syzbot


kernel BUG in __skb_gso_segment

Status: upstream: reported C repro on 2022/06/04 01:02
Reported-by: syzbot+7160965e6a93d826048a@syzkaller.appspotmail.com
Fix commit: e9d3f80935b6 net/af_packet: make sure to pull mac header
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64]
First crash: 251d, last: 249d

Cause bisection: introduced by (bisect log) :
commit dfed913e8b55a0c2c4906f1242fd38fd9a116e49
Author: Hangbin Liu <liuhangbin@gmail.com>
Date: Mon Apr 25 01:45:02 2022 +0000

  net/af_packet: add VLAN support for AF_PACKET SOCK_RAW GSO

Crash: kernel BUG in __skb_gso_segment (log)
Repro: C syz .config
similar bugs (7):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 kernel BUG in __skb_gso_segment C error 1 53d 53d 2/2 fixed on 2023/02/02 00:40
android-54 kernel BUG in __skb_gso_segment C 1 54d 54d 0/2 upstream: reported C repro on 2022/12/14 21:43
android-5-10 kernel BUG in __skb_gso_segment C error 1 54d 54d 0/2 upstream: reported C repro on 2022/12/14 22:03
android-44 kernel BUG at include/linux/skbuff.h:LINE! C 3 1804d 1808d 0/2 closed as invalid on 2019/04/03 06:33
upstream kernel BUG at include/linux/skbuff.h:LINE! 3 1659d 1667d 12/24 fixed on 2018/10/31 02:03
linux-4.14 kernel BUG at include/linux/skbuff.h:LINE! C 184 4d23h 761d 0/1 upstream: reported C repro on 2021/01/06 05:53
upstream kernel BUG at include/linux/skbuff.h:LINE! (2) C done 58 1260d 1270d 14/24 fixed on 2019/10/15 23:40
Last patch testing requests:
Created Duration User Patch Repo Result
2022/06/04 07:29 15m hdanton@sina.com https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e9d3f80935b6 OK

