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: 1263d, last: 3h53m
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 2373d 2392d 0/29 auto-closed as invalid on 2020/07/02 02:22
linux-6.6 WARNING in __cfg80211_ibss_joined -1 syz 181 1d10h 440d 0/2 upstream: reported syz repro on 2025/06/19 03:38
linux-4.14 WARNING in __cfg80211_ibss_joined -1 syz, C 12 1290d 2168d 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 syz, C 313 2d15h 1273d 0/3 upstream: reported C repro on 2023/03/08 19:50
upstream WARNING in __cfg80211_ibss_joined (2) prio:high wireless -1 syz, C error 6988 2d13h 2168d 0/29 upstream: reported C repro on 2020/09/24 09:26
linux-4.19 WARNING in __cfg80211_ibss_joined -1 syz, C 236 1283d 2130d 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 (417):
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
2026/09/02 02:58 linux-6.1.y d64a499eea6b 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/09/01 13:02 linux-6.1.y d64a499eea6b 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/31 05:20 linux-6.1.y d64a499eea6b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/28 13:03 linux-6.1.y d64a499eea6b e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/27 18:59 linux-6.1.y 79a9660d699e 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/27 15:38 linux-6.1.y 79a9660d699e 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/25 22:55 linux-6.1.y 05208478041c a9a1fc32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/25 08:41 linux-6.1.y 05208478041c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/25 04:40 linux-6.1.y 05208478041c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/25 03:25 linux-6.1.y 05208478041c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/24 21:47 linux-6.1.y 05208478041c b55bd4c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __cfg80211_ibss_joined
2026/08/24 03:27 linux-6.1.y 05208478041c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/22 01:31 linux-6.1.y 7e6e67054721 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/21 07:18 linux-6.1.y 7e6e67054721 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/19 23:54 linux-6.1.y 7e6e67054721 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/19 22:03 linux-6.1.y 7e6e67054721 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/14 14:53 linux-6.1.y e4f7d8be268e 6f9b3e89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/08 05:49 linux-6.1.y e4f7d8be268e 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/07 05:33 linux-6.1.y 03f3a99e8e93 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/05 15:31 linux-6.1.y fb28aa725e05 52aa2820 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/05 13:26 linux-6.1.y fb28aa725e05 52aa2820 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/04 22:51 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/04 04:32 linux-6.1.y fb28aa725e05 9451e17e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/03 08:24 linux-6.1.y fb28aa725e05 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/01 12:59 linux-6.1.y fb28aa725e05 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/31 04:18 linux-6.1.y fb28aa725e05 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/31 03:18 linux-6.1.y fb28aa725e05 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/29 23:34 linux-6.1.y 1016ca6176ee 6ef5c1e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/28 17:26 linux-6.1.y dc5c83b7f5f8 edc8a875 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/28 10:38 linux-6.1.y dc5c83b7f5f8 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/27 13:23 linux-6.1.y dc5c83b7f5f8 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/26 16:47 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/26 00:33 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/25 19:54 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/24 20:47 linux-6.1.y dc5c83b7f5f8 dd737a83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/24 14:03 linux-6.1.y 090666d3cc90 dd737a83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/23 11:48 linux-6.1.y 090666d3cc90 881ce5c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/23 07:56 linux-6.1.y 090666d3cc90 881ce5c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/22 15:04 linux-6.1.y 090666d3cc90 4a865b71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/22 12:23 linux-6.1.y 090666d3cc90 4a865b71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/22 07:46 linux-6.1.y 090666d3cc90 b561ce9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/21 17:19 linux-6.1.y 090666d3cc90 7c5de9c3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/07/20 13:50 linux-6.1.y 090666d3cc90 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __cfg80211_ibss_joined
2026/08/31 17:59 linux-6.1.y d64a499eea6b 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __cfg80211_ibss_joined
2026/08/29 14:36 linux-6.1.y d64a499eea6b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __cfg80211_ibss_joined
2026/08/27 06:08 linux-6.1.y 05208478041c a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __cfg80211_ibss_joined
2026/08/14 20:26 linux-6.1.y e4f7d8be268e 6f9b3e89 .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.