syzbot

 sign-in | mailing list | source | docs | 🏰
🐞 Open [1328]
≡ Subsystems
🐞 Fixed [7156]
🐞 Invalid [18925]
⬇ Missing Backports [221]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
✨ AI
💬 Send us feedback

WARNING in mac80211_hwsim_tx (2)

Status: upstream: reported on 2026/05/10 21:02
Subsystems: wireless
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+435fdb053cf98bfa5778@syzkaller.appspotmail.com
First crash: 39d, last: 16d
▶ ▼ ✨ AI Jobs (3)
ID Workflow Result Correct Bug Created Started Finished Revision Error
3b151767-f899-408d-9229-31650328d21c assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in mac80211_hwsim_tx (2) 2026/05/31 05:08 2026/05/31 05:08 2026/05/31 06:07 6b4a844333e83556da95d61d7f207e7ef5cd4bc6
5d15ab96-dd2c-4a03-a93a-49ab041e8a19 repro-c Reproduced: ✅ ❓ WARNING in mac80211_hwsim_tx (2) 2026/05/25 10:25 2026/05/25 10:49 2026/05/25 14:06 c69befb30ac10e158cc9d1557b508ee3f0eca1de
a30b0016-95b2-40af-ba20-3b922f526d5c assessment-security 💥 WARNING in mac80211_hwsim_tx (2) 2026/05/14 14:11 2026/05/14 14:11 2026/05/14 14:12 6ccb967e465e832a7bfd7a116ad00d52a0923a5d failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128 From /app/workdir/repo/linux * branch HEAD -> FETCH_HEAD Updating files: 18% (17779/93692) Updating files: 19% (17802/93692) Updating files: 20% (18739/93692) Updating files: 21% (19676/93692) Updating files: 22% (20613/93692) Updating files: 23% (21550/93692) Updating files: 24% (22487/93692) Updating files: 25% (23423/93692) Updating files: 26% (24360/93692) Updating files: 27% (25297/93692) Updating files: 28% (26234/93692) Updating files: 29% (27171/93692) Updating files: 30% (28108/93692) Updating files: 30% (28947/93692) Updating files: 31% (29045/93692) error: unable to write file crypto/testmgr.h error: unable to write file crypto/twofish_common.c error: unable to write file crypto/twofish_generic.c error: unable to write file crypto/wp512.c error: unable to write file crypto/xcbc.c error: unable to write file crypto/xctr.c error: unable to write file crypto/xts.c error: unable to write file crypto/xxhash_generic.c error: unable to write file crypto/zstd.c fatal: cannot create directory at 'drivers': No space left on device
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [wireless?] WARNING in mac80211_hwsim_tx (2) 0 (1) 2026/05/10 21:02
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in mac80211_hwsim_tx -1 1 16d 16d 0/3 upstream: reported on 2026/05/29 17:05
upstream WARNING in mac80211_hwsim_tx wireless -1 44 442d 544d 0/29 auto-obsoleted due to no activity on 2025/06/07 07:17

