Hello, syzbot found the following issue on: HEAD commit: 76df934c6d5f MAINTAINERS: Add netdev subsystem profile link git tree: net console+strace: https://syzkaller.appspot.com/x/log.txt?x=10c2b667680000 kernel config: https://syzkaller.appspot.com/x/.config?x=84217b7fc4acdc59 dashboard link: https://syzkaller.appspot.com/bug?extid=e2c932aec5c8a6e1d31c compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12b2f668e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=171ea200e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e271179068c6/disk-76df934c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b9523b3749bb/vmlinux-76df934c.xz kernel image: https://storage.googleapis.com/syzbot-assets/6c1a888bade0/bzImage-76df934c.xz The issue was bisected to: commit 114039b342014680911c35bd6b72624180fd669a Author: Stanislav Fomichev <sdf@xxxxxxxxxx> Date: Mon Nov 21 18:03:39 2022 +0000 bpf: Move skb->len == 0 checks into __bpf_redirect bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13d237b7680000 final oops: https://syzkaller.appspot.com/x/report.txt?x=103237b7680000 console output: https://syzkaller.appspot.com/x/log.txt?x=17d237b7680000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e2c932aec5c8a6e1d31c@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 114039b34201 ("bpf: Move skb->len == 0 checks into __bpf_redirect") ------------[ cut here ]------------ Please remove unsupported % in format string WARNING: CPU: 0 PID: 5068 at lib/vsprintf.c:2675 format_decode+0xa03/0xba0 lib/vsprintf.c:2675 Modules linked in: CPU: 0 PID: 5068 Comm: syz-executor288 Not tainted 6.7.0-rc1-syzkaller-00134-g76df934c6d5f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:format_decode+0xa03/0xba0 lib/vsprintf.c:2675 Code: f7 41 c6 44 24 05 08 e9 c4 fa ff ff e8 c6 f7 15 f7 c6 05 0b bd 91 04 01 90 48 c7 c7 60 5f 19 8c 40 0f b6 f5 e8 2e 17 dc f6 90 <0f> 0b 90 90 e9 17 fc ff ff 48 8b 3c 24 e8 4b 87 6c f7 e9 13 f7 ff RSP: 0018:ffffc90003b6f798 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffffc90003b6fa0c RCX: ffffffff814db209 RDX: ffff8880214b9dc0 RSI: ffffffff814db216 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90003b6f898 R13: 0000000000000000 R14: 0000000000000000 R15: 00000000ffffffd0 FS: 000055555567c380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000f6f398 CR3: 00000000251e7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bstr_printf+0x13b/0x1050 lib/vsprintf.c:3248 ____bpf_trace_printk kernel/trace/bpf_trace.c:386 [inline] bpf_trace_printk+0x10b/0x180 kernel/trace/bpf_trace.c:371 bpf_prog_12183cdb1cd51dab+0x36/0x3a bpf_dispatcher_nop_func include/linux/bpf.h:1196 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_test_run+0x3e1/0x9e0 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0xb75/0x1dd0 net/bpf/test_run.c:1045 bpf_prog_test_run kernel/bpf/syscall.c:4040 [inline] __sys_bpf+0x11bf/0x4920 kernel/bpf/syscall.c:5401 __do_sys_bpf kernel/bpf/syscall.c:5487 [inline] __se_sys_bpf kernel/bpf/syscall.c:5485 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5485 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fefcec014e9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffca6179888 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ffca6179a58 RCX: 00007fefcec014e9 RDX: 0000000000000028 RSI: 0000000020000080 RDI: 000000000000000a RBP: 00007fefcec74610 R08: 0000000000000000 R09: 00007ffca6179a58 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffca6179a48 R14: 0000000000000001 R15: 0000000000000001 </TASK> --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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
