Martin KaFai Lau <kafai@xxxxxx> writes: > On Thu, Mar 10, 2022 at 10:37:20AM -0800, syzbot wrote: >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: de55c9a1967c Merge branch 'Add support for transmitting pa.. >> git tree: bpf-next >> console output: https://syzkaller.appspot.com/x/log.txt?x=14ce88ad700000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=2fa13781bcea50fc >> dashboard link: https://syzkaller.appspot.com/bug?extid=0e91362d99386dc5de99 >> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11f36345700000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14c8ca65700000 >> >> The issue was bisected to: >> >> commit b530e9e1063ed2b817eae7eec6ed2daa8be11608 >> Author: Toke Høiland-Jørgensen <toke@xxxxxxxxxx> >> Date: Wed Mar 9 10:53:42 2022 +0000 >> >> bpf: Add "live packet" mode for XDP in BPF_PROG_RUN >> >> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17696e55700000 >> final oops: https://syzkaller.appspot.com/x/report.txt?x=14e96e55700000 >> console output: https://syzkaller.appspot.com/x/log.txt?x=10e96e55700000 >> >> IMPORTANT: if you fix the issue, please add the following tag to the commit: >> Reported-by: syzbot+0e91362d99386dc5de99@xxxxxxxxxxxxxxxxxxxxxxxxx >> Fixes: b530e9e1063e ("bpf: Add "live packet" mode for XDP in BPF_PROG_RUN") >> >> ------------[ cut here ]------------ >> XDP_WARN: xdp_update_frame_from_buff(line:274): Driver BUG: missing reserved tailroom >> WARNING: CPU: 0 PID: 3590 at net/core/xdp.c:599 xdp_warn+0x28/0x30 net/core/xdp.c:599 > Toke, please take a look. Right, I see the problem; will send a fix! -Toke
