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WARNING in __cfg80211_ibss_joined

Status: upstream: reported C repro on 2023/03/18 13:26
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+06ac196aa9b02158d28c@syzkaller.appspotmail.com
First crash: 1218d, last: 13h51m
Fix bisection: the issue occurs on the latest tested release (bisect log)
Crash: WARNING in __cfg80211_ibss_joined (log)
Repro: C syz .config
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2024/05/03 linux-6.1.y (ToT) 909ba1f1b414 C [report] INFO: rcu detected stall in corrupted
2023/05/08 upstream (ToT) ac9a78681b92 C [report] WARNING in __cfg80211_ibss_joined
2024/05/03 upstream (ToT) 3d25a941ea50 C Didn't crash
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __cfg80211_ibss_joined wireless -1 8 2327d 2347d 0/29 auto-closed as invalid on 2020/07/02 02:22
linux-6.6 WARNING in __cfg80211_ibss_joined -1 syz 148 1h52m 394d 0/2 upstream: reported syz repro on 2025/06/19 03:38
linux-4.14 WARNING in __cfg80211_ibss_joined -1 C 12 1245d 2123d 0/1 upstream: reported C repro on 2020/09/24 13:20
linux-5.15 WARNING in __cfg80211_ibss_joined missing-backport origin:upstream -1 C 249 11h43m 1227d 0/3 upstream: reported C repro on 2023/03/08 19:50
upstream WARNING in __cfg80211_ibss_joined (2) prio:high wireless -1 C error 6966 7d20h 2123d 0/29 upstream: reported C repro on 2020/09/24 09:26
linux-4.19 WARNING in __cfg80211_ibss_joined -1 C 236 1237d 2085d 0/1 upstream: reported C repro on 2020/11/01 17:19
▶ ▼ Fix bisection attempts (5)
Created Duration User Patch Repo Result
2024/08/22 12:58 9h48m fix candidate upstream OK (2) job log
2024/03/25 00:27 1h16m bisect fix linux-6.1.y OK (0) job log log
2024/01/09 13:20 1h30m bisect fix linux-6.1.y OK (0) job log log
2023/12/10 11:48 1h31m bisect fix linux-6.1.y OK (0) job log log
2023/06/28 02:53 1h04m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 41 at net/wireless/ibss.c:37 __cfg80211_ibss_joined+0x428/0x4b0 net/wireless/ibss.c:37
Modules linked in:
CPU: 0 PID: 41 Comm: kworker/u4:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: cfg80211 cfg80211_event_work
RIP: 0010:__cfg80211_ibss_joined+0x428/0x4b0 net/wireless/ibss.c:37
Code: 00 00 00 48 3b 84 24 80 00 00 00 75 57 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 61 f2 ee f7 0f 0b eb bb e8 58 f2 ee f7 <0f> 0b eb b2 e8 4f f2 ee f7 0f 0b e9 77 fd ff ff e8 43 f2 ee f7 0f
RSP: 0018:ffffc90000b27aa0 EFLAGS: 00010293
RAX: ffffffff89938018 RBX: dffffc0000000000 RCX: ffff88801b6a9dc0
RDX: 0000000000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0c20
RBP: ffffc90000b27b70 R08: ffffffff90af32a7 R09: 1ffffffff215e654
R10: dffffc0000000000 R11: fffffbfff215e655 R12: ffff88807ae735d8
R13: 1ffff92000164f5c R14: 0000000000000006 R15: ffff888078ce0c90
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 000000000c88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 cfg80211_process_wdev_events+0x3ad/0x550 net/wireless/util.c:1109
 cfg80211_process_rdev_events+0x9d/0x110 net/wireless/util.c:1137
 cfg80211_event_work+0x2b/0x40 net/wireless/core.c:330
 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (341):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/01 20:59 linux-6.1.y cd9b81672742 6b8752f2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2024/02/23 22:39 linux-6.1.y 81e1dc2f7001 8d446f15 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2023/05/07 19:24 linux-6.1.y ca48fc16c493 90c93c40 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2023/04/01 05:46 linux-6.1.y 3b29299e5f60 f325deb0 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __cfg80211_ibss_joined
2023/05/28 10:57 linux-6.1.y a343b0dd87b4 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2023/05/28 07:07 linux-6.1.y a343b0dd87b4 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2023/05/08 07:34 linux-6.1.y ca48fc16c493 90c93c40 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2023/04/01 02:06 linux-6.1.y 3b29299e5f60 f325deb0 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __cfg80211_ibss_joined
2023/03/19 15:48 linux-6.1.y 7eaef76fbc46 7939252e .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __cfg80211_ibss_joined
2023/03/18 13:25 linux-6.1.y 7eaef76fbc46 7939252e .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __cfg80211_ibss_joined
