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a640c23a62f3a-a7a3c91e09csm67418466b.155.2024.07.19.12.34.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jul 2024 12:34:13 -0700 (PDT) From: Jakub Sitnicki To: Eric Dumazet Cc: Paolo Abeni , syzbot , davem@davemloft.net, dsahern@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, soheil@google.com, syzkaller-bugs@googlegroups.com, willemb@google.com, kernel-team@cloudflare.com Subject: Re: [syzbot] [net?] WARNING in skb_warn_bad_offload (5) In-Reply-To: (Eric Dumazet's message of "Tue, 16 Jul 2024 07:54:00 -0700") References: <000000000000e1609a061d5330ce@google.com> <5e4905d7-32e1-4359-9720-a32330aec424@redhat.com> <87wmll7i9n.fsf@cloudflare.com> User-Agent: mu4e 1.12.4; emacs 29.1 Date: Fri, 19 Jul 2024 21:34:11 +0200 Message-ID: <87o76t6urw.fsf@cloudflare.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Tue, Jul 16, 2024 at 07:54 AM -07, Eric Dumazet wrote: > On Tue, Jul 16, 2024 at 3:17=E2=80=AFAM Jakub Sitnicki wrote: >> >> On Tue, Jul 16, 2024 at 12:04 PM +02, Paolo Abeni wrote: >> > On 7/16/24 03:23, syzbot wrote: >> >> syzbot found the following issue on: >> >> HEAD commit: 80ab5445da62 Merge tag 'wireless-next-2024-07-11' of = git:/.. >> >> git tree: net-next >> >> console+strace: https://syzkaller.appspot.com/x/log.txt?x=3D175fb8219= 80000 >> >> kernel config: https://syzkaller.appspot.com/x/.config?x=3D2dbcdd864= 1c4638f >> >> dashboard link: https://syzkaller.appspot.com/bug?extid=3De15b7e15b8a= 751a91d9a >> >> 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=3D172bf56= 6980000 >> >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D12fff5359= 80000 >> >> Downloadable assets: >> >> disk image: https://storage.googleapis.com/syzbot-assets/184da3869c30= /disk-80ab5445.raw.xz >> >> vmlinux: https://storage.googleapis.com/syzbot-assets/85bfe9b60f21/vm= linux-80ab5445.xz >> >> kernel image: https://storage.googleapis.com/syzbot-assets/06064623a9= 48/bzImage-80ab5445.xz >> >> The issue was bisected to: >> >> commit 10154dbded6d6a2fecaebdfda206609de0f121a9 >> >> Author: Jakub Sitnicki >> >> Date: Wed Jun 26 17:51:26 2024 +0000 >> >> udp: Allow GSO transmit from devices with no checksum offload >> >> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=3D142ccb= ed980000 >> >> final oops: https://syzkaller.appspot.com/x/report.txt?x=3D162ccb= ed980000 >> >> console output: https://syzkaller.appspot.com/x/log.txt?x=3D122ccbed9= 80000 >> >> IMPORTANT: if you fix the issue, please add the following tag to the = commit: >> >> Reported-by: syzbot+e15b7e15b8a751a91d9a@syzkaller.appspotmail.com >> >> Fixes: 10154dbded6d ("udp: Allow GSO transmit from devices with no ch= ecksum offload") >> >> skb frag: 00000080: 62 3f 77 e4 0e 82 0d 2f 85 cc 44 ea 25 5a 99 = 76 >> >> skb frag: 00000090: f2 53 >> >> ------------[ cut here ]------------ >> >> ip6tnl0: caps=3D(0x00000006401d7869, 0x00000006401d7869) >> >> WARNING: CPU: 0 PID: 5112 at net/core/dev.c:3293 skb_warn_bad_offload= +0x166/0x1a0 net/core/dev.c:3291 >> >> Modules linked in: >> >> CPU: 0 PID: 5112 Comm: syz-executor391 Not tainted 6.10.0-rc7-syzkall= er-01603-g80ab5445da62 #0 >> >> Hardware name: Google Google Compute Engine/Google Compute Engine, BI= OS Google 06/07/2024 >> >> RIP: 0010:skb_warn_bad_offload+0x166/0x1a0 net/core/dev.c:3291 >> >> Code: e8 5f 94 a3 f8 49 8b 04 