WARNING in __dev_queue_xmit

Status: premoderation: reported C repro on 2026/08/08 00:18
Bug presence: origin:lts
[Documentation on labels]
Reported-by: syzbot+c99b6ca14fe3ad640857@syzkaller.appspotmail.com
First crash: 49d, last: 1h40m
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/08/18 lts (merge base) 8c9d5557c8e6 C [report] WARNING in __dev_queue_xmit
2026/08/18 upstream (ToT) 0f23d56f17fd C Didn't crash
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __dev_queue_xmit (3) net -1 syz, C error inconclusive 20 1176d 1199d 0/29 auto-obsoleted due to no activity on 2023/11/09 02:33
linux-5.15 WARNING in __dev_queue_xmit -1 syz, C 107 710d 795d 0/3 auto-obsoleted due to no activity on 2024/12/25 04:54
upstream WARNING in __dev_queue_xmit (6) prio:low net -1 syz, C error 56 14d 47d 28/29 upstream: reported C repro on 2026/08/10 15:02
linux-6.6 WARNING in __dev_queue_xmit -1 syz, C 28 34d 40d 0/2 upstream: reported C repro on 2026/08/17 21:29
upstream WARNING in __dev_queue_xmit (4) net -1 syz, C 387 705d 752d 28/29 fixed on 2024/10/22 11:57
upstream WARNING in __dev_queue_xmit -1 syz, C done 16774 1310d 1524d 22/29 fixed on 2023/02/24 14:17
upstream WARNING in __dev_queue_xmit (2) net -1 syz, C 76 1238d 1310d 22/29 fixed on 2023/06/08 14:41
upstream WARNING in __dev_queue_xmit (5) net -1 syz, C 41 649d 648d 28/29 fixed on 2025/05/06 15:33
linux-6.1 WARNING in __dev_queue_xmit (2) -1 syz, C 69 34d 49d 0/3 upstream: reported C repro on 2026/08/08 00:39
linux-6.1 WARNING in __dev_queue_xmit -1 43 710d 810d 0/3 auto-obsoleted due to no activity on 2024/12/25 04:13

Sample crash report:
------------[ cut here ]------------
skb_assert_len
WARNING: CPU: 1 PID: 313 at include/linux/skbuff.h:2720 skb_assert_len include/linux/skbuff.h:2720 [inline]
WARNING: CPU: 1 PID: 313 at include/linux/skbuff.h:2720 __dev_queue_xmit+0x1e1d/0x3780 net/core/dev.c:4462
Modules linked in:
CPU: 1 UID: 0 PID: 313 Comm: syz-executor349 Not tainted syzkaller #0 28bb5670a1b4a83370a1b0f1e6655e31af14d592
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:skb_assert_len include/linux/skbuff.h:2720 [inline]
RIP: 0010:__dev_queue_xmit+0x1e1d/0x3780 net/core/dev.c:4462
Code: 00 00 00 fc ff df e9 ea e6 ff ff e8 bd 35 05 fd c6 05 a5 1d 63 03 01 48 c7 c7 e0 1f 8b 86 48 c7 c6 16 a3 19 87 e8 53 0e 82 fc <0f> 0b 80 3d 8a 1d 63 03 01 0f 84 af e3 ff ff e8 8f 35 05 fd c6 05
RSP: 0018:ffffc900011ff500 EFLAGS: 00010246
RAX: 72e271acb1374600 RBX: ffff88810df9e1b0 RCX: ffff888125e2df00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc900011ff7e0 R08: ffff8881f6e294d3 R09: 1ffff1103edc529a
R10: dffffc0000000000 R11: ffffed103edc529b R12: 1ffff11021bf3c2a
R13: ffff88810df9e140 R14: 0000000000000000 R15: dffffc0000000000
FS:  000055555e3053c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e06abc5000 CR3: 000000010273c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 dev_queue_xmit include/linux/netdevice.h:3141 [inline]
 packet_xmit+0x76/0x360 net/packet/af_packet.c:276
 tpacket_snd net/packet/af_packet.c:2938 [inline]
 packet_sendmsg+0x228b/0x56b0 net/packet/af_packet.c:3165
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 sock_write_iter+0x445/0x490 net/socket.c:1148
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x75f/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7ff6be1a60c9
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdc961baa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007ff6be1a60c9
RDX: 0000000000000002 RSI: 0000200000000000 RDI: 0000000000000003
RBP: 00007ff6be211489 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007ff6be2113f1
R13: 0000000000000001 R14: 00007ffdc961bb00 R15: 0000000000000003
 </TASK>
---[ end trace 0000000000000000 ]---
skb len=0 headroom=128 headlen=0 tailroom=256
mac=(128,0) mac_len=0 net=(128,-1) trans=-1
shinfo(txflags=0 nr_frags=0 gso(size=0 type=0 segs=0))
csum(0x0 start=0 offset=0 ip_summed=0 complete_sw=0 valid=0 level=0)
hash(0x0 sw=0 l4=0) proto=0x0000 pkttype=0 iif=0
priority=0x0 mark=0x0 alloc_cpu=0 vlan_all=0x0
encapsulation=0 inner(proto=0x0000, mac=0, net=0, trans=0)
dev na

