syzbot


WARNING in alb_determine_nd

Status: closed as invalid on 2026/05/30 03:53
Subsystems: net
Labels: prio:normal
[Documentation on labels]
First crash: 88d, last: 87d
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
4c29ea81-b843-4c4c-9a1a-3eff912827fe assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in alb_determine_nd 2026/05/14 15:11 2026/05/14 15:11 2026/05/14 15:59 6ccb967e465e832a7bfd7a116ad00d52a0923a5d

			
		

Sample crash report:
------------[ cut here ]------------
!skb_transport_header_was_set(skb)
WARNING: ./include/linux/skbuff.h:3072 at skb_transport_header include/linux/skbuff.h:3072 [inline], CPU#0: syz.8.5485/26187
WARNING: ./include/linux/skbuff.h:3072 at icmp6_hdr include/linux/icmpv6.h:11 [inline], CPU#0: syz.8.5485/26187
WARNING: ./include/linux/skbuff.h:3072 at alb_determine_nd drivers/net/bonding/bond_alb.c:1299 [inline], CPU#0: syz.8.5485/26187
WARNING: ./include/linux/skbuff.h:3072 at alb_determine_nd.isra.0+0x482/0x4f0 drivers/net/bonding/bond_alb.c:1284, CPU#0: syz.8.5485/26187
Modules linked in:
CPU: 0 UID: 0 PID: 26187 Comm: syz.8.5485 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:skb_transport_header include/linux/skbuff.h:3072 [inline]
RIP: 0010:icmp6_hdr include/linux/icmpv6.h:11 [inline]
RIP: 0010:alb_determine_nd drivers/net/bonding/bond_alb.c:1299 [inline]
RIP: 0010:alb_determine_nd.isra.0+0x482/0x4f0 drivers/net/bonding/bond_alb.c:1284
Code: 24 08 e8 c1 7c db fb e9 b2 fd ff ff 4c 89 ef e8 b4 7c db fb e9 d3 fd ff ff 41 bc 01 00 00 00 e9 1a fd ff ff e8 0f ee 6e fb 90 <0f> 0b 90 e9 2a fe ff ff 48 8b 7c 24 18 e8 bc 7c db fb e9 a4 fb ff
RSP: 0018:ffffc90003daf550 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 000000000000ffff RCX: ffffffff869a07da
RDX: ffff88802b1e0000 RSI: ffffffff869a09b1 RDI: ffff88802b1e0000
RBP: 000000000000003e R08: 0000000000000003 R09: 000000000000ffff
R10: 000000000000ffff R11: 0000000000000000 R12: 00000000000005ea
R13: 0000000000000000 R14: ffff8880130a6000 R15: 00000000000005ea
FS:  00007fabed68e6c0(0000) GS:ffff8880d633e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000192 CR3: 0000000037b79000 CR4: 0000000000352ef0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bond_xmit_alb_slave_get+0x5b9/0x1920 drivers/net/bonding/bond_alb.c:1470
 bond_alb_xmit+0x23/0x40 drivers/net/bonding/bond_alb.c:1528
 __bond_start_xmit drivers/net/bonding/bond_main.c:5569 [inline]
 bond_start_xmit+0xa7a/0x10d0 drivers/net/bonding/bond_main.c:5593
 __netdev_start_xmit include/linux/netdevice.h:5325 [inline]
 netdev_start_xmit include/linux/netdevice.h:5334 [inline]
 xmit_one net/core/dev.c:3883 [inline]
 dev_hard_start_xmit+0x121/0x7d0 net/core/dev.c:3899
 __dev_queue_xmit+0x32c1/0x4800 net/core/dev.c:4849
 dev_queue_xmit include/linux/netdevice.h:3385 [inline]
 packet_xmit+0x243/0x310 net/packet/af_packet.c:275
 packet_snd net/packet/af_packet.c:3076 [inline]
 packet_sendmsg+0x32f4/0x53c0 net/packet/af_packet.c:3108
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 __sys_sendto+0x468/0x4b0 net/socket.c:2206
 __do_sys_sendto net/socket.c:2213 [inline]
 __se_sys_sendto net/socket.c:2209 [inline]
 __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2209
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fabec79c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fabed68e028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fabeca15fa0 RCX: 00007fabec79c799
RDX: 00000000000005ea RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007fabec832c99 R08: 0000200000000180 R09: 0000000000000014
R10: 0000000000008001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabeca16038 R14: 00007fabeca15fa0 R15: 00007fff4f23bfe8
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/27 04:34 upstream 46b513250491 4b3d9a38 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in alb_determine_nd
2026/03/26 13:27 upstream 0138af2472df 4b3d9a38 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in alb_determine_nd
* Struck through repros no longer work on HEAD.