Hello, syzbot found the following issue on: HEAD commit: 81335f90e8a8 bpf: unconditionally reset backtrack_state ma.. git tree: bpf console+strace: https://syzkaller.appspot.com/x/log.txt?x=111d5132680000 kernel config: https://syzkaller.appspot.com/x/.config?x=f4894cf58531f dashboard link: https://syzkaller.appspot.com/bug?extid=b97d20ed568ce0951a06 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=1570bfc1680000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=126c6856680000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/15d122573dad/disk-81335f90.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/74edf542067b/vmlinux-81335f90.xz kernel image: https://storage.googleapis.com/syzbot-assets/22fa248ded38/bzImage-81335f90.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b97d20ed568ce0951a06@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5108 at include/linux/bpf_mprog.h:198 bpf_mprog_total include/linux/bpf_mprog.h:198 [inline] WARNING: CPU: 0 PID: 5108 at include/linux/bpf_mprog.h:198 bpf_mprog_pos_before+0x18c/0x280 kernel/bpf/mprog.c:200 Modules linked in: CPU: 0 PID: 5108 Comm: syz-executor123 Not tainted 6.6.0-rc1-syzkaller-00198-g81335f90e8a8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 RIP: 0010:bpf_mprog_total include/linux/bpf_mprog.h:198 [inline] RIP: 0010:bpf_mprog_pos_before+0x18c/0x280 kernel/bpf/mprog.c:200 Code: 89 e8 48 c1 e8 03 42 80 3c 38 00 0f 85 d8 00 00 00 4d 3b 65 00 0f 85 26 ff ff ff e8 3e 50 e3 ff 83 eb 01 eb 38 e8 34 50 e3 ff <0f> 0b e9 3a ff ff ff e8 28 50 e3 ff 4c 89 f2 48 b8 00 00 00 00 00 RSP: 0018:ffffc90003aafad0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801e873b80 RSI: ffffffff81a47e4c RDI: 0000000000000005 RBP: 0000000000000040 R08: 0000000000000005 R09: 000000000000003f R10: 0000000000000040 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88801fdb0418 R14: ffffc90003aafb98 R15: dffffc0000000000 FS: 0000555556eea380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8e2323b0d0 CR3: 00000000750ca000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bpf_mprog_attach+0x720/0xfe0 kernel/bpf/mprog.c:258 tcx_prog_attach+0x2bd/0xbd0 kernel/bpf/tcx.c:39 bpf_prog_attach kernel/bpf/syscall.c:3848 [inline] __sys_bpf+0x413e/0x4e90 kernel/bpf/syscall.c:5344 __do_sys_bpf kernel/bpf/syscall.c:5439 [inline] __se_sys_bpf kernel/bpf/syscall.c:5437 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5437 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f8e231c3cb9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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:00007ffc80795988 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8e231c3cb9 RDX: 0000000000000020 RSI: 0000000020000080 RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000006 R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 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. If the bug is already fixed, 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 bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