Sample crash report:
------------[ cut here ]------------
kernel BUG at include/linux/skbuff.h:2699!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3605 Comm: syz-executor276 Not tainted 5.18.0-syzkaller-11338-g2c5ca23f7414 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__skb_pull include/linux/skbuff.h:2699 [inline]
RIP: 0010:skb_mac_gso_segment+0x48f/0x530 net/core/gro.c:136
Code: 00 48 c7 c7 00 96 d4 8a c6 05 cb d3 45 06 01 e8 26 bb d0 01 e9 2f fd ff ff 49 c7 c4 ea ff ff ff e9 f1 fe ff ff e8 91 84 19 fa <0f> 0b 48 89 df e8 97 44 66 fa e9 7f fd ff ff e8 ad 44 66 fa e9 48
RSP: 0018:ffffc90002eef4b8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000012 RCX: 0000000000000000
RDX: ffff888024ad8000 RSI: ffffffff8760ed0f RDI: 0000000000000004
RBP: 0000000000005dbc R08: 0000000000000004 R09: 0000000000000fe0
R10: 0000000000000fe4 R11: 0000000000000000 R12: 0000000000000fe0
R13: ffff888015ce33c0 R14: 1ffff920005dde9b R15: 0000000000000012
FS:  0000555556326300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200015c0 CR3: 0000000071cc8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __skb_gso_segment+0x327/0x6e0 net/core/dev.c:3411
 skb_gso_segment include/linux/netdevice.h:4749 [inline]
 validate_xmit_skb+0x6bc/0xf10 net/core/dev.c:3669
 validate_xmit_skb_list+0xbc/0x120 net/core/dev.c:3719
 sch_direct_xmit+0x3d1/0xbe0 net/sched/sch_generic.c:327
 __dev_xmit_skb net/core/dev.c:3815 [inline]
 __dev_queue_xmit+0x14a1/0x3a00 net/core/dev.c:4219
 packet_snd net/packet/af_packet.c:3071 [inline]
 packet_sendmsg+0x21cb/0x5550 net/packet/af_packet.c:3102
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2492
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546
 __sys_sendmsg net/socket.c:2575 [inline]
 __do_sys_sendmsg net/socket.c:2584 [inline]
 __se_sys_sendmsg net/socket.c:2582 [inline]
 __x64_sys_sendmsg+0x132/0x220 net/socket.c:2582
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f0fbee4b709
Code: 28 c3 e8 4a 15 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd929489f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ffd92948a20 RCX: 00007f0fbee4b709
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000003 R08: bb1414ac92948a27 R09: bb1414ac92948a27
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd92948a10 R14: 00007ffd92948a08 R15: 00007ffd92948a04
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__skb_pull include/linux/skbuff.h:2699 [inline]
RIP: 0010:skb_mac_gso_segment+0x48f/0x530 net/core/gro.c:136
Code: 00 48 c7 c7 00 96 d4 8a c6 05 cb d3 45 06 01 e8 26 bb d0 01 e9 2f fd ff ff 49 c7 c4 ea ff ff ff e9 f1 fe ff ff e8 91 84 19 fa <0f> 0b 48 89 df e8 97 44 66 fa e9 7f fd ff ff e8 ad 44 66 fa e9 48
RSP: 0018:ffffc90002eef4b8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000012 RCX: 0000000000000000
RDX: ffff888024ad8000 RSI: ffffffff8760ed0f RDI: 0000000000000004
RBP: 0000000000005dbc R08: 0000000000000004 R09: 0000000000000fe0
R10: 0000000000000fe4 R11: 0000000000000000 R12: 0000000000000fe0
R13: ffff888015ce33c0 R14: 1ffff920005dde9b R15: 0000000000000012
FS:  0000555556326300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200015c0 CR3: 0000000071cc8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (11):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kasan-gce 2022/05/31 03:09 upstream 2c5ca23f7414 af70c3a9 .config strace log report syz C kernel BUG in __skb_gso_segment
ci-upstream-kasan-gce 2022/05/31 01:32 upstream 2c5ca23f7414 af70c3a9 .config strace log report syz C kernel BUG in __skb_gso_segment
ci-upstream-kasan-gce-root 2022/05/31 01:13 upstream 2c5ca23f7414 af70c3a9 .config strace log report syz C kernel BUG in __skb_gso_segment
ci-upstream-net-this-kasan-gce 2022/05/31 02:01 net 90343f573252 af70c3a9 .config strace log report syz C kernel BUG in __skb_gso_segment
ci-upstream-net-this-kasan-gce 2022/05/31 01:40 net 90343f573252 af70c3a9 .config strace log report syz C kernel BUG in __skb_gso_segment
ci-upstream-net-kasan-gce 2022/05/31 02:00 net-next 7e062cda7d90 af70c3a9 .config strace log report syz C kernel BUG in __skb_gso_segment
ci-upstream-net-kasan-gce 2022/05/31 01:41 net-next 7e062cda7d90 af70c3a9 .config strace log report syz C kernel BUG in __skb_gso_segment
ci-upstream-kasan-gce 2022/05/31 01:04 upstream 2c5ca23f7414 af70c3a9 .config console log report info kernel BUG in __skb_gso_segment
ci-upstream-kasan-gce-root 2022/05/31 00:54 upstream 2c5ca23f7414 af70c3a9 .config console log report info kernel BUG in __skb_gso_segment
ci-upstream-net-kasan-gce 2022/06/02 05:51 net-next 7e062cda7d90 b4bc6a3d .config console log report info kernel BUG in __skb_gso_segment
ci-upstream-net-kasan-gce 2022/06/02 04:27 net-next 7e062cda7d90 b4bc6a3d .config console log report info kernel BUG in __skb_gso_segment
* Struck through repros no longer work on HEAD.