WARNING in hwsim_hw_xmit

Status: upstream: reported on 2026/09/14 09:57
Subsystems: wpan
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+adb0bf16414b8bb2d799@syzkaller.appspotmail.com
First crash: 6d09h, last: 4h36m
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
368ddea7 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in hwsim_hw_xmit 2026/09/12 00:01 2026/09/12 00:01 2026/09/12 00:53 6816f32e
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [wpan?] WARNING in hwsim_hw_xmit 0 (1) 2026/09/14 09:57

Sample crash report:
------------[ cut here ]------------
current_phy->suspended
WARNING: drivers/net/ieee802154/mac802154_hwsim.c:266 at hwsim_hw_xmit+0xcbf/0x1540 drivers/net/ieee802154/mac802154_hwsim.c:266, CPU#1: syz.0.2770/12526
Modules linked in:
CPU: 1 UID: 0 PID: 12526 Comm: syz.0.2770 Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026
RIP: 0010:hwsim_hw_xmit+0xcbf/0x1540 drivers/net/ieee802154/mac802154_hwsim.c:266
Code: 48 c7 c2 40 3f c0 8c be 52 03 00 00 48 c7 c7 a0 3f c0 8c c6 05 0f 22 c6 09 01 e8 bc 1b 80 fa e9 c6 f8 ff ff e8 32 5a a5 fa 90 <0f> 0b 90 e9 11 f4 ff ff e8 24 5a a5 fa e8 5f 0a 89 fa 31 ff 89 c5
RSP: 0018:ffffc900067af530 EFLAGS: 00010287
RAX: 0000000000000309 RBX: ffff88802a592d20 RCX: ffffc9000e4e1000
RDX: 0000000000080000 RSI: ffffffff8766c51e RDI: ffff88807f1fa580
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8766b860
R13: 1ffff92000cf5eb0 R14: ffff88802a592720 R15: 0000000000000031
FS:  00007f904a6726c0(0000) GS:ffff888123c59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 00000000568f9000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 drv_xmit_async net/mac802154/driver-ops.h:16 [inline]
 ieee802154_tx.isra.0+0x29f/0x570 net/mac802154/tx.c:89
 ieee802154_subif_start_xmit+0xc8/0xf0 net/mac802154/tx.c:239
 __netdev_start_xmit include/linux/netdevice.h:5429 [inline]
 netdev_start_xmit include/linux/netdevice.h:5438 [inline]
 xmit_one net/core/dev.c:3937 [inline]
 dev_hard_start_xmit+0x121/0x760 net/core/dev.c:3953
 sch_direct_xmit+0x1b2/0xc70 net/sched/sch_generic.c:372
 __dev_xmit_skb net/core/dev.c:4262 [inline]
 __dev_queue_xmit+0x27ac/0x4970 net/core/dev.c:4884
 dev_queue_xmit include/linux/netdevice.h:3461 [inline]
 raw_sendmsg+0x5b6/0x880 net/ieee802154/socket.c:299
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:815 [inline]
 ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2713
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2767
 __sys_sendmsg+0x160/0x210 net/socket.c:2799
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f904979e159
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:00007f904a672028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f9049a25fa0 RCX: 00007f904979e159
RDX: 0000000024004014 RSI: 0000200000000080 RDI: 0000000000000005
RBP: 00007f904983506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9049a26038 R14: 00007f9049a25fa0 R15: 00007ffea21b7bd8
 </TASK>

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/16 14:52 upstream 9b87fdc9af2f 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in hwsim_hw_xmit
2026/09/14 03:18 upstream fd73f4a66598 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in hwsim_hw_xmit
2026/09/12 21:46 upstream 5225b8eec4c9 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in hwsim_hw_xmit
2026/09/10 09:53 upstream 50d05c7c76c9 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in hwsim_hw_xmit
2026/09/14 07:26 upstream 50d05c7c76c9 70a60e12 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in hwsim_hw_xmit
2026/09/16 03:26 net-next b8e9e7d82e7e 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in hwsim_hw_xmit
2026/09/15 04:35 net-next 0019aa65bbc6 924033e8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in hwsim_hw_xmit
2026/09/13 04:02 net-next 879e280b8486 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in hwsim_hw_xmit
2026/09/13 19:31 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5445d6419962 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in hwsim_hw_xmit
2026/09/13 12:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5445d6419962 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in hwsim_hw_xmit
* Struck through repros no longer work on HEAD.