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BUG: KCSAN: data-race in data_push_tail / number

write to 0xffffffff88f0aee2 of 1 bytes by task 7396 on cpu 1:
 number+0x836/0xb50 lib/vsprintf.c:529
 vsnprintf+0xb6d/0xed0 lib/vsprintf.c:2717
 va_format lib/vsprintf.c:1663 [inline]
 pointer+0xeb/0x800 lib/vsprintf.c:2283
 vsnprintf+0x8a1/0xed0 lib/vsprintf.c:2655
 vscnprintf+0x29/0x80 lib/vsprintf.c:2754
 printk_sprint kernel/printk/printk.c:1936 [inline]
 vprintk_store+0x4c1/0x9c0 kernel/printk/printk.c:2039
 vprintk_emit+0xca/0x3e0 kernel/printk/printk.c:2081
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2115
 vprintk_func+0x11b/0x120 kernel/printk/printk_safe.c:401
 printk+0x62/0x82 kernel/printk/printk.c:2146
 _udf_err+0x88/0xb0 fs/udf/super.c:2334
 udf_read_tagged+0x2a2/0x380 fs/udf/misc.c:212
 udf_check_anchor_block+0xed/0x280 fs/udf/super.c:1833
 udf_scan_anchors+0x327/0x390 fs/udf/super.c:1912
 udf_find_anchor fs/udf/super.c:1930 [inline]
 udf_load_vrs+0x105/0x610 fs/udf/super.c:1995
 udf_fill_super+0x4b6/0xd00 fs/udf/super.c:2188
 mount_bdev+0x1e8/0x290 fs/super.c:1367
 udf_mount+0x2d/0x40 fs/udf/super.c:127
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1497
 do_new_mount fs/namespace.c:2903 [inline]
 path_mount+0x11b9/0x1c00 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3431
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3431
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff88f0aee0 of 8 bytes by task 7438 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:587 [inline]
 data_push_tail+0x125/0x460 kernel/printk/printk_ringbuffer.c:672
 data_alloc+0xbc/0x2b0 kernel/printk/printk_ringbuffer.c:1043
 prb_reserve+0x8f0/0xbc0 kernel/printk/printk_ringbuffer.c:1549
 vprintk_store+0x3e9/0x9c0 kernel/printk/printk.c:2029
 vprintk_emit+0xca/0x3e0 kernel/printk/printk.c:2081
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2115
 vprintk_func+0x11b/0x120 kernel/printk/printk_safe.c:401
 printk+0x62/0x82 kernel/printk/printk.c:2146
 _udf_err+0x88/0xb0 fs/udf/super.c:2334
 udf_process_sequence+0x622/0x2070 fs/udf/super.c:1744
 udf_load_sequence fs/udf/super.c:1800 [inline]
 udf_check_anchor_block+0x1a3/0x280 fs/udf/super.c:1840
 udf_scan_anchors+0xbf/0x390 fs/udf/super.c:1873
 udf_find_anchor fs/udf/super.c:1930 [inline]
 udf_load_vrs+0x105/0x610 fs/udf/super.c:1995
 udf_fill_super+0x4b6/0xd00 fs/udf/super.c:2188
 mount_bdev+0x1e8/0x290 fs/super.c:1367
 udf_mount+0x2d/0x40 fs/udf/super.c:127
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1497
 do_new_mount fs/namespace.c:2903 [inline]
 path_mount+0x11b9/0x1c00 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3431
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3431
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7438 Comm: syz-executor.3 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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