syzbot


kernel BUG in validate_xmit_skb

Status: auto-closed as invalid on 2021/06/10 04:03
Reported-by: syzbot+df827b4838ef76799a16@syzkaller.appspotmail.com
First crash: 504d, last: 504d
similar bugs (8):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 kernel BUG at net/core/dev.c:LINE! (2) C error 87 12d 565d 0/1 upstream: reported C repro on 2020/12/11 13:29
upstream kernel BUG at net/core/dev.c:LINE! (4) C done done 432 196d 583d 22/22 fixed on 2022/03/08 16:11
upstream kernel BUG at net/core/dev.c:LINE! (2) syz 2 1358d 1358d 12/22 fixed on 2018/10/18 14:43
upstream kernel BUG in netem_enqueue 2 19d 55d 21/22 internal: reported on 2022/05/04 17:12
linux-4.19 kernel BUG at net/core/dev.c:LINE! 4 795d 797d 0/1 auto-closed as invalid on 2020/08/23 07:17
upstream kernel BUG at net/core/dev.c:LINE! C 5 1675d 1680d 3/22 fixed on 2017/12/08 02:32
linux-4.14 kernel BUG at net/core/dev.c:LINE! C inconclusive 3 547d 816d 1/1 fixed on 2021/01/17 13:53
upstream kernel BUG at net/core/dev.c:LINE! (3) C done 979 665d 809d 17/22 fixed on 2020/09/16 22:51

Sample crash report:
audit: type=1804 audit(1612929773.452:35): pid=11194 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir014007831/syzkaller.qcG2yG/33/file0/bus" dev="ramfs" ino=32835 res=1
team0: Cannot enslave team device to itself
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'.
------------[ cut here ]------------
kernel BUG at net/core/dev.c:2648!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 11202 Comm: syz-executor.5 Not tainted 4.14.218-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a42e6180 task.stack: ffff88805da00000
RIP: 0010:skb_checksum_help+0x638/0x7d0 syzkaller/managers/linux-4-14/kernel/net/core/dev.c:2648
RSP: 0018:ffff88805da07088 EFLAGS: 00010212
RAX: 0000000000040000 RBX: 00000000000003d2 RCX: ffffc900133e6000
RDX: 000000000000a18a RSI: ffffffff85c08e78 RDI: ffff8880a1b9e45a
RBP: ffff8880a1b9e3c0 R08: ffff8880a1b9e440 R09: 00000000000202b4
R10: ffff8880a42e6aa8 R11: ffff8880a42e6180 R12: ffff8880a1b9e444
R13: ffff8880a1b9e48c R14: ffff8880a1b9e450 R15: 000000000000534c
FS:  00007f1bbefa3700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f522000 CR3: 0000000094425000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 skb_csum_hwoffload_help+0x6d/0xf0 syzkaller/managers/linux-4-14/kernel/net/core/dev.c:3055
 validate_xmit_skb+0x77a/0x9f0 syzkaller/managers/linux-4-14/kernel/net/core/dev.c:3097
 __dev_queue_xmit+0x816/0x2480 syzkaller/managers/linux-4-14/kernel/net/core/dev.c:3513
 neigh_hh_output syzkaller/managers/linux-4-14/kernel/./include/net/neighbour.h:490 [inline]
 neigh_output syzkaller/managers/linux-4-14/kernel/./include/net/neighbour.h:498 [inline]
 ip_finish_output2+0x9db/0x1340 syzkaller/managers/linux-4-14/kernel/net/ipv4/ip_output.c:230
 ip_finish_output+0x37c/0xc50 syzkaller/managers/linux-4-14/kernel/net/ipv4/ip_output.c:318
 NF_HOOK_COND syzkaller/managers/linux-4-14/kernel/./include/linux/netfilter.h:239 [inline]
 ip_output+0x1cd/0x510 syzkaller/managers/linux-4-14/kernel/net/ipv4/ip_output.c:406
 dst_output syzkaller/managers/linux-4-14/kernel/./include/net/dst.h:470 [inline]
 ip_local_out+0x93/0x170 syzkaller/managers/linux-4-14/kernel/net/ipv4/ip_output.c:125
 iptunnel_xmit+0x5cc/0x950 syzkaller/managers/linux-4-14/kernel/net/ipv4/ip_tunnel_core.c:91
 geneve_xmit_skb syzkaller/managers/linux-4-14/kernel/drivers/net/geneve.c:864 [inline]
 geneve_xmit+0xc94/0x2880 syzkaller/managers/linux-4-14/kernel/drivers/net/geneve.c:942
 __netdev_start_xmit syzkaller/managers/linux-4-14/kernel/./include/linux/netdevice.h:4039 [inline]
 netdev_start_xmit syzkaller/managers/linux-4-14/kernel/./include/linux/netdevice.h:4048 [inline]
 xmit_one syzkaller/managers/linux-4-14/kernel/net/core/dev.c:3005 [inline]
 dev_hard_start_xmit+0x188/0x890 syzkaller/managers/linux-4-14/kernel/net/core/dev.c:3021
 sch_direct_xmit+0x251/0x500 syzkaller/managers/linux-4-14/kernel/net/sched/sch_generic.c:186
 qdisc_restart syzkaller/managers/linux-4-14/kernel/net/sched/sch_generic.c:249 [inline]
 __qdisc_run+0x25d/0xe00 syzkaller/managers/linux-4-14/kernel/net/sched/sch_generic.c:257
 __dev_xmit_skb syzkaller/managers/linux-4-14/kernel/net/core/dev.c:3231 [inline]
 __dev_queue_xmit+0x13ac/0x2480 syzkaller/managers/linux-4-14/kernel/net/core/dev.c:3489
 packet_snd+0x1393/0x21e0 syzkaller/managers/linux-4-14/kernel/net/packet/af_packet.c:3024
 packet_sendmsg+0x1139/0x2ad0 syzkaller/managers/linux-4-14/kernel/net/packet/af_packet.c:3049
 sock_sendmsg_nosec syzkaller/managers/linux-4-14/kernel/net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 syzkaller/managers/linux-4-14/kernel/net/socket.c:656
 SYSC_sendto syzkaller/managers/linux-4-14/kernel/net/socket.c:1763 [inline]
 SyS_sendto+0x1c7/0x2c0 syzkaller/managers/linux-4-14/kernel/net/socket.c:1731
 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x465b09
RSP: 002b:00007f1bbefa3188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09
RDX: 0000000000003287 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 00000000004b069f R08: 0000000000000000 R09: 00000000000002ff
R10: 0000000004000002 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffe159e698f R14: 00007f1bbefa3300 R15: 0000000000022000
Code: be fb e9 c5 fd ff ff e8 47 90 94 fb 48 89 ef 41 bc ea ff ff ff e8 f9 f8 ff ff e9 4c fe ff ff e8 2f 90 94 fb 0f 0b e8 28 90 94 fb <0f> 0b 4c 89 f7 e8 6e 09 be fb e9 f5 f9 ff ff 4c 89 f7 e8 f1 0c 
RIP: skb_checksum_help+0x638/0x7d0 syzkaller/managers/linux-4-14/kernel/net/core/dev.c:2648 RSP: ffff88805da07088
---[ end trace 4562b2118eb7ac5b ]---

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-14 2021/02/10 04:03 linux-4.14.y 2c8a3fceddf0 2bd9619f .config log report info kernel BUG in validate_xmit_skb