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WARNING in lowpan_xmit (2)

Status: upstream: reported C repro on 2025/06/24 20:30
Subsystems: wpan
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+5b74e0e96f12e3728ec8@syzkaller.appspotmail.com
First crash: 349d, last: 9h07m
Cause bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
856e0118-ba5a-4554-ba71-6731c566d34d assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in lowpan_xmit (2) 2026/05/24 11:19 2026/05/24 11:19 2026/05/24 12:19 c69befb30ac10e158cc9d1557b508ee3f0eca1de
▶ ▼ Discussions (7)
Title Replies (including bot) Last reply
[syzbot] Monthly wpan report (Apr 2026) 0 (1) 2026/04/29 20:32
[syzbot] Monthly wpan report (Mar 2026) 0 (1) 2026/03/31 08:07
[syzbot] Monthly wpan report (Feb 2026) 0 (1) 2026/02/26 12:59
[syzbot] Monthly wpan report (Jan 2026) 0 (1) 2026/01/26 07:12
[syzbot] [wpan?] WARNING in lowpan_xmit (2) 0 (2) 2026/01/10 07:57
[syzbot] Monthly wpan report (Dec 2025) 0 (1) 2025/12/26 07:48
[syzbot] Monthly wpan report (Sep 2025) 0 (1) 2025/09/17 08:29
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in lowpan_xmit wpan -1 2 630d 721d 0/29 auto-obsoleted due to no activity on 2024/12/22 09:15
▶ ▼ Last patch testing requests (4)
Created Duration User Patch Repo Result
2026/04/14 18:59 17m retest repro upstream report log
2026/02/28 04:30 4h07m retest repro net-next report log
2026/02/03 18:18 12m retest repro upstream error
2025/07/04 23:20 25m retest repro net-next OK log
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/12/13 17:56 5h02m bisect fix net-next OK (0) job log log

Sample crash report:
ieee802154 phy0 wpan0: encryption failed: -22
ieee802154 phy1 wpan1: encryption failed: -22
------------[ cut here ]------------
WARNING: ./include/linux/skbuff.h:3227 at skb_network_header_len include/linux/skbuff.h:3227 [inline], CPU#1: aoe_tx0/1301
WARNING: ./include/linux/skbuff.h:3227 at lowpan_header net/ieee802154/6lowpan/tx.c:236 [inline], CPU#1: aoe_tx0/1301
WARNING: ./include/linux/skbuff.h:3227 at lowpan_xmit+0xea9/0x1210 net/ieee802154/6lowpan/tx.c:282, CPU#1: aoe_tx0/1301
Modules linked in:
CPU: 1 UID: 0 PID: 1301 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:skb_network_header_len include/linux/skbuff.h:3227 [inline]
RIP: 0010:lowpan_header net/ieee802154/6lowpan/tx.c:236 [inline]
RIP: 0010:lowpan_xmit+0xea9/0x1210 net/ieee802154/6lowpan/tx.c:282
Code: ff ff 4c 89 ff 48 01 81 38 02 00 00 e8 30 d8 0f fe e9 e6 fb ff ff e8 46 a3 8f f6 90 0f 0b 90 e9 a3 f5 ff ff e8 38 a3 8f f6 90 <0f> 0b 90 e9 86 f6 ff ff e8 2a a3 8f f6 0f b7 8d e0 fe ff ff 44 8b
RSP: 0018:ffffc9000476f860 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffc9000476f8e0 RCX: ffffffff8b2ebe6c
RDX: ffff888028a3bd00 RSI: ffffffff8b2ec7e8 RDI: 0000000000000003
RBP: ffffc9000476f9f0 R08: 0000000000000003 R09: 000000000000ffff
R10: 000000000000ffff R11: 0000000000000000 R12: ffff88801d79a476
R13: 000000000000ffff R14: ffff888028234d90 R15: ffff88801d79a3c0
FS:  0000000000000000(0000) GS:ffff8881249fa000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c007868000 CR3: 0000000071880000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __netdev_start_xmit include/linux/netdevice.h:5273 [inline]
 netdev_start_xmit include/linux/netdevice.h:5282 [inline]
 xmit_one net/core/dev.c:3853 [inline]
 dev_hard_start_xmit+0x97/0x6e0 net/core/dev.c:3869
 __dev_queue_xmit+0x6d7/0x46b0 net/core/dev.c:4819
 dev_queue_xmit include/linux/netdevice.h:3381 [inline]
 tx+0xcc/0x190 drivers/block/aoe/aoenet.c:62
 kthread+0x1e4/0x3e0 drivers/block/aoe/aoecmd.c:1241
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

