From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f69.google.com (mail-ot1-f69.google.com [209.85.210.69]) (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 DEF3B339A8 for ; Fri, 13 Feb 2026 20:07:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771013253; cv=none; b=AewU97jjey5M+KMbB6fFRbugO/jeD+42mplgd9ha/61CDZmkRrI4VKQtXyBaZrNc4TyOJ8ycfKNPSct8/XhWyMpd9vEbviMFdXfxe0eLaits4FYir/z0i1pV/yx+mphdMv9/oHGTDp2H4jQLbEL/H612jsIlSKIf5l2EsmBq9TA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771013253; c=relaxed/simple; bh=iPbUyrZ/cHAbPklt30x6GWKULBcZbziWIRRQ/1zzWOI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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:from:to:cc:subject:date:message-id:reply-to; bh=Pz6Gedea6EkVqgMD44XOwHif99Mq0fIjgcN34vbFrM0=; b=I8pOebIAT3+I047qnixg/pbqMgEjQ46MKio7fPLdqPYTtEHTK1Vrsu1NvJxik2+7qr lCnd2K+NCfFUwoZoXOY5tMvX/gs7tXDaaSv7iyjm46CpnLvIG/t99cwIWON/MaYz0adh 5nazlHjxR1j1nh/cmrEECvwg1I+dOMHl5IWfx1Vl93ZkON02F2Z6p+M/emmZyDpkIRnK niOJztj5G12bEP6QW1OUi8VRCe6BKZ8LiihJRes7yWHxd9gk/mFgcxm5wFgSe34I04h1 +j0I5GZqJXlgzqF7mhRyPieTiGJyRGQ46GFGAJ2Vun4nQmQvh+7+Yd+QUCPyfyEKVehU snuQ== X-Forwarded-Encrypted: i=1; AJvYcCXFMACCndsi7tLYImgmD79IkcvVzuk5qp9WKLyPs1mwstRaUGGtkly6ia/BE9o5xaRsbu2PmNU=@vger.kernel.org X-Gm-Message-State: AOJu0YzBPLlfKvo5L/jxbgU7dk8caBH596ofGOPqv9zVRZiAsnsAF8Lq 0nZZ/EMUmJ3DSkq2raLxePidrSqlOpLuYsaW+8e62IdkvcczfYmrXMeTy1vVM81mAwjf3CACkHU 004HQQhuQHchXeKxWwCq6Psm3Ka1RYRzW3Q/yvludes49eUZsc+b2N7S9aeU= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2912:b0:675:a8c0:93e9 with SMTP id 006d021491bc7-67769f6da68mr1244026eaf.79.1771013250821; Fri, 13 Feb 2026 12:07:30 -0800 (PST) Date: Fri, 13 Feb 2026 12:07:30 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698f8482.a70a0220.2c38d7.00ca.GAE@google.com> Subject: [syzbot] [net?] BUG: unable to handle kernel paging request in ip_route_output_key_hash_rcu From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 2eba5e05d9bc Merge tag 'loongarch-fixes-6.18-2' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=125498b4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a1db0fea040c2a9f dashboard link: https://syzkaller.appspot.com/bug?extid=334190e097a98a1b81bb compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16ebaa12580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15848e92580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-2eba5e05.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ea041b2f66b0/vmlinux-2eba5e05.xz kernel image: https://storage.googleapis.com/syzbot-assets/a9a26c9a2a1c/bzImage-2eba5e05.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+334190e097a98a1b81bb@syzkaller.appspotmail.com BUG: unable to handle page fault for address: ffffed1011ae5e00 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 5ffcd067 P4D 5ffcd067 PUD 2fff7067 PMD 0 Oops: Oops: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5500 Comm: syz.0.18 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:__mkroute_output net/ipv4/route.c:2649 [inline] RIP: 0010:ip_route_output_key_hash_rcu+0x12fc/0x23e0 net/ipv4/route.c:2875 Code: 4c 8b 35 2f ea bc 08 49 83 c7 38 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 ce 38 75 f8 4d 03 37 4c 89 f0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 f7 e8 b6 38 75 f8 4d 8b 36 e8 9e 72 96 01 RSP: 0018:ffffc9000298e948 EFLAGS: 00010a06 RAX: 1ffff11011ae5e00 RBX: 0000000080000000 RCX: ffff888000bdc900 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffff888000bdc900 R09: 