24 48 8d 88 a0 03 00 00 48 85 c0 48 0f = 44 cd 48 c7 c7 00 cc c5 8c 4c 89 f6 48 89 da e8 fb 92 ff f7 90 <0f> 0b 90 9= 0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 44 89 f9 >> >> RSP: 0018:ffffc900034bedc8 EFLAGS: 00010246 >> >> RAX: 7d287cad4185da00 RBX: ffff888040cdc0b8 RCX: ffff888023d1bc00 >> >> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 >> >> RBP: ffffffff8cc5cbc0 R08: ffffffff815857b2 R09: fffffbfff1c39994 >> >> R10: dffffc0000000000 R11: fffffbfff1c39994 R12: ffff888022880518 >> >> R13: dffffc0000000000 R14: ffff888040cdc130 R15: ffff888040cdc130 >> >> FS: 000055556e9e9380(0000) GS:ffff8880b9400000(0000) knlGS:000000000= 0000000 >> >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> >> CR2: 0000000020001180 CR3: 000000007c876000 CR4: 00000000003506f0 >> >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> >> Call Trace: >> >> >> >> __skb_gso_segment+0x3be/0x4c0 net/core/gso.c:127 >> >> skb_gso_segment include/net/gso.h:83 [inline] >> >> validate_xmit_skb+0x585/0x1120 net/core/dev.c:3661 >> >> __dev_queue_xmit+0x17a4/0x3e90 net/core/dev.c:4415 >> >> neigh_output include/net/neighbour.h:542 [inline] >> >> ip6_finish_output2+0xffa/0x1680 net/ipv6/ip6_output.c:137 >> >> ip6_finish_output+0x41e/0x810 net/ipv6/ip6_output.c:222 >> >> ip6_send_skb+0x112/0x230 net/ipv6/ip6_output.c:1958 >> >> udp_v6_send_skb+0xbf5/0x1870 net/ipv6/udp.c:1292 >> >> udpv6_sendmsg+0x23b3/0x3270 net/ipv6/udp.c:1588 >> >> sock_sendmsg_nosec net/socket.c:730 [inline] >> >> __sock_sendmsg+0xef/0x270 net/socket.c:745 >> >> ____sys_sendmsg+0x525/0x7d0 net/socket.c:2585 >> >> ___sys_sendmsg net/socket.c:2639 [inline] >> >> __sys_sendmmsg+0x3b2/0x740 net/socket.c:2725 >> >> __do_sys_sendmmsg net/socket.c:2754 [inline] >> >> __se_sys_sendmmsg net/socket.c:2751 [inline] >> >> __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2751 >> >> do_syscall_x64 arch/x86/entry/common.c:52 [inline] >> >> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 >> >> entry_SYSCALL_64_after_hwframe+0x77/0x7f >> >> RIP: 0033:0x7f04f688fe89 >> >> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 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 f= 0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 >> >> RSP: 002b:00007ffeebc526e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 >> >> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f04f688fe89 >> >> RDX: 0000000000000001 RSI: 0000000020003cc0 RDI: 0000000000000003 >> >> RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000001 >> >> R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeebc52740 >> >> R13: 00007f04f68dd406 R14: 0000000000000003 R15: 00007ffeebc52720 >> >> >> > >> > Looking at the console log, the the relevant GSO packet is an UFO one = with >> > CSUM_NONE. commit 10154dbded6d6a2fecaebdfda206609de0f121a9 only adjust= the skb >> > csum for USO packets. @Jakub S. could you please have a look? >> >> Will do. Thanks for the hint. > > The trigger for the bug is the following : > > setsockopt(3, SOL_IPV6, IPV6_HOPOPTS, > "\0\3\0\0\0\0\0\0\5\2\0\0\0\1\0\302\4\200\0\0\0\5\2\0\6\302\4\0\0\0\1\302= "..., > 40) =3D 0 > > Some random IPV6_HOPTS, with multiple IPV6_TLV_JUMBO options > > Non GSO path sends a malformed packet just fine, but GSO complains loudly. > > (flowlabel 0x754ca, hlim 64, next-header Options (0) payload length: > 186) localhost > localhost: HBH > (pad1)(pad1)(pad1)(pad1)(pad1)(pad1)(rtalert: 0x0000) > (pad1)(padn)(jumbo: 2147483648 - payload len !