WARNING in hwsim_hw_xmit

Status: upstream: reported C repro on 2026/09/14 09:57
Subsystems: wpan
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+adb0bf16414b8bb2d799@syzkaller.appspotmail.com
First crash: 29d, last: 8h47m
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
824cb12e repro-c Reproduced: ✅ ❓ WARNING in hwsim_hw_xmit 2026/09/17 17:05 2026/09/17 17:06 2026/09/17 18:50 8d7d05f1
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 (2)
Title Replies (including bot) Last reply
[PATCH] mac802154: synchronize pending transmissions before stopping the hardware 2 (2) 2026/09/25 09:03
[syzbot] [wpan?] WARNING in hwsim_hw_xmit 0 (2) 2026/09/17 19:05
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/09/17 18:50 14m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4982d3552a3bf94de503acf93433277d08421de6 report job log log

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#0: syz-executor682/6038
Modules linked in:
CPU: 0 UID: 0 PID: 6038 Comm: syz-executor682 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
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 8f 23 c6 09 01 e8 7c 1b 80 fa e9 c6 f8 ff ff e8 52 5a a5 fa 90 <0f> 0b 90 e9 11 f4 ff ff e8 44 5a a5 fa e8 1f 0a 89 fa 31 ff 89 c5
RSP: 0018:ffffc90003a0f650 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802a808d20 RCX: 0000000000000202
RDX: ffff8880295e8000 RSI: ffffffff8766c55e RDI: ffff8880295e8000
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8766b8a0
R13: 1ffff92000741ed4 R14: ffff88802a808720 R15: 0000000000000053
FS:  00007f554300f6c0(0000) GS:ffff8880d5b59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f554300eff8 CR3: 0000000022b9e000 CR4: 0000000000352ef0
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
 qdisc_restart net/sched/sch_generic.c:437 [inline]
 __qdisc_run+0x52d/0x1b20 net/sched/sch_generic.c:445
 qdisc_run include/net/pkt_sched.h:121 [inline]
 qdisc_run include/net/pkt_sched.h:118 [inline]
 __dev_xmit_skb net/core/dev.c:4272 [inline]
 __dev_queue_xmit+0x18b9/0x4970 net/core/dev.c:4884
 dev_queue_xmit include/linux/netdevice.h:3461 [inline]
 dgram_sendmsg+0xa0d/0xf50 net/ieee802154/socket.c:689
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:815 [inline]
 __sys_sendto+0x48b/0x4e0 net/socket.c:2281
 __do_sys_sendto net/socket.c:2288 [inline]
 __se_sys_sendto net/socket.c:2284 [inline]
 __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2284
 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: 0033:0x7f554306749e
Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08
RSP: 002b:00007f554300f168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f554300f6c0 RCX: 00007f554306749e
RDX: 0000000000000040 RSI: 00007f554300f1d0 RDI: 0000000000000004
RBP: 0000000000000021 R08: 00007f55430e5b10 R09: 0000000000000014
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffd0
R13: 000000000000000b R14: 00007ffdf0e50d30 R15: 00007ffdf0e50e18
 </TASK>

Crashes (38):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/17 19:04 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4982d3552a3b 95928915 .config console log report C ci-qemu-upstream WARNING in hwsim_hw_xmit
2026/10/08 21:35 upstream 7b63ef2d55f2 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in hwsim_hw_xmit
2026/10/06 21:30 upstream 69f80fef3153 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in hwsim_hw_xmit
2026/10/05 11:45 upstream a90ee4305c4a 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in hwsim_hw_xmit
2026/10/04 10:17 upstream a74306e2e676 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in hwsim_hw_xmit
2026/09/30 20:29 upstream 551c722f4080 892a21ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in hwsim_hw_xmit
2026/09/22 21:55 upstream c4e9f74da438 3e2106e5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in hwsim_hw_xmit
2026/09/19 08:20 upstream 40288c9206c1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in hwsim_hw_xmit
2026/09/19 05:23 upstream c3d85c669d09 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in hwsim_hw_xmit
2026/09/17 16:13 upstream 238650ef6c7c 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in hwsim_hw_xmit
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
2026/10/09 09:10 upstream 6c377d19d4a5 b2734a59 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in hwsim_hw_xmit
2026/09/26 19:03 upstream 6812ce4e4379 a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in hwsim_hw_xmit
2026/09/26 07:37 upstream f14572c203d5 a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in hwsim_hw_xmit
2026/09/22 08:31 upstream f0100363d8c3 e12281bd .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in hwsim_hw_xmit
2026/09/19 04:04 upstream 40288c9206c1 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream 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
2026/09/20 13:02 net c82b797abe66 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in hwsim_hw_xmit
2026/09/18 02:14 net 3b95a04eb5f9 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in hwsim_hw_xmit
2026/10/07 22:15 net-next 45ad84d2800e 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in hwsim_hw_xmit
2026/09/24 13:59 net-next a9e94a7faa56 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce 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
2026/10/06 06:43 linux-next bf1ee2bd5c2d f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in hwsim_hw_xmit
2026/10/04 07:21 linux-next f0406245cb98 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in hwsim_hw_xmit
2026/10/01 21:21 linux-next 9f24d789f03b 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in hwsim_hw_xmit
2026/10/01 20:55 linux-next 9f24d789f03b 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in hwsim_hw_xmit
2026/09/28 16:51 linux-next 6375e61c01e9 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in hwsim_hw_xmit
2026/09/28 05:11 linux-next f5f84daefcd9 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in hwsim_hw_xmit
2026/09/28 01:58 linux-next f5f84daefcd9 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in hwsim_hw_xmit
2026/09/27 22:55 linux-next f5f84daefcd9 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in hwsim_hw_xmit
2026/09/25 06:40 linux-next 4c253ac4b29b f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root 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.