bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
==================================================================
BUG: KCSAN: data-race in rwsem_down_write_slowpath / rwsem_down_write_slowpath

write to 0xffffc90001d1b1d8 of 1 bytes by task 30642 on cpu 0:
 rwsem_try_write_lock kernel/locking/rwsem.c:676 [inline]
 rwsem_down_write_slowpath+0x3fd/0xb10 kernel/locking/rwsem.c:1189
 __down_write_common kernel/locking/rwsem.c:1347 [inline]
 __down_write kernel/locking/rwsem.c:1356 [inline]
 down_write+0xa8/0xc0 kernel/locking/rwsem.c:1632
 kernfs_add_one+0x5a/0x310 fs/kernfs/dir.c:833
 __kernfs_create_file+0x145/0x180 fs/kernfs/file.c:1100
 sysfs_add_file_mode_ns+0x132/0x1b0 fs/sysfs/file.c:316
 create_files fs/sysfs/group.c:82 [inline]
 internal_create_group+0x43e/0x9e0 fs/sysfs/group.c:189
 internal_create_groups fs/sysfs/group.c:229 [inline]
 sysfs_create_groups+0x3f/0xf0 fs/sysfs/group.c:255
 setup_gid_attrs drivers/infiniband/core/sysfs.c:1123 [inline]
 ib_setup_port_attrs+0xeda/0x14a0 drivers/infiniband/core/sysfs.c:1399
 add_one_compat_dev+0x25c/0x360 drivers/infiniband/core/device.c:1002
 rdma_dev_init_net+0x17d/0x210 drivers/infiniband/core/device.c:1227
 ops_init+0x22a/0x2e0 net/core/net_namespace.c:137
 setup_net+0x9f/0x230 net/core/net_namespace.c:443
 copy_net_ns+0x339/0x490 net/core/net_namespace.c:584
 create_new_namespaces+0x1f6/0x420 kernel/nsproxy.c:132
 unshare_nsproxy_namespaces+0x115/0x150 kernel/nsproxy.c:234
 ksys_unshare+0x3a3/0x690 kernel/fork.c:3298
 __do_sys_unshare kernel/fork.c:3364 [inline]
 __se_sys_unshare kernel/fork.c:3362 [inline]
 __x64_sys_unshare+0x1f/0x30 kernel/fork.c:3362
 x64_sys_call+0x1e33/0x2550 arch/x86/include/generated/asm/syscalls_64.h:273
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffc90001d1b1d8 of 1 bytes by task 30591 on cpu 1:
 rwsem_down_write_slowpath+0x473/0xb10 kernel/locking/rwsem.c:1207
 __down_write_common kernel/locking/rwsem.c:1347 [inline]
 __down_write kernel/locking/rwsem.c:1356 [inline]
 down_write+0xa8/0xc0 kernel/locking/rwsem.c:1632
 kernfs_add_one+0x5a/0x310 fs/kernfs/dir.c:833
 __kernfs_create_file+0x145/0x180 fs/kernfs/file.c:1100
 sysfs_add_file_mode_ns+0x132/0x1b0 fs/sysfs/file.c:316
 sysfs_merge_group+0xed/0x1c0 fs/sysfs/group.c:382
 dpm_sysfs_add+0xaf/0x1e0 drivers/base/power/sysfs.c:704
 device_add+0x3bc/0x790 drivers/base/core.c:3723
 netdev_register_kobject+0x127/0x240 net/core/net-sysfs.c:2381
 register_netdevice+0xc68/0x13f0 net/core/dev.c:11701
 veth_newlink+0x4a1/0x9b0 drivers/net/veth.c:1906
 rtnl_newlink_create+0x1e4/0x4a0 net/core/rtnetlink.c:4006
 __rtnl_newlink net/core/rtnetlink.c:4135 [inline]
 rtnl_newlink+0x1255/0x1510 net/core/rtnetlink.c:4252
 rtnetlink_rcv_msg+0x64b/0x720 net/core/rtnetlink.c:7169
 netlink_rcv_skb+0x11e/0x220 net/netlink/af_netlink.c:2584
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:7196
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x665/0x740 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x5ef/0x740 net/netlink/af_netlink.c:1920
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:818 [inline]
 __sys_sendto+0x429/0x480 net/socket.c:2283
 __do_sys_sendto net/socket.c:2290 [inline]
 __se_sys_sendto net/socket.c:2286 [inline]
 __x64_sys_sendto+0x76/0x90 net/socket.c:2286
 x64_sys_call+0x200c/0x2550 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 30591 Comm: syz-executor Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
==================================================================
team0: Port device team_slave_0 added
team0: Port device team_slave_1 added
batman_adv: batadv0: Adding interface: batadv_slave_0
batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
batman_adv: batadv0: Adding interface: batadv_slave_1
batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
hsr_slave_0: entered promiscuous mode
hsr_slave_1: entered promiscuous mode
debugfs: 'hsr0' already exists in 'hsr'
Cannot create hsr debugfs directory
netdevsim netdevsim9 netdevsim0: renamed from eth0
8021q: adding VLAN 0 to HW filter on device netdevsim0
netdevsim netdevsim9 netdevsim1: renamed from eth1
8021q: adding VLAN 0 to HW filter on device netdevsim1
netdevsim netdevsim9 netdevsim2: renamed from eth2
8021q: adding VLAN 0 to HW filter on device netdevsim2
netdevsim netdevsim9 netdevsim3: renamed from eth3
8021q: adding VLAN 0 to HW filter on device netdevsim3
8021q: adding VLAN 0 to HW filter on device bond0
8021q: adding VLAN 0 to HW filter on device team0
8021q: adding VLAN 0 to HW filter on device batadv0
veth0_vlan: entered promiscuous mode
veth1_vlan: entered promiscuous mode
veth0_macvtap: entered promiscuous mode
veth1_macvtap: entered promiscuous mode
batman_adv: batadv0: Interface activated: batadv_slave_0
batman_adv: batadv0: Interface activated: batadv_slave_1