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: 65d, last: 1d03h
▶ ▼ 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 1192d 1215d 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 726d 811d 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 30d 63d 28/29 upstream: reported C repro on 2026/08/10 15:02
linux-6.6 WARNING in __dev_queue_xmit -1 syz, C error 28 50d 55d 0/2 upstream: reported C repro on 2026/08/17 21:29
upstream WARNING in __dev_queue_xmit (4) net -1 syz, C 387 721d 768d 28/29 fixed on 2024/10/22 11:57
upstream WARNING in __dev_queue_xmit -1 syz, C done 16774 1326d 1540d 22/29 fixed on 2023/02/24 14:17
upstream WARNING in __dev_queue_xmit (2) net -1 syz, C 76 1254d 1326d 22/29 fixed on 2023/06/08 14:41
upstream WARNING in __dev_queue_xmit (5) net -1 syz, C 41 665d 664d 28/29 fixed on 2025/05/06 15:33
linux-6.1 WARNING in __dev_queue_xmit (2) -1 syz, C error 69 50d 65d 0/3 upstream: reported C repro on 2026/08/08 00:39
linux-6.1 WARNING in __dev_queue_xmit -1 43 726d 826d 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 (332):
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
2026/10/11 16:44 android16-6.12 c82b35cb007f 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/09 19:58 android16-6.12 e65d894191a4 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/09 01:34 android16-6.12 e65d894191a4 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/08 16:30 android16-6.12 c7ad8c94d619 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/08 12:38 android16-6.12 c7ad8c94d619 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/08 05:58 android16-6.12 c7ad8c94d619 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/08 04:57 android16-6.12 c7ad8c94d619 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/07 22:01 android16-6.12 7e73c6dc7aaf 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/07 16:36 android16-6.12 7e73c6dc7aaf 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/07 07:25 android16-6.12 85581c945c56 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/06 19:10 android16-6.12 02e193b62eb3 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/06 03:05 android16-6.12 31493cc8d965 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/05 12:25 android16-6.12 3a7d1771d492 af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/05 10:44 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/05 06:52 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/05 05:26 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/05 00:42 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/04 19:25 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/04 18:12 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/04 15:14 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/04 12:59 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/04 07:30 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/04 03:09 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/03 19:44 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/03 17:26 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/03 15:55 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/03 03:22 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/02 22:07 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/02 05:54 android16-6.12 3a7d1771d492 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/02 02:29 android16-6.12 f82d63769e69 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/01 22:59 android16-6.12 f82d63769e69 f5cdae2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/01 11:58 android16-6.12 f82d63769e69 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/01 10:03 android16-6.12 f82d63769e69 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/01 04:37 android16-6.12 dfd0de11e80f 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/10/01 01:06 android16-6.12 dfd0de11e80f 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/30 14:28 android16-6.12 7b10fdf41f2b 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/30 02:54 android16-6.12 c95e515a6be2 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/29 13:08 android16-6.12 da245f6c05a1 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/29 04:13 android16-6.12 da245f6c05a1 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/28 22:33 android16-6.12 da245f6c05a1 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __dev_queue_xmit
2026/09/28 17:43 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
2026/09/28 12:35 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
2026/09/28 08:47 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
* Struck through repros no longer work on HEAD.