syzbot


WARNING in ieee80211_set_active_links (3)

Status: upstream: reported on 2026/02/26 03:22
Subsystems: wireless
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+582469b3a9ef5f13606b@syzkaller.appspotmail.com
First crash: 97d, last: 15d
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
f85d9976-e907-4ca0-883c-39780455079d assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in ieee80211_set_active_links (3) 2026/05/25 15:35 2026/05/25 15:35 2026/05/25 16:22 c69befb30ac10e158cc9d1557b508ee3f0eca1de
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [wireless?] WARNING in ieee80211_set_active_links (3) 0 (1) 2026/02/26 03:22
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in ieee80211_set_active_links wireless -1 C 2 498d 516d 28/29 fixed on 2025/05/06 15:33
upstream WARNING in ieee80211_set_active_links (2) wireless -1 1 278d 274d 0/29 auto-obsoleted due to no activity on 2025/12/03 02:32

Sample crash report:
------------[ cut here ]------------
wlan0: Failed check-sdata-in-driver check, flags: 0x0
WARNING: net/mac80211/driver-ops.h:1723 at drv_can_activate_links net/mac80211/driver-ops.h:1723 [inline], CPU#0: kworker/u12:16/26434
WARNING: net/mac80211/driver-ops.h:1723 at ieee80211_set_active_links+0x2d0/0x9a0 net/mac80211/link.c:614, CPU#0: kworker/u12:16/26434
Modules linked in:
CPU: 0 UID: 0 PID: 26434 Comm: kworker/u12:16 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:drv_can_activate_links net/mac80211/driver-ops.h:1723 [inline]
RIP: 0010:ieee80211_set_active_links+0x2d7/0x9a0 net/mac80211/link.c:614
Code: 05 00 00 e8 ab 5e 09 f7 48 8b 34 24 48 81 c6 20 01 00 00 48 89 34 24 e8 97 5e 09 f7 48 8d 3d e0 33 ea 05 48 8b 34 24 44 89 fa <67> 48 0f b9 3a e9 e0 fe ff ff e8 7a 5e 09 f7 0f b7 c5 4c 8d bb c8
RSP: 0018:ffffc90005317ae8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888145e82b78 RCX: ffffffff8afeabce
RDX: 0000000000000000 RSI: ffff888145e80120 RDI: ffffffff90e8e010
RBP: 000000000000000f R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888145e81878
R13: 0000000000000000 R14: ffff888145ef0f20 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124377000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000012966000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ieee80211_if_parse_active_links+0xbb/0x120 net/mac80211/debugfs_netdev.c:732
 wiphy_locked_debugfs_write_work+0xe6/0x1c0 net/wireless/debugfs.c:248
 cfg80211_wiphy_work+0x410/0x570 net/wireless/core.c:513
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	05 00 00 e8 ab       	add    $0xabe80000,%eax
   5:	5e                   	pop    %rsi
   6:	09 f7                	or     %esi,%edi
   8:	48 8b 34 24          	mov    (%rsp),%rsi
   c:	48 81 c6 20 01 00 00 	add    $0x120,%rsi
  13:	48 89 34 24          	mov    %rsi,(%rsp)
  17:	e8 97 5e 09 f7       	call   0xf7095eb3
  1c:	48 8d 3d e0 33 ea 05 	lea    0x5ea33e0(%rip),%rdi        # 0x5ea3403
  23:	48 8b 34 24          	mov    (%rsp),%rsi
  27:	44 89 fa             	mov    %r15d,%edx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 e0 fe ff ff       	jmp    0xffffff14
  34:	e8 7a 5e 09 f7       	call   0xf7095eb3
  39:	0f b7 c5             	movzwl %bp,%eax
  3c:	4c                   	rex.WR
  3d:	8d                   	.byte 0x8d
  3e:	bb                   	.byte 0xbb
  3f:	c8                   	.byte 0xc8

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/15 06:02 upstream 66182ca873a4 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in ieee80211_set_active_links
2026/05/04 13:47 upstream 6d35786de281 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in ieee80211_set_active_links
2026/05/04 13:47 upstream 6d35786de281 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in ieee80211_set_active_links
2026/04/11 14:23 upstream e774d5f1bc27 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in ieee80211_set_active_links
2026/04/03 18:41 upstream d8a9a4b11a13 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in ieee80211_set_active_links
2026/04/02 07:47 upstream 9147566d8016 0cb124d5 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in ieee80211_set_active_links
2026/04/01 15:35 upstream 9147566d8016 9a1f7828 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in ieee80211_set_active_links
2026/03/15 15:36 upstream 267594792a71 ee8d34d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in ieee80211_set_active_links
2026/03/12 19:08 upstream 80234b5ab240 4efadf07 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in ieee80211_set_active_links
2026/02/25 02:50 upstream 7dff99b35460 787dfb7c .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in ieee80211_set_active_links
2026/02/22 03:18 upstream d79526b89571 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in ieee80211_set_active_links
* Struck through repros no longer work on HEAD.