BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff8668a528 of 8 bytes by task 19458 on cpu 1:
 data_alloc+0x291/0x2c0 kernel/printk/printk_ringbuffer.c:1096
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
 show_trace_log_lvl+0x380/0x400 arch/x86/kernel/dumpstack.c:285
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xf2/0x150 lib/dump_stack.c:120
 dump_stack+0x15/0x1a lib/dump_stack.c:129
 fail_dump lib/fault-inject.c:53 [inline]
 should_fail_ex+0x223/0x230 lib/fault-inject.c:154
 should_failslab+0x8f/0xb0 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4072 [inline]
 slab_alloc_node mm/slub.c:4148 [inline]
 kmem_cache_alloc_node_noprof+0x59/0x320 mm/slub.c:4220
 __alloc_skb+0x10b/0x310 net/core/skbuff.c:668
 alloc_skb include/linux/skbuff.h:1331 [inline]
 netlink_alloc_large_skb+0xad/0xe0 net/netlink/af_netlink.c:1196
 netlink_sendmsg+0x3b4/0x6e0 net/netlink/af_netlink.c:1867
 sock_sendmsg_nosec net/socket.c:713 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:728
 ____sys_sendmsg+0x312/0x410 net/socket.c:2568
 ___sys_sendmsg net/socket.c:2622 [inline]
 __sys_sendmsg+0x19d/0x230 net/socket.c:2654
 __do_sys_sendmsg net/socket.c:2659 [inline]
 __se_sys_sendmsg net/socket.c:2657 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2657
 x64_sys_call+0x2734/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8668a528 of 8 bytes by task 19452 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:482 [inline]
 desc_push_tail kernel/printk/printk_ringbuffer.c:778 [inline]
 desc_reserve kernel/printk/printk_ringbuffer.c:924 [inline]
 prb_reserve+0x235/0xb60 kernel/printk/printk_ringbuffer.c:1619
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 __netdev_printk+0x2d1/0x3e0 net/core/dev.c:12233
 netdev_info+0x99/0xc0 net/core/dev.c:12280
 team_port_del+0x647/0x6a0 drivers/net/team/team_core.c:1383
 team_uninit+0x6e/0x2a0 drivers/net/team/team_core.c:1686
 unregister_netdevice_many_notify+0xdd5/0x1360 net/core/dev.c:11831
 rtnl_delete_link net/core/rtnetlink.c:3485 [inline]
 rtnl_dellink+0x38b/0x590 net/core/rtnetlink.c:3527
 rtnetlink_rcv_msg+0x651/0x710 net/core/rtnetlink.c:6911
 netlink_rcv_skb+0x12c/0x230 net/netlink/af_netlink.c:2543
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6938
 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
 netlink_unicast+0x599/0x670 net/netlink/af_netlink.c:1348
 netlink_sendmsg+0x5cc/0x6e0 net/netlink/af_netlink.c:1892
 sock_sendmsg_nosec net/socket.c:713 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:728
 ____sys_sendmsg+0x312/0x410 net/socket.c:2568
 ___sys_sendmsg net/socket.c:2622 [inline]
 __sys_sendmsg+0x19d/0x230 net/socket.c:2654
 __do_sys_sendmsg net/socket.c:2659 [inline]
 __se_sys_sendmsg net/socket.c:2657 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2657
 x64_sys_call+0x2734/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000034250 -> 0x00000000000d1130

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 19452 Comm: syz.0.5835 Not tainted 6.13.0-syzkaller-04541-gdf60eac9efe8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
==================================================================
team0 (unregistering): Port device team_slave_1 removed