bridge0: received packet on veth0_to_bridge with own address as source address (addr:c6:cc:ce:09:2a:fa, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P23731/1:b..l rcu: (detected by 1, t=10503 jiffies, g=100113, q=2460 ncpus=2) task:syz.1.4936 state:R running task stack:22656 pid:23731 tgid:23730 ppid:17225 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x15dd/0x52d0 kernel/sched/core.c:6908 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7235 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0xa4/0x2e0 kernel/locking/lockdep.c:5844 Code: 3d 00 47 70 0e 00 0f 84 c1 00 00 00 65 8b 05 e3 b1 7a 11 85 c0 0f 85 b2 00 00 00 65 48 8b 05 2b 6c 7a 11 83 b8 54 0b 00 00 00 <0f> 85 9d 00 00 00 9c 5b fa 48 c7 c7 ff d2 f0 8d e8 c7 69 0c 0a 65 RSP: 0018:ffffc900064f7808 EFLAGS: 00000246 RAX: ffff888029241e80 RBX: ffffffff826f248c RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff826f24a8 RDI: 1ffffffff1cec05c RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed1012371969 R12: 0000000000000002 R13: ffffffff8e7602e0 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [inline] kernfs_root+0x38/0x230 fs/kernfs/kernfs-internal.h:75 kernfs_next_descendant_post+0x4e/0x310 fs/kernfs/dir.c:1378 __kernfs_remove+0x1f0/0x660 fs/kernfs/dir.c:1495 kernfs_remove_by_name_ns+0xaf/0x130 fs/kernfs/dir.c:1722 kernfs_remove_by_name include/linux/kernfs.h:633 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0xfc/0x2e0 fs/sysfs/group.c:328 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:352 destroy_gid_attrs drivers/infiniband/core/sysfs.c:1138 [inline] ib_free_port_attrs+0xc5/0x3b0 drivers/infiniband/core/sysfs.c:1362 remove_one_compat_dev drivers/infiniband/core/device.c:1010 [inline] rdma_dev_exit_net+0x1de/0x350 drivers/infiniband/core/device.c:1148 ops_exit_list net/core/net_namespace.c:199 [inline] ops_undo_list+0x49f/0x940 net/core/net_namespace.c:252 setup_net+0x2f0/0x340 net/core/net_namespace.c:462 copy_net_ns+0x50e/0x730 net/core/net_namespace.c:581 create_new_namespaces+0x3e7/0x6a0 kernel/nsproxy.c:130 unshare_nsproxy_namespaces+0x11a/0x160 kernel/nsproxy.c:226 ksys_unshare+0x51d/0x930 kernel/fork.c:3174 __do_sys_unshare kernel/fork.c:3245 [inline] __se_sys_unshare kernel/fork.c:3243 [inline] __x64_sys_unshare+0x38/0x50 kernel/fork.c:3243 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4a7b59c799 RSP: 002b:00007f4a7c471028 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f4a7b815fa0 RCX: 00007f4a7b59c799 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000 RBP: 00007f4a7b632c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4a7b816038 R14: 00007f4a7b815fa0 R15: 00007fffdf65a8c8 bridge0: received packet on veth0_to_bridge with own address as source address (addr:c6:cc:ce:09:2a:fa, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c6:cc:ce:09:2a:fa, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c6:cc:ce:09:2a:fa, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c6:cc:ce:09:2a:fa, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c6:cc:ce:09:2a:fa, vlan:0) net_ratelimit: 16607 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:c6:cc:ce:09:2a:fa, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c6:cc:ce:09:2a:fa, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c6:cc:ce:09:2a:fa, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c6:cc:ce:09:2a:fa, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:c6:cc:ce:09:2a:fa, vlan:0)