=====================================================
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_run32+0xb2/0xe0 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_run5+0x16f/0x350 kernel/trace/bpf_trace.c:2423
 __bpf_trace_signal_generate+0x45/0x60 include/trace/events/signal.h:50
 trace_signal_generate include/trace/events/signal.h:50 [inline]
 __send_signal_locked+0x1157/0x1200 kernel/signal.c:1187
 send_signal_locked+0x761/0xa50 kernel/signal.c:1248
 do_send_sig_info+0x19b/0x240 kernel/signal.c:1301
 send_sigio_to_task+0x72a/0x810 fs/fcntl.c:800
 send_sigio+0x17f/0x460 fs/fcntl.c:827
 dnotify_handle_event+0x1ce/0x6d0 fs/notify/dnotify/dnotify.c:114
 fsnotify_handle_inode_event+0x374/0x470 fs/notify/fsnotify.c:270
 fsnotify_handle_event fs/notify/fsnotify.c:299 [inline]
 send_to_group fs/notify/fsnotify.c:370 [inline]
 fsnotify+0x2f5b/0x3530 fs/notify/fsnotify.c:576
 __fsnotify_parent+0x74d/0x940 fs/notify/fsnotify.c:236
 fsnotify_parent include/linux/fsnotify.h:83 [inline]
 fsnotify_dentry include/linux/fsnotify.h:95 [inline]
 fsnotify_change+0x332/0x430 include/linux/fsnotify.h:425
 notify_change+0x1ac3/0x1af0 fs/attr.c:502
 vfs_utimes+0x717/0xa80 fs/utimes.c:66
 do_utimes_path fs/utimes.c:99 [inline]
 do_utimes fs/utimes.c:145 [inline]
 __do_sys_utime32 fs/utimes.c:248 [inline]
 __se_sys_utime32+0x323/0x470 fs/utimes.c:236
 __ia32_sys_utime32+0x6b/0xa0 fs/utimes.c:236
 ia32_sys_call+0x17bd/0x40a0 arch/x86/include/generated/asm/syscalls_32.h:31
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb4/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Local variable stack created at:
 __bpf_prog_run32+0x43/0xe0 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_run5+0x16f/0x350 kernel/trace/bpf_trace.c:2423

CPU: 1 PID: 5775 Comm: syz-executor.4 Not tainted 6.9.0-syzkaller-02339-g101b7a97143a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
=====================================================