From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f79.google.com (mail-oa1-f79.google.com [209.85.160.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3CA812F7AD0 for ; Wed, 21 Jan 2026 13:35:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769002527; cv=none; b=SiXASrUiSiE0PCobV7Ogr1Dsz4A+5oFeTJkGBr7OmX6YF7mcMAQdUrR6BNGqHseLthsvoEYUu5ZY4WACiFMkw/MSFxjRcer6nBNn+e87PPelBNnlOT7TC95FpxddiP/PWo0iWOwOwqWyGplU83nhQ22aaWcCf+71G143g9Q3jrc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769002527; c=relaxed/simple; bh=DAMSM75OcpULNAlZR0RaY0aEjdaRoLtxpze29C5gx5M=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=K4QeApSOlSoGO+cDJct9egCYEHDM+nTtlWWnf4amRSjnkEKOcN3l4DWZvk3ZUq0Bb4q8vOCTqlV3+pxryAWy5EdGKd8t8V6Vnwg26Ahr5lOUQzC5LU8NwTQmQC8LIG/4THALBOE/mh0VtU2H/koFiKyGIls3MLFmQWusXgug5kA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.160.79 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oa1-f79.google.com with SMTP id 586e51a60fabf-3ff590953b1so2546288fac.2 for ; Wed, 21 Jan 2026 05:35:26 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769002525; x=1769607325; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=53JzOWPeoVrxy4qopP5RdUY6pGflKuhaRCQZhYCcfoY=; b=fdqFX3j4kxlI6S/JJvFyNS/Lb3MhZFpm3ARiyl+mx78gdHSxv5udk27P8aFzJTGaz/ h1U0AWdaQKAwxbFZx7F5AMhmf1AlPF07WTXpj2CK02TZRgd/IFj2Ni6ySInEB2Lc1UZ4 32hrvsTusv51bxhzvtIfsHXS2mk+Sso4TNNU8k4Mjwc9gEya6aGxighl5Wvk1JhULtnE W7J8n/x0tO28CeXd0PifQSHEY4Rf+tvVTrS6qgTLXqkNfoOvDhS6EaSiryKRiiHUb4rt Xx2zjZSCiC9w5sd1i1CjPw7USFs3/Dsh5mKzrDV57DNrCZFclu4eJ1wCX31hoOm8HBaV O3sg== X-Forwarded-Encrypted: i=1; AJvYcCWKEr0J7Qx4xqDnVI9VPJgjR2HwYqx05PY3HjhWo8uwrzkPJfm5z1gM87MGUP6pizLrDlNtDQWO6kQABmg=@vger.kernel.org X-Gm-Message-State: AOJu0Yyy9wgoFaY/aZUKO8k3snJQbLxY9532rkZRJMb49ejGtad81RM0 osfsOdmefbGfr19K0r0M3BcwNaJDZ7j0q870Ijx1Ka0qvZkM8FwBDsythOq17S07S4kRrcZi5Xg 6e5ds2p9ZsGf/V9lXYfibFedbUAb+jBUxbz6Ozmps0/1AH/fDMhkjxL7Ph0A= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1391:b0:660:ffff:da11 with SMTP id 006d021491bc7-662affaebfdmr2032067eaf.26.1769002525269; Wed, 21 Jan 2026 05:35:25 -0800 (PST) Date: Wed, 21 Jan 2026 05:35:25 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6970d61d.050a0220.706b.0010.GAE@google.com> Subject: [syzbot] [net?] general protection fault in ife_tlv_meta_encode From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, jhs@mojatatu.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, yotam.gi@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c03e9c42ae8f Merge tag 'dma-mapping-6.19-2026-01-20' of gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12ce73fa580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ae589cd0a6acd9be dashboard link: https://syzkaller.appspot.com/bug?extid=5cf914f193dffde3bd3c compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-c03e9c42.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b6abca6c0155/vmlinux-c03e9c42.xz kernel image: https://storage.googleapis.com/syzbot-assets/1bcd936b6484/bzImage-c03e9c42.