=====================================================
BUG: KMSAN: uninit-value in strnchr+0x90/0xd0 lib/string.c:387
 strnchr+0x90/0xd0 lib/string.c:387
 bpf_bprintf_prepare+0x1c2/0x23c0 kernel/bpf/helpers.c:829
 ____bpf_trace_printk kernel/trace/bpf_trace.c:385 [inline]
 bpf_trace_printk+0xec/0x3e0 kernel/trace/bpf_trace.c:375
 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997
 __bpf_prog_run128+0xb5/0xe0 kernel/bpf/core.c:2236
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run1+0xf4/0x2d0 kernel/trace/bpf_trace.c:2419
 __bpf_trace_rcu_utilization+0x21/0x30 include/trace/events/rcu.h:27
 trace_rcu_utilization include/trace/events/rcu.h:27 [inline]
 rcu_note_context_switch+0x1d09/0x1e90 kernel/rcu/tree_plugin.h:318
 __schedule+0x15c/0x6bc0 kernel/sched/core.c:6635
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x13d/0x380 kernel/sched/core.c:6838
 do_nanosleep+0x104/0x750 kernel/time/hrtimer.c:2028
 hrtimer_nanosleep+0x22c/0x470 kernel/time/hrtimer.c:2081
 common_nsleep+0x10a/0x130 kernel/time/posix-timers.c:1350
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1396 [inline]
 __se_sys_clock_nanosleep kernel/time/posix-timers.c:1373 [inline]
 __x64_sys_clock_nanosleep+0x616/0x6d0 kernel/time/posix-timers.c:1373
 x64_sys_call+0x2b10/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:231
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable stack created at:
 __bpf_prog_run128+0x45/0xe0 kernel/bpf/core.c:2236
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run1+0xf4/0x2d0 kernel/trace/bpf_trace.c:2419

CPU: 1 PID: 7207 Comm: syz-executor.4 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
=====================================================