=3D 0) (rtalert: 0x0006) > (jumbo: 1 - already seen) [|hbhopt] Thank you for the hint. Extracted a reproducer. Fix will follow. --8<-- ~ # cat repro.sh #!/usr/bin/env bash unshare -Urn bash </dev/null ethtool -K sink tx-udp-segmentation off >/dev/null ip -6 tunnel add ip6tnl mode ip6ip6 local fd11::1 remote fd11::2 ip link set dev ip6tnl up ip addr add fd00::1/48 dev ip6tnl python -c ''' from socket import * UDP_SEGMENT =3D 103 hopopts =3D b"\x00\x03\x00\x00\x00\x00\x00\x00\x05\x02\x00\x00\x00\x01\x00\= xc2\x04\x80\x00\x00\x00\x05\x02\x00\x06\xc2\x04\x00\x00\x00\x01\xc2\x04\x00= \x00\x00\x04\x00\x00\x00" s =3D socket(AF_INET6, SOCK_DGRAM) s.setsockopt(IPPROTO_IPV6, IPV6_HOPOPTS, hopopts) s.setsockopt(SOL_UDP, UDP_SEGMENT, 145) s.sendto(b"x" * 3000, ("fd00::2", 9)) ''' false EOF ~ # ./repro.sh [ 59.122084] skb len=3D3080 headroom=3D120 headlen=3D80 tailroom=3D0 [ 59.122084] mac=3D(120,0) mac_len=3D0 net=3D(120,72) trans=3D192 [ 59.122084] shinfo(txflags=3D0 nr_frags=3D1 gso(size=3D145 type=3D131072= segs=3D21)) [ 59.122084] csum(0x600c0 start=3D192 offset=3D6 ip_summed=3D0 complete_s= w=3D0 valid=3D0 level=3D0) [ 59.122084] hash(0xfd64b255 sw=3D1 l4=3D1) proto=3D0x86dd pkttype=3D0 ii= f=3D0 [ 59.122084] priority=3D0x0 mark=3D0x0 alloc_cpu=3D13 vlan_all=3D0x0 [ 59.122084] encapsulation=3D0 inner(proto=3D0x0000, mac=3D0, net=3D0, tr= ans=3D0) [ 59.122331] dev name=3Dip6tnl feat=3D0x00000006401d5869 [ 59.122362] sk family=3D10 type=3D2 proto=3D17 [ 59.122386] skb linear: 00000000: 60 0d 55 b2 0b e0 00 40 fd 00 00 00 = 00 00 00 00 [ 59.122428] skb linear: 00000010: 00 00 00 00 00 00 00 01 fd 00 00 00 = 00 00 00 00 [ 59.122473] skb linear: 00000020: 00 00 00 00 00 00 00 02 11 03 00 00 = 00 00 00 00 [ 59.122515] skb linear: 00000030: 05 02 00 00 00 01 00 c2 04 80 00 00 = 00 05 02 00 [ 59.122557] skb linear: 00000040: 06 c2 04 00 00 00 01 c2 ed fb 00 09 = 0b c0 05 d6 [ 59.122601] skb frag: 00000000: 78 78 78 78 78 78 78 78 78 78 78 78 = 78 78 78 78 [ 59.122653] skb frag: 00000010: 78 78 78 78 78 78 78 78 78 78 78 78 = 78 78 78 78 [ 59.122696] skb frag: 00000020: 78 78 78 78 78 78 78 78 78 78 78 78 = 78 78 78 78 [ 59.122739] skb frag: 00000030: 78 78 78 78 78 78 78 78 78 78 78 78 = 78 78 78 78 [ 59.122781] skb frag: 00000040: 78 78 78 78 78 78 78 78 78 78 78 78 = 78 78 78 78 [ 59.122824] skb frag: 00000050: 78 78 78 78 78 78 78 78 78 78 78 78 = 78 78 78 78 [ 59.122866] skb frag: 00000060: 78 78 78 78 78 78 78 78 78 78 78 78 = 78 78 78 78 [ 59.122914] skb frag: 00000070: 78 78 78 78 78 78 78 78 78 78 78 78 = 78 78 78 78 [ 59.122957] ------------[ cut here ]------------ [ 59.122987] ip6tnl: caps=3D(0x00000006401d5869, 0x0000000000000000) [ 59.123041] WARNING: CPU: 13 PID: 294 at net/core/dev.c:3291 skb_warn_ba= d_offload+0x86/0xd0 [ 59.123089] Modules linked in: [ 59.123113] CPU: 13 PID: 294 Comm: python Not tainted 6.10.0-rc7+ #44 [ 59.123149] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS = 1.16.2-debian-1.16.2-1 04/01/2014 [ 59.123197] RIP: 0010:skb_warn_bad_offload+0x86/0xd0 [ 59.123228] Code: e6 48 c7 c7 79 1b f4 bc 48 85 d2 48 8d 8a a0 03 00 00 = 48 8d 95 b8 00 00 00 48 0f 44 c8 48 85 ed 48 0f 44 d0 e8 fb 33 4b ff 90 <0f= > 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 