Sample crash report:
------------[ cut here ]------------
hwsim_get_chanwidth(bw) > hwsim_get_chanwidth(confbw)
WARNING: drivers/net/wireless/virtual/mac80211_hwsim.c:2235 at mac80211_hwsim_tx+0x1b4b/0x2620 drivers/net/wireless/virtual/mac80211_hwsim.c:2235, CPU#1: syz.0.597/7851
Modules linked in:
CPU: 1 UID: 0 PID: 7851 Comm: syz.0.597 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:mac80211_hwsim_tx+0x1b4b/0x2620 drivers/net/wireless/virtual/mac80211_hwsim.c:2235
Code: c6 05 de aa 0d 09 01 48 c7 c7 80 4f 79 8c be 5e 08 00 00 48 c7 c2 c0 5e 79 8c e8 f0 7c 95 fa e9 e2 f9 ff ff e8 36 45 b9 fa 90 <0f> 0b 90 48 81 c4 b0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc
RSP: 0018:ffffc9000384f0f8 EFLAGS: 00010283
RAX: ffffffff870c729a RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90004af1000 RSI: 0000000000000228 RDI: 0000000000000229
RBP: ffff888074cfc170 R08: ffff888077eddd00 R09: 000000000000000e
R10: 000000000000000d R11: 0000000000000002 R12: 0000000000000014
R13: 0000000000000028 R14: 0000000000000501 R15: 0000000000000030
FS:  00007f59478ed6c0(0000) GS:ffff88812539e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34c14ff8 CR3: 000000007beec000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 drv_tx net/mac80211/driver-ops.h:38 [inline]
 ieee80211_tx_frags+0x3e7/0x8c0 net/mac80211/tx.c:1746
 __ieee80211_tx+0x23f/0x570 net/mac80211/tx.c:1801
 ieee80211_tx+0x312/0x4b0 net/mac80211/tx.c:1984
 ieee80211_monitor_start_xmit+0xb46/0x1250 net/mac80211/tx.c:2467
 __netdev_start_xmit include/linux/netdevice.h:5368 [inline]
 netdev_start_xmit include/linux/netdevice.h:5377 [inline]
 xmit_one net/core/dev.c:3888 [inline]
 dev_hard_start_xmit+0x2cd/0x830 net/core/dev.c:3904
 __dev_queue_xmit+0x14d9/0x3950 net/core/dev.c:4870
 packet_snd net/packet/af_packet.c:3082 [inline]
 packet_sendmsg+0x3c81/0x4fb0 net/packet/af_packet.c:3114
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 __sys_sendto+0x672/0x710 net/socket.c:2265
 __do_sys_sendto net/socket.c:2272 [inline]
 __se_sys_sendto net/socket.c:2268 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2268
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f594699ce59
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:00007f59478ed028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f5946c15fa0 RCX: 00007f594699ce59
RDX: 0000000000000030 RSI: 0000200000000640 RDI: 0000000000000007
RBP: 00007f5946a32d6f R08: 0000200000000380 R09: 0000000000000014
R10: 0000000004000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5946c16038 R14: 00007f5946c15fa0 R15: 00007f5946d3fa48
 </TASK>

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/29 14:06 upstream 8fde5d1d47f6 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mac80211_hwsim_tx
2026/05/29 14:06 upstream 8fde5d1d47f6 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in mac80211_hwsim_tx
2026/05/06 20:58 upstream adc1e5c6203c cbcd9ea0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in mac80211_hwsim_tx
2026/05/29 16:21 upstream 8fde5d1d47f6 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in mac80211_hwsim_tx
2026/05/29 12:23 upstream 8fde5d1d47f6 6b4a8443 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in mac80211_hwsim_tx
2026/05/29 12:18 upstream 8fde5d1d47f6 6b4a8443 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in mac80211_hwsim_tx
2026/05/29 12:41 upstream 8fde5d1d47f6 6b4a8443 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in mac80211_hwsim_tx
2026/05/29 12:41 upstream 8fde5d1d47f6 6b4a8443 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in mac80211_hwsim_tx
2026/05/29 12:41 upstream 8fde5d1d47f6 6b4a8443 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in mac80211_hwsim_tx
2026/05/29 13:31 net 422b5233b607 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in mac80211_hwsim_tx
2026/05/29 13:24 net 422b5233b607 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in mac80211_hwsim_tx
2026/05/29 14:29 net-next 841559836550 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in mac80211_hwsim_tx
2026/05/29 14:29 net-next 841559836550 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in mac80211_hwsim_tx
2026/05/29 13:10 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 4b4362973b6f 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in mac80211_hwsim_tx
2026/05/29 13:10 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 4b4362973b6f 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in mac80211_hwsim_tx
* Struck through repros no longer work on HEAD.