kernel BUG in net_dm_packet_work (2)

Status: upstream: reported on 2026/09/11 11:45
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+586af68eb819833c2d91@syzkaller.appspotmail.com
First crash: 1d10h, last: 17h32m
Discussions (2)
Title Replies (including bot) Last reply
[PATCH net] net: skbuff: do not leave stale header offsets after pskb_carve() 7 (7) 2026/09/12 15:40
[syzbot] [net?] kernel BUG in net_dm_packet_work (2) 0 (1) 2026/09/11 11:45
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in net_dm_packet_work net -1 1 244d 244d 0/29 auto-obsoleted due to no activity on 2026/04/19 06:56

Sample crash report:
skb frag:     00000100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
skb frag:     00000110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
skb frag:     00000120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
------------[ cut here ]------------
kernel BUG at ./include/linux/skbuff.h:2847!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 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
Workqueue: events net_dm_packet_work
RIP: 0010:__skb_pull include/linux/skbuff.h:2847 [inline]
RIP: 0010:skb_pull_inline include/linux/skbuff.h:2854 [inline]
RIP: 0010:skb_pull.cold+0x29/0x2b net/core/skbuff.c:2677
Code: 0b e8 8b b2 9c 00 44 89 65 70 89 de 48 c7 c7 20 cd 38 8d e8 d9 e5 b2 ff 31 d2 48 89 ee 48 c7 c7 60 cd 38 8d e8 08 3e 26 08 90 <0f> 0b e8 60 b2 9c 00 4c 89 e2 be 01 00 00 00 48 c7 c7 e0 f7 ca 90
RSP: 0018:ffffc900000d79f0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 00000000000000ea RCX: 0000000000000000
RDX: ffff88801eeda580 RSI: ffffffff816f5fbe RDI: ffff88801eeda580
RBP: ffff888038a7e640 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000ac8
R13: 00000000000009de R14: 0000000000000ac8 R15: ffff888038a7e640
FS:  0000000000000000(0000) GS:ffff8880d5b5c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3dfcbed158 CR3: 000000002c5c9000 CR4: 0000000000352ef0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 net_dm_packet_report net/core/drop_monitor.c:700 [inline]
 net_dm_packet_work+0xafd/0x1290 net/core/drop_monitor.c:739
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/11 23:48 upstream 3026c6e4f223 70a60e12 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream kernel BUG in net_dm_packet_work
2026/09/11 06:42 upstream 08df884136f1 1fe56c0a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream kernel BUG in net_dm_packet_work
* Struck through repros no longer work on HEAD.