
> Author: Mark Rutland <mark.rutland@....com>
> Date:   Mon Jan 11 15:37:07 2021 +0000
> 
>      lockdep: report broken irq restoration
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10197016d00000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=12197016d00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=14197016d00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+774c590240616eaa3423@...kaller.appspotmail.com
> Fixes: 997acaf6b4b5 ("lockdep: report broken irq restoration")
> 
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 8725 at include/linux/bpf-cgroup.h:193 bpf_cgroup_storage_set include/linux/bpf-cgroup.h:193 [inline]
> WARNING: CPU: 0 PID: 8725 at include/linux/bpf-cgroup.h:193 bpf_test_run+0x65e/0xaa0 net/bpf/test_run.c:109

I will look at this issue. Thanks!

> Modules linked in:
> CPU: 0 PID: 8725 Comm: syz-executor927 Not tainted 5.12.0-rc4-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:bpf_cgroup_storage_set include/linux/bpf-cgroup.h:193 [inline]
> RIP: 0010:bpf_test_run+0x65e/0xaa0 net/bpf/test_run.c:109
> Code: e9 29 fe ff ff e8 b2 9d 3a fa 41 83 c6 01 bf 08 00 00 00 44 89 f6 e8 51 a5 3a fa 41 83 fe 08 0f 85 74 fc ff ff e8 92 9d 3a fa <0f> 0b bd f0 ff ff ff e9 5c fd ff ff e8 81 9d 3a fa 83 c5 01 bf 08
> RSP: 0018:ffffc900017bfaf0 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffffc90000f29000 RCX: 0000000000000000
> RDX: ffff88801bc68000 RSI: ffffffff8739543e RDI: 0000000000000003
> RBP: 0000000000000007 R08: 0000000000000008 R09: 0000000000000001
> R10: ffffffff8739542f R11: 0000000000000000 R12: dffffc0000000000
> R13: ffff888021dd54c0 R14: 0000000000000008 R15: 0000000000000000
> FS:  00007f00157d7700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f0015795718 CR3: 00000000157ae000 CR4: 00000000001506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   bpf_prog_test_run_skb+0xabc/0x1c70 net/bpf/test_run.c:628
>   bpf_prog_test_run kernel/bpf/syscall.c:3132 [inline]
>   __do_sys_bpf+0x218b/0x4f40 kernel/bpf/syscall.c:4411
>   do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
>   entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x446199
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f00157d72f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
> RAX: ffffffffffffffda RBX: 00000000004cb440 RCX: 0000000000446199
> RDX: 0000000000000028 RSI: 0000000020000080 RDI: 000000000000000a
> RBP: 000000000049b074 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: f9abde7200f522cd
> R13: 3952ddf3af240c07 R14: 1631e0d82d3fa99d R15: 00000000004cb448
> 
> 
> ---
> 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.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>