------------[ cut here ]------------
=====================================================
BUG: KMSAN: uninit-value in vsnprintf+0x15d2/0x1b20 lib/vsprintf.c:2890
 vsnprintf+0x15d2/0x1b20 lib/vsprintf.c:2890
 vprintk_store+0x3ae/0x1530 kernel/printk/printk.c:2252
 vprintk_emit+0x21a/0xb60 kernel/printk/printk.c:2399
 vprintk_default+0x3f/0x50 kernel/printk/printk.c:2438
 vprintk+0x36/0x50 kernel/printk/printk_safe.c:82
 __warn_printf lib/bug.c:187 [inline]
 __report_bug+0xa53/0xe80 lib/bug.c:240
 report_bug_entry+0x148/0x1d0 lib/bug.c:265
 handle_bug+0xe1/0x230 arch/x86/kernel/traps.c:430
 exc_invalid_op+0x1f/0x50 arch/x86/kernel/traps.c:489
 asm_exc_invalid_op+0x1f/0x30 arch/x86/include/asm/idtentry.h:616
 reg_bounds_sanity_check+0x577/0x1450 kernel/bpf/verifier.c:2715
 reg_set_min_max+0x3a8/0x440 kernel/bpf/verifier.c:16411
 check_cond_jmp_op+0x3b49/0x5410 kernel/bpf/verifier.c:16854
 do_check_insn kernel/bpf/verifier.c:19931 [inline]
 do_check+0x22f7/0x168c0 kernel/bpf/verifier.c:20071
 do_check_common+0x205b/0x3180 kernel/bpf/verifier.c:23261
 do_check_main kernel/bpf/verifier.c:23344 [inline]
 bpf_check+0x5d49/0x29d50 kernel/bpf/verifier.c:24649
 bpf_prog_load+0x2af2/0x3040 kernel/bpf/syscall.c:3077
 __sys_bpf+0x7df/0xeb0 kernel/bpf/syscall.c:6149
 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6257 [inline]
 __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:6257
 x64_sys_call+0x31c3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 vsnprintf+0x15cb/0x1b20 lib/vsprintf.c:-1
 vprintk_store+0x3ae/0x1530 kernel/printk/printk.c:2252
 vprintk_emit+0x21a/0xb60 kernel/printk/printk.c:2399
 vprintk_default+0x3f/0x50 kernel/printk/printk.c:2438
 vprintk+0x36/0x50 kernel/printk/printk_safe.c:82
 __warn_printf lib/bug.c:187 [inline]
 __report_bug+0xa53/0xe80 lib/bug.c:240
 report_bug_entry+0x148/0x1d0 lib/bug.c:265
 handle_bug+0xe1/0x230 arch/x86/kernel/traps.c:430
 exc_invalid_op+0x1f/0x50 arch/x86/kernel/traps.c:489
 asm_exc_invalid_op+0x1f/0x30 arch/x86/include/asm/idtentry.h:616

Local variable run_ctx.i created at:
 __bpf_trace_run kernel/trace/bpf_trace.c:2063 [inline]
 bpf_trace_run4+0xdc/0x540 kernel/trace/bpf_trace.c:2118
 __bpf_trace_sched_switch+0x221/0x290 include/trace/events/sched.h:220

CPU: 1 UID: 0 PID: 6474 Comm: syz.0.151 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
=====================================================