Hello, syzbot found the following issue on: HEAD commit: 04b8076df253 Merge tag 'firewire-fixes-6.8-rc7' of git://g.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=10bb9306180000 kernel config: https://syzkaller.appspot.com/x/.config?x=80c7a82a572c0de3 dashboard link: https://syzkaller.appspot.com/bug?extid=9b8be5e35747291236c8 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11093316180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a53082180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a4610b1ff2a7/disk-04b8076d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/991e9d902d39/vmlinux-04b8076d.xz kernel image: https://storage.googleapis.com/syzbot-assets/a5b8e8e98121/bzImage-04b8076d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9b8be5e35747291236c8@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in strnchr+0x90/0xd0 lib/string.c:388 strnchr+0x90/0xd0 lib/string.c:388 bpf_bprintf_prepare+0x1c2/0x23b0 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+0x2180/0xdb80 kernel/bpf/core.c:1986 __bpf_prog_run32+0xb2/0xe0 kernel/bpf/core.c:2225 bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_test_run+0x482/0xaf0 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x14e5/0x1f20 net/bpf/test_run.c:1056 bpf_prog_test_run+0x6af/0xac0 kernel/bpf/syscall.c:4107 __sys_bpf+0x649/0xd60 kernel/bpf/syscall.c:5475 __do_sys_bpf kernel/bpf/syscall.c:5561 [inline] __se_sys_bpf kernel/bpf/syscall.c:5559 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5559 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+0x63/0x6b Local variable stack created at: __bpf_prog_run32+0x43/0xe0 kernel/bpf/core.c:2225 bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_test_run+0x482/0xaf0 net/bpf/test_run.c:423 CPU: 0 PID: 5019 Comm: syz-executor938 Not tainted 6.8.0-rc6-syzkaller-00250-g04b8076df253 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
