===================================================== 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_run96+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_xdp include/net/xdp.h:514 [inline] xdp_test_run_batch net/bpf/test_run.c:313 [inline] bpf_test_run_xdp_live+0x10a9/0x2f70 net/bpf/test_run.c:384 bpf_prog_test_run_xdp+0xf02/0x1a40 net/bpf/test_run.c:1267 bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4269 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5678 __do_sys_bpf kernel/bpf/syscall.c:5767 [inline] __se_sys_bpf kernel/bpf/syscall.c:5765 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5765 x64_sys_call+0x96b/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:322 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_run96+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_xdp include/net/xdp.h:514 [inline] xdp_test_run_batch net/bpf/test_run.c:313 [inline] bpf_test_run_xdp_live+0x10a9/0x2f70 net/bpf/test_run.c:384 CPU: 0 PID: 1356 Comm: syz-executor.0 Tainted: G W 6.9.0-syzkaller-02707-g614da38e2f7a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 =====================================================