WARNING in ieee80211_ibss_csa_beacon (2)

Status: upstream: reported on 2025/11/29 13:51
Reported-by: syzbot+7627b649116aa7c9bd3a@syzkaller.appspotmail.com
First crash: 243d, last: 49d
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in ieee80211_ibss_csa_beacon wireless -1 syz, C error 4997 1252d 2121d 22/29 fixed on 2023/02/24 13:50
linux-5.15 WARNING in ieee80211_ibss_csa_beacon (3) -1 18 43d 369d 0/3 upstream: reported on 2025/07/26 04:50
linux-6.6 WARNING in ieee80211_ibss_csa_beacon -1 1 400d 400d 0/2 auto-obsoleted due to no activity on 2025/10/03 10:51
linux-6.1 WARNING in ieee80211_ibss_csa_beacon (2) -1 31 1d19h 254d 0/3 upstream: reported on 2025/11/18 07:37
linux-4.19 WARNING in ieee80211_ibss_csa_beacon -1 syz, C error 1037 1241d 2076d 0/1 upstream: reported C repro on 2020/11/22 05:50
linux-4.14 WARNING in ieee80211_ibss_csa_beacon -1 syz, C 1 1258d 2089d 0/1 upstream: reported C repro on 2020/11/08 18:28
linux-5.15 WARNING in ieee80211_ibss_csa_beacon -1 504 628d 1239d 0/3 auto-obsoleted due to no activity on 2025/01/17 15:26
linux-5.15 WARNING in ieee80211_ibss_csa_beacon (2) -1 15 469d 553d 0/3 auto-obsoleted due to no activity on 2025/07/10 03:17
upstream WARNING in ieee80211_ibss_csa_beacon (2) wireless -1 2892 914d 1247d 0/29 auto-obsoleted due to no activity on 2024/04/07 10:40
linux-6.1 WARNING in ieee80211_ibss_csa_beacon -1 318 354d 1240d 0/3 auto-obsoleted due to no activity on 2025/10/18 20:45

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5848 at net/mac80211/ibss.c:501 ieee80211_ibss_csa_beacon+0x5bd/0x6a0 net/mac80211/ibss.c:501
Modules linked in:
CPU: 0 PID: 5848 Comm: kworker/u4:9 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:ieee80211_ibss_csa_beacon+0x5bd/0x6a0 net/mac80211/ibss.c:501
Code: f7 c6 05 67 3b 7a 04 01 48 c7 c7 00 18 df 8b be fe 01 00 00 48 c7 c2 a0 18 df 8b e8 3d 1e 6d f7 e9 5f fe ff ff e8 f3 64 8b f7 <0f> 0b b8 ea ff ff ff e9 7a ff ff ff e8 e2 64 8b f7 0f 0b e9 b2 fa
RSP: 0018:ffffc90004a8f2e0 EFLAGS: 00010283
RAX: ffffffff89fbc69d RBX: ffff8880590c8700 RCX: 0000000000100000
RDX: ffffc90016ee9000 RSI: 00000000000010fc RDI: 00000000000010fd
RBP: 1ffff1100f9a6ac3 R08: ffffffff911cd5c7 R09: 1ffffffff2239ab8
R10: dffffc0000000000 R11: fffffbfff2239ab9 R12: ffffc90004a8f4c0
R13: ffff88807cd35618 R14: ffff88807cd35b08 R15: ffff88807cd34d00
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000005f030 CR3: 0000000066375000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 ieee80211_set_csa_beacon+0x77e/0xa10 net/mac80211/cfg.c:3826
 __ieee80211_channel_switch net/mac80211/cfg.c:3954 [inline]
 ieee80211_channel_switch+0x7e9/0xe70 net/mac80211/cfg.c:3999
 ieee80211_ibss_process_chanswitch+0x9d6/0xd70 net/mac80211/ibss.c:892
 ieee80211_rx_mgmt_spectrum_mgmt net/mac80211/ibss.c:931 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x1045/0x2c80 net/mac80211/ibss.c:1666
 ieee80211_iface_process_skb net/mac80211/iface.c:1655 [inline]
 ieee80211_iface_work+0x717/0xc70 net/mac80211/iface.c:1709
 cfg80211_wiphy_work+0x225/0x260 net/wireless/core.c:437
 process_one_work kernel/workqueue.c:2653 [inline]
 process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/10 19:53 linux-6.6.y 924b4a879cbb f79bac11 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_ibss_csa_beacon
2026/05/11 10:32 linux-6.6.y 3b9f64db0496 845acb1c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_ibss_csa_beacon
2026/05/08 16:31 linux-6.6.y 3b9f64db0496 b2988c17 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_ibss_csa_beacon
2026/05/04 19:32 linux-6.6.y 258cf62a6dfd 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_ibss_csa_beacon
2026/02/10 07:22 linux-6.6.y c56aaf1a85ae 4ab09a02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_ibss_csa_beacon
2025/11/29 13:50 linux-6.6.y 1e89a1be4fe9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_ibss_csa_beacon
* Struck through repros no longer work on HEAD.