linux-kernel - RE: [syzbot] [net?] WARNING in tcp_recvmsg

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Message-ID: <656f6e2050d_2df272086c@john.notmuch>
Date:   Tue, 05 Dec 2023 10:38:24 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     syzbot <syzbot+06dbd397158ec0ea4983@...kaller.appspotmail.com>,
        andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        cong.wang@...edance.com, daniel@...earbox.net, davem@...emloft.net,
        dsahern@...nel.org, edumazet@...gle.com, john.fastabend@...il.com,
        kafai@...com, kpsingh@...nel.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        nathan@...nel.org, ndesaulniers@...gle.com, netdev@...r.kernel.org,
        pabeni@...hat.com, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, trix@...hat.com, yhs@...com,
        yoshfuji@...ux-ipv6.org
Subject: RE: [syzbot] [net?] WARNING in tcp_recvmsg_locked (2)

syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    8470e4368b0f Merge branch 'net-cacheline-optimizations'
> git tree:       net-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=12094286e80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f8715b6ede5c4b90
> dashboard link: https://syzkaller.appspot.com/bug?extid=06dbd397158ec0ea4983
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1247bee2e80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1285243ce80000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/90007d08e178/disk-8470e436.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/b55270de1cdc/vmlinux-8470e436.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/2237d34b6fec/bzImage-8470e436.xz
> 
> The issue was bisected to:
> 
> commit 965b57b469a589d64d81b1688b38dcb537011bb0
> Author: Cong Wang <cong.wang@...edance.com>
> Date:   Wed Jun 15 16:20:12 2022 +0000
> 
>     net: Introduce a new proto_ops ->read_skb()
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1087c0d4e80000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=1287c0d4e80000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1487c0d4e80000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+06dbd397158ec0ea4983@...kaller.appspotmail.com
> Fixes: 965b57b469a5 ("net: Introduce a new proto_ops ->read_skb()")
> 
> WARNING: CPU: 1 PID: 5130 at net/ipv4/tcp.c:2396 tcp_recvmsg_locked+0xa54/0x2490 net/ipv4/tcp.c:2396

I'll take a look. Thanks.