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BUG: KCSAN: data-race in data_alloc / data_push_tail

write to 0xffffffff870f7800 of 8 bytes by task 15092 on cpu 1:
 data_alloc+0x216/0x2c0 kernel/printk/printk_ringbuffer.c:1074
 prb_reserve+0x893/0xbc0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x53e/0x800 kernel/printk/printk.c:2228
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x71/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
 show_trace_log_lvl+0x42e/0x510 arch/x86/kernel/dumpstack.c:285
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xda/0x130 lib/dump_stack.c:106
 dump_stack+0x15/0x20 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail_ex+0x21f/0x230 lib/fault-inject.c:153
 __should_failslab+0x92/0xa0 mm/failslab.c:44
 should_failslab+0x9/0x20 mm/slub.c:3747
 slab_pre_alloc_hook mm/slub.c:3763 [inline]
 slab_alloc_node mm/slub.c:3842 [inline]
 kmem_cache_alloc+0x56/0x2d0 mm/slub.c:3867
 mt_alloc_one lib/maple_tree.c:162 [inline]
 mas_alloc_nodes+0x1d3/0x4a0 lib/maple_tree.c:1242
 mas_node_count_gfp lib/maple_tree.c:1322 [inline]
 mas_preallocate+0x773/0xc30 lib/maple_tree.c:5508
 vma_iter_prealloc mm/internal.h:1147 [inline]
 mmap_region+0xeb6/0x1650 mm/mmap.c:2885
 do_mmap+0x67e/0xa90 mm/mmap.c:1379
 vm_mmap_pgoff+0x12e/0x240 mm/util.c:556
 ksys_mmap_pgoff+0xc5/0x330 mm/mmap.c:1425
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffffffff870f7800 of 8 bytes by task 15094 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:675
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1046
 prb_reserve+0x893/0xbc0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x53e/0x800 kernel/printk/printk.c:2228
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x71/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 caif_disconnect_client+0x133/0x140 net/caif/cfcnfg.c:194
 chnl_net_open+0x4ff/0x5a0 net/caif/chnl_net.c:327
 __dev_open+0x281/0x3a0 net/core/dev.c:1446
 __dev_change_flags+0x153/0x400 net/core/dev.c:8648
 dev_change_flags+0x59/0xd0 net/core/dev.c:8720
 do_setlink+0x839/0x2440 net/core/rtnetlink.c:2903
 rtnl_group_changelink net/core/rtnetlink.c:3452 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3711 [inline]
 rtnl_newlink+0xbbf/0x1670 net/core/rtnetlink.c:3748
 rtnetlink_rcv_msg+0x80a/0x8c0 net/core/rtnetlink.c:6615
 netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2543
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6633
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x589/0x650 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x37c/0x4d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x1e9/0x270 net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2674
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x000000010001a242 -> 0x000000010001adc2

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15094 Comm: syz-executor.2 Tainted: G        W          6.8.0-rc1-syzkaller-00169-gecb1b8288dc7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check.