loop9: detected capacity change from 0 to 128
syz.9.3251[17529] is installing a program with bpf_probe_write_user helper that may corrupt user memory!
==================================================================
BUG: KCSAN: data-race in data_push_tail / vsnprintf

write to 0xffffffff88bcb307 of 1 bytes by task 29 on cpu 0:
 vsnprintf+0xdd8/0xe30
 vscnprintf+0x42/0x90 lib/vsprintf.c:2954
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2216
 vprintk_store+0x589/0x870 kernel/printk/printk.c:2336
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_deferred kernel/printk/printk.c:4571 [inline]
 _printk_deferred+0x83/0xb0 kernel/printk/printk.c:4580
 ___ratelimit+0x294/0x2b0 lib/ratelimit.c:56
 __printk_ratelimit+0x1c/0x30 kernel/printk/printk.c:4596
 kauditd_printk_skb kernel/audit.c:545 [inline]
 kauditd_hold_skb+0x61/0x1b0 kernel/audit.c:581
 kauditd_send_queue+0x288/0x2e0 kernel/audit.c:766
 kauditd_thread+0x42a/0x650 kernel/audit.c:890
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffffffff88bcb300 of 8 bytes by task 17529 on cpu 1:
 data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:679
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1054
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:86
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 bpf_get_probe_write_proto+0x8b/0x90 kernel/trace/bpf_trace.c:365
 bpf_tracing_func_proto+0x596/0x790 kernel/trace/bpf_trace.c:1490
 raw_tp_prog_func_proto+0x65/0xc0 kernel/trace/bpf_trace.c:1973
 get_helper_proto kernel/bpf/verifier.c:10641 [inline]
 mark_fastcall_pattern_for_call kernel/bpf/verifier.c:16511 [inline]
 mark_fastcall_patterns+0x566/0xd10 kernel/bpf/verifier.c:16622
 bpf_check+0x3ec1/0xd5e0 kernel/bpf/verifier.c:22661
 bpf_prog_load+0xed4/0x1070 kernel/bpf/syscall.c:2947
 __sys_bpf+0x463/0x7a0 kernel/bpf/syscall.c:5790
 __do_sys_bpf kernel/bpf/syscall.c:5897 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5895 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5895
 x64_sys_call+0x2914/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000fffff706 -> 0x000a646564657373

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 17529 Comm: syz.9.3251 Not tainted 6.13.0-rc4-syzkaller-00012-g9b2ffa6148b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================
syz.9.3251[17529] is installing a program with bpf_probe_write_user helper that may corrupt user memory!
syz.9.3251[17529] is installing a program with bpf_probe_write_user helper that may corrupt user memory!