This is a printk() flooding problem in bridge driver. Should consider using ratelimit.
#syz set subsystems: net On 2024/10/10 12:27, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: fc20a3e57247 Merge tag 'for-linus-6.12a-rc2-tag' of git://.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1083b380580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ba92623fdea824c9 > dashboard link: https://syzkaller.appspot.com/bug?extid=17bc8c5157022e18da8b > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) > 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=135f7d27980000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1483b380580000 > > Downloadable assets: > disk image: > https://storage.googleapis.com/syzbot-assets/2ad9af7b84b4/disk-fc20a3e5.raw.xz > vmlinux: > https://storage.googleapis.com/syzbot-assets/1afa462ca485/vmlinux-fc20a3e5.xz > kernel image: > https://storage.googleapis.com/syzbot-assets/75c0900b4786/bzImage-fc20a3e5.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+17bc8c5157022e18d...@syzkaller.appspotmail.com > > bridge0: received packet on veth0_to_bridge with own address as source > address (addr:aa:aa:aa:aa:aa:0c, vlan:0) > rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: > rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5244/1:b..l > rcu: (detected by 1, t=10503 jiffies, g=5253, q=1466 ncpus=2) > task:syz-executor116 state:R running task stack:18800 pid:5244 > tgid:5244 ppid:5243 flags:0x00000002 (...snipped...) > net_ratelimit: 33488 callbacks suppressed > bridge0: received packet on veth0_to_bridge with own address as source > address (addr:aa:aa:aa:aa:aa:0c, vlan:0) > bridge0: received packet on veth0_to_bridge with own address as source > address (addr:aa:aa:aa:aa:aa:0c, vlan:0) > bridge0: received packet on bridge_slave_0 with own address as source address > (addr:aa:aa:aa:aa:aa:0c, vlan:0) > bridge0: received packet on bridge_slave_0 with own address as source address > (addr:aa:aa:aa:aa:aa:0c, vlan:0) > bridge0: received packet on veth0_to_bridge with own address as source > address (addr:aa:aa:aa:aa:aa:0c, vlan:0) > bridge0: received packet on veth0_to_bridge with own address as source > address (addr:aa:aa:aa:aa:aa:0c, vlan:0) > bridge0: received packet on bridge_slave_0 with own address as source address > (addr:aa:aa:aa:aa:aa:0c, vlan:0) > bridge0: received packet on bridge_slave_0 with own address as source address > (addr:aa:aa:aa:aa:aa:0c, vlan:0) > bridge0: received packet on veth0_to_bridge with own address as source > address (addr:aa:aa:aa:aa:aa:0c, vlan:0) > bridge0: received packet on veth0_to_bridge with own address as source > address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