Crashes (1653):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/10 07:57 upstream 372800cb95a3 d1b870e1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in lowpan_xmit
2026/02/12 23:53 net-next 37a93dd5c49b 504cb1bf .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in lowpan_xmit
2026/06/05 10:49 upstream 9154c4af7829 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/04 23:19 upstream 9154c4af7829 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in lowpan_xmit
2026/06/04 21:46 upstream 9154c4af7829 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/04 20:01 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/04 18:10 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/04 16:19 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/04 14:14 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/04 13:01 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/04 09:28 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in lowpan_xmit
2026/06/04 07:23 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/04 07:22 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/04 05:41 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/03 23:54 upstream ba3e43a9e601 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/03 22:22 upstream ba3e43a9e601 234057e5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/03 20:41 upstream ba3e43a9e601 234057e5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/03 11:32 upstream ba3e43a9e601 234057e5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/03 11:10 upstream ba3e43a9e601 234057e5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/03 09:36 upstream ba3e43a9e601 3c0d2131 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/03 07:55 upstream ba3e43a9e601 3c0d2131 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in lowpan_xmit
2026/06/03 06:26 upstream ba3e43a9e601 3c0d2131 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/03 06:18 upstream ba3e43a9e601 3c0d2131 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/03 05:05 upstream ba3e43a9e601 3c0d2131 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in lowpan_xmit
2026/06/03 03:38 upstream ba3e43a9e601 3c0d2131 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in lowpan_xmit
2026/06/03 03:38 upstream ba3e43a9e601 3c0d2131 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in lowpan_xmit
2026/06/02 11:03 upstream 6f3ed7fec72f 62fe1528 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/02 08:15 upstream 6f3ed7fec72f 1095583b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in lowpan_xmit
2026/06/02 07:33 upstream e43ffb69e043 1095583b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/01 21:20 upstream e43ffb69e043 1095583b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/01 19:51 upstream e43ffb69e043 8d8eeb3a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/01 11:09 upstream e43ffb69e043 8d8eeb3a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/06/01 05:41 upstream e43ffb69e043 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in lowpan_xmit
2026/05/31 23:04 upstream 8d9c51eac648 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/31 23:03 upstream 8d9c51eac648 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/31 21:17 upstream 174914ea5513 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/31 20:06 upstream 174914ea5513 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/31 18:40 upstream 174914ea5513 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/31 13:53 upstream 174914ea5513 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/31 11:52 upstream 174914ea5513 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/31 10:02 upstream 174914ea5513 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/31 01:40 upstream 174914ea5513 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/31 01:09 upstream 9d87d0fc8c8e 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in lowpan_xmit
2026/05/30 18:53 upstream f5e5d3509bff 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/30 12:06 upstream f5e5d3509bff 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in lowpan_xmit
2026/05/30 08:58 upstream 9215e74f228f 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/30 07:00 upstream 9215e74f228f 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in lowpan_xmit
2026/05/29 22:43 upstream 9215e74f228f 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in lowpan_xmit
2026/05/22 11:57 upstream 6779b50faa56 e16cf9f3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in lowpan_xmit
2026/01/20 17:48 upstream 24d479d26b25 d1b870e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in lowpan_xmit
2026/05/29 17:21 upstream 8fde5d1d47f6 a3d70215 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in lowpan_xmit
2026/05/05 07:30 upstream c7e4e4d5f7dc a898ba9c .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in lowpan_xmit
2026/05/05 21:16 upstream 9207d47f966b 26da2c66 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in lowpan_xmit
2026/06/01 18:06 net f3be0c984ecb 8d8eeb3a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in lowpan_xmit
2026/05/22 21:17 net-next bde2a04d9b6f e16cf9f3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in lowpan_xmit
2025/06/20 23:05 net-next 4f4040ea5d3e e3003213 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in lowpan_xmit
2026/06/03 02:15 linux-next f7af91adc230 3c0d2131 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in lowpan_xmit
2026/05/22 09:33 linux-next 550604d6c9b9 e16cf9f3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in lowpan_xmit
* Struck through repros no longer work on HEAD.