device syz_tun entered promiscuous mode bridge0: port 3(syz_tun) entered blocking state bridge0: port 3(syz_tun) entered forwarding state ------------[ cut here ]------------ WARNING: CPU: 0 PID: 6313 at net/bridge/br_netfilter_hooks.c:634 br_nf_local_in+0x410/0x488 net/bridge/br_netfilter_hooks.c:634 Modules linked in: CPU: 0 PID: 6313 Comm: syz-executor425 Not tainted 5.15.186-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : br_nf_local_in+0x410/0x488 net/bridge/br_netfilter_hooks.c:634 lr : br_nf_local_in+0x410/0x488 net/bridge/br_netfilter_hooks.c:634 sp : ffff80001f316ad0 x29: ffff80001f316af0 x28: ffff0000dced5610 x27: 1fffe0001b9daac0 x26: 0000000000000000 x25: 1fffe00019282998 x24: dfff800000000000 x23: ffff800012d3c580 x22: ffff0000c9414cc0 x21: ffff0000d3546c80 x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000402 x17: ffff800016cf2000 x16: ffff8000082c0bc8 x15: ffff8000167d2500 x14: ffff0000d5478a00 x13: ffff0000d5478a78 x12: 0000000000ff0100 x11: 0000000000000200 x10: 0000000000000000 x9 : ffff8000103a1de4 x8 : ffff0000d5478000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000010 x2 : 0000000000000008 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: br_nf_local_in+0x410/0x488 net/bridge/br_netfilter_hooks.c:634 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xb4/0x1f4 net/netfilter/core.c:584 nf_hook include/linux/netfilter.h:257 [inline] NF_HOOK+0x224/0x358 include/linux/netfilter.h:300 br_pass_frame_up+0x28c/0x3e8 net/bridge/br_input.c:70 br_handle_frame_finish+0xca4/0xf30 net/bridge/br_input.c:-1 br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:-1 [inline] br_nf_pre_routing_finish+0xfb8/0x1920 net/bridge/br_netfilter_hooks.c:429 NF_HOOK+0x55c/0x5ec include/linux/netfilter.h:302 br_nf_pre_routing+0xaf0/0x1018 net/bridge/br_netfilter_hooks.c:538 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_bridge_pre net/bridge/br_input.c:242 [inline] br_handle_frame+0x70c/0xe70 net/bridge/br_input.c:384 __netif_receive_skb_core+0xce8/0x2e90 net/core/dev.c:5419 __netif_receive_skb_one_core net/core/dev.c:5523 [inline] __netif_receive_skb+0x78/0x2ac net/core/dev.c:5639 netif_receive_skb_internal net/core/dev.c:5725 [inline] netif_receive_skb+0x1cc/0x7e0 net/core/dev.c:5784 tun_rx_batched+0x478/0x5b4 drivers/net/tun.c:-1 tun_get_user+0x1f48/0x31c4 drivers/net/tun.c:1989 tun_chr_write_iter+0xfc/0x20c drivers/net/tun.c:2019 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 701 hardirqs last enabled at (700): [] __local_bh_enable_ip+0x1f8/0x380 kernel/softirq.c:406 hardirqs last disabled at (701): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (636): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31 softirqs last disabled at (638): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18 ---[ end trace 7bdea987f4fa71ff ]---