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BUG: KASAN: global-out-of-bounds in record_print_text+0x33f/0x380 kernel/printk/printk.c:1401
Write of size 1 at addr ffffffff8f07e10e by task kauditd/35

CPU: 1 PID: 35 Comm: kauditd Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 record_print_text+0x33f/0x380 kernel/printk/printk.c:1401
 console_unlock+0x318/0xbb0 kernel/printk/printk.c:2555
 vprintk_emit+0x189/0x490 kernel/printk/printk.c:2092
 vprintk_func+0x8d/0x1e0 kernel/printk/printk_safe.c:393
 printk+0xba/0xed kernel/printk/printk.c:2140
 kauditd_printk_skb kernel/audit.c:538 [inline]
 kauditd_hold_skb.cold+0x41/0x50 kernel/audit.c:571
 kauditd_send_queue+0x19d/0x210 kernel/audit.c:734
 kauditd_thread+0x7f0/0xb80 kernel/audit.c:860
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

The buggy address belongs to the variable:
 printk_rb_dynamic+0x6e/0x80

Memory state around the buggy address:
 ffffffff8f07e000: f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9
 ffffffff8f07e080: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 f9 f9
>ffffffff8f07e100: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
                      ^
 ffffffff8f07e180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8f07e200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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