Crashes (268):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/30 01:40 android16-6.12 36bee94a7cf9 2f52988a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/08/28 12:53 android16-6.12 3ebc81d80f95 e2fa417d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/08/28 12:27 android16-6.12 3ebc81d80f95 e2fa417d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/08/28 11:44 android16-6.12 3ebc81d80f95 e2fa417d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/08/28 11:24 android16-6.12 3ebc81d80f95 e2fa417d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/08/18 03:54 android16-6.12 83f7e9ec53bb 1e72964b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/08/17 22:35 android16-6.12 b21af26d1628 905244d6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/08/17 22:07 android16-6.12 b21af26d1628 905244d6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/08/17 21:30 android16-6.12 b21af26d1628 905244d6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/08/08 01:09 android16-6.12 b54741372957 e4ef95d6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/08/08 00:46 android16-6.12 b54741372957 e4ef95d6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/26 20:07 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/26 08:30 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/25 23:24 android16-6.12 09f588c04484 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/25 21:12 android16-6.12 09f588c04484 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/25 17:42 android16-6.12 09f588c04484 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/25 14:40 android16-6.12 558b94a8d268 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/25 12:27 android16-6.12 558b94a8d268 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/25 10:21 android16-6.12 558b94a8d268 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/25 03:26 android16-6.12 558b94a8d268 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/24 21:38 android16-6.12 a24919af1c4d 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/24 20:03 android16-6.12 a24919af1c4d 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/24 17:27 android16-6.12 a24919af1c4d 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/24 10:58 android16-6.12 a24919af1c4d 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/24 04:24 android16-6.12 a24919af1c4d 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/24 02:57 android16-6.12 a24919af1c4d 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/23 20:01 android16-6.12 a24919af1c4d abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/23 16:35 android16-6.12 a24919af1c4d abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/23 15:15 android16-6.12 c8909f7cf138 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/23 14:58 android16-6.12 c8909f7cf138 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/23 13:35 android16-6.12 c8909f7cf138 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/23 12:03 android16-6.12 c8909f7cf138 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/23 08:46 android16-6.12 c8909f7cf138 5207b90e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/23 02:07 android16-6.12 c8909f7cf138 5207b90e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/22 15:31 android16-6.12 7e3ff613a36b e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/22 11:18 android16-6.12 7e3ff613a36b e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/22 05:55 android16-6.12 7e3ff613a36b e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/21 20:40 android16-6.12 3b5131b275d2 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/21 06:16 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/21 01:57 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/20 23:36 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/20 21:47 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/19 17:28 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/19 05:48 android16-6.12 fb15c16e04b2 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/18 17:13 android16-6.12 17176090d7cd 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/18 13:28 android16-6.12 17176090d7cd 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/18 10:15 android16-6.12 17176090d7cd 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/17 23:22 android16-6.12 e79b240621d0 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/17 08:25 android16-6.12 09f57006a67d 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/17 00:26 android16-6.12 09f57006a67d 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/16 13:40 android16-6.12 1107981d2d5c 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/16 13:40 android16-6.12 1107981d2d5c 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/16 09:09 android16-6.12 1107981d2d5c 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/16 00:45 android16-6.12 5c165027e17c 2daa4bb5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/15 16:52 android16-6.12 5c165027e17c 2daa4bb5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/14 07:59 android16-6.12 8eff909dd82d 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/14 06:32 android16-6.12 8eff909dd82d 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/13 16:47 android16-6.12 8eff909dd82d 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/13 10:48 android16-6.12 8eff909dd82d 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/13 08:19 android16-6.12 8eff909dd82d 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
* Struck through repros no longer work on HEAD.