0000000000000003 R10: 0000000000000005 R11: 0000000000000000 R12: ffffc9000298ebd3 R13: 0000000000000000 R14: ffff88808d72f000 R15: ffff888036590158 FS: 000055556855e500(0000) GS:ffff88808d72f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffed1011ae5e00 CR3: 0000000042bac000 CR4: 0000000000352ef0 Call Trace: ip_route_output_key_hash+0x174/0x280 net/ipv4/route.c:2705 __ip_route_output_key include/net/route.h:169 [inline] ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2932 ip_route_output_key include/net/route.h:179 [inline] sctp_v4_get_dst+0x3c7/0x1200 net/sctp/protocol.c:455 sctp_transport_route+0x118/0x2f0 net/sctp/transport.c:448 sctp_ootb_pkt_new+0x28b/0x3c0 net/sctp/sm_statefuns.c:6437 sctp_sf_abort_violation+0x14b/0xc60 net/sctp/sm_statefuns.c:4771 sctp_sf_violation_chunklen net/sctp/sm_statefuns.c:4830 [inline] sctp_sf_ootb+0x4df/0x7c0 net/sctp/sm_statefuns.c:-1 sctp_do_sm+0x1e7/0x5a20 net/sctp/sm_sideeffect.c:1172 sctp_endpoint_bh_rcv+0x591/0x7e0 net/sctp/endpointola.c:408 sctp_rcv+0x11dc/0x1870 net/sctp/input.c:243 ip_protocol_deliver_rcu+0x2e0/0x440 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:239 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6079 [inline] __netif_receive_skb+0x143/0x380 net/core/dev.c:6192 netif_receive_skb_internal net/core/dev.c:6278 [inline] netif_receive_skb+0x1cb/0x790 net/core/dev.c:6337 tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485 tun_get_user+0x2b65/0x3e90 drivers/net/tun.c:1953 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbd9ab8e1ff Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48 RSP: 002b:00007ffca504fd10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fbd9ade5fa0 RCX: 00007fbd9ab8e1ff RDX: 0000000000000032 RSI: 00002000000000c0 RDI: 00000000000000c8 RBP: 00007fbd9ac13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000032 R11: 0000000000000293 R12: 0000000000000000 R13: 00007fbd9ade5fa0 R14: 00007fbd9ade5fa0 R15: 0000000000000003 Modules linked in: CR2: ffffed1011ae5e00 ---[ end trace 0000000000000000 ]--- RIP: 0010:__mkroute_output net/ipv4/route.c:2649 [inline] RIP: 0010:ip_route_output_key_hash_rcu+0x12fc/0x23e0 net/ipv4/route.c:2875 Code: 4c 8b 35 2f ea bc 08 49 83 c7 38 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 ce 38 75 f8 4d 03 37 4c 89 f0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 f7 e8 b6 38 75 f8 4d 8b 36 e8 9e 72 96 01 RSP: 0018:ffffc9000298e948 EFLAGS: 00010a06 RAX: 1ffff11011ae5e00 RBX: 0000000080000000 RCX: ffff888000bdc900 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffff888000bdc900 R09: 0000000000000003 R10: 0000000000000005 R11: 0000000000000000 R12: ffffc9000298ebd3 R13: 0000000000000000 R14: ffff88808d72f000 R15: ffff888036590158 FS: 000055556855e500(0000) GS:ffff88808d72f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffed1011ae5e00 CR3: 0000000042bac000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 4c 8b 35 2f ea bc 08 mov 0x8bcea2f(%rip),%r14 # 0x8bcea36 7: 49 83 c7 38 add $0x38,%r15 b: 4c 89 f8 mov %r15,%rax e: 48 c1 e8 03 shr $0x3,%rax 12: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 16: 74 08 je 0x20 18: 4c 89 ff mov %r15,%rdi 1b: e8 ce 38 75 f8 call 0xf87538ee 20: 4d 03 37 add (%r15),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 f7 mov %r14,%rdi 33: e8 b6 38 75 f8 call 0xf87538ee 38: 4d 8b 36 mov (%r14),%r14 3b: e8 9e 72 96 01 call 0x19672de --- 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 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