netlink: 36 bytes leftover after parsing attributes in process `syz-executor.1'.
==================================================================
BUG: KCSAN: data-race in data_push_tail / number

write to 0xffffffff86f46150 of 1 bytes by task 13356 on cpu 1:
 number+0x8b5/0xa90 lib/vsprintf.c:562
 vsnprintf+0xa44/0xe20 lib/vsprintf.c:2883
 va_format lib/vsprintf.c:1681 [inline]
 pointer+0x8a1/0xd10 lib/vsprintf.c:2448
 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
 __ext4_grp_locked_error+0x5a5/0x780 fs/ext4/super.c:1010
 ext4_mb_generate_buddy+0x3d2/0x460 fs/ext4/mballoc.c:1209
 ext4_mb_init_cache+0xa02/0xd80 fs/ext4/mballoc.c:1379
 ext4_mb_init_group+0x1c5/0x5c0 fs/ext4/mballoc.c:1515
 ext4_mb_good_group_nolock fs/ext4/mballoc.c:2663 [inline]
 ext4_mb_regular_allocator+0xadd/0x20f0 fs/ext4/mballoc.c:2864
 ext4_mb_new_blocks+0x801/0x21e0 fs/ext4/mballoc.c:6134
 ext4_ext_map_blocks+0xe42/0x3630 fs/ext4/extents.c:4285
 ext4_map_blocks+0x704/0xf60 fs/ext4/inode.c:621
 mpage_map_one_extent fs/ext4/inode.c:2159 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2212 [inline]
 ext4_do_writepages+0xdc5/0x21e0 fs/ext4/inode.c:2677
 ext4_writepages+0x15e/0x2e0 fs/ext4/inode.c:2766
 do_writepages+0x1c5/0x340 mm/page-writeback.c:2553
 filemap_fdatawrite_wbc+0xdb/0xf0 mm/filemap.c:393
 __filemap_fdatawrite_range mm/filemap.c:426 [inline]
 filemap_write_and_wait_range+0xe6/0x220 mm/filemap.c:681
 filemap_write_and_wait include/linux/pagemap.h:64 [inline]
 ext4_bmap+0x14e/0x180 fs/ext4/inode.c:3070
 bmap+0x60/0x90 fs/inode.c:1842
 ioctl_fibmap fs/ioctl.c:77 [inline]
 file_ioctl fs/ioctl.c:327 [inline]
 do_vfs_ioctl+0x11a6/0x1390 fs/ioctl.c:849
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl+0x81/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:856
 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 0xffffffff86f46150 of 8 bytes by task 13362 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
 __nla_validate_parse+0x15ba/0x1b50 lib/nlattr.c:615
 __nla_parse+0x40/0x50 lib/nlattr.c:700
 neigh_dump_info+0x1e7/0xe20 net/core/neighbour.c:2863
 netlink_dump+0x381/0x710 net/netlink/af_netlink.c:2269
 __netlink_dump_start+0x426/0x510 net/netlink/af_netlink.c:2376
 netlink_dump_start include/linux/netlink.h:330 [inline]
 rtnetlink_rcv_msg+0x70f/0x8c0 net/core/rtnetlink.c:6380
 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: 0x000000010000de8f -> 0x6572662039363934

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13362 Comm: syz-executor.1 Tainted: G        W          6.5.0-rc1-syzkaller-00276-g20edcec23f92 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
==================================================================
syz-executor.1 (13362) used greatest stack depth: 8896 bytes left