bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P17884/1:b..l rcu: (detected by 0, t=10503 jiffies, g=62869, q=1486 ncpus=2) task:syz.7.3353 state:R running task stack:25224 pid:17884 tgid:17883 ppid:13926 task_flags:0x400140 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 7b 41 03 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc9000bb5f7e8 EFLAGS: 00000206 RAX: f4ba2a441ffde700 RBX: 0000000000000000 RCX: f4ba2a441ffde700 RDX: 0000000000000000 RSI: ffffffff8dba926d RDI: ffffffff8be33c00 RBP: ffffffff825d5c2c R08: 0000000000000000 R09: ffffffff825d5c2c R10: dffffc0000000000 R11: ffffed100f90a8b5 R12: 0000000000000002 R13: ffffffff8e13a0e0 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] kernfs_root+0x38/0x230 fs/kernfs/kernfs-internal.h:75 kernfs_root_is_locked fs/kernfs/kernfs-internal.h:109 [inline] kernfs_parent+0x51/0x190 fs/kernfs/kernfs-internal.h:133 __kernfs_remove+0x343/0x570 fs/kernfs/dir.c:1509 kernfs_remove_by_name_ns+0xaf/0x130 fs/kernfs/dir.c:1717 kernfs_remove_by_name include/linux/kernfs.h:633 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0xfc/0x2c0 fs/sysfs/group.c:322 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:346 destroy_gid_attrs drivers/infiniband/core/sysfs.c:1182 [inline] ib_free_port_attrs+0xc5/0x3b0 drivers/infiniband/core/sysfs.c:1407 remove_one_compat_dev drivers/infiniband/core/device.c:1038 [inline] rdma_dev_exit_net+0x1d8/0x340 drivers/infiniband/core/device.c:1176 ops_exit_list net/core/net_namespace.c:198 [inline] ops_undo_list+0x49a/0x990 net/core/net_namespace.c:251 setup_net+0x2d3/0x320 net/core/net_namespace.c:453 copy_net_ns+0x31b/0x4d0 net/core/net_namespace.c:570 create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:218 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3127 __do_sys_unshare kernel/fork.c:3198 [inline] __se_sys_unshare kernel/fork.c:3196 [inline] __x64_sys_unshare+0x38/0x50 kernel/fork.c:3196 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f72e398eba9 RSP: 002b:00007f72e48fa038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f72e3bd5fa0 RCX: 00007f72e398eba9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000 RBP: 00007f72e3a11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f72e3bd6038 R14: 00007f72e3bd5fa0 R15: 00007ffc60927978 net_ratelimit: 16912 callbacks suppressed 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 bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, 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:9e:c9:e0:81:43:0e, vlan:0) net_ratelimit: 18468 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:9e:c9:e0:81:43:0e, 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 bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)