2023/09/16 10:10 linux-6.1.y 09045dae0d90 0b6a67ac .config console log report syz [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/07/18 04:58 linux-6.1.y 090666d3cc90 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/16 01:34 linux-6.1.y 090666d3cc90 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/12 09:23 linux-6.1.y 090666d3cc90 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/07/12 02:53 linux-6.1.y 090666d3cc90 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/11 00:28 linux-6.1.y 090666d3cc90 99e64375 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/09 18:35 linux-6.1.y 090666d3cc90 a0c310a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/08 14:21 linux-6.1.y 090666d3cc90 88a4b44c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/08 02:17 linux-6.1.y 090666d3cc90 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/07/08 00:17 linux-6.1.y 090666d3cc90 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/07 19:12 linux-6.1.y 090666d3cc90 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/07 17:53 linux-6.1.y 090666d3cc90 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/07/07 17:42 linux-6.1.y 090666d3cc90 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/07/04 11:22 linux-6.1.y fdb6fcb41cc7 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/04 02:06 linux-6.1.y fdb6fcb41cc7 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/03 15:05 linux-6.1.y fdb6fcb41cc7 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/03 02:28 linux-6.1.y fdb6fcb41cc7 2b70b115 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/01 20:24 linux-6.1.y fdb6fcb41cc7 27192279 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/01 11:32 linux-6.1.y fdb6fcb41cc7 00a5cf1c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/30 19:46 linux-6.1.y fdb6fcb41cc7 00e8b0fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/30 08:04 linux-6.1.y fdb6fcb41cc7 fff8d0a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/06/30 06:27 linux-6.1.y fdb6fcb41cc7 fff8d0a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/06/29 22:54 linux-6.1.y fdb6fcb41cc7 6a0c72dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/06/29 22:54 linux-6.1.y fdb6fcb41cc7 6a0c72dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/06/29 18:26 linux-6.1.y fdb6fcb41cc7 6a0c72dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/06/27 23:33 linux-6.1.y fdb6fcb41cc7 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/06/26 21:29 linux-6.1.y fdb6fcb41cc7 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/26 11:24 linux-6.1.y fdb6fcb41cc7 7ff32d8b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/26 09:25 linux-6.1.y fdb6fcb41cc7 7ff32d8b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/06/25 17:50 linux-6.1.y fdb6fcb41cc7 cfa969bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/06/24 18:13 linux-6.1.y fdb6fcb41cc7 302586aa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/24 09:30 linux-6.1.y fdb6fcb41cc7 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/22 19:18 linux-6.1.y fdb6fcb41cc7 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/17 19:45 linux-6.1.y 228da13e907e b62b3ded .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/17 17:16 linux-6.1.y 228da13e907e b62b3ded .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/16 12:04 linux-6.1.y 228da13e907e a3998659 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/12 14:00 linux-6.1.y 228da13e907e e93da63e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/12 06:55 linux-6.1.y 228da13e907e e93da63e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/10 10:26 linux-6.1.y 228da13e907e 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/08 21:27 linux-6.1.y 228da13e907e 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/08 15:31 linux-6.1.y 228da13e907e 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/04 23:49 linux-6.1.y 228da13e907e 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/04 17:29 linux-6.1.y 228da13e907e 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/06/30 09:46 linux-6.1.y fdb6fcb41cc7 fff8d0a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __cfg80211_ibss_joined
2026/06/29 00:05 linux-6.1.y fdb6fcb41cc7 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __cfg80211_ibss_joined
* Struck through repros no longer work on HEAD.