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: 1d15h, last: 1d15h
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 884d 1753d 22/29 fixed on 2023/02/24 13:50
linux-6.6 WARNING in ieee80211_ibss_csa_beacon -1 1 32d 32d 0/2 upstream: reported on 2025/06/25 10:51
linux-4.19 WARNING in ieee80211_ibss_csa_beacon -1 C error 1037 873d 1708d 0/1 upstream: reported C repro on 2020/11/22 05:50
linux-4.14 WARNING in ieee80211_ibss_csa_beacon -1 C 1 890d 1722d 0/1 upstream: reported C repro on 2020/11/08 18:28
linux-5.15 WARNING in ieee80211_ibss_csa_beacon -1 504 261d 871d 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 101d 185d 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 546d 880d 0/29 auto-obsoleted due to no activity on 2024/04/07 10:40
linux-6.1 WARNING in ieee80211_ibss_csa_beacon -1 316 49d 872d 0/3 upstream: reported on 2023/03/08 04:59

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8285 at net/mac80211/ibss.c:503 ieee80211_ibss_csa_beacon+0x4e4/0x590 net/mac80211/ibss.c:503
Modules linked in:
CPU: 1 PID: 8285 Comm: kworker/u4:11 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: phy4 ieee80211_csa_finalize_work
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : ieee80211_ibss_csa_beacon+0x4e4/0x590 net/mac80211/ibss.c:503
lr : ieee80211_ibss_csa_beacon+0x4e4/0x590 net/mac80211/ibss.c:503
sp : ffff8000202c79c0
x29: ffff8000202c79d0 x28: 1fffe0001d43b251 x27: dfff800000000000
x26: 0000000000000000 x25: ffff0000ea1d9b08 x24: ffff0000dc8c05c0
x23: ffff0000ea1d9288 x22: ffff0000ea1d9b18 x21: 0000000000000002
x20: ffff0000ea1d8c80 x19: 0000000000000000 x18: 0000000000000201
x17: 0000000000000000 x16: ffff8000082c0bc8 x15: 0000000000000003
x14: 0000000000ff0100 x13: ffffffffffffffff x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : ffff800010afbff0
x8 : ffff0000db358000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000010
x2 : 0000000000000006 x1 : ffff80001131b080 x0 : 0000000000000000
Call trace:
 ieee80211_ibss_csa_beacon+0x4e4/0x590 net/mac80211/ibss.c:503
 ieee80211_ibss_finish_csa+0x228/0x314 net/mac80211/ibss.c:559
 ieee80211_set_after_csa_beacon net/mac80211/cfg.c:3188 [inline]
 __ieee80211_csa_finalize net/mac80211/cfg.c:3244 [inline]
 ieee80211_csa_finalize+0x3bc/0xcc4 net/mac80211/cfg.c:3267
 ieee80211_csa_finalize_work+0xdc/0x128 net/mac80211/cfg.c:3292
 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310
 worker_thread+0x8f4/0x101c kernel/workqueue.c:2457
 kthread+0x374/0x454 kernel/kthread.c:334
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855
irq event stamp: 99872
hardirqs last  enabled at (99871): [<ffff80000819dc64>] __local_bh_enable_ip+0x1f8/0x380 kernel/softirq.c:406
hardirqs last disabled at (99872): [<ffff8000111b7ff8>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (99870): [<ffff80001096c8dc>] spin_unlock_bh include/linux/spinlock.h:408 [inline]
softirqs last  enabled at (99870): [<ffff80001096c8dc>] cfg80211_get_bss+0x6d4/0xc68 net/wireless/scan.c:1547
softirqs last disabled at (99868): [<ffff80001096c328>] spin_lock_bh include/linux/spinlock.h:368 [inline]
softirqs last disabled at (99868): [<ffff80001096c328>] cfg80211_get_bss+0x120/0xc68 net/wireless/scan.c:1521
---[ end trace a183b04b81ef4e6f ]---
wlan1: failed to finalize CSA, disconnecting

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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.