syzbot


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: 1d04h, last: 1d04h
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 C error 4997 1010d 1879d 22/29 fixed on 2023/02/24 13:50
linux-5.15 WARNING in ieee80211_ibss_csa_beacon (3) -1 4 26d 127d 0/3 upstream: reported on 2025/07/26 04:50
linux-6.6 WARNING in ieee80211_ibss_csa_beacon -1 1 158d 158d 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 3 1d03h 12d 0/3 upstream: reported on 2025/11/18 07:37
linux-4.19 WARNING in ieee80211_ibss_csa_beacon -1 C error 1037 999d 1834d 0/1 upstream: reported C repro on 2020/11/22 05:50
linux-4.14 WARNING in ieee80211_ibss_csa_beacon -1 C 1 1016d 1848d 0/1 upstream: reported C repro on 2020/11/08 18:28
linux-5.15 WARNING in ieee80211_ibss_csa_beacon -1 504 387d 997d 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 227d 311d 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 672d 1006d 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 112d 998d 0/3 auto-obsoleted due to no activity on 2025/10/18 20:45

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 9126 at net/mac80211/ibss.c:501 ieee80211_ibss_csa_beacon+0x5bd/0x6a0 net/mac80211/ibss.c:501
Modules linked in:
CPU: 1 PID: 9126 Comm: kworker/u4:12 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:ieee80211_ibss_csa_beacon+0x5bd/0x6a0 net/mac80211/ibss.c:501
Code: f7 c6 05 0d 55 50 04 01 48 c7 c7 80 86 be 8b be fe 01 00 00 48 c7 c2 20 87 be 8b e8 1d e1 82 f7 e9 5f fe ff ff e8 73 c5 a0 f7 <0f> 0b b8 ea ff ff ff e9 7a ff ff ff e8 62 c5 a0 f7 0f 0b e9 b2 fa
RSP: 0018:ffffc900034372e0 EFLAGS: 00010287
RAX: ffffffff89e4db0d RBX: ffff888021468700 RCX: 0000000000100000
RDX: ffffc90017ddc000 RSI: 0000000000002417 RDI: 0000000000002418
RBP: 1ffff1100b85a2b3 R08: ffffffff90da95c7 R09: 1ffffffff21b52b8
R10: dffffc0000000000 R11: fffffbfff21b52b9 R12: ffffc900034374c0
R13: ffff88805c2d1598 R14: ffff88805c2d1a88 R15: ffff88805c2d0c80
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ed21ff8 CR3: 000000007539f000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 ieee80211_set_csa_beacon+0x77e/0xa10 net/mac80211/cfg.c:3836
 __ieee80211_channel_switch net/mac80211/cfg.c:3964 [inline]
 ieee80211_channel_switch+0x7c2/0xe30 net/mac80211/cfg.c:4009
 ieee80211_ibss_process_chanswitch+0x938/0xb60 net/mac80211/ibss.c:892
 ieee80211_rx_mgmt_spectrum_mgmt net/mac80211/ibss.c:931 [inline]
 ieee80211_ibss_rx_queued_mgmt+0xf98/0x2ac0 net/mac80211/ibss.c:1666
 ieee80211_iface_process_skb net/mac80211/iface.c:1651 [inline]
 ieee80211_iface_work+0x717/0xc70 net/mac80211/iface.c:1705
 cfg80211_wiphy_work+0x225/0x260 net/wireless/core.c:437
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 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 (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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.