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: 258d, last: 22h59m
▶ ▼ 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 1267d 2137d 22/29 fixed on 2023/02/24 13:50
linux-5.15 WARNING in ieee80211_ibss_csa_beacon (3) -1 18 59d 385d 0/3 upstream: reported on 2025/07/26 04:50
linux-6.6 WARNING in ieee80211_ibss_csa_beacon -1 1 415d 415d 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 32 11d 270d 0/3 upstream: reported on 2025/11/18 07:37
linux-4.19 WARNING in ieee80211_ibss_csa_beacon -1 syz, C error 1037 1257d 2092d 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 1273d 2105d 0/1 upstream: reported C repro on 2020/11/08 18:28
linux-5.15 WARNING in ieee80211_ibss_csa_beacon -1 504 644d 1255d 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 484d 569d 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 929d 1263d 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 370d 1256d 0/3 auto-obsoleted due to no activity on 2025/10/18 20:45

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6996 at net/mac80211/ibss.c:501 ieee80211_ibss_csa_beacon+0x5c8/0x690 net/mac80211/ibss.c:501
Modules linked in:
CPU: 0 PID: 6996 Comm: kworker/u4:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:ieee80211_ibss_csa_beacon+0x5c8/0x690 net/mac80211/ibss.c:501
Code: f7 c6 05 a9 55 74 04 01 48 c7 c7 80 bb df 8b be fe 01 00 00 48 c7 c2 20 bc df 8b e8 22 9b 66 f7 e9 46 fe ff ff e8 48 d2 84 f7 <0f> 0b b8 ea ff ff ff e9 7a ff ff ff e8 37 d2 84 f7 0f 0b e9 a7 fa
RSP: 0018:ffffc9000326f2f0 EFLAGS: 00010283
RAX: ffffffff8a029fd8 RBX: ffff88807b388700 RCX: 0000000000100000
RDX: ffffc90017ab2000 RSI: 00000000000006b2 RDI: 00000000000006b3
RBP: 1ffff1100e891ac3 R08: ffffffff911ed5c7 R09: 1ffffffff223dab8
R10: dffffc0000000000 R11: fffffbfff223dab9 R12: 0000000000000000
R13: ffffc9000326f4c0 R14: ffff88807448db08 R15: ffff88807448cd00
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31415ff8 CR3: 000000005ef08000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 ieee80211_set_csa_beacon+0x772/0xa00 net/mac80211/cfg.c:3826
 __ieee80211_channel_switch net/mac80211/cfg.c:3954 [inline]
 ieee80211_channel_switch+0x7e9/0xe80 net/mac80211/cfg.c:3999
 ieee80211_ibss_process_chanswitch+0x954/0xcf0 net/mac80211/ibss.c:892
 ieee80211_rx_mgmt_spectrum_mgmt net/mac80211/ibss.c:931 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x1087/0x2dc0 net/mac80211/ibss.c:1666
 ieee80211_iface_process_skb net/mac80211/iface.c:1661 [inline]
 ieee80211_iface_work+0x730/0xc90 net/mac80211/iface.c:1715
 cfg80211_wiphy_work+0x228/0x260 net/wireless/core.c:437
 process_one_work kernel/workqueue.c:2657 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
 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 (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/14 09:30 linux-6.6.y d27334b2888c b13552fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in ieee80211_ibss_csa_beacon
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.