==================================================================
BUG: KCSAN: data-race in data_push_tail / symbol_string

write to 0xffffffff86f4c919 of 1 bytes by task 8950 on cpu 1:
 string_nocheck lib/vsprintf.c:648 [inline]
 symbol_string+0x1b6/0x240 lib/vsprintf.c:1004
 pointer+0x77a/0xd10 lib/vsprintf.c:2415
 vsnprintf+0x861/0xe20 lib/vsprintf.c:2821
 vscnprintf+0x42/0x80 lib/vsprintf.c:2923
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2128
 vprintk_store+0x56f/0x800 kernel/printk/printk.c:2242
 vprintk_emit+0xd0/0x430 kernel/printk/printk.c:2288
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x83/0x90 kernel/printk/printk_safe.c:50
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
 show_trace_log_lvl+0x37e/0x400 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/slab_common.c:1471
 slab_pre_alloc_hook+0x38/0x180 mm/slab.h:711
 kmem_cache_alloc_bulk+0x4f/0x280 mm/slub.c:4037
 mt_alloc_bulk lib/maple_tree.c:164 [inline]
 mas_alloc_nodes+0x2bb/0x490 lib/maple_tree.c:1304
 mas_node_count_gfp lib/maple_tree.c:1362 [inline]
 mas_preallocate+0xb8/0x1e0 lib/maple_tree.c:5547
 vma_iter_prealloc mm/internal.h:1032 [inline]
 __split_vma+0x11c/0x420 mm/mmap.c:2349
 do_vmi_align_munmap+0x270/0x770 mm/mmap.c:2482
 do_vmi_munmap+0x1ea/0x230 mm/mmap.c:2624
 mmap_region+0x53c/0x14d0 mm/mmap.c:2674
 do_mmap+0x69c/0xaa0 mm/mmap.c:1363
 vm_mmap_pgoff+0x12f/0x240 mm/util.c:543
 ksys_mmap_pgoff+0x2b8/0x330 mm/mmap.c:1409
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff86f4c918 of 8 bytes by task 8935 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:2232
 vprintk_emit+0xd0/0x430 kernel/printk/printk.c:2288
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x83/0x90 kernel/printk/printk_safe.c:50
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 caif_disconnect_client+0x133/0x140 net/caif/cfcnfg.c:194
 chnl_net_open+0x50b/0x5b0 net/caif/chnl_net.c:326
 __dev_open+0x281/0x3a0 net/core/dev.c:1442
 __dev_change_flags+0x159/0x400 net/core/dev.c:8530
 dev_change_flags+0x59/0xd0 net/core/dev.c:8602
 do_setlink+0x9f6/0x2430 net/core/rtnetlink.c:2867
 rtnl_group_changelink net/core/rtnetlink.c:3409 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3665 [inline]
 rtnl_newlink+0xb98/0x1600 net/core/rtnetlink.c:3702
 rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6424
 netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2549
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6442
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0x56f/0x640 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0x665/0x770 net/netlink/af_netlink.c:1914
 sock_sendmsg_nosec net/socket.c:725 [inline]
 sock_sendmsg net/socket.c:748 [inline]
 ____sys_sendmsg+0x37c/0x4d0 net/socket.c:2494
 ___sys_sendmsg net/socket.c:2548 [inline]
 __sys_sendmsg+0x1e9/0x270 net/socket.c:2577
 __do_sys_sendmsg net/socket.c:2586 [inline]
 __se_sys_sendmsg net/socket.c:2584 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2584
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x000000010000b996 -> 0x5f646c756f687320

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8935 Comm: syz-executor.4 Not tainted 6.5.0-rc3-syzkaller-00283-g12214540ad87 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
==================================================================
A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check.
syz-executor.4 (8935) used greatest stack depth: 8712 bytes left