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5cf914f193dffde3bd3c@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 3 UID: 0 PID: 8990 Comm: syz.0.696 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:ife_tlv_meta_encode+0x41/0xa0 net/ife/ife.c:166 Code: 89 d5 53 89 f3 c1 e3 10 e8 8c ed 71 f6 0f b7 c5 4c 89 ea 44 8d 78 07 83 c0 04 48 c1 ea 03 09 c3 48 b8 00 00 00 00 00 fc ff df <0f> b6 14 02 4c 89 e8 0f cb 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 RSP: 0018:ffffc900038cf238 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000010008 RCX: ffffc900038cf290 RDX: 0000000000000000 RSI: ffffffff8b4c7434 RDI: 0000000000000000 RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000001000 R11: 000000000000001e R12: ffffc900038cf290 R13: 0000000000000000 R14: 0000000000000004 R15: 000000000000000b FS: 0000000000000000(0000) GS:ffff8880979f6000(0063) knlGS:00000000f544db40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f544cfac CR3: 000000006a9f4000 CR4: 0000000000352ef0 Call Trace: ife_encode_meta_u32+0x153/0x180 net/sched/act_ife.c:101 tcf_ife_encode net/sched/act_ife.c:841 [inline] tcf_ife_act+0x1022/0x1de0 net/sched/act_ife.c:877 tc_act include/net/tc_wrapper.h:130 [inline] tcf_action_exec+0x1c0/0xa20 net/sched/act_api.c:1152 tcf_exts_exec include/net/pkt_cls.h:349 [inline] mall_classify+0x1a0/0x2a0 net/sched/cls_matchall.c:42 tc_classify include/net/tc_wrapper.h:197 [inline] __tcf_classify net/sched/cls_api.c:1764 [inline] tcf_classify+0x7f2/0x1380 net/sched/cls_api.c:1860 multiq_classify net/sched/sch_multiq.c:39 [inline] multiq_enqueue+0xe0/0x510 net/sched/sch_multiq.c:66 dev_qdisc_enqueue+0x45/0x250 net/core/dev.c:4147 __dev_xmit_skb net/core/dev.c:4262 [inline] __dev_queue_xmit+0x2998/0x46c0 net/core/dev.c:4798 dev_queue_xmit include/linux/netdevice.h:3381 [inline] packet_xmit+0x23e/0x350 net/packet/af_packet.c:275 packet_snd net/packet/af_packet.c:3076 [inline] packet_sendmsg+0x26e3/0x54a0 net/packet/af_packet.c:3108 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa5d/0xc30 net/socket.c:2592 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2646 __sys_sendmsg+0x16d/0x220 net/socket.c:2678 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xe8/0x680 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf705d579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f544d55c EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00000000800000c0 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ife_tlv_meta_encode+0x41/0xa0 net/ife/ife.c:166 Code: 89 d5 53 89 f3 c1 e3 10 e8 8c ed 71 f6 0f b7 c5 4c 89 ea 44 8d 78 07 83 c0 04 48 c1 ea 03 09 c3 48 b8 00 00 00 00 00 fc ff df <0f> b6 14 02 4c 89 e8 0f cb 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 RSP: 0018:ffffc900038cf238 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000010008 RCX: ffffc900038cf290 RDX: 0000000000000000 RSI: ffffffff8b4c7434 RDI: 0000000000000000 RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000001000 R11: 000000000000001e R12: ffffc900038cf290 R13: 0000000000000000 R14: 0000000000000004 R15: 000000000000000b FS: 0000000000000000(0000) GS:ffff8880979f6000(0063) knlGS:00000000f544db40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f544cfac CR3: 000000006a9f4000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 89 d5 mov %edx,%ebp 2: 53 push %rbx 3: 89 f3 mov %esi,%ebx 5: c1 e3 10 shl $0x10,%ebx 8: e8 8c ed 71 f6 call 0xf671ed99 d: 0f b7 c5 movzwl %bp,%eax 10: 4c 89 ea mov %r13,%rdx 13: 44 8d 78 07 lea 0x7(%rax),%r15d 17: 83 c0 04 add $0x4,%eax 1a: 48 c1 ea 03 shr $0x3,%rdx 1e: 09 c3 or %eax,%ebx 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2e: 4c 89 e8 mov %r13,%rax 31: 0f cb bswap %ebx 33: 83 e0 07 and $0x7,%eax 36: 83 c0 03 add $0x3,%eax 39: 38 d0 cmp %dl,%al 3b: 7c 04 jl 0x41 3d: 84 d2 test %dl,%dl 3f: 75 .byte 0x75 --- 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@googlegroups.com. 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 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