netdevsim netdevsim4 netdevsim0: renamed from eth0
==================================================================
BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff8688c358 of 8 bytes by task 23083 on cpu 1:
 data_alloc+0x31c/0x390 kernel/printk/printk_ringbuffer.c:1130
 prb_reserve+0x964/0xb60 kernel/printk/printk_ringbuffer.c:1724
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2302
 vprintk_emit+0x15a/0x610 kernel/printk/printk.c:2402
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2441
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2451
 ib_get_eth_speed+0x33d/0x4b0 drivers/infiniband/core/verbs.c:2006
 siw_query_port+0x3a/0x2d0 drivers/infiniband/sw/siw/siw_verbs.c:179
 iw_query_port drivers/infiniband/core/device.c:2137 [inline]
 ib_query_port+0x393/0x3d0 drivers/infiniband/core/device.c:2178
 ib_setup_port_attrs+0x14a/0x1430 drivers/infiniband/core/sysfs.c:1429
 add_one_compat_dev+0x261/0x360 drivers/infiniband/core/device.c:1005
 rdma_dev_init_net+0x182/0x210 drivers/infiniband/core/device.c:1221
 ops_init+0x22a/0x2e0 net/core/net_namespace.c:137
 setup_net+0x95/0x220 net/core/net_namespace.c:446
 copy_net_ns+0x309/0x460 net/core/net_namespace.c:581
 create_new_namespaces+0x20e/0x400 kernel/nsproxy.c:130
 copy_namespaces+0x1ad/0x210 kernel/nsproxy.c:195
 copy_process+0xce4/0x1ef0 kernel/fork.c:2181
 kernel_clone+0x16c/0x5c0 kernel/fork.c:2608
 __do_sys_clone kernel/fork.c:2749 [inline]
 __se_sys_clone kernel/fork.c:2733 [inline]
 __x64_sys_clone+0xe6/0x120 kernel/fork.c:2733
 x64_sys_call+0x12d0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8688c358 of 8 bytes by task 22946 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:496 [inline]
 desc_push_tail kernel/printk/printk_ringbuffer.c:792 [inline]
 desc_reserve kernel/printk/printk_ringbuffer.c:938 [inline]
 prb_reserve+0x249/0xb60 kernel/printk/printk_ringbuffer.c:1674
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2302
 vprintk_emit+0x15a/0x610 kernel/printk/printk.c:2402
 dev_vprintk_emit+0x242/0x2a0 drivers/base/core.c:4914
 dev_printk_emit+0x84/0xb0 drivers/base/core.c:4925
 __netdev_printk+0x34b/0x370 net/core/dev.c:12901
 netdev_info+0x9b/0xd0 net/core/dev.c:12956
 netif_change_name+0x6af/0x720 net/core/dev.c:1466
 do_setlink+0x710/0x2780 net/core/rtnetlink.c:3138
 rtnl_changelink net/core/rtnetlink.c:3776 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3935 [inline]
 rtnl_newlink+0xea4/0x1360 net/core/rtnetlink.c:4072
 rtnetlink_rcv_msg+0x5fe/0x6d0 net/core/rtnetlink.c:6958
 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6985
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x145/0x180 net/socket.c:733
 __sys_sendto+0x268/0x330 net/socket.c:2197
 __do_sys_sendto net/socket.c:2204 [inline]
 __se_sys_sendto net/socket.c:2200 [inline]
 __x64_sys_sendto+0x76/0x90 net/socket.c:2200
 x64_sys_call+0x29a7/0x3000 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000000eebd8 -> 0x0000000000191c70

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 22946 Comm: syz-executor Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
==================================================================
netdevsim netdevsim4 netdevsim1: renamed from eth1
netdevsim netdevsim4 netdevsim2: renamed from eth2
netdevsim netdevsim4 netdevsim3: renamed from eth3
8021q: adding VLAN 0 to HW filter on device bond0
8021q: adding VLAN 0 to HW filter on device team0
hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network
hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network