80 bd 30 01 00 00 00 49 c7 [ 59.123322] RSP: 0018:ffffb25540993990 EFLAGS: 00010282 [ 59.123352] RAX: 0000000000000000 RBX: ffff9262027e6f00 RCX: 00000000000= 00000 [ 59.123395] RDX: 0000000000000000 RSI: ffffb25540993850 RDI: 00000000000= 00001 [ 59.123438] RBP: ffff926205ece000 R08: 00000000ffffdfff R09: 00000000000= 00001 [ 59.123486] R10: 00000000ffffdfff R11: ffffffffbd6a8420 R12: ffff926205e= ce130 [ 59.123529] R13: 000000000003078c R14: ffff9262027e6f00 R15: 00000000000= 00050 [ 59.123573] FS: 00007f5188eb1040(0000) GS:ffff92623eb40000(0000) knlGS:= 0000000000000000 [ 59.123620] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 59.123655] CR2: 0000000000661700 CR3: 00000000027aa000 CR4: 00000000007= 50ef0 [ 59.123699] PKRU: 55555554 [ 59.123715] Call Trace: [ 59.123733] [ 59.123751] ? __warn+0x8c/0x190 [ 59.123777] ? skb_warn_bad_offload+0x86/0xd0 [ 59.123808] ? report_bug+0x164/0x190 [ 59.123834] ? handle_bug+0x3b/0x70 [ 59.123860] ? exc_invalid_op+0x17/0x70 [ 59.123884] ? asm_exc_invalid_op+0x1a/0x20 [ 59.123920] ? skb_warn_bad_offload+0x86/0xd0 [ 59.123954] __skb_gso_segment+0xf0/0x170 [ 59.123981] validate_xmit_skb.isra.0+0x15e/0x2c0 [ 59.124011] __dev_queue_xmit+0x217/0x12e0 [ 59.124037] ? lock_acquire+0xc0/0x2d0 [ 59.124063] ? find_held_lock+0x2b/0x80 [ 59.124087] ? ip6_finish_output2+0x27a/0xb20 [ 59.124120] ? lock_release+0xbf/0x290 [ 59.124144] ? lockdep_hardirqs_on_prepare+0xda/0x1a0 [ 59.124175] ip6_finish_output2+0x27a/0xb20 [ 59.124201] ? ip6_mtu+0x9a/0x1c0 [ 59.124225] ? lock_release+0xbf/0x290 [ 59.124251] ip6_finish_output+0x27a/0x4d0 [ 59.124278] ip6_send_skb+0x36/0xb0 [ 59.124304] udp_v6_send_skb+0x1d6/0x480 [ 59.124331] udpv6_sendmsg+0xc04/0xf20 [ 59.124356] ? __lock_acquire+0xe9d/0x16d0 [ 59.124381] ? __pfx_ip_generic_getfrag+0x10/0x10 [ 59.124415] ? release_sock+0x1d/0xb0 [ 59.124441] ? find_held_lock+0x2b/0x80 [ 59.124464] ? find_held_lock+0x2b/0x80 [ 59.124491] ? __sys_sendto+0x123/0x1f0 [ 59.124516] __sys_sendto+0x123/0x1f0 [ 59.124544] ? __rseq_handle_notify_resume+0x42a/0x5c0 [ 59.124579] __x64_sys_sendto+0x24/0x30 [ 59.124603] do_syscall_64+0xbb/0x1d0 [ 59.124628] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 59.124660] RIP: 0033:0x7f5188fdca37 [ 59.124684] Code: 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f = 00 f3 0f 1e fa 80 3d 15 bb 0d 00 00 41 89 ca 74 10 b8 2c 00 00 00 0f 05 <48= > 3d 00 f0 ff ff 77 71 c3 55 48 83 ec 30 44 89 4c 24 2c 4c 89 44 [ 59.124775] RSP: 002b:00007ffe9b877698 EFLAGS: 00000202 ORIG_RAX: 000000= 000000002c [ 59.124817] RAX: ffffffffffffffda RBX: 00007ffe9b877738 RCX: 00007f5188f= dca37 [ 59.124860] RDX: 0000000000000bb8 RSI: 000000003998f950 RDI: 00000000000= 00003 [ 59.124903] RBP: 0000000000000000 R08: 00007ffe9b8777b0 R09: 00000000000= 0001c [ 59.124947] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000= 00000 [ 59.124990] R13: 0000000000000000 R14: 00000000004a86e2 R15: 0000000000a= 71a18 [ 59.125037] [ 59.125055] irq event stamp: 54030 [ 59.125078] hardirqs last enabled at (54040): [] cons= ole_unlock+0x10d/0x130 [ 59.125127] hardirqs last disabled at (54049): [] cons= ole_unlock+0xf2/0x130 [ 59.125176] softirqs last enabled at (53220): [] ___n= eigh_create+0x959/0xe30 [ 59.125224] softirqs last disabled at (53224): [] __de= v_queue_xmit+0x76/0x12e0 [ 59.125273] ---[ end trace 0000000000000000 ]--- ~ #