syzbot


WARNING in ieee80211_ibss_csa_beacon (3)

Status: upstream: reported on 2025/07/26 04:50
Reported-by: syzbot+a39e6103721cc1109d3d@syzkaller.appspotmail.com
First crash: 48d, last: 36d
Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in ieee80211_ibss_csa_beacon wireless -1 C error 4997 931d 1800d 22/29 fixed on 2023/02/24 13:50
linux-6.6 WARNING in ieee80211_ibss_csa_beacon -1 1 79d 79d 0/2 upstream: reported on 2025/06/25 10:51
linux-4.19 WARNING in ieee80211_ibss_csa_beacon -1 C error 1037 920d 1755d 0/1 upstream: reported C repro on 2020/11/22 05:50
linux-4.14 WARNING in ieee80211_ibss_csa_beacon -1 C 1 937d 1768d 0/1 upstream: reported C repro on 2020/11/08 18:28
linux-5.15 WARNING in ieee80211_ibss_csa_beacon -1 504 308d 918d 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 148d 232d 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 593d 927d 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 33d 919d 0/3 upstream: reported on 2023/03/08 04:59

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4414 at net/mac80211/ibss.c:503 ieee80211_ibss_csa_beacon+0x544/0x620 net/mac80211/ibss.c:503
Modules linked in:
CPU: 0 PID: 4414 Comm: kworker/u4:9 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: phy17 ieee80211_iface_work
RIP: 0010:ieee80211_ibss_csa_beacon+0x544/0x620 net/mac80211/ibss.c:503
Code: f8 c6 05 08 7e 22 04 01 48 c7 c7 50 94 18 8b be 01 02 00 00 48 c7 c2 e0 94 18 8b e8 76 3d 6a 00 e9 62 fe ff ff e8 fc 7b 44 f8 <0f> 0b b8 ea ff ff ff e9 7a ff ff ff e8 eb 7b 44 f8 0f 0b e9 23 fb
RSP: 0018:ffffc9000346f4d0 EFLAGS: 00010287

RAX: ffffffff89334824 RBX: ffff88805d815b08 RCX: 0000000000100000
RDX: ffffc900136f7000 RSI: 000000000000062c RDI: 000000000000062d
RBP: dffffc0000000000 R08: dffffc0000000000 R09: fffffbfff1ff6e32
R10: fffffbfff1ff6e32 R11: 1ffffffff1ff6e31 R12: ffff88805d815288
R13: ffff88807d1705c0 R14: ffff88805d814c80 R15: 1ffff1100bb02a51
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd78cf1e68 CR3: 00000000596cf000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ieee80211_set_csa_beacon+0x6b0/0x9c0 net/mac80211/cfg.c:3382
 __ieee80211_channel_switch net/mac80211/cfg.c:3512 [inline]
 ieee80211_channel_switch+0x7b3/0xca0 net/mac80211/cfg.c:3550
 ieee80211_ibss_process_chanswitch+0x8db/0xb20 net/mac80211/ibss.c:892
 ieee80211_rx_mgmt_spectrum_mgmt net/mac80211/ibss.c:931 [inline]
 ieee80211_ibss_rx_queued_mgmt+0xeb7/0x29c0 net/mac80211/ibss.c:1667
 ieee80211_iface_process_skb net/mac80211/iface.c:1459 [inline]
 ieee80211_iface_work+0x70e/0xc60 net/mac80211/iface.c:1513
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/07 16:06 linux-5.15.y c79648372d02 04cffc22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in ieee80211_ibss_csa_beacon
2025/07/26 04:49 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in ieee80211_ibss_csa_beacon
* Struck through repros no longer work on HEAD.