loop2: detected capacity change from 0 to 11
__nla_validate_parse: 3 callbacks suppressed
netlink: 32 bytes leftover after parsing attributes in process `syz-executor.2'.
==================================================================
BUG: KCSAN: data-race in data_push_tail / number

write to 0xffffffff86fe2ca0 of 1 bytes by task 8478 on cpu 0:
 number+0x8ca/0xb60 lib/vsprintf.c:561
 vsnprintf+0xb6d/0xed0 lib/vsprintf.c:2872
 vscnprintf+0x3e/0x80 lib/vsprintf.c:2912
 printk_sprint kernel/printk/printk.c:2099 [inline]
 vprintk_store+0x638/0xbb0 kernel/printk/printk.c:2209
 vprintk_emit+0xcc/0x430 kernel/printk/printk.c:2256
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2283
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0x97 kernel/printk/printk.c:2293
 blk_print_req_error block/blk-mq.c:702 [inline]
 blk_update_request+0x84e/0x980 block/blk-mq.c:798
 blk_mq_end_request block/blk-mq.c:940 [inline]
 blk_mq_plug_issue_direct+0x1af/0x5e0 block/blk-mq.c:2557
 blk_mq_flush_plug_list+0x27a/0x340 block/blk-mq.c:2638
 __blk_flush_plug+0x25a/0x2b0 block/blk-core.c:1244
 blk_finish_plug+0x44/0x60 block/blk-core.c:1268
 read_pages+0x523/0x930 mm/readahead.c:263
 page_cache_ra_unbounded+0x3a6/0x400 mm/readahead.c:352
 do_page_cache_ra mm/readahead.c:382 [inline]
 force_page_cache_ra+0x1e6/0x220 mm/readahead.c:414
 page_cache_sync_ra+0xcc/0xe0 mm/readahead.c:780
 page_cache_sync_readahead include/linux/pagemap.h:1187 [inline]
 filemap_get_pages mm/filemap.c:2598 [inline]
 filemap_read+0x3d5/0xe10 mm/filemap.c:2685
 blkdev_read_iter+0x2cc/0x380 block/fops.c:611
 call_read_iter include/linux/fs.h:2073 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 vfs_read+0x5e2/0x6c0 fs/read_write.c:482
 ksys_read+0xd9/0x190 fs/read_write.c:620
 __do_sys_read fs/read_write.c:630 [inline]
 __se_sys_read fs/read_write.c:628 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:628
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff86fe2ca0 of 8 bytes by task 8622 on cpu 1:
 data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
 data_push_tail+0x138/0x470 kernel/printk/printk_ringbuffer.c:675
 data_alloc+0xbc/0x2b0 kernel/printk/printk_ringbuffer.c:1046
 prb_reserve+0x931/0xc10 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x560/0xbb0 kernel/printk/printk.c:2199
 vprintk_emit+0xcc/0x430 kernel/printk/printk.c:2256
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2283
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0x97 kernel/printk/printk.c:2293
 __nla_validate_parse+0x1424/0x1760 lib/nlattr.c:600
 __nla_parse+0x3c/0x50 lib/nlattr.c:685
 nla_parse_deprecated include/net/netlink.h:680 [inline]
 nfnetlink_rcv_msg+0x3b2/0x590 net/netfilter/nfnetlink.c:270
 netlink_rcv_skb+0x14e/0x250 net/netlink/af_netlink.c:2496
 nfnetlink_rcv+0x17c/0x13d0 net/netfilter/nfnetlink.c:654
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x60b/0x6d0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x72b/0x850 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 ____sys_sendmsg+0x39a/0x510 net/socket.c:2413
 ___sys_sendmsg net/socket.c:2467 [inline]
 __sys_sendmsg+0x195/0x230 net/socket.c:2496
 __do_sys_sendmsg net/socket.c:2505 [inline]
 __se_sys_sendmsg net/socket.c:2503 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2503
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000ffffea4f -> 0x5f73796870203030

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8622 Comm: syz-executor.2 Not tainted 5.17.0-syzkaller-12882-g1930a6e739c4-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
syz-executor.2 (8622) used greatest stack depth: 9488 bytes left